How to Remove duplicates from a IEnumerable using C# or VB.NET

To Remove duplicates from a IEnumerable using C# or VB.NET you can use the snippet below.

Sample .NET 3.5 and newer

Sample C#

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

namespace de.Fesslersoft.DistinctIenumerbable
{
    class Program
    {
        static void Main(string[] args)
        {
            var myList = new List<string>
            {
                "1A", "1A", "1B", "1C", "1C", "1D", "1D"
            };

            myList = myList.Distinct().ToList();

            foreach (var item in myList)
            {
                Console.WriteLine(item);
            }
            Console.Read();
        }
    }
}

Sample VB.NET (autogenerated)

Imports System.Collections.Generic
Imports System.Linq

Namespace de.Fesslersoft.DistinctIenumerbable
	Class Program
		Private Shared Sub Main(args As String())
			Dim myList = New List(Of String)() From { _
				"1A", _
				"1A", _
				"1B", _
				"1C", _
				"1C", _
				"1D", _
				"1D" _
			}

			myList = myList.Distinct().ToList()

			For Each item As var In myList
				Console.WriteLine(item)
			Next
			Console.Read()
		End Sub
	End Class
End Namespace

Sample .NET 2.0

Sample C#

using System;
using System.Collections.Generic;

namespace de.Fesslersoft.DistinctIenumerbable
{
    class Program
    {
        static void Main(string[] args)
        {
            List<String> myList = new List<string>();
            myList.Add("1A");
            myList.Add("1A");
            myList.Add("1B");
            myList.Add("1C");
            myList.Add("1C");
            myList.Add("1D");
            myList.Add("1D");

            var newList = new List<String>();
            foreach (var item in DistinctIenumerable(myList))
            {
                newList.Add(item);
            }

            foreach (var item in newList)
            {
                Console.WriteLine(item);
            }
            Console.Read();
        }

        internal static IEnumerable<T> DistinctIenumerable<T>(IEnumerable<T> input)
        {
            var passedValues = new Dictionary<T, bool>();
            foreach (T item in input)
            {
                if (!passedValues.ContainsKey(item))
                {
                    passedValues.Add(item, false);
                    yield return item;
                }
            }
        }
    }
}

Sample VB.NET (autogenerated)

Imports System.Collections.Generic

Namespace de.Fesslersoft.DistinctIenumerbable
	Class Program
		Private Shared Sub Main(args As String())
			Dim myList As List(Of [String]) = New List(Of String)()
			myList.Add("1A")
			myList.Add("1A")
			myList.Add("1B")
			myList.Add("1C")
			myList.Add("1C")
			myList.Add("1D")
			myList.Add("1D")

			Dim newList = New List(Of [String])()
			For Each item As var In DistinctIenumerable(myList)
				newList.Add(item)
			Next

			For Each item As var In newList
				Console.WriteLine(item)
			Next
			Console.Read()
		End Sub

		Friend Shared Function DistinctIenumerable(Of T)(input As IEnumerable(Of T)) As IEnumerable(Of T)
			Dim passedValues = New Dictionary(Of T, Boolean)()
			For Each item As T In input
				If Not passedValues.ContainsKey(item) Then
					passedValues.Add(item, False)
					yield Return item
				End If
			Next
		End Function
	End Class
End Namespace

How to delete .svn files and folders using Windows Batch Script

to delete .svn files and folders using Windows Batch Script you can use the following snippet.

Sample Windows Batch Script

FOR /R "C:\Users\CodeSnippets.Fesslersoft.de\Documents\Visual Studio 2013\Projects\ConsoleApplication" %%X IN (.svn) DO (RD /S /Q "%%X" 2>nul)

Replace C:\Users\CodeSnippets.Fesslersoft.de\Documents\Visual Studio 2013\Projects\ConsoleApplication with your Solution’s Path.

How to remove any post that is older than X days in WordPress

To remove any post that is older than X days in WordPress you can use the query below.

Sample mySQL

DELETE FROM wp_posts WHERE post_type = 'post' AND DATEDIFF(NOW(), post_date) > X

How to empty an array in Javascript

To empty an array in Javascript you can use the following methods.

Sample Javascript

myArray = [];

This code will set the variable A to a new empty array (take care if you have references to the “old” array).

or

myArray.length = 0

This will clear the existing array by setting its length to 0.

or

myArray.splice(0,myArray.length)

Working, but not recommended for this task. see Array.prototype.splice()

or

while(myArray.length > 0) {
    myArray.pop();
}

Fastest solution, without breaking references.

How to Set / Clear and Toggle a single bit in C/C++

To Set / Clear and Toggle a single bit in C++ see the methods below.

Setting a bit

Use the bitwise OR operator (|) to set a bit.

number |= 1 << x;

Clearing a bit

Use the bitwise AND operator (&) to clear a bit.

number &= ~(1 << x);

Toggling a bit

The XOR operator (^) can be used to toggle a bit.

number ^= 1 << x;

Source