Decrypt Function Equivalent in C#

Decrypt Function Equivalent in C# - c#

I have this function to decrypt connection strings in VB .NET, and I try to bring it to C#:
Function DecryptText(strText As String, ByVal strPwd As String)
Dim i As Integer, c As Integer
Dim strBuff As String
#If Not CASE_SENSITIVE_PASSWORD Then
'Convert password to upper case
'if not case-sensitive
strPwd = UCase$(strPwd)
#End If
'Decrypt string
If Len(strPwd) Then
For i = 1 To Len(strText)
c = Asc(Mid$(strText, i, 1))
c = c - Asc(Mid$(strPwd, (i Mod Len(strPwd)) + 1, 1))
strBuff = strBuff & Chr$(c & &HFF)
Next i
Else
strBuff = strText
End If
DecryptText = strBuff
End Function
I tried with these two ways:
public static string DesencriptarCadena(this string cadena, string llave = "asdf")
{
try
{
cadena = cadena.Replace("\r", "").Replace("\n", "");
byte b = 0;
string strBuff = "";
System.Text.Encoding encoding = System.Text.Encoding.Default;
for (int i = 0; i < cadena.Length; i++)
{
b = encoding.GetBytes(cadena.ToCharArray(), i, 1)[0];
int ind = i % llave.Length;
b -= encoding.GetBytes(llave.ToCharArray(), ind, 1)[0];
strBuff += encoding.GetChars(new byte[] { Convert.ToByte((int)b & +0xff) })[0];
}
return strBuff;
}
catch (Exception ex)
{
return cadena;
}
}
or this other way:
public static string DesencriptarCadena(this string cadena, string llave = "asdf")
{
try
{
cadena = cadena.Replace("\r", "").Replace("\n", "");
int c;
string strBuff = "";
System.Text.Encoding encoding = System.Text.Encoding.Default;
for (int i = 0; i < cadena.Length; i++)
{
int ind = i % llave.Length;
c = cadena[i];
c -= llave[ind];
strBuff += Convert.ToChar(c & +0xff);
}
return strBuff;
}
catch (Exception ex)
{
return cadena;
}
}
But, it doesn't work. Can someone explain to me what I should do?
In the first way return:
ÞÓÚÏË×ÞÓÚÏË×ÞÓÚÏ ÞÓÚÏË×ÞÓÚÏú×ÞÓÚÏË×ÞÓÚÏË×ÞÓÚÏË×ÞÚÏË×ÞÓÚÏË×Þ
In the second: NúÎCÄÁÎî
It is not returning the decrypted connection string.

http://converter.telerik.com has always done great by me for these types of conversions. Let me know how this works.
public object DecryptText(string strText, string strPwd)
{
int i = 0;
int c = 0;
string strBuff = null;
#if Not CASE_SENSITIVE_PASSWORD
//Convert password to upper case
//if not case-sensitive
strPwd = Strings.UCase(strPwd);
#endif
//Decrypt string
if (Strings.Len(strPwd)) {
for (i = 1; i <= Strings.Len(strText); i++) {
c = Strings.Asc(Strings.Mid(strText, i, 1));
c = c - Strings.Asc(Strings.Mid(strPwd, (i % Strings.Len(strPwd)) + 1, 1));
strBuff = strBuff + Strings.Chr(c + 0xff);
}
} else {
strBuff = strText;
}
return strBuff;
}

After including the Microsoft.VisualBasic assembly, I added two using statements:
using Microsoft.VisualBasic;
using Microsoft.VisualBasic.CompilerServices;
I compiled it and decompiled it with dotPeek. It resulted in this:
public static object DecryptText(string strText, string strPwd)
{
string str = string.Empty;
strPwd = Strings.UCase(strPwd);
if ((uint)Strings.Len(strPwd) > 0U)
{
int num1 = 1;
int num2 = Strings.Len(strText);
int Start = num1;
while (Start <= num2)
{
int num3 = checked(Strings.Asc(Strings.Mid(strText, Start, 1)) - Strings.Asc(Strings.Mid(strPwd, unchecked(Start % Strings.Len(strPwd)) + 1, 1)));
str = str + Conversions.ToString(Convert.ToChar(Conversions.ToString(num3) + Conversions.ToString((int)byte.MaxValue)));
checked { ++Start; }
}
}
else
str = strText;
return (object)str;
}

