CompareInfo.IsPrefix Method (String, String, CompareOptions)

Parameters

• source
  Type: System.String
  The string to search in.

• prefix
  Type: System.String
  The string to compare with the beginning of source.

• options
  Type: System.Globalization.CompareOptions
  The CompareOptions value that defines how source and prefix should be compared. options is either the value Ordinal used by itself, or the bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Return Value

Type: System.Boolean
true if the length of prefix is less than or equal to the length of source and source starts with prefix; otherwise, false.

Imports System.Globalization

Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      ' Defines the strings to compare.
      Dim myStr1 As [String] = "calle"
      Dim myStr2 As [String] = "llegar"
      Dim myXfix As [String] = "LLE"

      ' Uses the CompareInfo property of the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      outputBlock.Text += String.Format("IsSuffix ""{0}"", ""{1}""", myStr1, myXfix) & vbCrLf
      outputBlock.Text += String.Format("   With no CompareOptions            : {0}", myComp.IsSuffix(myStr1, myXfix)) & vbCrLf
      outputBlock.Text += String.Format("   With None                         : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.None)) & vbCrLf
      outputBlock.Text += String.Format("   With Ordinal                      : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.Ordinal)) & vbCrLf
      outputBlock.Text += String.Format("   With IgnoreCase                   : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.IgnoreCase)) & vbCrLf

      outputBlock.Text += String.Format("IsPrefix ""{0}"", ""{1}""", myStr2, myXfix) & vbCrLf
      outputBlock.Text += String.Format("   With no CompareOptions            : {0}", myComp.IsPrefix(myStr2, myXfix)) & vbCrLf
      outputBlock.Text += String.Format("   With None                         : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.None)) & vbCrLf
      outputBlock.Text += String.Format("   With Ordinal                      : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.Ordinal)) & vbCrLf
      outputBlock.Text += String.Format("   With IgnoreCase                   : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.IgnoreCase)) & vbCrLf

   End Sub 'Main 

End Class 'SamplesCompareInfo


'This code produces the following output.
'
'IsSuffix "calle", "LLE"
'   With no CompareOptions            : False
'   With None                         : False
'   With Ordinal                      : False
'   With IgnoreCase                   : True
'IsPrefix "llegar", "LLE"
'   With no CompareOptions            : False
'   With None                         : False
'   With Ordinal                      : False
'   With IgnoreCase                   : True

using System;
using System.Globalization;

public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // Defines the strings to compare.
      String myStr1 = "calle";
      String myStr2 = "llegar";
      String myXfix = "LLE";

      // Uses the CompareInfo property of the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      outputBlock.Text += String.Format("IsSuffix \"{0}\", \"{1}\"", myStr1, myXfix) + "\n";
      outputBlock.Text += String.Format("   With no CompareOptions            : {0}", myComp.IsSuffix(myStr1, myXfix)) + "\n";
      outputBlock.Text += String.Format("   With None                         : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.None)) + "\n";
      outputBlock.Text += String.Format("   With Ordinal                      : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.Ordinal)) + "\n";
      outputBlock.Text += String.Format("   With IgnoreCase                   : {0}", myComp.IsSuffix(myStr1, myXfix, CompareOptions.IgnoreCase)) + "\n";

      outputBlock.Text += String.Format("IsPrefix \"{0}\", \"{1}\"", myStr2, myXfix) + "\n";
      outputBlock.Text += String.Format("   With no CompareOptions            : {0}", myComp.IsPrefix(myStr2, myXfix)) + "\n";
      outputBlock.Text += String.Format("   With None                         : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.None)) + "\n";
      outputBlock.Text += String.Format("   With Ordinal                      : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.Ordinal)) + "\n";
      outputBlock.Text += String.Format("   With IgnoreCase                   : {0}", myComp.IsPrefix(myStr2, myXfix, CompareOptions.IgnoreCase)) + "\n";

   }

}


/*
This code produces the following output.

IsSuffix "calle", "LLE"
   With no CompareOptions            : False
   With None                         : False
   With Ordinal                      : False
   With IgnoreCase                   : True
IsPrefix "llegar", "LLE"
   With no CompareOptions            : False
   With None                         : False
   With Ordinal                      : False
   With IgnoreCase                   : True

*/