C#认识/理解/运用 StreamReader,StreamWriter,StringReader,StreamWriter

题记

StreamReader,StreamWriter,StringReader,StreamWriter 每次看到这几个词的时候,就会混淆(理解不够深刻),在使用过程中也经常犯浑,为了能更好的理解,写下此文章。

正文

概念

首先,从字面可以看出,StreamReader,StringReader是用来读操作,StreamWriter,StreamWriter是用来写操作。

接下来看这几个类在类库中的层次

C#认识/理解/运用 StreamReader,StreamWriter,StringReader,StreamWriter

上图中,StreamReader,StringReader都派生自TextReader类(TextReader:表示可读取连续字符序列的读取器。抽象基类)

StreamReader从流中读取字符

StringReader从字符串读取字符

C#认识/理解/运用 StreamReader,StreamWriter,StringReader,StreamWriter

上图中,StreamWriter,StreamWriter派生自TextWriter类(TextWriter:表示可以编写一个有序字符序列的编写器。该类为抽象类。)

StreamWriter将字符写入流

StreamWriter将字符写入字符串

代码

reader操作

private static void StringRead()
{
string in_str ="流操作,字符操作,io操作";
string read_str, aParagraph = null;
StringReader sr = new StringReader(in_str);
while (true)
{
read_str = sr.ReadLine();
if (read_str != null)
{
aParagraph = aParagraph + in_str + " ";
}
else
{
aParagraph = aParagraph + "\n";
break;
}
}
}

private static void StreamRead()
{
Stream rStream = new FileStream(@"E:/20120214.txt", FileMode.Open);
StreamReader sr = new StreamReader(rStream, Encoding.UTF8);
//从流中读取字符
string result = sr.ReadToEnd();
//释放资源
sr.Close();
rStream.Close();
}

writer操作

private static void StreamWriter()
{
string in_str = DateTime.Now.ToString("MM-dd HH:mm:ss:fff");
//第二个参数 是否追加
StreamWriter sw = new StreamWriter(@"E:/20120214.txt",true,Encoding.Default);
sw.Write(in_str);
sw.Flush();
sw.Close();
}

private static void StringWriter()
{
StringWriter sw = new StringWriter();
sw.Write("文字,学习,文字,c#");
sw.Close();
}

来自:http://www.cnblogs.com/zhxhdean/archive/2012/02/20/2359605.html

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