Related

string with quotes from database, cannot do interpolation

I have a problem with string in C#. I get this string from database, and it contains quote signs ("), so my program doesn't read it correctly.
string attributes = databaseFunctions.GetVariationAttributes(produc_id);
My string in the database is
a:3:{s:9:"variation";a:6:{s:4:"name";s:9:"Variation";s:5:"value";s:24:"type a | type b | type c";s:8:"position";s:1:"0";s:10:"is_visible";s:1:"1";s:12:"is_variation";s:1:"1";s:11:"is_taxonomy";s:1:"0";}s:5:"color";a:6:{s:4:"name";s:5:"Color";s:5:"value";s:27:"RED | BLUE | WHITE | ORANGE";s:8:"position";s:1:"1";s:10:"is_visible";s:1:"1";s:12:"is_variation";s:1:"1";s:11:"is_taxonomy";s:1:"0";}s:4:"test";a:6:{s:4:"name";s:4:"TEST";s:5:"value";s:15:"120 | 140 | 160";s:8:"position";s:1:"2";s:10:"is_visible";s:1:"1";s:12:"is_variation";s:1:"0";s:11:"is_taxonomy";s:1:"0";}}
This is actually the Woocommerce product variation attributes. I need to get each attribute, check if it is used for variations, and if yes, get its name and possible values.
Maybe you have any idea how to do it? I'm trying to use substrings and IndexOf functions (Get index of the first and second colon, then get value from between them and use it in a loop)
I will appreciate any of your advice
[EDIT]
Ok, I did it. It's not the prettiest solution, but it works. I post it here, so others may use it in a similar situation
if(databaseFunctions.CheckVariations(variations))
{
string attributes = databaseFunctions.GetVariationAttributes(produc_id);
List<List<string>> parameters = new List<List<string>>();
List<List<string>> values = new List<List<string>>();
int i_1 = 0;
int i_2 = 0;
//First ':'
int c_1 = attributes.IndexOf(':');
//Second ':'
int c_2 = attributes.IndexOf(':', c_1 + 1);
//First 'a' - number of attributes
int a_1 = Convert.ToInt32(attributes.Substring(c_1 + 1, c_2-c_1 -1));
//For each attribute
for (int i = 0; i < a_1; i++)
{
List<string> parameters_of_attribute = new List<string>();
List<string> values_of_attribute = new List<string>();
//First ':'
int ac_1 = attributes.IndexOf(':', c_2 + 1 + i_1);
//Second ':'
int ac_2 = attributes.IndexOf(':', ac_1 + 1);
//First ':' of a
int kc_1 = attributes.IndexOf(':', ac_2 + 1);
//Second ':' of a
int kc_2 = attributes.IndexOf(':', kc_1 + 1);
//Number of parameter-value pairs
int p_v = Convert.ToInt32(attributes.Substring(kc_1 + 1, kc_2 - kc_1 - 1));
//For each parameter-value pair
for (int j = 0; j < p_v; j++)
{
//First '"' of parameter
int pq_1 = attributes.IndexOf('"', kc_2 + 1 + i_2);
//Second '"' of parameter
int pq_2 = attributes.IndexOf('"', pq_1 + 1);
//Name of parameter
string par = attributes.Substring(pq_1 + 1, pq_2 - pq_1 - 1);
//First '"' of value
int vq_1 = attributes.IndexOf('"', pq_2 + 1);
//Second '"' of value
int vq_2 = attributes.IndexOf('"', vq_1 + 1);
//Value of parameter
string val = attributes.Substring(vq_1 + 1, vq_2 - vq_1 - 1);
parameters_of_attribute.Add(par);
values_of_attribute.Add(val);
i_2 = vq_2 - kc_2;
}
parameters.Add(parameters_of_attribute);
values.Add(values_of_attribute);
i_1 = i_2 + kc_2 - c_2;
i_2 = 0;
}
}

