Develop Reference

String can't be parsed into UInt32

I am programming a Login for users in Unity. I have 2 "Text Mesh Pro UGUI" input fields for a username and a password.
I need to convert the username (which is a number) into an UInt32 to handle the Login of the User.
But there is a Problem with this simple string → UInt32 parsing.
This is the code:
// Note: I have tried typing different Numbers into the input field but in this case,
// I have tried the same as the test_string (123456)
// This works perfect
string test_string = "123456";
UInt32 test_UInt32 = 0;
if (UInt32.TryParse(test_string, out test_UInt32))
{
test_UInt32 = UInt32.Parse(test_string);
}
// This never works
UInt32 username_UInt32 = 0;
if (UInt32.TryParse(username.text, out username_UInt32))
{
username_UInt32 = UInt32.Parse(username.text);
}
// Debugging for me to find the error
Debug.Log(username.text); // Output: 123456
Debug.Log(test_string); // Output: 123456
Debug.Log(username.text.GetType().ToString()); // Output: System.String
Debug.Log(test_string.GetType().ToString()); // Output: System.String
Debug.Log(username.text.Length.ToString()); // Output: 7
Debug.Log(test_string.Length.ToString()); // Output: 6
// For Testing only => FormatException: Input string was not in a correct format.
username_UInt32 = UInt32.Parse(username.text);

Thanks a lot for all this input, it is working as expected now!
You were right, there was a hidden character.
This solved the problem:
string clean_string = username.text.Replace("\u200B", "")
With this cleaned up string, the parsing worked perfectly.
You saved my day. Wish you all the best!

look your lengths are different. you are missing something that you need to debug
Debug.Log(username.text.Length.ToString()); // Output: 7
Debug.Log(test_string.Length.ToString()); // Output: 6
UInt32.Parse Method only Converts the string representation of a number to its 32-bit unsigned integer equivalent. there must be a special character. Whitespace can appear at the beginning and at end but not between.

probably there is white space character in username.text
you can remove that white spaces with this code
username.text = username.text.Trim();
then parse it.
and when you use TryParse method there is no need to use Parse again. just change code to this
if (!UInt32.TryParse(username.text, out username_UInt32))
{
//handle error
}

You are failing to realize the .TryParse() will not only tell you that whether the parse is successful but will fill the out parameter with the new number. You keep trying to assign a value to that parameter.
private void button2_Click(object sender, EventArgs e)
{
string test_string = textBox1.Text.Trim();
if (!uint.TryParse(test_string, out uint test_UInt32))
{
MessageBox.Show("Invalid Input");
return;
}
if (!UInt32.TryParse(textBox1.Text.Trim(), out uint username_UInt32))
{
MessageBox.Show("Invalid Input");
return;
}
Debug.Print($"The input string is {test_string}, the resulting number is {test_UInt32}, of type {test_UInt32.GetType()}");
//Output The input string is 1234, the resulting number is 1234, of type System.UInt32
Debug.Print($"The input string is {textBox1.Text}, the resulting number is {username_UInt32}, of type {username_UInt32.GetType()}");
//Output The input string is 1234, the resulting number is 1234, of type System.UInt32
}

C#. Input string was not in a correct format

I'm new in the community and I'm learning C#. I try to write a program and faced with the problem below. I tried to find the answer in Google and here but no luck yet. When I choice "Y" I'm getting the error.
I attached the code and screenshot, please help if you can, thank you!
using System;
namespace YourAge
{
internal class Age
{
public static void Main()
{
DateTime newDataTime = DateTime.Now;
Console.WriteLine("So, today is " + "{0}", newDataTime);
Console.Write("Do you smoke a cigarettes? Y/N: ");
char Y = (char)Console.Read();
if (Char.IsUpper(Y))
{
Console.Write("How many cigarettes do you smoke in the day?: ");
int cigTotal = Convert.ToInt16(Console.ReadLine());
//cost of one cigarettes
float costOneCig = 0.3F;
float sumTotal = cigTotal * costOneCig;
Console.WriteLine("You are losing every day:{0:C2}", sumTotal);
}
else
//coming soon
Console.ReadKey();
}
}
}
This is the exception thrown:

