How to remove specific (unicode) characters in a String using C# and VB.NET

Here is an example on how to remove specific (unicode) characters in a String using C# and VB.NET

Samples

C# Sample

VB.NET Sample

Result

RegexReplaceUnicodeChars

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How to change the encoding of a String using C# and VB.NET

To change the encoding of a String using .NET you can use this Extension Method which is part of the Fesslersoft.Extensions. This method needs a source and a target encoding. Some people might find the source encoding parameter needless, but as Joel stated in his excellent blogpost

“It does not make sense to have a string without knowing what encoding it uses” (Joel Spolsky)

Samples

Sample C#

VB.NET Sample

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How to convert a Securestring to String using C# and VB.NET

Here is an example on how to convert a Securestring to String using C# and VB.NET.
Please remember that storing the data in a plain string will be beat the whole point of using SecureString. This method should only be used for testing purposes.
This Extension Method is now part of the Fesslersoft.Extensions.

Samples

C# Sample

VB.NET Sample

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How to convert a String to Securestring using C# and VB.NET

Here is an example on how to convert a String to Securestring using C# and VB.NET.
Please remember that the plain string which will be converted to SecureString beats the whole point of using SecureString. This method should only be used for testing purposes.
This Extension Method is now part of the Fesslersoft.Extensions.

Samples

C# Sample

VB.NET Sample

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How to read a embedded resource to String in C# and VB.NET

To read a embedded resource to String in C# and VB.NET you can use the snippet below.
Keep in mind that this snippet is using Encoding.Default which might not always work in all situations correctly.

Sample C#

Sample VB.NET (autogenerated)

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How to match strings using wildcards in C# and VB.NET

To match strings using wildcards in C# and VB.NET you can use the following snippet.
It will internally convert the wildcard string to a Regex.

The Console-Output of this sample will be:

C:\Test\myFile01.xml
C:\Test\myFile02.xml

Sample C#

#region

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

#endregion

namespace de.fesslersoft.RegexWildCard
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var fileList = new List<String>();
            fileList.Add(@"C:\Test\myFile01.xml");
            fileList.Add(@"C:\Test\myFile02.xml");
            fileList.Add(@"C:\Test\myFolder01.xml");
            fileList.Add(@"C:\Test\myFolder02.xml");

            var wildCard = new Wildcard("*File*.xml", RegexOptions.IgnoreCase);
            foreach (var file in fileList.Where(file => wildCard.IsMatch(file)))
            {
                Console.WriteLine(file);
            }
            Console.Read();
        }
    }


    public class Wildcard : Regex
    {
        public Wildcard(string pattern) : base(ToRegex(pattern))
        {
        }

        public Wildcard(string pattern, RegexOptions options) : base(ToRegex(pattern), options)
        {
        }

        public static string ToRegex(string pattern)
        {
            return "^" + Escape(pattern).Replace("\\*", ".*").Replace("\\?", ".") + "$";
        }
    }
}

Sample VB.NET (autoconverted)

#Region ""

Imports System.Collections.Generic
Imports System.Linq
Imports System.Text.RegularExpressions

#End Region

Namespace de.fesslersoft.RegexWildCard
	Friend Class Program
		Private Shared Sub Main(args As String())
			Dim fileList = New List(Of [String])()
			fileList.Add("C:\Test\myFile01.xml")
			fileList.Add("C:\Test\myFile02.xml")
			fileList.Add("C:\Test\myFolder01.xml")
			fileList.Add("C:\Test\myFolder02.xml")

			Dim wildCard = New Wildcard("*File*.xml", RegexOptions.IgnoreCase)
			For Each file As var In fileList.Where(Function(file) wildCard.IsMatch(file))
				Console.WriteLine(file)
			Next
			Console.Read()
		End Sub
	End Class


	Public Class Wildcard
		Inherits Regex
		Public Sub New(pattern As String)
			MyBase.New(ToRegex(pattern))
		End Sub

		Public Sub New(pattern As String, options As RegexOptions)
			MyBase.New(ToRegex(pattern), options)
		End Sub

		Public Shared Function ToRegex(pattern As String) As String
			Return "^" + Escape(pattern).Replace("\*", ".*").Replace("\?", ".") + "$"
		End Function
	End Class
End Namespace

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How to read a String to Textreader using C# and VB.NET

To read a String to Textreader using C# and VB.NET you can use the snippet below.