Gordon Breuer published code to read PHP's serialized data format using C# at https://gordon-breuer.de/unknown/2011/05/04/php-un-serialize-with-c.html - unfortunately this is not available as a NuGet package (yet!) - it's based off dinosaur code written for .NET Framework 1.0 back in 2001.
I'm repeating the code below for preservation's sake with extra copyright/origin info (Blogs aren't around forever). According to the original SourceForge project's page the code is licensed under the OSI-approved IBM CPL.
/*
* Serializer.cs
* This is the Serializer class for the PHPSerializationLibrary
*
* https://sourceforge.net/projects/csphpserial/
*
* Copyright 2004 Conversive, Inc. Licensed under Common Public License 1.0
*
* Modified for WP7-Silverlight by Gordon Breuer
* https://gordon-breuer.de/unknown/2011/05/04/php-un-serialize-with-c.html
*
* Updated to be thread-safe and correctly reentrant and with C# 7.0 features added for https://stackoverflow.com/questions/58384540/c-sharp-string-with-from-database-cannot-do-interpolation/
*
*/
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
namespace Conversive.PHPSerializationLibrary {
public class PhpSerializer
{
//types:
// N = null
// s = string
// i = int
// d = double
// a = array (hashtable)
private static readonly NumberFormatInfo _nfi = new NumberFormatInfo { NumberGroupSeparator = "", NumberDecimalSeparator = "." };
public Encoding StringEncoding { get; }
/// <summary>Whether or not to strip carriage returns from strings when serializing and adding them back in when deserializing</summary>
public Boolean XmlSafe { get; }
public PhpSerializer()
: this( encoding: new UTF8Encoding(), xmlSafe: true )
{
}
public PhpSerializer( Encoding encoding, Boolean xmlSafe )
{
this.StringEncoding = encoding ?? throw new ArgumentNullException(nameof(encoding));
this.XmlSafe = xmlSafe;
}
private class SerializeState
{
public readonly StringBuilder sb = new StringBuilder();
// These collections used for cycle-detection.
public readonly HashSet<Object> seenCollections = new HashSet<Object>();
}
public String Serialize(object obj)
{
SerializeState state = new SerializeState();
this.Serialize(obj, state );
return state.sb.ToString();
}
//Serialize(object obj)
private void Serialize( Object obj, SerializeState state )
{
StringBuilder sb = state.sb;
if (obj == null)
{
sb.Append("N;");
}
else if (obj is string str)
{
if (XmlSafe)
{
str = str.Replace("rn", "n"); //replace rn with n
str = str.Replace("r", "n"); //replace r not followed by n with a single n Should we do this?
}
sb.Append("s:" + StringEncoding.GetByteCount(str) + ":" + str + ";");
}
else if (obj is bool b)
{
sb.Append("b:" + ( b ? "1" : "0") + ";");
}
else if (obj is int objInt)
{
sb.Append("i:" + objInt.ToString(_nfi) + ";");
}
else if (obj is double objDbl)
{
sb.Append("d:" + objDbl.ToString(_nfi) + ";");
}
else if ( (obj is IReadOnlyDictionary<object, object> ) || ( obj is IDictionary<object, object> ) )
{
if (state.seenCollections.Contains(obj))
{
sb.Append("N;");
}
else
{
state.seenCollections.Add(obj);
IEnumerable<KeyValuePair<Object,Object>> asDictEnum = (IEnumerable<KeyValuePair<Object,Object>>)obj;
sb.Append("a:" + asDictEnum.Count() + ":{");
foreach (var entry in asDictEnum)
{
this.Serialize(entry.Key, state);
this.Serialize(entry.Value, state);
}
sb.Append("}");
}
}
else if (obj is IEnumerable<object> enumerable)
{
if (state.seenCollections.Contains( enumerable ) )
{
sb.Append("N;");
}
else
{
state.seenCollections.Add(enumerable);
IReadOnlyList<Object> asList = enumerable as IReadOnlyList<Object>; // T[] / Array<T> implements IReadOnlyList<T> already.
if( asList == null ) asList = enumerable.ToList();
sb.Append("a:" + asList.Count + ":{");
Int32 i = 0;
foreach( Object item in asList )
{
this.Serialize(i, state);
this.Serialize( item, state);
i++;
}
sb.Append("}");
}
}
else
{
throw new SerializationException( "Value could not be serialized." );
}
}
public Object Deserialize(String str)
{
Int32 pos = 0;
return this.Deserialize(str, ref pos );
}
private Object Deserialize( String str, ref Int32 pos )
{
if( String.IsNullOrWhiteSpace( str ) )
return new Object();
int start, end, length;
string stLen;
switch( str[pos] )
{
case 'N':
pos += 2;
return null;
case 'b':
char chBool = str[pos + 2];
pos += 4;
return chBool == '1';
case 'i':
start = str.IndexOf(":", pos) + 1;
end = str.IndexOf(";", start);
var stInt = str.Substring(start, end - start);
pos += 3 + stInt.Length;
return Int32.Parse(stInt, _nfi);
case 'd':
start = str.IndexOf(":", pos) + 1;
end = str.IndexOf(";", start);
var stDouble = str.Substring(start, end - start);
pos += 3 + stDouble.Length;
return Double.Parse(stDouble, _nfi);
case 's':
start = str.IndexOf(":", pos) + 1;
end = str.IndexOf(":", start);
stLen = str.Substring(start, end - start);
var bytelen = Int32.Parse(stLen);
length = bytelen;
if ((end + 2 + length) >= str.Length) length = str.Length - 2 - end;
var stRet = str.Substring(end + 2, length);
while (StringEncoding.GetByteCount(stRet) > bytelen)
{
length--;
stRet = str.Substring(end + 2, length);
}
pos += 6 + stLen.Length + length;
if (XmlSafe) stRet = stRet.Replace("n", "rn");
return stRet;
case 'a':
start = str.IndexOf(":", pos) + 1;
end = str.IndexOf(":", start);
stLen = str.Substring(start, end - start);
length = Int32.Parse(stLen);
var htRet = new Dictionary<object, object>(length);
var alRet = new List<object>(length);
pos += 4 + stLen.Length; //a:Len:{
for (int i = 0; i < length; i++)
{
var key = this.Deserialize(str, ref pos);
var val = this.Deserialize(str, ref pos);
if (alRet != null)
{
if (key is int && (int)key == alRet.Count)
alRet.Add(val);
else
alRet = null;
}
htRet[key] = val;
}
pos++;
if( pos < str.Length && str[pos] == ';')
{
pos++;
}
return alRet != null ? (object)alRet : htRet;
default:
return "";
}
}
}
}
When I run this in Linqpad with your input I get this result output:
void Main()
{
const String attribs = #"a:3:{s:9:""variation"";a:6:{s:4:""name"";s:9:""Variation"";s:5:""value"";s:24:""type a | type b | type c"";s:8:""position"";s:1:""0"";s:10:""is_visible"";s:1:""1"";s:12:""is_variation"";s:1:""1"";s:11:""is_taxonomy"";s:1:""0"";}s:5:""color"";a:6:{s:4:""name"";s:5:""Color"";s:5:""value"";s:27:""RED | BLUE | WHITE | ORANGE"";s:8:""position"";s:1:""1"";s:10:""is_visible"";s:1:""1"";s:12:""is_variation"";s:1:""1"";s:11:""is_taxonomy"";s:1:""0"";}s:4:""test"";a:6:{s:4:""name"";s:4:""TEST"";s:5:""value"";s:15:""120 | 140 | 160"";s:8:""position"";s:1:""2"";s:10:""is_visible"";s:1:""1"";s:12:""is_variation"";s:1:""0"";s:11:""is_taxonomy"";s:1:""0"";}}";
PhpSerializer s = new PhpSerializer();
Object result = s.Deserialize( attribs );
result.Dump();
}
Visualized output:

i am trying to convert this function in c# plase help me

Public Function Encrypt(ByRef PassStr As String) As String
Dim Pos, StrLen, i, iValue As Short
Dim RetValue As String
iValue = 100
StrLen = Len(PassStr)
RetValue = ""
For i = 1 To StrLen
Pos = Asc(Mid(PassStr, i, 1)) + (iValue + i)
RetValue = RetValue & Chr(Pos)
Next
Encrypt = RetValue
End Function
In my C# code this is where I am wrong in for loop.. in C#
public static string Encryptpwd(string password)
{
try
{
// byte[] encData_byte = new byte[password.Length];
// encData_byte = System.Text.Encoding.UTF8.GetBytes(password);
// string encodedData = Convert.ToBase64String(encData_byte);
// return encodedData;
//for (init; condition; increment)
//{
// statement(s);
//}
/// <param name="s"> String to Check.</param>
/// <param name="a">Position of Character</param>
/// <param name="b">Length </param>
int Pos = 0, i = 0, iValue = 0;
string RetValue = string.Empty;
iValue = 100;
RetValue = "";
int StrLen = password.Length;
for (i = 1; Mid(password,i,10); iValue +i; )
{
Console.WriteLine("value of a: {0}", Pos);
}
return password;
}
catch (Exception ex)
{
throw new Exception("Error in Encryptpwd" + ex.Message);
}
}
public static string Mid(string s, int a, int b)
{
string temp = s.Substring(a - 1, b);
return temp;
}

You can use the following from converter.telerik.com
public string Encrypt(ref string passStr)
{
int pos, strLen, i, iValue;
string returnValue;
iValue = 100;
strLen = passStr.Length;
returnValue = "";
for (i = 1; i <= strLen; i++)
{
pos = ((int)(Convert.ToChar(passStr.Substring(i, 1))) + (iValue + i));
returnValue = returnValue + passStr[pos];
}
return returnValue;
}

Hello you can use Online Vb to c# converter.
like this link : http://converter.telerik.com/
public string Encrypt(ref string PassStr)
{
short Pos, StrLen, i, iValue;
string RetValue;
iValue = 100;
StrLen = Strings.Len(PassStr);
RetValue = "";
for (i = 1; i <= StrLen; i++)
{
Pos = Strings.Asc(Strings.Mid(PassStr, i, 1)) + (iValue + i);
RetValue = RetValue + Strings.Chr(Pos);
}
Encrypt = RetValue;
}

c# regex replace all patterns with different strings

ok so basically i translated this xor converter from javascript so i can xor strings faster by c+p my c++ code and it just replaces all the strings with xor'd ones for me, but this xors all strings with the first xor it created for the first string any help with this would be greatly appreciated. i tried creating a loop but i just failed and gave up. that is probably what i need to do i just need someone to show me how i should set it up.
string Dec2Hex(int test)
{
string hex = test.ToString("X");
return hex;
}
string symbols = " !\"#$%&'()*+,-./0123456789:;<=>?#";
int toAscii(string xx)
{
var loAZ = "abcdefghijklmnopqrstuvwxyz";
symbols += loAZ.ToUpper();
symbols += "[\\]^_`";
symbols += loAZ;
symbols += "{|}~";
int loc;
loc = symbols.IndexOf(xx);
if (loc > -1)
{
//Ascii_Decimal = 32 + loc;
return (32 + loc);
}
return (0); // If not in range 32-126 return ZERO
}
byte[] randByte()
{
Byte[] RandByte = new Byte[5];
new Random().NextBytes(RandByte);
return RandByte;
}
public void RunEncrypter()
{
string test = textBox1.Text;
System.Text.RegularExpressions.Regex x = new System.Text.RegularExpressions.Regex("\"(.*?)\"", System.Text.RegularExpressions.RegexOptions.Singleline);
var matches = x.Matches(textBox1.Text);
string s1 = "";
if (matches.Count <= 0)
return;
s1 = matches[0].Groups[1].Value;
byte[] randombyte = randByte();
double xvaluestart = randombyte[0];
string xrefkill = "0x" + Dec2Hex(randombyte[1]) + Dec2Hex(randombyte[2]) + Dec2Hex(randombyte[3]) + Dec2Hex(randombyte[4]);
int finallen = s1.Length + 1;
string hexsequence = "\"";
double xvalue = xvaluestart;
for (int i = 0; i < s1.Length; i++)
{
string ch = s1.Substring(i, 1);
int chval;
chval = toAscii(ch);
if (chval == 0) { s1 = "invalid character: " + ch; return; }
chval ^= (int)xvalue;
xvalue += 1;
xvalue %= 256;
hexsequence += "\\x" + Dec2Hex(chval);
}
hexsequence += '"';
string s2 = "/*" + s1 + "*/XorStr<0x" + Dec2Hex((int)xvaluestart) + "," + finallen + "," + xrefkill + ">(";
s2 += hexsequence + "+" + xrefkill + ").s";
textBox1.Text = x.Replace(textBox1.Text, s2);
}
private void button1_Click(object sender, EventArgs e)
{
RunEncrypter();
}

I do not fully understand what you are trying but a simple XOR cipher can be implemented in C# as simple as that:
static string Xor(string text, int key)
{
string result = "";
for (int i = 0; i < text.Length; i++)
{
int charValue = Convert.ToInt32(text[i]); //get the ASCII value of the character
charValue ^= key; //xor the value
result += char.ConvertFromUtf32(charValue); //convert back to string
}
return result;
}
This algorithm goes through each character in the string, convert it to its integer ASCII value, xor the value with the key, and convert the new value back into a string.