The problem is that you are using Console.Read() instead of Console.ReadLine().
Console.Read() only reads the next character from standard input. Console.ReadLine(), on the other hand, reads the entire line of characters from the standard input stream and then moves to the next newline.
When you press 'Y' and then enter, when you get up to the next Console input, Convert.ToInt16(Console.ReadLine(), the Console is still up to the previous input line.
Possible solutions:
Change (char)Console.Read() to Covert.ToChar(Console.ReadLine()). ReadLine takes in an entire string, not a char, so you need to use Convert.ToChar instead of the simple (char) cast to convert the first character of the string into a char.
Add a blank Console.ReadLine() after (char)Console.Read() to tell the Console to flush to the next line.
Input your character together with the next number like "Y2" (although I highly doubt this is what you want to do).

string userInput = Console.ReadLine();
int numberOfCigarettes = Convert.ToInt16(userInput);
This might make it more visible for you what is the problem.
Console.ReadLine() returns a string which you later need to convert into an integer. If your userInput string is not a number, then conversion is impossible and an exception is thrown.
On the other hand your if statement is incorrect as well. Right now you are only checking the variable Y whether it is uppercase not whether it holds a literal character 'y'.
You could for example make sure that the variable Y is always uppercase like this:
if(Y.ToUpper().Equals('Y'))

You may want to try something like this so you can diagnose the problem. Please make sure to mark an answer if it is correct.
Console.Write("Do you smoke a cigarettes? Y/N: ");
string answer = Console.ReadLine();
while (answer.Length != 1) {
Console.WriteLine("Character is one letter silly.");
Console.Write("Do you smoke a cigarettes? Y/N: ");
answer = Console.ReadLine(); }
char response = answer[0];
if (response == 'Y' || response == 'y')
{
//YES RESPONSE
}
else
{
//NO RESPONSE
}
Console.ReadLine();
This code will let you know if you input anything else other than one character. Good luck with C#!

c# combine code with string

i am wondering how to combine code + int/string
example.
string USERINPUT = Console.ReadLine();
Console.ForgroundColor = ConsoleColor.USERINPUT
but that does not work. how to i wonder?

For the assignment
Console.ForegroundColor = (something here);
you must assign a ConsoleColor, which is an enum.
You can parse an enum value from it's string equivalent.
Console.ForegroundColor =
(ConsoleColor)System.Enum.Parse(typeof(ConsoleColor), USERINPUT);
For details see:
Search for a string in Enum and return the Enum
Note that my code does not include error handling. If the user types in a string at the console that is not a member of ConsoleColor, you will get an error condition.

How could I create a string with an object value in it?

This questions really isn't hard to understand. I have always wondered this and wondered if possible, how could it be done. Well this is sort what I'd like to do if possible:
int number = 50;
string text = "The number is %number";
Where I wrote %number in the string above, I would like the value of number to be inserted into the string, because the way I would usually go about doing something like this would be like:
int number = 50;
string text = "The number is " + number.ToString();
Which yes, the way I integrated number into the string above is an okay way of doing so, but I have always wondered, is it possible to do something such as the first example I wrote, where to put a value of an object into a string all you would have to do is write some type of character or string (used to reference the object), along with the name of the object into a string to get a result of a string with the value of the object in it? Or is there anything sort of like this you're able to do?

