C#

Member 12616185 wrote:

var myResults = Object1.Where(m => m.Object2.Select(o => o.Value == "802.11g") != null);

var myResults = Object1.Where(m => m.Object2.Any(o => o.Value == "802.11g"));

using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp3
{
  class Program
  {
    static void Main(string[] args)
    {
      List<Object1> origCollection = new List<Object1>()
        {
          new Object1() {ID = 1, theList = new List<Object2>()
            {
              new Object2() { Name = "Mode", Value = "802.11b" },
              new Object2() { Name = "BW", Value = "20" },
              new Object2() { Name = "Chan", Value = "1" },
              new Object2() { Name = "Tech", Value = "SISO" }
            }
          },
          new Object1() { ID = 2, theList = new List<Object2>()
            {
              new Object2(){ Name = "Mode", Value = "802.11g" },
              new Object2(){ Name = "BW", Value = "20" },
              new Object2(){ Name = "Chan", Value = "1" },
              new Object2(){ Name = "Tech", Value = "SISO" }
            }
          }   
        };

        var theCollection0 = origCollection.Where(m => m.theList.Select(n => n.Value == "802.11b") != null); // Broken

        var theCollection1 = origCollection.Where(m => m.theList.Any(n => n.Value == "802.11b"));            // Works!
        var theCollection3 = origCollection.Where(m => m.theList.Any(n => n.Value == "802.11z"));            // Returns Empty as expected.
    }
  };


  class Object1
  {
    public int ID { get; set; }
    public List<Object2> theList; 
  }

  class Object2
  {
    public string Name { get; set; }
    public string Value { get; set; }
  }
}

IEnumerable<Object1> myResults = myList.Where(m => m.theList.Any(o => o.Name == "Blah"));

if (ball.Location.X > player1.Location.X && ball.Location.X + ball.Width < player1.Location.X + player1.Width && ball.Location.Y + ball.Height > player1.Location.Y)
            {
                
                bvelY *= -1;
            }

if (ball.Location.Y < 0)
            {
                pl1Score++;
                ball.Location = new Point(this.Width / 2, this.Height / 2);
 
            }

pl1Score++;

if (ball.Location.Y < 0)

if (ball.Location.Y < 0)
            {
                pl1Score++;
                ball.Location = new Point(this.Width / 2, this.Height / 2);

            }

if (ball.Location.Y > this.Height)
            {
                pl2Score++;
                ball.Location = new Point(this.Width / 2, this.Height / 2);
            }

if ( ball.Location.X > player1.Location.X 
  && ball.Location.X + ball.Width < player1.Location.X + player1.Width 
  && ball.Location.Y + ball.Height > player1.Location.Y)
            {

                bvelY *= -1;
            }

if (ball.Location.Y < 0)
            {
                pl1Score++;
                ball.Location = new Point(this.Width / 2, this.Height / 2);

            }

try
{
// Code that throws exceptions
}
catch (Exception e)
{
e.ToString(); // Put breakpoint here and use the debugger to examine the exception object
}

EXCEPTION StackTrace:    at TreeView.frmResources.DropTargetListBox_DragDrop(Object sender, DragEventArgs e) in D:\xxx\TreeView\frmResources.cs:line 255

private static string ExceptionToString ( Exception exception_object , int errorcount )
		{
			if ( exception_object == null ) return "";
			StringBuilder result = new StringBuilder ( );
			result.Append ( "General Exception " + errorcount + ": \n" );
			result.Append ( "Message: " + exception_object.Message + "\n" );
			result.Append ( "Source: " + exception_object.Source + "\n" );
			result.Append ( "HelpLink: " + exception_object.HelpLink + "\n" );
			result.Append ( "TargetSite: " + exception_object.TargetSite + "\n" );
			if ( exception_object.Data != null )
			{
				result.Append ( "Exception Data: \n" );
				foreach ( DictionaryEntry item in exception_object.Data )
					result.AppendFormat ( "{0} : {1}\n" , item.Key , item.Value );
			}

			if ( exception_object.InnerException != null )
			{
				result.Append ( "InnerException.Message: " + exception_object.InnerException.Message + "\n" );
				result.Append ( "InnerException.Source: " + exception_object.InnerException.Source + "\n" );
				result.Append ( "InnerException.HelpLink: " + exception_object.InnerException.HelpLink + "\n" );
				result.Append ( "InnerException.TargetSite: " + exception_object.InnerException.TargetSite + "\n" );
				if ( exception_object.Data != null )
				{
					result.Append ( "Exception Data: \n" );
					foreach ( DictionaryEntry item in exception_object.Data )
						result.AppendFormat ( "{0} : {1}\n" , item.Key , item.Value );
				}
			}

			result.Append ( "\n\n\n EXCEPTION StackTrace: " + exception_object.StackTrace + "\n" );
			if ( exception_object.InnerException != null ) result.Append ( "\n\n\n INNER EXCEPTION StackTrace: " + exception_object.InnerException.StackTrace + "\n" );

			return result.ToString ( );
		}

try
	{
		// do something
		}
		catch ( Exception ex )
		{
			ExceptionToString ( ex , "Some text to add to output" );
			throw;
		}