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c#copyto_String.CopyTo（）方法以及C＃中的示例

ds 2025/8/11 18:51:44

c#copyto

C＃String.CopyTo()方法 (C# String.CopyTo() Method)

String.CopyTo() method is used to copy a specified number of characters from given indexes of the string to the specified position in a character array.

String.CopyTo()方法用于将指定数量的字符从给定的字符串索引复制到字符数组中的指定位置。

Syntax:

句法：

    public void CopyTo (int source_index, 
char[] destination, 
int destination_index, 
int count);

Parameter:

参数：

source_index - index to the string from where you want to copy the string
source_index-要从中复制字符串的字符串的索引
destination - target character array in which you want to copy the part of the string
destination-您要在其中复制字符串部分的目标字符数组
destination_index - index in the targeted character array
destination_index-目标字符数组中的索引
count - total number of characters to be copied in character array
count-要在字符数组中复制的字符总数

Return value: void - It returns nothing.

返回值： void-不返回任何内容。

Example:

例：

    Input:
string str = "Hello world!";
char[] arr = { 'I', 'n', 'c', 'l', 'u', 'd', 'H', 'e', 'l', 'p' };
copying "Hello " to arr:
str.CopyTo(0, arr, 0, 6);
Output:
str = Hello world!
arr = Hello Help

C＃使用String.CopyTo()方法将字符从字符串复制到字符数组的示例 (C# Example to copy a characters from string to characters array using String.CopyTo() method)

using System;
using System.Text;
namespace Test
{
class Program
{
static void printCharArray(char[] a){
foreach (char item in a)
{
Console.Write(item);
}
}
static void Main(string[] args)
{
string str = "Hello world!";
char[] arr = { 'I', 'n', 'c', 'l', 'u', 'd', 'H', 'e', 'l', 'p' };
//printing values
Console.WriteLine("Before CopyTo...");
Console.WriteLine("str = " + str);
Console.Write("arr = ");
printCharArray(arr);
Console.WriteLine();
//copying "Hello " to arr
str.CopyTo(0, arr, 0, 6);
//printing values
Console.WriteLine("After CopyTo 1)...");
Console.WriteLine("str = " + str);
Console.Write("arr = ");
printCharArray(arr);
Console.WriteLine();
//copying "World! " to arr
str.CopyTo(6, arr, 0, 6);
//printing values
Console.WriteLine("After CopyTo 1)...");
Console.WriteLine("str = " + str);
Console.Write("arr = ");
printCharArray(arr);
Console.WriteLine();
//hit ENTER to exit
Console.ReadLine();
}
}
}

Output

输出量

Before CopyTo...
str = Hello world!
arr = IncludHelp
After CopyTo 1)...
str = Hello world!
arr = Hello Help
After CopyTo 1)...
str = Hello world!
arr = world!Help

Reference: String.CopyTo(Int32, Char[], Int32, Int32) Method

参考： String.CopyTo(Int32，Char []，Int32，Int32)方法