C# Function to translate Binary-Code

Right now I try to write a C# Program to translate 8 Base Binary into Text.
But I guess I am not experienced enough with C# to truly make it Work.
I think the code I come up with, should, from a logical Point-of-View somewhat do what I want, but the Syntax isn't properly doing it, since don´t know it better.
This is what I have so far:
using System;
using System.Linq;
using System.Text;
class binaryTranslate
{
public int convertBin(string CodeInput)
{
int [] code = CodeInput.ToArray();
int CodeCount = code.ToString().Length;
int EightBaseSegAmount = CodeCount / 8;
int ByteCapacity = 8;
StringBuilder translated = new StringBuilder();
for (var i = 1; i < EightBaseSegAmount + 1; i++)
{
StringBuilder Byte = new StringBuilder(ByteCapacity);
int ByteStart = (i * 8) - 8;
int ByteEnd = (i * 8) - 1;
int ByteIncrement = 1;
for (var j = ByteStart ; j < ByteEnd + 1; j++)
{
Byte.Append(code[j]);
}
for (var k = 0; k > 7; k++)
{
int BitValue = 128;
if (Byte[k] == 1)
{
if (k > 0)
{
int Squared = Math.Pow(2, k);
ByteIncrement += BitValue / Squared;
}
else
{
ByteIncrement += BitValue;
}
}
}
char toSymbol = Convert.ToChar(ByteIncrement);
translated.Append(toSymbol);
}
return translated;
}
public static int Main()
{
convertBin("010010000110000101101100011011000110111100100001");
}
}

First of all, your code won't compile. Here are the errors/mistakes.
The first one is, at the first line of your function, you are converting the input string to an array using String.ToArray(), which returns a char[] but your try to assign it to a variable (code) typed int[]. You can solve this by replacing the int[] with either char[] or var.
The second one is, inside the second for loop (k = 0; k > 7), you use Math.Pow() and assign it's return value to an int variable (Squared). But Math.Pow returns double. You can solve this by casting the return value of Math.Pow to int. Like; int Squared = (int)Math.Pow(2, k);
The last thing is not easily solvable like the first two because, your code is not exactly correct. You are trying to return something called translated, which is a variable of type StringBuilder. But your function is defined to return an int.
Now these were compile errors. There are a bunch of logical and decision errors/mistakes. Your algorithm also isn't very correct.
Here is a sample code you can use/examine. I'd like to help you further, why your code was incorrect, what was your design mistakes etc. if you want to.
class binaryTranslate
{
public enum IncompleteSegmentBehavior
{
Skip = 0,
ZerosToStart = 1,
ZerosToEnd = 2
}
private byte ConvertBinstrToByte(string sequence)
{
if (string.IsNullOrEmpty(sequence))
return 0; // Throw?
if (sequence.Length != sizeof(byte) * 8)
return 0; // Throw?
const char zero = '0';
const char one = '1';
byte value = 0;
for (int i = 0; i < sequence.Length; i++)
{
if (sequence[i] != zero && sequence[i] != one)
return 0; // Throw
value |= (byte)((sequence[i] - zero) << (7 - i));
}
return value;
}
private string HandleIncompleteSegment(string segment, int segmentSize, IncompleteSegmentBehavior behavior)
{
string result = null;
var zeroAppender = new StringBuilder();
for (int i = 0; i < segmentSize - segment.Length; i++)
zeroAppender.Append('0');
var zeros = zeroAppender.ToString();
switch (behavior)
{
case IncompleteSegmentBehavior.Skip:
break;
case IncompleteSegmentBehavior.ZerosToStart:
result = zeros + result;
break;
case IncompleteSegmentBehavior.ZerosToEnd:
result = result + zeros;
break;
default:
break;
}
return result;
}
public byte[] ConvertBinstrToBytes(string binarySequence, IncompleteSegmentBehavior behavior = IncompleteSegmentBehavior.Skip)
{
var segmentSize = sizeof(byte) * 8;
var sequenceLength = binarySequence.Length;
var numberOfBytes = (int)Math.Ceiling((double)sequenceLength / segmentSize);
var bytes = new byte[numberOfBytes];
for (int i = 0; i < numberOfBytes; i++)
{
var charactersLeft = sequenceLength - i * segmentSize;
var segmentLength = (charactersLeft < segmentSize ? charactersLeft : segmentSize);
var segment = binarySequence.Substring(i * segmentSize, segmentLength);
if (charactersLeft < segmentSize)
{
segment = HandleIncompleteSegment(segment, segmentSize, behavior);
if (segment == null)
continue;
}
bytes[i] = ConvertBinstrToByte(segment);
}
return bytes;
}
}
This code passes these assertions.
var bytes = new binaryTranslate()
.ConvertBinstrToBytes("00000000");
Assert.Equal(bytes.Length, 1);
Assert.Equal(bytes[0], 0b00000000);
bytes = new binaryTranslate()
.ConvertBinstrToBytes("10000000");
Assert.Equal(bytes.Length, 1);
Assert.Equal(bytes[0], 0b10000000);
bytes = new binaryTranslate()
.ConvertBinstrToBytes("11111111");
Assert.Equal(bytes.Length, 1);
Assert.Equal(bytes[0], 0b11111111);
bytes = new binaryTranslate()
.ConvertBinstrToBytes("00000001");
Assert.Equal(bytes.Length, 1);
Assert.Equal(bytes[0], 0b00000001);
bytes = new binaryTranslate()
.ConvertBinstrToBytes("1100110000110011");
Assert.Equal(bytes.Length, 2);
Assert.Equal(bytes[0], 0b11001100);
Assert.Equal(bytes[1], 0b00110011);

