String.Insert(Int32, String) 方法
定义
重要
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返回一个新字符串，在此实例的指定索引位置插入指定的字符串。
public:
System::String ^ Insert(int startIndex, System::String ^ value);public string Insert(int startIndex, string value);member this.Insert : int * string -> stringPublic Function Insert (startIndex As Integer, value As String) As String参数
- startIndex
- Int32
插入的从零开始的索引位置。
- value
- String
要插入的字符串。
返回
等效于此实例的新字符串，但 value 插入位置 startIndex。
例外
value 是 null。
startIndex 为负数或大于此实例的长度。
示例
以下示例在字符串的第四个字符位置（索引 3 处的字符）中插入空格字符。
using System;
public class Example
{
public static void Main()
{
String original = "aaabbb";
Console.WriteLine("The original string: '{0}'", original);
String modified = original.Insert(3, " ");
Console.WriteLine("The modified string: '{0}'", modified);
}
}
// The example displays the following output:
// The original string: 'aaabbb'
// The modified string: 'aaa bbb'
let original = "aaabbb"
printfn $"The original string: '{original}'"
let modified = original.Insert(3, " ")
printfn $"The modified string: '{modified}'"
// The example displays the following output:
// The original string: 'aaabbb'
// The modified string: 'aaa bbb'
Public Module Example
Public Sub Main()
Dim original As String = "aaabbb"
Console.WriteLine("The original string: '{0}'", original)
Dim modified As String = original.Insert(3, " ")
Console.WriteLine("The modified string: '{0}'", modified)
End Sub
End Module
' The example displays the following output:
' The original string: 'aaabbb'
' The modified string: 'aaa bbb'
以下控制台应用程序提示用户输入一个或多个形容词来描述两种动物。 然后，它会调用 Insert 该方法，将用户输入的文本插入字符串中。
using System;
public class Example {
public static void Main()
{
string animal1 = "fox";
string animal2 = "dog";
string strTarget = String.Format("The {0} jumps over the {1}.",
animal1, animal2);
Console.WriteLine("The original string is:{0}{1}{0}",
Environment.NewLine, strTarget);
Console.Write("Enter an adjective (or group of adjectives) " +
"to describe the {0}: ==> ", animal1);
string adj1 = Console.ReadLine();
Console.Write("Enter an adjective (or group of adjectives) " +
"to describe the {0}: ==> ", animal2);
string adj2 = Console.ReadLine();
adj1 = adj1.Trim() + " ";
adj2 = adj2.Trim() + " ";
strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1);
strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2);
Console.WriteLine("{0}The final string is:{0}{1}",
Environment.NewLine, strTarget);
}
}
// Output from the example might appear as follows:
// The original string is:
// The fox jumps over the dog.
//
// Enter an adjective (or group of adjectives) to describe the fox: ==> bold
// Enter an adjective (or group of adjectives) to describe the dog: ==> lazy
//
// The final string is:
// The bold fox jumps over the lazy dog.
open System
let animal1 = "fox"
let animal2 = "dog"
let strTarget = String.Format("The {0} jumps over the {1}.", animal1, animal2)
do
printfn $"The original string is:{Environment.NewLine}{strTarget}{Environment.NewLine}"
printf $"Enter an adjective (or group of adjectives) to describe the {animal1}: => "
let adj1 = stdin.ReadLine()
printf $"Enter an adjective (or group of adjectives) to describe the {animal2}: => "
let adj2 = stdin.ReadLine()
let adj1 = adj1.Trim() + " "
let adj2 = adj2.Trim() + " "
let strTarget = strTarget.Insert(strTarget.IndexOf animal1, adj1)
let strTarget = strTarget.Insert(strTarget.IndexOf animal2, adj2)
printfn $"{Environment.NewLine}The final string is:{strTarget}{Environment.NewLine}"
// Output from the example might appear as follows:
// The original string is:
// The fox jumps over the dog.
//
// Enter an adjective (or group of adjectives) to describe the fox: => bold
// Enter an adjective (or group of adjectives) to describe the dog: => lazy
//
// The final string is:
// The bold fox jumps over the lazy dog.
Public Class Example
Public Shared Sub Main()
Dim animal1 As String = "fox"
Dim animal2 As String = "dog"
Dim strTarget As String = String.Format("The {0} jumps over the {1}.",
animal1, animal2)
Console.WriteLine("The original string is: {0}{1}{0}",
Environment.NewLine, strTarget)
Console.Write("Enter an adjective (or group of adjectives) " +
"to describe the {0}: ==> ", animal1)
Dim adj1 As String = Console.ReadLine()
Console.Write("Enter an adjective (or group of adjectives) " +
"to describe the {0}: ==> ", animal2)
Dim adj2 As String = Console.ReadLine()
adj1 = adj1.Trim() + " "
adj2 = adj2.Trim() + " "
strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1)
strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2)
Console.WriteLine("{0}The final string is:{0}{1}",
Environment.NewLine, strTarget)
End Sub
End Class
' Output from the example might appear as follows:
' The original string is:
' The fox jumps over the dog.
'
' Enter an adjective (or group of adjectives) to describe the fox: ==> bold
' Enter an adjective (or group of adjectives) to describe the dog: ==> lazy
'
' The final string is:
' The bold fox jumps over the lazy dog.
注解
如果 startIndex 等于此实例的长度， value 则追加到此实例的末尾。
注释
此方法不会修改当前实例的值。 而是返回插入到当前实例中的新字符串 value 。
例如，返回值为 "abc".Insert(2, "XYZ") “abXYZc”。
