Comparer.Compare(Object, Object) 方法

public:
 virtual int Compare(System::Object ^ a, System::Object ^ b);

public int Compare(object a, object b);

public int Compare(object? a, object? b);

abstract member Compare : obj * obj -> int
override this.Compare : obj * obj -> int

Public Function Compare (a As Object, b As Object) As Integer

參數

傳回

一個有符號整數，表示 和 a的b相對值，如下表所示。

實作

例外狀況

範例

以下程式碼範例展示了如何 Compare 根據與 相關 Comparer文化而回傳不同的值。

using System;
using System.Collections;
using System.Globalization;

public class SamplesComparer  {

   public static void Main()  {

      // Creates the strings to compare.
      String str1 = "llegar";
      String str2 = "lugar";
      Console.WriteLine( "Comparing \"{0}\" and \"{1}\" ...", str1, str2 );

      // Uses the DefaultInvariant Comparer.
      Console.WriteLine( "   Invariant Comparer: {0}", Comparer.DefaultInvariant.Compare( str1, str2 ) );

      // Uses the Comparer based on the culture "es-ES" (Spanish - Spain, international sort).
      Comparer myCompIntl = new Comparer( new CultureInfo( "es-ES", false ) );
      Console.WriteLine( "   International Sort: {0}", myCompIntl.Compare( str1, str2 ) );

      // Uses the Comparer based on the culture identifier 0x040A (Spanish - Spain, traditional sort).
      Comparer myCompTrad = new Comparer( new CultureInfo( 0x040A, false ) );
      Console.WriteLine( "   Traditional Sort  : {0}", myCompTrad.Compare( str1, str2 ) );
   }
}

/*
This code produces the following output.

Comparing "llegar" and "lugar" ...
   Invariant Comparer: -1
   International Sort: -1
   Traditional Sort  : 1

*/

Imports System.Collections
Imports System.Globalization

Public Class SamplesComparer

   Public Shared Sub Main()

      ' Creates the strings to compare.
      Dim str1 As [String] = "llegar"
      Dim str2 As [String] = "lugar"
      Console.WriteLine("Comparing ""{0}"" and ""{1}"" ...", str1, str2)

      ' Uses the DefaultInvariant Comparer.
      Console.WriteLine("   Invariant Comparer: {0}", Comparer.DefaultInvariant.Compare(str1, str2))

      ' Uses the Comparer based on the culture "es-ES" (Spanish - Spain, international sort).
      Dim myCompIntl As New Comparer(New CultureInfo("es-ES", False))
      Console.WriteLine("   International Sort: {0}", myCompIntl.Compare(str1, str2))

      ' Uses the Comparer based on the culture identifier 0x040A (Spanish - Spain, traditional sort).
      Dim myCompTrad As New Comparer(New CultureInfo(&H40A, False))
      Console.WriteLine("   Traditional Sort  : {0}", myCompTrad.Compare(str1, str2))

   End Sub

End Class


'This code produces the following output.
'
'Comparing "llegar" and "lugar" ...
'   Invariant Comparer: -1
'   International Sort: -1
'   Traditional Sort  : 1

備註

若 a 實現 IComparable，則 a。 CompareTo b（） 返回;否則，若 b 實現 IComparable，則 的b否定結果。 CompareTo a（）被退回。

允許與任意型別比較 null ，且在使用 IComparable時不會產生例外。 排序時， null 被視為比其他任何物件都小。

弦比對可能因文化不同而有不同的結果。 欲了解更多文化特定比較資訊，請參閱 System.Globalization 命名空間及 全球化與在地化。

另請參閱

• IComparable
• CompareInfo
• CurrentCulture
• CultureInfo