If you are really converting to a string the code should look like this
namespace binaryTranslate
{
class Program
{
static void Main(string[] args)
{
//convertBin("01001000 01100001 01101100 01101100 01101111 00100001");
string results = BinaryTranslate.convertBin(new byte[] { 0x44, 0x61, 0x6c, 0x6c, 0x6f, 0x21 });
}
}
public class BinaryTranslate
{
public static string convertBin(byte[] CodeInput)
{
return string.Join("", CodeInput.Select(x => x.ToString("X2")));
}
}
}

this should do the trick.
public static string FromBinary(string binary)
{
int WordLength = 8;
binary = binary.Replace(' ', '');
while(binary.Length % WordLength != 0)
binary += "0";
string output = String.Empty;
string word = String.Empty;
int offset = 0;
while(offset < binary.Length)
{
int tmp = 0;
word = binary.Substring(offset, 8);
for(int i=0; i<(WordLength - 1); i++)
if(word[i] == '1')
tmp += (int) Math.Pow(2, i);
output += Convert.ToChar(tmp);
offset += WordLength;
}
return output;
}

Convert integer to binary in C#

How to convert an integer number into its binary representation?
I'm using this code:
String input = "8";
String output = Convert.ToInt32(input, 2).ToString();
But it throws an exception:
Could not find any parsable digits

Your example has an integer expressed as a string. Let's say your integer was actually an integer, and you want to take the integer and convert it to a binary string.
int value = 8;
string binary = Convert.ToString(value, 2);
Which returns 1000.

Convert from any classic base to any base in C#
string number = "100";
int fromBase = 16;
int toBase = 10;
string result = Convert.ToString(Convert.ToInt32(number, fromBase), toBase);
// result == "256"
Supported bases are 2, 8, 10 and 16

Very Simple with no extra code, just input, conversion and output.
using System;
namespace _01.Decimal_to_Binary
{
class DecimalToBinary
{
static void Main(string[] args)
{
Console.Write("Decimal: ");
int decimalNumber = int.Parse(Console.ReadLine());
int remainder;
string result = string.Empty;
while (decimalNumber > 0)
{
remainder = decimalNumber % 2;
decimalNumber /= 2;
result = remainder.ToString() + result;
}
Console.WriteLine("Binary: {0}",result);
}
}
}

http://zamirsblog.blogspot.com/2011/10/convert-decimal-to-binary-in-c.html
public string DecimalToBinary(string data)
{
string result = string.Empty;
int rem = 0;
try
{
if (!IsNumeric(data))
error = "Invalid Value - This is not a numeric value";
else
{
int num = int.Parse(data);
while (num > 0)
{
rem = num % 2;
num = num / 2;
result = rem.ToString() + result;
}
}
}
catch (Exception ex)
{
error = ex.Message;
}
return result;
}

primitive way:
public string ToBinary(int n)
{
if (n < 2) return n.ToString();
var divisor = n / 2;
var remainder = n % 2;
return ToBinary(divisor) + remainder;
}

Another alternative but also inline solution using Enumerable and LINQ is:
int number = 25;
string binary = Enumerable.Range(0, (int)Math.Log(number, 2) + 1).Aggregate(string.Empty, (collected, bitshifts) => ((number >> bitshifts) & 1 ) + collected);

Convert.ToInt32(string, base) does not do base conversion into your base. It assumes that the string contains a valid number in the indicated base, and converts to base 10.
So you're getting an error because "8" is not a valid digit in base 2.
String str = "1111";
String Ans = Convert.ToInt32(str, 2).ToString();
Will show 15 (1111 base 2 = 15 base 10)
String str = "f000";
String Ans = Convert.ToInt32(str, 16).ToString();
Will show 61440.

static void convertToBinary(int n)
{
Stack<int> stack = new Stack<int>();
stack.Push(n);
// step 1 : Push the element on the stack
while (n > 1)
{
n = n / 2;
stack.Push(n);
}
// step 2 : Pop the element and print the value
foreach(var val in stack)
{
Console.Write(val % 2);
}
}

I know this answer would look similar to most of the answers already here, but I noticed just about none of them uses a for-loop. This code works, and can be considered simple, in the sense it will work without any special functions, like a ToString() with parameters, and is not too long as well. Maybe some prefer for-loops instead of just while-loop, this may be suitable for them.
public static string ByteConvert (int num)
{
int[] p = new int[8];
string pa = "";
for (int ii = 0; ii<= 7;ii = ii +1)
{
p[7-ii] = num%2;
num = num/2;
}
for (int ii = 0;ii <= 7; ii = ii + 1)
{
pa += p[ii].ToString();
}
return pa;
}

using System;
class Program
{
static void Main(string[] args) {
try {
int i = (int) Convert.ToInt64(args[0]);
Console.WriteLine("\n{0} converted to Binary is {1}\n", i, ToBinary(i));
} catch(Exception e) {
Console.WriteLine("\n{0}\n", e.Message);
}
}
public static string ToBinary(Int64 Decimal) {
// Declare a few variables we're going to need
Int64 BinaryHolder;
char[] BinaryArray;
string BinaryResult = "";
while (Decimal > 0) {
BinaryHolder = Decimal % 2;
BinaryResult += BinaryHolder;
Decimal = Decimal / 2;
}
BinaryArray = BinaryResult.ToCharArray();
Array.Reverse(BinaryArray);
BinaryResult = new string(BinaryArray);
return BinaryResult;
}
}

