Develop Reference

No Suitable Methods to Override

I Have tried many ways to get this to return these values for a project, but I keep getting these problems no matter what way. help please
using System;
using System.Collections.Generic;
namespace MpaintV2.Customer
{
public class Trade : Utilities.Helper
{
//public static List<String> TradeFiles(String TradeName, String TradeAddress, String TradePhone, Double PaintCoverage = 0.0)
//{
public override string ToString(String TradeName, String TradeAddress, String TradePhone, String TradeShape, double PaintCoverage)
{
List<string> FileData = Utilities.Helper.get_file_data();
for (int counter = 0; counter < FileData.Count; counter++)
{
String[] SplitRecord = FileData[counter].Split(',');
if (SplitRecord[0].Equals("Trade"))
{
TradeName = SplitRecord[1];
TradeAddress = SplitRecord[2];
TradePhone = SplitRecord[3];
PaintCoverage = (double.Parse(SplitRecord[4]) / 10.00);
}
//Console.WriteLine(" " + TradeName + " " + TradeAddress + " " + TradePhone + " " + PaintCoverage + "Paints");
}
return TradeName + TradeAddress + TradePhone + TradeShape + PaintCoverage;
}
}
}

Implement User Log in a Centralized Way

I'm currently working on finding a way to Log UserActions/Requests. I'm inclined towards logging the details to a text file. The LOG details are organized in a tree-like (hierarchical) structure so that it is readable and shows method names in a step-by-step manner. (if a request went through several methods)
I have a sample app which works fine but it is not the way how it should be. Consider the following classes.
Node class which is the template to make a tree-like (hierarchical) structure. It has attributes such as name (method name), Time and a List type para named Children.
public class Node
{
public string Name; // method name
public DateTime Time; // time when accessed
public List<Node> Children;
public static void PrintTree(Node tree)
{
string temp = "";
List<Node> firstStack = new List<Node>();
firstStack.Add(tree);
List<List<Node>> childListStack = new List<List<Node>>();
childListStack.Add(firstStack);
while (childListStack.Count > 0)
{
List<Node> childStack = childListStack[childListStack.Count - 1];
if (childStack.Count == 0)
{
childListStack.RemoveAt(childListStack.Count - 1);
}
else
{
tree = childStack[0];
childStack.RemoveAt(0);
string indent = "";
for (int i = 0; i < childListStack.Count - 1; i++)
{
indent += (childListStack[i].Count > 0) ? "| " : " ";
}
temp = indent + "+- " + tree.Name + " (" + tree.Time + ")";
Console.WriteLine(indent + "+- " + tree.Name + " (" + tree.Time + ")");
File.AppendAllText(#"C:\Users\aimalkhan\Desktop\Log Work\Log.txt", temp + Environment.NewLine);
if (tree.Children != null)
{
if (tree.Children.Count > 0)
{
childListStack.Add(new List<Node>(tree.Children));
}
}
}
}
File.AppendAllText(#"C:\Users\aimalkhan\Desktop\Log Work\Log.txt", Environment.NewLine + "*************************************************************" + Environment.NewLine);
}
}
My sample Employee class with a sample method SetEmployeeName() having AN EXTRA parameter of NODE type for Logging purposes.
public class Employee
{
private string FirstName { get; set; }
private string LastName { get; set; }
public string SetEmployeeName(string firstName, string lastName, Node node)
{
node.Name = "Class Name: " +this.GetType().Name + ", Calling method Name: setEmployeeName()";
node.Time = DateTime.Now;
this.FirstName = firstName;
this.LastName = lastName;
return this.FirstName + " " + this.LastName;
}
public void CompleteTask(string empName, string taskName)
{
Console.WriteLine("Employee: " + empName + " is completing the task: " + taskName);
}
}
and finally this is how i'm using the aforementioned sample of Codes.
Node root = new Node();
root.Name = "ClassName: Main";
root.Time = DateTime.Now;
root.Children = new List<Node>();
Node child = new Node();
Employee emp = new Employee();
emp.SetEmployeeName("John", "D", child);
root.Children.Add(child);
Node.PrintTree(root);
This is how the output looks
Now my question is that it would really be a headache for me to pass a NODE type para every time i need a child info log. Could this be some how made centralized in any possible way? Is there a better way than this one? A little guidance would really be appreciated.

