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()方法用于將指定數量的字符從給定的字符串索引復制到字符數組中的指定位置。

Syntax:

句法：

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

Parameter:

參數：

• source_index - index to the string from where you want to copy the string

  source_index-要從中復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-您要在其中復制字符串部分的目標字符數組

• destination_index - index in the targeted character array

  destination_index-目標字符數組中的索引

• count - total number of characters to be copied in character array

  count-要在字符數組中復制的字符總數

Return value: void - It returns nothing.

返回值： void-不返回任何內容。

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()方法將字符從字符串復制到字符數組的示例 (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

輸出量

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

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

翻譯自: https://www.includehelp.com/dot-net/string-copyto-method-with-example-in-c-sharp.aspx

c#copyto