This function will convert integer to binary in C#:
public static string ToBinary(int N)
{
int d = N;
int q = -1;
int r = -1;
string binNumber = string.Empty;
while (q != 1)
{
r = d % 2;
q = d / 2;
d = q;
binNumber = r.ToString() + binNumber;
}
binNumber = q.ToString() + binNumber;
return binNumber;
}

class Program
{
static void Main(string[] args)
{
var #decimal = 42;
var binaryVal = ToBinary(#decimal, 2);
var binary = "101010";
var decimalVal = ToDecimal(binary, 2);
Console.WriteLine("Binary value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of binary '{0}' is {1}", binary, decimalVal);
Console.WriteLine();
#decimal = 6;
binaryVal = ToBinary(#decimal, 3);
binary = "20";
decimalVal = ToDecimal(binary, 3);
Console.WriteLine("Base3 value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of base3 '{0}' is {1}", binary, decimalVal);
Console.WriteLine();
#decimal = 47;
binaryVal = ToBinary(#decimal, 4);
binary = "233";
decimalVal = ToDecimal(binary, 4);
Console.WriteLine("Base4 value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of base4 '{0}' is {1}", binary, decimalVal);
Console.WriteLine();
#decimal = 99;
binaryVal = ToBinary(#decimal, 5);
binary = "344";
decimalVal = ToDecimal(binary, 5);
Console.WriteLine("Base5 value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of base5 '{0}' is {1}", binary, decimalVal);
Console.WriteLine();
Console.WriteLine("And so forth.. excluding after base 10 (decimal) though :)");
Console.WriteLine();
#decimal = 16;
binaryVal = ToBinary(#decimal, 11);
binary = "b";
decimalVal = ToDecimal(binary, 11);
Console.WriteLine("Hexidecimal value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of Hexidecimal '{0}' is {1}", binary, decimalVal);
Console.WriteLine();
Console.WriteLine("Uh oh.. this aint right :( ... but let's cheat :P");
Console.WriteLine();
#decimal = 11;
binaryVal = Convert.ToString(#decimal, 16);
binary = "b";
decimalVal = Convert.ToInt32(binary, 16);
Console.WriteLine("Hexidecimal value of decimal {0} is '{1}'", #decimal, binaryVal);
Console.WriteLine("Decimal value of Hexidecimal '{0}' is {1}", binary, decimalVal);
Console.ReadLine();
}
static string ToBinary(decimal number, int #base)
{
var round = 0;
var reverseBinary = string.Empty;
while (number > 0)
{
var remainder = number % #base;
reverseBinary += remainder;
round = (int)(number / #base);
number = round;
}
var binaryArray = reverseBinary.ToCharArray();
Array.Reverse(binaryArray);
var binary = new string(binaryArray);
return binary;
}
static double ToDecimal(string binary, int #base)
{
var val = 0d;
if (!binary.All(char.IsNumber))
return 0d;
for (int i = 0; i < binary.Length; i++)
{
var #char = Convert.ToDouble(binary[i].ToString());
var pow = (binary.Length - 1) - i;
val += Math.Pow(#base, pow) * #char;
}
return val;
}
}
Learning sources:
Everything you need to know about binary
including algorithm to convert decimal to binary

class Program{
static void Main(string[] args){
try{
int i = (int)Convert.ToInt64(args[0]);
Console.WriteLine("\n{0} converted to Binary is {1}\n",i,ToBinary(i));
}catch(Exception e){
Console.WriteLine("\n{0}\n",e.Message);
}
}//end Main
public static string ToBinary(Int64 Decimal)
{
// Declare a few variables we're going to need
Int64 BinaryHolder;
char[] BinaryArray;
string BinaryResult = "";
while (Decimal > 0)
{
BinaryHolder = Decimal % 2;
BinaryResult += BinaryHolder;
Decimal = Decimal / 2;
}
// The algoritm gives us the binary number in reverse order (mirrored)
// We store it in an array so that we can reverse it back to normal
BinaryArray = BinaryResult.ToCharArray();
Array.Reverse(BinaryArray);
BinaryResult = new string(BinaryArray);
return BinaryResult;
}
}//end class Program

BCL provided Convert.ToString(n, 2) is good, but in case you need an alternate implementation which is few ticks faster than BCL provided one.
Following custom implementation works for all integers(-ve and +ve).
Original source taken from https://davidsekar.com/algorithms/csharp-program-to-convert-decimal-to-binary
static string ToBinary(int n)
{
int j = 0;
char[] output = new char[32];
if (n == 0)
output[j++] = '0';
else
{
int checkBit = 1 << 30;
bool skipInitialZeros = true;
// Check the sign bit separately, as 1<<31 will cause
// +ve integer overflow
if ((n & int.MinValue) == int.MinValue)
{
output[j++] = '1';
skipInitialZeros = false;
}
for (int i = 0; i < 31; i++, checkBit >>= 1)
{
if ((n & checkBit) == 0)
{
if (skipInitialZeros)
continue;
else
output[j++] = '0';
}
else
{
skipInitialZeros = false;
output[j++] = '1';
}
}
}
return new string(output, 0, j);
}
Above code is my implementation. So, I'm eager to hear any feedback :)