Sample C#

using(TextReader textReader = new StringReader("string"))
{
    //...
}

Sample VB.NET

Using textReader As TextReader = New StringReader("string")
    '...
End Using

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How to trim a string using XSL 1.0

Since XSL 1.0 dows not have inbuild Trimming functions for Strings, you need to define your own templates.
You can use the Trim Templates shown in the codesnippet below.

Sample XSL

<xsl:variable name="whitespaceCharacters" select="'&#09;&#10;&#13; '" />
    
    <!-- Trim Right side of the String -->
    <xsl:template name="TrimRight">
        <xsl:param name="input" />
        <xsl:param name="trim" select="$whitespaceCharacters" />
        
        <xsl:variable name="length" select="string-length($input)" />
        <xsl:if test="string-length($input) &gt; 0">
            <xsl:choose>
                <xsl:when test="contains($trim, substring($input, $length, 1))">
                    <xsl:call-template name="TrimRight">
                        <xsl:with-param name="input" select="substring($input, 1, $length - 1)" />
                        <xsl:with-param name="trim" select="$trim" />
                    </xsl:call-template>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:value-of select="$input" />
                </xsl:otherwise>
            </xsl:choose>
        </xsl:if>
    </xsl:template>
    
    <!-- Trim Left side of the String -->
    <xsl:template name="TrimLeft">
        <xsl:param name="input" />
        <xsl:param name="trim" select="$whitespaceCharacters" />
        
        <xsl:if test="string-length($input) &gt; 0">
            <xsl:choose>
                <xsl:when test="contains($trim, substring($input, 1, 1))">
                    <xsl:call-template name="TrimLeft">
                        <xsl:with-param name="input" select="substring($input, 2)" />
                        <xsl:with-param name="trim" select="$trim" />
                    </xsl:call-template>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:value-of select="$input" />
                </xsl:otherwise>
            </xsl:choose>
        </xsl:if>
    </xsl:template>
    
    <!-- Trim both sides of the String -->
    <xsl:template name="Trim">
        <xsl:param name="input" />
        <xsl:param name="trim" select="$whitespaceCharacters" />
        <xsl:call-template name="TrimRight">
            <xsl:with-param name="input">
                <xsl:call-template name="TrimLeft">
                    <xsl:with-param name="input" select="$input" />
                    <xsl:with-param name="trim" select="$trim" />
                </xsl:call-template>
            </xsl:with-param>
            <xsl:with-param name="trim" select="$trim" />
        </xsl:call-template>
    </xsl:template>

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How to use substring in IOS using Objective-C

To use substring in IOS using Objective-C you can use the snippet below.

Sample Objective-C

NSString *myString = @"http://codesnippets.fesslersoft.de";
NSString *myNewString = [myString substringFromIndex:7]; //myNewString will be "codesnippets.fesslersoft.de"

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Case-Insensitive String.Replace in C# and VB.NET

Here you can find a Case-Insensitive String.Replace method for C# and VB.NET.

Sample C#

public static string ReplaceWithStringComparison(string input, string search, string replace, StringComparison comparison)
{
	var stringBuilder = new StringBuilder();
	var lastIndex = 0;
	var currIndex = input.IndexOf(search, comparison);
	while (currIndex != -1)
	{
		stringBuilder.Append(input.Substring(lastIndex, currIndex - lastIndex));
		stringBuilder.Append(replace);
		currIndex += search.Length;
		lastIndex = currIndex;
		currIndex = input.IndexOf(search, currIndex, comparison);
	}
	stringBuilder.Append(input.Substring(lastIndex));
	return stringBuilder.ToString();
}

Sample VB.NET

Public Shared Function ReplaceWithStringComparison(input As String, search As String, replace As String, comparison As StringComparison) As String
	Dim stringBuilder = New StringBuilder()
	Dim lastIndex = 0
	Dim currIndex = input.IndexOf(search, comparison)
	While currIndex <> -1
		stringBuilder.Append(input.Substring(lastIndex, currIndex - lastIndex))
		stringBuilder.Append(replace)
		currIndex += search.Length
		lastIndex = currIndex
		currIndex = input.IndexOf(search, currIndex, comparison)
	End While
	stringBuilder.Append(input.Substring(lastIndex))
	Return stringBuilder.ToString()
End Function

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