I cannot figure out how to fix an unhandled Format Excpetion

I am trying to write a C# program using Visual Studio that reads data from a file and allow me perform various sorts on the data. I am a beginner so it took much research to figure out how to write this code: Now I get a:
Format Exception was unhandled. Input string was not in a correct
format
I am not sure where I went wrong. This is happening for the following line of code:
Candidate newrec = new Candidate(str[0], str[1], str [2], str[3], str[4], str[5], str[6], Convert.ToInt32(str[7]), str[8], str[9], str[10], str[11]);
The entire code is as follows:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Collections;
namespace Unit4IP
{
//used to sort in asceding and descending order
public struct Candidate:IComparable
{
public char[] _FirstName;
public char[] _LastName;
public char[] _Company;
public char[] _Address;
public char[] _City;
public char[] _Country;
public char[] _State;
public char[] _Phone;
public char[] _Fax;
public char[] _Email;
public char[] _Web;
public int _zip;
//for comparing objects
public int CompareTo(object obj)
{
Candidate Candidate2 = (Candidate)obj;
return _LastName.ToString().CompareTo(Candidate2._LastName.ToString());
}
//implements sorting based on assignments such as zip, lastname, etc.
public int CompareTo(Candidate Candidate2,
CandidateComparer.ComparisonType comptype)
{
if(comptype==CandidateComparer.ComparisonType.Lastname)
{
String _LName = new String(_LastName);
String LName = new String(Candidate2._LastName);
return _LName.CompareTo(LName);// Convert Character Array to String because CompareTo Works efficiently with Strings
}
else
{
return Candidate2._zip.CompareTo(_zip); // compareto values that are interchanged in descending order
}
}
//Constructor of Candidate Structure
public Candidate(string FirstName, string LastName, string Company, string Address, string City, string Country, string State, int zip, string Phone, string Fax, string Email, string Web)
{
_FirstName = new char[12];
_LastName = new char[16];
_Company = new char[32];
_Address = new char[32];
_City = new char[24];
_Country = new char[24];
_State = new char[2];
_Phone = new char[12];
_Fax = new char[12];
_Email = new char[32];
_Web = new char[42];
_FirstName = FirstName.ToCharArray();
_LastName = LastName.ToCharArray();
_Company = Company.ToCharArray();
_Address = Address.ToCharArray();
_City = City.ToCharArray();
_Country = Country.ToCharArray();
_State = State.ToCharArray();
_zip = zip;
_Phone = Phone.ToCharArray();
_Fax = Fax.ToCharArray();
_Email = Email.ToCharArray();
_Web = Web.ToCharArray();
}
//Implement IComparer Interface as nested structure
public struct CandidateComparer : IComparer
{
public enum ComparisonType
{ Lastname = 1, zip = 2 }
private ComparisonType _comparisonType;
public ComparisonType comptype
{
get { return _comparisonType; }
set { _comparisonType = value; }
}
public int Compare(object x, object y)
{
Candidate Candidate1 = (Candidate)x;
Candidate Candidate2 = (Candidate)y;
return Candidate1.CompareTo(Candidate2, _comparisonType);
}
}
}
class Program
{
static void Main(string[] args)
{
ArrayList ArrayTest = new ArrayList();
//Loading of File 'ITCO321_U4_sample_data.csv' into ArraList. File only holds values, no heading i.e. remove headings
StreamReader stream1 = File.OpenText("c:\\Users\\Cdhss\\Documents\\ITCO321_U4IP_sample_data-2.csv");
string recdata = null;
while ((recdata = stream1.ReadLine()) != null)
{
string[] str = recdata.Split(',');
Candidate newrec = new Candidate(str[0], str[1], str [2], str[3], str[4], str[5], str[6], Convert.ToInt32(str[7]), str[8], str[9], str[10], str[11]);
ArrayTest.Add(newrec);//add struct object into ArrayList
}
//Traversing of Records
Console.WriteLine("Traversing Records");
foreach (Candidate Candidate1 in ArrayTest)
{
string fname = new String(Candidate1._FirstName);
string lname=new String(Candidate1._LastName);
string company = new String(Candidate1._Company);
string address=new String(Candidate1._Address);
string city=new String(Candidate1._City);
string country = new String(Candidate1._Country);
string phone = new String(Candidate1._Phone);
string fax = new String(Candidate1._Fax);
string email=new String(Candidate1._Email);
string web = new String(Candidate1._Web);
Console.WriteLine( fname + "," + lname + "," + company + "," + address + "," + city + "," + country + "," + Candidate1._zip + "," + phone + "," + fax + "," + email + "," + web);
}
Candidate.CandidateComparer comparer = new Candidate.CandidateComparer();
//Sort by Lastname in ascending order
comparer.comptype = Candidate.CandidateComparer.ComparisonType.Lastname;
ArrayTest.Sort(comparer);
Console.WriteLine("Sorting of Elements by LastName");
foreach (Candidate Candidate1 in ArrayTest)
{
string fname = new String(Candidate1._FirstName);
string lname = new String(Candidate1._LastName);
string company = new String(Candidate1._Company);
Console.WriteLine("\t" + fname + "," + lname + "," + company);
}
// Data sorted in desending order of ZIP field
comparer.comptype = Candidate.CandidateComparer.ComparisonType.zip;
ArrayTest.Sort(comparer);
Console.WriteLine("Sorting of Elements by Zip");
foreach (Candidate Candidate1 in ArrayTest)
{
string fname = new String(Candidate1._FirstName);
string lname = new String(Candidate1._LastName);
string company = new String(Candidate1._Company);
Console.WriteLine("\t" + fname + "," + lname + "," + company + "," + Candidate1._zip);
}
//Display Records of 'NY' State
Console.WriteLine("Display Records of NY State");
foreach (Candidate Candidate1 in ArrayTest)
{
string fname = new String(Candidate1._FirstName);
string lname = new String(Candidate1._LastName);
string company = new String(Candidate1._Company);
string address = new String(Candidate1._Address);
string city = new String(Candidate1._City);
string country = new String(Candidate1._Country);
string phone = new String(Candidate1._Phone);
string fax = new String(Candidate1._Fax);
string email = new String(Candidate1._Email);
string web = new String(Candidate1._Web);
if (new String(Candidate1._State).Contains("NY"))
Console.WriteLine(fname + "," + lname + "," + company + "," + address + "," + city + "," + country + "," + Candidate1._zip + "," + phone + "," + fax + "," + email + "," + web);
}
Console.Read();
}
}
}

