此方法用于将字符从此实例的指定段复制到目标Char数组的指定段。
句法:
public void CopyTo (int sourceIndex, char[] destination, int destinationIndex, int count);
参数:
- sourceIndex :这是从中复制字符的起始位置。索引从零开始。
- destination :这是要复制字符的数组。
- destinationIndex :这是目标中要复制字符的起始位置。索引从零开始。
- count :它是要复制的字符数。
例外情况:
- ArgumentNullException :如果目的地为null。
- ArgumentOutOfRangeException :如果sourceIndex , destinationIndex或count小于零,或者sourceIndex大于此实例的长度。
- ArgumentException :如果sourceIndex + count大于此实例的长度,或者destinationIndex + count大于destination的长度。
范例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);
}
}
输出:
The Copied String in dest Variable is: For
范例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);
}
}
输出:
String Copied in dest is: Hello Geeks
参考:
- https://docs.microsoft.com/zh-cn/dotnet/api/system.text.stringbuilder.copyto?view=netframework-4.7.2