You would use string.Format:
string text = string.Format("The number is {0}", number);
Note that all objects have a ToString method, which means that all objects can be used as arguments to string.Format, however the default response from ToString is to return the full name of the type, which might not make much sense.
For instance, this:
public class Dummy
{
}
var d = new Dummy();
string text = string.Format("The dummy is {0}", d);
will assign something like the following value to text:
"The dummy is Your.Namespace.Dummy";
You have two options:
Override ToString and return something meaningful for your new type
Read off a property or something instead, e.g.:
string text = string.Format("The dummy is {0}", d.SomeProperty);
Also note that string.Format can take multiple arguments:
int a = 10;
int b = 20;
int c = a + b;
string text = string.Format("{0} + {1} = {2}", a, b, c);
There's a lot more to string.Format than what I have shown here, so click the link to the documentation (first line of this answer) to learn more.

You probably need to check Sting.Format
string text = String.Format("The number1 is {0},number2 is {1}", number1, number2);
It is also worth to check this discussion regarding When is it better to use String.Format vs string concatenation?
`

Characters not returning

How to fix the errors with characters in C# Employee class I am making. I know how to handle string, int, and double. The char.Parse doesn't cooperate.
public static string AskForLastName()
{
string inValue;
Console.Write("Enter last name: ");
inValue = Console.ReadLine();
return inValue; //works fine
}
public static char AskForGender()
{
char inValue;
Console.Write("Enter gender: ");
inValue = Console.ReadLine();//error here for some reason
return (char.Parse(inValue));//error here for some reason
}
public static int AskForNoDependendents()
{
string inValue;
Console.Write("Enter the dependents: ");
inValue = Console.ReadLine();
return (int.Parse(inValue));//works fine
}
public static double AskForAnnualSalary()
{
string inValue;
Console.Write("Enter annual salary: ");
inValue = Console.ReadLine();
return (double.Parse(inValue));//works fine
}

Console.ReadLine() returns a string. You can't implicitly convert that to a character- what if someone enters "Male" or " M" (preceded by one or more spaces).
Your AskForGender method is going to need to be smarter about what input it accepts, and how it parses that input.
If you really need a character out of this (to satisfy the assignment, or whatever), then you need to figure out a way to get from all of the possible String inputs ("Male", "MALE", "Female", "Horse", "Dog", "4", etc.) to either:
An acceptable Character (presumably 'M' or 'F', but maybe others?)
or
An error condition, whereupon maybe you print a nice error message and ask them to re-enter?

Description
Console.ReadLine returns a string. You can use string[] to get the first character of your string. But you have to make sure that the user inserts at least one character.
Sample
public static char AskForGender()
{
while (true)
{
Console.Write("Enter gender (m/w): ");
string inValue = Console.ReadLine();
// check that the user inputs a character
if (!string.IsNullOrEmpty(inValue) && (inValue[0] == 'm' || inValue[0] == 'w'))
return inValue[0];
}
}
Update
My sample covers now that the user inputs m or w.
Update
It is homework so...
If your Teacher ask "But what happens if the user inputs a M instead of m? You should say "It asks the user again".
If your Teacher asks then "How to make it possible to accept M and m? You should say i can make it case insensitive.
Sample
You should use i can use .NET's .ToUpper() method.
.ToUpper() - Returns a copy of this string converted to uppercase.
public static char AskForGender()
{
while (true)
{
Console.Write("Enter gender (m/w): ");
string inValue = Console.ReadLine();
// check that the user inputs a character
if (!string.IsNullOrEmpty(inValue) && (inValue.ToUpper()[0] == 'M' || inValue.ToUpper()[0] == 'W'))
return inValue.ToUpper()[0]; // returns M or W
}
}

You're trying to pull a string into a char. Console.ReadLine() returns a string.
If you need specifically one character (Presumably M or F) consider making your inValue a string, trimming it (to ensure there are no leading spaces), and then returning inValue[0] (which should be a char)
Something like:
string inValue = Console.ReadLine();
inValue = inValue.Trim();
return inValue[0];
**Note- that's not the best way to do it, but it should make the idea fairly clear.

According to MSDN ReadLine returns a string - you can't assign a string to a char!