Your problem is in your call to Convert.ToInt32. Whatever string you are passing can't be parsed as an int.
A good solution here might be to use the some structured exception handling, either with try catch blocks or Int32.TryParse(string) for example you could do this
int intValue;
if (Int32.TryParse(str[7], out intValue))
{
//Do some thing with the int value
}
else
{
throw new Exception("Some informative error message, probably using string.Format to include the string you tried to parse");
}
TryParse returns true if the parse is successfull, false if it is not, and puts the parsed integer value in the second out parameter.
A few other comments on you code to help you out.
No one uses ArrayLists in C# anymore. Generics were introduced a long time ago, and it is almost always better, from a standpoint of both type safety and speed to use a List (Look up C# generics if you don't know what they are).
You don't need to copy the candidate properties in your foreach loop into new variables.
Give more informative variable names. Readability is the single most important quality in good code. fname should be firstName, recdata should be recievedData. Key strokes are cheap in a world with tab completion.

How to loop through properties of objects in c#?

I have a method which gets the values of the properties of an object and appends some commas to it. I want to make this generinc so i can use it with other objects.
foreach (var row in rows.ToList())
{
sbResult.Append(
delimiter + row.MediaName + delimiter + separator +
delimiter + row.CountryName + delimiter + separator +
delimiter + row.ItemOverRideDate + delimiter + separator +
delimiter + row.Rating + delimiter + separator +
delimiter + row.BatchNo + delimiter + separator +
delimiter + row.NoInBatch + delimiter + separator +
delimiter + row.BatchDate + delimiter + separator +
delimiter + row.DataType + delimiter + separator +
delimiter + row.ByLine + delimiter + separator +
delimiter + row.IssueNo + delimiter + separator +
delimiter + row.Issue + delimiter + separator +
delimiter + row.MessageNo + delimiter + separator +
delimiter + row.Message + delimiter + separator +
delimiter + row.SourceName + delimiter + separator +
delimiter + row.SourceType + delimiter + separator);
//end of each row
sbResult.AppendLine();
}
I have tried using var rowData = row.GetType().GetProperties(); but it only returns the property itself and I dont know how to get the value of the property.

Since Type.GetProperties returns a collection of PropertyInfo, you follow that up by calling PropertyInfo.GetValue. Here's how you can do that (and all the rest together) with LINQ:
var line = string.Join(
row.GetType().GetProperties()
.Select(pi => pi.GetValue(row))
.Select(v => delimiter + v.ToString() + delimiter),
separator);
However, you might want to reconsider your approach. This code will break if GetProperties fetches static properties or indexers along with "normal" properties; it also requires that the code be run with full trust (otherwise no reflection is possible). And finally, it's going to be slow because a) reflection is inherently slow and b) it will keep reflecting on the same things over and over again without caching any of the information it has already discovered.
In addition to the above potential problems, if there is even a remote chance that you will later want to filter what gets printed out it is probably better to encapsulate this logic inside a (virtual?) method on row and just do something like
sbResult.AppendLine(row.SerializeAsLine());

