String.Remove 方法

定义

返回一个新字符串,它相当于从当前字符串删除了指定数量的字符。

重载

Remove(Int32, Int32)

返回指定数量字符在当前这个实例起始点在已删除的指定的位置的新字符串。

Remove(Int32)

返回当前实例中从指定位置到最后位置的所有以删除的字符的新字符串。

Remove(Int32, Int32)

返回指定数量字符在当前这个实例起始点在已删除的指定的位置的新字符串。

public:
 System::String ^ Remove(int startIndex, int count);
public string Remove (int startIndex, int count);
member this.Remove : int * int -> string
Public Function Remove (startIndex As Integer, count As Integer) As String

参数

startIndex
Int32

开始删除字符的从零开始的位置。

count
Int32

要删除的字符数。

返回

String

一个新字符串,除所删除的字符之外,该字符串与此实例等效。

例外

startIndexcount 小于零。

- 或 -

startIndexcount 指定此实例之外的位置。

示例

以下示例演示如何从完整名称中删除中间名。

using namespace System;
int main()
{
   String^ name = "Michelle Violet Banks";
   Console::WriteLine( "The entire name is '{0}'", name );
   
   // remove the middle name, identified by finding the spaces in the middle of the name->->.
   int foundS1 = name->IndexOf( " " );
   int foundS2 = name->IndexOf( " ", foundS1 + 1 );
   if ( foundS1 != foundS2 && foundS1 >= 0 )
   {
      name = name->Remove( foundS1 + 1, foundS2 - foundS1 );
      Console::WriteLine( "After removing the middle name, we are left with '{0}'", name );
   }
}
// The example displays the following output:
//       The entire name is 'Michelle Violet Banks'
//       After removing the middle name, we are left with 'Michelle Banks'
using System;

public class RemoveTest
{
    public static void Main()
    {

        string name = "Michelle Violet Banks";

        Console.WriteLine("The entire name is '{0}'", name);

        // Remove the middle name, identified by finding the spaces in the name.
        int foundS1 = name.IndexOf(" ");
        int foundS2 = name.IndexOf(" ", foundS1 + 1);

        if (foundS1 != foundS2 && foundS1 >= 0)
        {
            name = name.Remove(foundS1 + 1, foundS2 - foundS1);

            Console.WriteLine("After removing the middle name, we are left with '{0}'", name);
        }
    }
}
// The example displays the following output:
//       The entire name is 'Michelle Violet Banks'
//       After removing the middle name, we are left with 'Michelle Banks'
let name = "Michelle Violet Banks"

printfn $"The entire name is '{name}'"

// Remove the middle name, identified by finding the spaces in the name.
let foundS1 = name.IndexOf " "
let foundS2 = name.IndexOf(" ", foundS1 + 1)

if foundS1 <> foundS2 && foundS1 >= 0 then
    let name = name.Remove(foundS1 + 1, foundS2 - foundS1)

    printfn $"After removing the middle name, we are left with '{name}'"
// The example displays the following output:
//       The entire name is 'Michelle Violet Banks'
//       After removing the middle name, we are left with 'Michelle Banks'
Public Class RemoveTest
    
    Public Shared Sub Main()
        Dim name As String = "Michelle Violet Banks"
                
        Console.WriteLine("The entire name is '{0}'", name)
        Dim foundS1 As Integer = name.IndexOf(" ")
        Dim foundS2 As Integer = name.IndexOf(" ", foundS1 + 1)
        If foundS1 <> foundS2 And foundS1 >= 0 Then
            
            ' remove the middle name, identified by finding the spaces in the middle of the name...    
            name = name.Remove(foundS1 + 1, foundS2 - foundS1)
            
            Console.WriteLine("After removing the middle name, we are left with '{0}'", name)
        End If
    End Sub
End Class 
' The example displays the following output:
'       The entire name is 'Michelle Violet Banks'
'       After removing the middle name, we are left with 'Michelle Banks'

注解

在.NET Framework中,字符串从零开始。 参数的值 startIndex 的范围可以是 0 到 1 比字符串实例的长度少 1。

备注

此方法不修改当前实例的值。 相反,它返回一个新字符串,其中参数指定的 count 字符数已被删除。 在 指定 startIndex的位置删除字符。

另请参阅

适用于

Remove(Int32)

返回当前实例中从指定位置到最后位置的所有以删除的字符的新字符串。

public:
 System::String ^ Remove(int startIndex);
public string Remove (int startIndex);
member this.Remove : int -> string
Public Function Remove (startIndex As Integer) As String

参数

startIndex
Int32

开始删除字符的从零开始的位置。

返回

String

一个新字符串,除所删除的字符之外,该字符串与此字符串等效。

例外

startIndex 小于零。

- 或 -

startIndex 指定不在此字符串中的位置。

示例

下面的示例演示 Remove 方法。 紧接着最后一个大小写将删除从指定索引开始到字符串末尾的所有文本。 最后一个大小写删除从指定索引开始的三个字符。

// This example demonstrates the String.Remove() method.
using namespace System;
int main()
{
   String^ s = "abc---def";
   
   //
   Console::WriteLine( "Index: 012345678" );
   Console::WriteLine( "1)     {0}", s );
   Console::WriteLine( "2)     {0}", s->Remove( 3 ) );
   Console::WriteLine( "3)     {0}", s->Remove( 3, 3 ) );
}

/*
This example produces the following results:

Index: 012345678
1)     abc---def
2)     abc
3)     abcdef

*/
// This example demonstrates the String.Remove() method.
using System;

class Sample
{
    public static void Main()
    {
        string s = "abc---def";

        Console.WriteLine("Index: 012345678");
        Console.WriteLine("1)     {0}", s);
        Console.WriteLine("2)     {0}", s.Remove(3));
        Console.WriteLine("3)     {0}", s.Remove(3, 3));
    }
}
/*
This example produces the following results:

Index: 012345678
1)     abc---def
2)     abc
3)     abcdef

*/
// This example demonstrates the String.Remove() method.
let s = "abc---def"

printfn "Index: 012345678"
printfn $"1)     {s}"
printfn $"2)     {s.Remove 3}"
printfn $"3)     {s.Remove(3, 3)}"
(*
This example produces the following results:

Index: 012345678
1)     abc---def
2)     abc
3)     abcdef

*)
' This example demonstrates the String.Remove() method.
Class Sample
   Public Shared Sub Main()
      Dim s As String = "abc---def"
      '
      Console.WriteLine("Index: 012345678")
      Console.WriteLine("1)     {0}", s)
      Console.WriteLine("2)     {0}", s.Remove(3))
      Console.WriteLine("3)     {0}", s.Remove(3, 3))
   End Sub
End Class
'
'This example produces the following results:
'
'Index: 012345678
'1)     abc---def
'2)     abc
'3)     abcdef
'

注解

在.NET Framework中,字符串从零开始。 参数的值 startIndex 的范围可以是 0 到 1 比字符串实例的长度少 1。

备注

此方法不修改当前实例的值。 而是返回一个新字符串,其中从位置 startIndex 到原始字符串末尾的所有字符都已删除。

另请参阅

适用于