HOW TO：從字串中讀取字元
更新：2007 年 11 月
下列程式碼範例允許您自現有字串中的指定位置開始，從字串讀取一定數目的字元。請使用 StringReader，如下所示。
這個程式碼定義字串並將字串轉換成字元陣列，接著可使用適當的 StringReader.Read 方法讀取陣列。
這個範例只從字串中讀取指定的字元數，如下所示。
Some number o
範例
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Public Class CharsFromStr
Public Shared Sub Main()
' Create a string to read characters from.
Dim str As [String] = "Some number of characters"
' Size the array to hold all the characters of the string
' so that they are all accessible.
Dim b(24) As Char
' Create an instance of StringReader and attach it to the string.
Dim sr As New StringReader(str)
' Read 13 characters from the array that holds the string, starting
' from the first array member.
sr.Read(b, 0, 13)
' Display the output.
Console.WriteLine(b)
' Close the StringReader.
sr.Close()
End Sub
End Class
using System;
using System.IO;
public class CharsFromStr
{
public static void Main(String[] args)
{
// Create a string to read characters from.
String str = "Some number of characters";
// Size the array to hold all the characters of the string
// so that they are all accessible.
char[] b = new char[24];
// Create an instance of StringReader and attach it to the string.
StringReader sr = new StringReader(str);
// Read 13 characters from the array that holds the string, starting
// from the first array member.
sr.Read(b, 0, 13);
// Display the output.
Console.WriteLine(b);
// Close the StringReader.
sr.Close();
}
}