// I use this function
public static string ToBinary(long number)
{
string digit = Convert.ToString(number % 2);
if (number >= 2)
{
long remaining = number / 2;
string remainingString = ToBinary(remaining);
return remainingString + digit;
}
return digit;
}

static void Main(string[] args)
{
Console.WriteLine("Enter number for converting to binary numerical system!");
int num = Convert.ToInt32(Console.ReadLine());
int[] arr = new int[16];
//for positive integers
if (num > 0)
{
for (int i = 0; i < 16; i++)
{
if (num > 0)
{
if ((num % 2) == 0)
{
num = num / 2;
arr[16 - (i + 1)] = 0;
}
else if ((num % 2) != 0)
{
num = num / 2;
arr[16 - (i + 1)] = 1;
}
}
}
for (int y = 0; y < 16; y++)
{
Console.Write(arr[y]);
}
Console.ReadLine();
}
//for negative integers
else if (num < 0)
{
num = (num + 1) * -1;
for (int i = 0; i < 16; i++)
{
if (num > 0)
{
if ((num % 2) == 0)
{
num = num / 2;
arr[16 - (i + 1)] = 0;
}
else if ((num % 2) != 0)
{
num = num / 2;
arr[16 - (i + 1)] = 1;
}
}
}
for (int y = 0; y < 16; y++)
{
if (arr[y] != 0)
{
arr[y] = 0;
}
else
{
arr[y] = 1;
}
Console.Write(arr[y]);
}
Console.ReadLine();
}
}

This might be helpful if you want a concise function that you can call from your main method, inside your class. You may still need to call int.Parse(toBinary(someint)) if you require a number instead of a string but I find this method work pretty well. Additionally, this can be adjusted to use a for loop instead of a do-while if you'd prefer.
public static string toBinary(int base10)
{
string binary = "";
do {
binary = (base10 % 2) + binary;
base10 /= 2;
}
while (base10 > 0);
return binary;
}
toBinary(10) returns the string "1010".

I came across this problem in a coding challenge where you have to convert 32 digit decimal to binary and find the possible combination of the substring.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Numerics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp2
{
class Program
{
public static void Main()
{
int numberofinputs = int.Parse(Console.ReadLine());
List<BigInteger> inputdecimal = new List<BigInteger>();
List<string> outputBinary = new List<string>();
for (int i = 0; i < numberofinputs; i++)
{
inputdecimal.Add(BigInteger.Parse(Console.ReadLine(), CultureInfo.InvariantCulture));
}
//processing begins
foreach (var n in inputdecimal)
{
string binary = (binaryconveter(n));
subString(binary, binary.Length);
}
foreach (var item in outputBinary)
{
Console.WriteLine(item);
}
string binaryconveter(BigInteger n)
{
int i;
StringBuilder output = new StringBuilder();
for (i = 0; n > 0; i++)
{
output = output.Append(n % 2);
n = n / 2;
}
return output.ToString();
}
void subString(string str, int n)
{
int zeroodds = 0;
int oneodds = 0;
for (int len = 1; len <= n; len++)
{
for (int i = 0; i <= n - len; i++)
{
int j = i + len - 1;
string substring = "";
for (int k = i; k <= j; k++)
{
substring = String.Concat(substring, str[k]);
}
var resultofstringanalysis = stringanalysis(substring);
if (resultofstringanalysis.Equals("both are odd"))
{
++zeroodds;
++oneodds;
}
else if (resultofstringanalysis.Equals("zeroes are odd"))
{
++zeroodds;
}
else if (resultofstringanalysis.Equals("ones are odd"))
{
++oneodds;
}
}
}
string outputtest = String.Concat(zeroodds.ToString(), ' ', oneodds.ToString());
outputBinary.Add(outputtest);
}
string stringanalysis(string str)
{
int n = str.Length;
int nofZeros = 0;
int nofOnes = 0;
for (int i = 0; i < n; i++)
{
if (str[i] == '0')
{
++nofZeros;
}
if (str[i] == '1')
{
++nofOnes;
}
}
if ((nofZeros != 0 && nofZeros % 2 != 0) && (nofOnes != 0 && nofOnes % 2 != 0))
{
return "both are odd";
}
else if (nofZeros != 0 && nofZeros % 2 != 0)
{
return "zeroes are odd";
}
else if (nofOnes != 0 && nofOnes % 2 != 0)
{
return "ones are odd";
}
else
{
return "nothing";
}
}
Console.ReadKey();
}
}
}

int x=550;
string s=" ";
string y=" ";
while (x>0)
{
s += x%2;
x=x/2;
}
Console.WriteLine(Reverse(s));
}
public static string Reverse( string s )
{
char[] charArray = s.ToCharArray();
Array.Reverse( charArray );
return new string( charArray );
}

This was a interesting read i was looking for a quick copy paste.
I knew i had done this before long ago with bitmath differently.
Here was my take on it.
// i had this as a extension method in a static class (this int inValue);
public static string ToBinaryString(int inValue)
{
string result = "";
for (int bitIndexToTest = 0; bitIndexToTest < 32; bitIndexToTest++)
result += ((inValue & (1 << (bitIndexToTest))) > 0) ? '1' : '0';
return result;
}
You could stick spacing in there with a bit of modulos in the loop.
// little bit of spacing
if (((bitIndexToTest + 1) % spaceEvery) == 0)
result += ' ';
You could probably use or pass in a stringbuilder and append or index directly to avoid deallocations and also get around the use of += this way;

var b = Convert.ToString(i,2).PadLeft(32,'0').ToCharArray().Reverse().ToArray();

Just one line for 8 bit
Console.WriteLine(Convert.ToString(n, 2).PadLeft(8, '0'));
where n is the number

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