String.GetHashCode Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Returns the hash code for this string.
Assembly: mscorlib (in mscorlib.dll)
The behavior of GetHashCode is dependent on its implementation, which might change from one version of the common language runtime to another. A reason why this might happen is to improve the performance of GetHashCode.
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If two string objects are equal, the GetHashCode method returns identical values. However, there is not a unique hash code value for each unique string value. Different strings can return the same hash code. For more information about hash codes, see the Object.GetHashCode reference topic. |
The following code example demonstrates the GetHashCode method using various input strings.
// Example for the String.GetHashCode( ) method. using System; class Example { public static void Demo(System.Windows.Controls.TextBlock outputBlock) { outputBlock.Text += "This example of String.GetHashCode() " + "generates the following output.\n" + "\n"; DisplayHashCode(outputBlock, ""); DisplayHashCode(outputBlock, "a"); DisplayHashCode(outputBlock, "ab"); DisplayHashCode(outputBlock, "abc"); DisplayHashCode(outputBlock, "abd"); DisplayHashCode(outputBlock, "abe"); DisplayHashCode(outputBlock, "abcdef"); DisplayHashCode(outputBlock, "abcdeg"); DisplayHashCode(outputBlock, "abcdeh"); DisplayHashCode(outputBlock, "abcdei"); DisplayHashCode(outputBlock, "Abcdeg"); DisplayHashCode(outputBlock, "Abcdeh"); DisplayHashCode(outputBlock, "Abcdei"); } static void DisplayHashCode(System.Windows.Controls.TextBlock outputBlock, String Operand) { int HashCode = Operand.GetHashCode(); outputBlock.Text += String.Format( "The hash code for \"{0}\" is: 0x{1:X8}, {1}", Operand, HashCode) + "\n"; } } /* This example of String.GetHashCode( ) generates the following output. The hash code for "" is: 0x00001505, 5381 The hash code for "a" is: 0x0002B5C4, 177604 The hash code for "ab" is: 0x00596E26, 5860902 The hash code for "abc" is: 0x0B873285, 193409669 The hash code for "abd" is: 0x0B873282, 193409666 The hash code for "abe" is: 0x0B873283, 193409667 The hash code for "abcdef" is: 0x4DDB4BE2, 1306217442 The hash code for "abcdeg" is: 0x4DDB4BE3, 1306217443 The hash code for "abcdeh" is: 0x4DDB4BEC, 1306217452 The hash code for "abcdei" is: 0x4DDB4BED, 1306217453 The hash code for "Abcdeg" is: 0x941C4FC3, -1810083901 The hash code for "Abcdeh" is: 0x941C4FCC, -1810083892 The hash code for "Abcdei" is: 0x941C4FCD, -1810083891 */
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