如何：向字符串写入字符
更新：2007 年 11 月
下面的代码示例把从字符数组中指定位置开始的一定数目的字符写入现有的字符串。请使用 StringWriter 完成此操作，如下所示。
示例
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Imports System.Text
Public Class CharsToStr
Public Shared Sub Main()
' Create an instance of StringBuilder that can then be modified.
Dim sb As New StringBuilder("Some number of characters")
' Define and create an instance of a character array from which
' characters will be read into the StringBuilder.
Dim b As Char() = {" "c, "t"c, "o"c, " "c, "w"c, "r"c, "i"c, "t"c, "e"c, " "c, "t"c, "o"c, "."c}
' Create an instance of StringWriter
' and attach it to the StringBuilder.
Dim sw As New StringWriter(sb)
' Write three characters from the array into the StringBuilder.
sw.Write(b, 0, 3)
' Display the output.
Console.WriteLine(sb)
' Close the StringWriter.
sw.Close()
End Sub
End Class
using System;
using System.IO;
using System.Text;
public class CharsToStr
{
public static void Main(String[] args)
{
// Create an instance of StringBuilder that can then be modified.
StringBuilder sb = new StringBuilder("Some number of characters");
// Define and create an instance of a character array from which
// characters will be read into the StringBuilder.
char[] b = {' ','t','o',' ','w','r','i','t','e',' ','t','o','.'};
// Create an instance of StringWriter
// and attach it to the StringBuilder.
StringWriter sw = new StringWriter(sb);
// Write three characters from the array into the StringBuilder.
sw.Write(b, 0, 3);
// Display the output.
Console.WriteLine(sb);
// Close the StringWriter.
sw.Close();
}
}
可靠编程
此示例演示如何使用 StringBuilder 来修改现有的字符串。请注意，这需要一个附加的 using 声明，因为 StringBuilder 类是 System.Text 命名空间的成员。另外，这是一个直接创建字符数组并对其进行初始化的示例，而不是定义字符串然后将字符串转换为字符数组。
此代码产生以下输出：
Some number of characters to