String.Equals Method (String, String)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Determines whether two specified String objects have the same value.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function Equals ( _
a As String, _
b As String _
) As Boolean
public static bool Equals(
string a,
string b
)
Parameters
- a
Type: System.String
The first string to compare, or nulla null reference (Nothing in Visual Basic).
- b
Type: System.String
The second string to compare, or nulla null reference (Nothing in Visual Basic).
Return Value
Type: System.Boolean
true if the value of a is the same as the value of b; otherwise, false. If both a and b are nulla null reference (Nothing in Visual Basic), the method returns true.
Remarks
This method performs an ordinal (case-sensitive and culture-insensitive) comparison.
Examples
The following code example demonstrates the Equals method.
' Sample for String.Equals(Object)
' String.Equals(String)
' String.Equals(String, String)
Imports System.Text
Class Example
Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim sb As New StringBuilder("abcd")
Dim str1 As [String] = "abcd"
Dim str2 As [String] = Nothing
Dim o2 As [Object] = Nothing
outputBlock.Text &= vbCrLf
outputBlock.Text += String.Format(" * The value of String str1 is '{0}'.", str1) & vbCrLf
outputBlock.Text += String.Format(" * The value of StringBuilder sb is '{0}'.", sb.ToString()) & vbCrLf
outputBlock.Text &= vbCrLf
outputBlock.Text += String.Format("1a) String.Equals(Object). Object is a StringBuilder, not a String.") & vbCrLf
outputBlock.Text += String.Format(" Is str1 equal to sb?: {0}", str1.Equals(sb)) & vbCrLf
outputBlock.Text &= vbCrLf
outputBlock.Text &= "1b) String.Equals(Object). Object is a String." & vbCrLf
str2 = sb.ToString()
o2 = str2
outputBlock.Text += String.Format(" * The value of Object o2 is '{0}'.", o2) & vbCrLf
outputBlock.Text += String.Format(" Is str1 equal to o2?: {0}", str1.Equals(o2)) & vbCrLf
outputBlock.Text &= vbCrLf
outputBlock.Text &= " 2) String.Equals(String)" & vbCrLf
outputBlock.Text += String.Format(" * The value of String str2 is '{0}'.", str2) & vbCrLf
outputBlock.Text += String.Format(" Is str1 equal to str2?: {0}", str1.Equals(str2)) & vbCrLf
outputBlock.Text &= vbCrLf
outputBlock.Text += String.Format(" 3) String.Equals(String, String)") & vbCrLf
outputBlock.Text += String.Format(" Is str1 equal to str2?: {0}", [String].Equals(str1, str2)) & vbCrLf
End Sub 'Main
End Class 'Sample
'
'This example produces the following results:
'
' * The value of String str1 is 'abcd'.
' * The value of StringBuilder sb is 'abcd'.
'
'1a) String.Equals(Object). Object is a StringBuilder, not a String.
' Is str1 equal to sb?: False
'
'1b) String.Equals(Object). Object is a String.
' * The value of Object o2 is 'abcd'.
' Is str1 equal to o2?: True
'
' 2) String.Equals(String)
' * The value of String str2 is 'abcd'.
' Is str1 equal to str2?: True
'
' 3) String.Equals(String, String)
' Is str1 equal to str2?: True
'
// Sample for String.Equals(Object)
// String.Equals(String)
// String.Equals(String, String)
using System;
using System.Text;
class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
StringBuilder sb = new StringBuilder("abcd");
String str1 = "abcd";
String str2 = null;
Object o2 = null;
outputBlock.Text += "\n";
outputBlock.Text += String.Format(" * The value of String str1 is '{0}'.", str1) + "\n";
outputBlock.Text += String.Format(" * The value of StringBuilder sb is '{0}'.", sb.ToString()) + "\n";
outputBlock.Text += "\n";
outputBlock.Text += String.Format("1a) String.Equals(Object). Object is a StringBuilder, not a String.") + "\n";
outputBlock.Text += String.Format(" Is str1 equal to sb?: {0}", str1.Equals(sb)) + "\n";
outputBlock.Text += "\n";
outputBlock.Text += "1b) String.Equals(Object). Object is a String." + "\n";
str2 = sb.ToString();
o2 = str2;
outputBlock.Text += String.Format(" * The value of Object o2 is '{0}'.", o2) + "\n";
outputBlock.Text += String.Format(" Is str1 equal to o2?: {0}", str1.Equals(o2)) + "\n";
outputBlock.Text += "\n";
outputBlock.Text += " 2) String.Equals(String)" + "\n";
outputBlock.Text += String.Format(" * The value of String str2 is '{0}'.", str2) + "\n";
outputBlock.Text += String.Format(" Is str1 equal to str2?: {0}", str1.Equals(str2)) + "\n";
outputBlock.Text += "\n";
outputBlock.Text += String.Format(" 3) String.Equals(String, String)") + "\n";
outputBlock.Text += String.Format(" Is str1 equal to str2?: {0}", String.Equals(str1, str2)) + "\n";
}
}
/*
This example produces the following results:
* The value of String str1 is 'abcd'.
* The value of StringBuilder sb is 'abcd'.
1a) String.Equals(Object). Object is a StringBuilder, not a String.
Is str1 equal to sb?: False
1b) String.Equals(Object). Object is a String.
* The value of Object o2 is 'abcd'.
Is str1 equal to o2?: True
2) String.Equals(String)
* The value of String str2 is 'abcd'.
Is str1 equal to str2?: True
3) String.Equals(String, String)
Is str1 equal to str2?: True
*/
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.