String.IComparable.CompareTo(Object) 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

将此实例与指定的 Object 进行比较，并指示此实例在排序顺序中是位于指定的 Object 之前、之后还是与其出现在同一位置。

 virtual int System.IComparable.CompareTo(System::Object ^ value) = IComparable::CompareTo;

int IComparable.CompareTo (object value);

abstract member System.IComparable.CompareTo : obj -> int
override this.System.IComparable.CompareTo : obj -> int

Function CompareTo (value As Object) As Integer Implements IComparable.CompareTo

参数

value

Object

一个对象，其计算结果为 String。

返回

Int32

一个 32 位带符号整数，该整数指示此实例在排序顺序中是位于 value 参数之前、之后还是与其出现在同一位置。

“值”	条件
小于零	此实例位于 value 之前。
零	此实例在排序顺序中的位置与 value 相同。
大于零	此实例位于 value 之后，或 value 为 null。

实现

CompareTo(Object)

例外

ArgumentException

value 不是 String。

示例

以下示例将 方法与 一 CompareTo 起使用 Object。 由于它尝试将 实例与 对象进行比较String，因此 该方法会引发 ArgumentException。TestClass

using namespace System;

public ref class TestClass{};

int main()
{
   TestClass^ test = gcnew TestClass;
   array<Object^>^ objectsToCompare = { test, test->ToString(), 123,
                                        (123).ToString(), "some text",
                                        "Some Text" };
   String^ s = "some text";
   for each (Object^ objectToCompare in objectsToCompare) {
      try {
         Int32 i = s->CompareTo(objectToCompare);
         Console::WriteLine("Comparing '{0}' with '{1}': {2}",
                            s, objectToCompare, i);
      }
      catch (ArgumentException^ e) {
         Console::WriteLine("Bad argument: {0} (type {1})",
                            objectToCompare,
                            objectToCompare->GetType()->Name);
      }
   }
}
// The example displays the following output:
//    Bad argument: TestClass (type TestClass)
//    Comparing 'some text' with 'TestClass': -1
//    Bad argument: 123 (type Int32)
//    Comparing 'some text' with '123': 1
//    Comparing 'some text' with 'some text': 0
//    Comparing 'some text' with 'Some Text': -1

using System;

public class TestClass
{}

public class Example
{
   public static void Main()
   {
      var test = new TestClass();
      Object[] objectsToCompare = { test, test.ToString(), 123,
                                    123.ToString(), "some text",
                                    "Some Text" };
      string s = "some text";
      foreach (var objectToCompare in objectsToCompare) {
         try {
            int i = s.CompareTo(objectToCompare);
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i);
         }
         catch (ArgumentException) {
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name);
         }
      }
   }
}
// The example displays the following output:
//    Bad argument: TestClass (type TestClass)
//    Comparing 'some text' with 'TestClass': -1
//    Bad argument: 123 (type Int32)
//    Comparing 'some text' with '123': 1
//    Comparing 'some text' with 'some text': 0
//    Comparing 'some text' with 'Some Text': -1

open System

type TestClass() = class end

let test = TestClass()
let objectsToCompare: obj list =
    [ test; string test; 123
      string 123; "some text"
      "Some Text" ]
let s = "some text"
for objectToCompare in objectsToCompare do
    try
        let i = s.CompareTo objectToCompare
        printfn $"Comparing '{s}' with '{objectToCompare}': {i}"
    with :? ArgumentException ->
        printfn $"Bad argument: {objectToCompare} (type {objectToCompare.GetType().Name})"
// The example displays the following output:
//    Bad argument: TestClass (type TestClass)
//    Comparing 'some text' with 'TestClass': -1
//    Bad argument: 123 (type Int32)
//    Comparing 'some text' with '123': 1
//    Comparing 'some text' with 'some text': 0
//    Comparing 'some text' with 'Some Text': -1

Public Class TestClass
End Class 


Public Class Example
   Public Shared Sub Main()
      Dim test As New TestClass()
      Dim objectsToCompare() As Object = { test, test.ToString(), 123,
                                           123.ToString(), "some text",
                                           "Some Text" }
      Dim s As String = "some text"
      For Each objectToCompare In objectsToCompare
         Try
            Dim i As Integer = s.CompareTo(objectToCompare)
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i)
         Catch e As ArgumentException
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name)
         End Try
      Next
   End Sub 
End Class 
' The example displays the following output:
'       Bad argument: TestClass (type TestClass)
'       Comparing 'some text' with 'TestClass': -1
'       Bad argument: 123 (type Int32)
'       Comparing 'some text' with '123': 1
'       Comparing 'some text' with 'some text': 0
'       Comparing 'some text' with 'Some Text': -1

注解

value 必须是 对象 String 。

注意

方法 CompareTo 主要用于排序或按字母顺序排列操作。 当方法调用的主要目的是确定两个字符串是否等效时，不应使用它。 若要确定两个字符串是否等效，请调用 Equals 方法。

此方法使用当前区域性执行单词 (区分大小写和区分区域性) 比较。 有关单词、字符串和序号排序的详细信息，请参阅 System.Globalization.CompareOptions。

有关此方法的行为的详细信息，请参阅 方法的 String.Compare(String, String) “备注”部分。