StringBuilder。C# 中的复制方法

原文:https://www . geeksforgeeks . org/stringbuilder-copy to-method-in-c-sharp/

此方法用于将字符从该实例的指定段复制到目标字符数组的指定段。

语法:

public see copy to(int source index、char[] destination、int destinationIndex、int count)；

参数:

  • 源索引:这是这个实例中复制字符的起始位置。索引从零开始。
  • 目的地:是复制字符的数组。
  • 目的地索引:目的地中复制字符的起始位置。索引从零开始。
  • 计数:是需要复制的字符数。

异常:

  • 参数空异常:如果目的地为空。
  • ArgumentOutOfRangeException:如果源索引、目的索引或计数小于零或源索引大于此实例的长度。
  • 参数异常:如果源索引+计数大于此实例的长度或者目的地索引+计数大于目的地的长度。

例 1:

// C# program to illustrate the
// CopyTo () StringBuilder Method
using System;
using System.Text;

class Geeks {

    // Main Method
    public static void Main()
    {
        // create a StringBuilder object
        // with a String pass as parameter
        StringBuilder str
            = new StringBuilder("GeeksForGeeks");

        char[] dest = new char[15];

        // str index 5 to 5+3 has to
        // copy into Copystring
        // 3 is no. of character
        // 0 is start index of Copystring
        str.CopyTo(5, dest, 0, 3);

        // Displaying String
        Console.Write("The Copied String in "+
                        "dest Variable is: ");
        Console.WriteLine(dest);
    }
}

Output:

The Copied String in dest Variable is: For

例 2:

// C# program to illustrate the
// CopyTo() StringBuilder Method
using System;
using System.Text;

class Geeks {

    // Main Method
    public static void Main()
    {
        // create a StringBuilder object
        // with a String pass as parameter
        StringBuilder str2
            = new StringBuilder("GeeksForGeeks");

        char[] dest = { 'H', 'e', 'l', 'l', 'o', ' ',
                           'W', 'o', 'r', 'l', 'd' };

        // str index 8 to 8 + 5 has
        // to copy into Copystring
        // 5 is no of character
        // 6 is start index of Copystring
        str2.CopyTo(8, dest, 6, 5);

        // Displaying the result
        Console.Write("String Copied in dest is: ");
        Console.WriteLine(dest);
    }
}

Output:

String Copied in dest is: Hello Geeks

参考:

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