String.Remove 方法

定义

返回一个新字符串,其中从当前字符串中删除指定数量的字符。

重载

名称 说明
Remove(Int32, Int32)

返回一个新字符串,其中从指定位置开始的当前实例中的指定字符数已被删除。

Remove(Int32)

返回一个新字符串,其中当前实例中的所有字符(从指定位置开始并继续执行最后一个位置)已被删除。

Remove(Int32, Int32)

Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs

返回一个新字符串,其中从指定位置开始的当前实例中的指定字符数已被删除。

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

与此实例等效的新字符串,但删除的字符除外。

例外

要么startIndexcount小于零。

-或-

startIndex 加上 count 指定此实例外部的位置。

示例

以下示例演示如何从完整名称中删除中间名称。

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 可以介于零到一个小于字符串实例长度的长度之间。

注释

此方法不会修改当前实例的值。 而是返回一个新字符串,在该字符串中删除了 count 参数指定的字符数。 字符在指定的 startIndex位置删除。

另请参阅

适用于

Remove(Int32)

Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs
Source:
String.Manipulation.cs

返回一个新字符串,其中当前实例中的所有字符(从指定位置开始并继续执行最后一个位置)已被删除。

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

与此字符串等效的新字符串,但删除的字符除外。

例外

startIndex 小于零。

-或-

startIndex 大于此实例的长度。

示例

以下示例演示了该方法 Remove 。 下一个到最后一个大小写删除从指定索引到字符串末尾的所有文本。 最后一个大小写从指定索引开始删除三个字符。

// 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 可以介于零到字符串实例的长度之间。

注释

此方法不会修改当前实例的值。 而是返回一个新字符串,其中所有字符从位置 startIndex 到原始字符串的末尾已被删除。

另请参阅

适用于