You can use something like this to iterate over all the properties of a particular type:
public static IEnumerable<KeyValuePair<string, T>> PropertiesOfType<T>(object obj)
{
return from p in obj.GetType().GetProperties()
where p.PropertyType == typeof(T)
select new KeyValuePair<string, T>(p.Name, (T)p.GetValue(obj));
}
Then you could specify the type as string for all your string properties.
Compilable sample:
using System;
using System.Collections.Generic;
using System.Linq;
namespace ConsoleApplication1
{
class Program
{
private static void Main()
{
var test = new Test
{
Str1 = "S1",
Str2 = "S2",
Str3 = "S3",
Str4 = "S4"
};
foreach (var property in PropertiesOfType<string>(test))
{
Console.WriteLine(property.Key + ": " + property.Value);
}
}
public static IEnumerable<KeyValuePair<string, T>> PropertiesOfType<T>(object obj)
{
return from p in obj.GetType().GetProperties()
where p.PropertyType == typeof(T)
select new KeyValuePair<string, T>(p.Name, (T)p.GetValue(obj));
}
}
public class Test
{
public string Str1 { get; set; }
public string Str2 { get; set; }
public string Str3 { get; set; }
public string Str4 { get; set; }
}
}

Here it is.
List<PropertyInfo> _propInfo = _row.GetType().GetProperties();
foreach (var item in _propInfo)
{
object _value = item.GetValue(_row, null);
if (_value != null)
{
// Save the Value
}
}

GetProperties returns an array of PropertyInfo, so use the GetValue method and use your object as it's input to get the value for each property. Here is the code:
public class MyClass
{
public string MyProperty1 { get; set; }
public string MyProperty2 { get; set; }
public string MyProperty3 { get; set; }
}
Then
MyClass myObj = new MyClass() { MyProperty1 = "first", MyProperty2 = "second", MyProperty3 = "third" };
List<string> array = new List<string>();
foreach (var item in typeof(MyClass).GetProperties())
{
array.Add(item.GetValue(myObj, null).ToString());
}
var result = string.Join(",", array); //use your own delimiter

var values = instance
.GetType()
.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Select(z => string.Format("{0}: {1}\n", z.Name, z.GetValue(instance, null)));
string res = string.Concat(values);
Where instance is the instance of your object. You might want to avoid LINQ and use a loop if StringBuilder is required (depending on the number of properties).

Delimiter Replacement Approach

I’d like to create a method to replace delimiters for the intended target use (html email, log, database). The delimiters are constant so I’d like to be able to reference a object that maps recognizable names to string values (semicolon = “;”, htmlLineBreak = “<br/>”, etc.). Is there a better means to do this than this below?
public static class Utilities
{
public string ReplaceDelimiter(string content
, Delimiter currentDelimiter, Delimiter outputDelimiter)
{
return content.Replace(currentDelimiter.ToString()
, outputDelimiter.ToString());
}
}
public class Delimiter
{
public const string comma = ",";
public const string semicolon = ";";
public const string colon = ":";
public const string lineBreak = "\r\n";
public const string htmlLineBreak = "<br/>";
}
Edited following comments:
A use case would be when I want to log an error to different targets and send the same contents (formatted differently) in an email. The log may go to a database column (want key/value with semicolon delimiter) or log file (want delimiter to be line breaks). The email would be HTML so want the delimiter to be replaced with <br/>.
Below would be an excerpt from a logging method that has a few parameters including the actual Exception:
StringBuilder delimitedMessage = new StringBuilder();
delimitedMessage.Append("Date=" + DateTime.Now.ToShortDateString() + ";");
delimitedMessage.Append("Time=" + DateTime.Now.ToLongTimeString() + ";");
delimitedMessage.Append("Source=" + objException.Source.ToString().Trim() + ";");
delimitedMessage.Append("Method=" + objException.TargetSite.Name.ToString() + ";");
delimitedMessage.Append("Erring Method=" + methodName + ";");
delimitedMessage.Append("Computer=" + System.Environment.MachineName.ToString() + ";");
delimitedMessage.Append("Log Message=" + logMessage + ";");
delimitedMessage.Append("Exception Error=" + objException.Message.ToString().Trim() + ";");
delimitedMessage.Append("Severity=" + severity.ToString() + ";");
delimitedMessage.Append("Stack Trace=" + objException.StackTrace.ToString().Trim() + ";");
contentToLog = delimitedMessage.ToString();
WriteToDb(contentToLog);
WriteToLog(Utilities.ReplaceDelimiter(contentToLog, Delimiter.semicolon, Delimiter.lineBreak));
SendEmail(Utilities.ReplaceDelimiter(contentToLog, Delimiter.semicolon, Delimiter.htmlLineBreak));

Code
public class Delimiter {
public static readonly Delimiter
HtmlLineBreak=new Delimiter {
Value="<br/>"
},
LineBreak=new Delimiter {
Value="\r\n"
},
Semicolon=new Delimiter {
Value=";"
},
Colon=new Delimiter {
Value=":"
},
Comma=new Delimiter {
Value=","
};
public override String ToString() {
return Value;
}
public String Value {
get;
set;
}
}
Test
var t=Utilities.ReplaceDelimiter("123\r\n", Delimiter.LineBreak, Delimiter.HtmlLineBreak);
Debug.Print("{0}", t);
Output
123<br/>