在哪里使用 StreamReader.DiscardBufferedData()? [英] Where to use StreamReader.DiscardBufferedData()?

问题描述

我有以下代码:

StreamReader StreamReader = new StreamReader("File.txt");
string Line = "";

while((Line = StreamReader.ReadLine()) != null)
{
    string Value = Line.Trim();
    string Value2 = StreamReader.ReadLine();
    int CursorValue = StreamReader.BaseStream.Position;

    if(Condition)
    {
        StreamReader.BaseStream.Position = SOMETHING_ELSE;
        Console.WriteLine(StreamReader.ReadLine());
    }

    StreamReader.BaseStream.Position = CursorValue;
}

有人能告诉我应该在哪里使用 StreamReader.DiscardBufferedData() 吗?

Can anybody tell me where I am supposed to use StreamReader.DiscardBufferedData() here?

推荐答案

来自 MSDN:

使用 DiscardBufferedData 方法重置 StreamReader 对象的内部缓冲区.只有在内部缓冲区和BaseStream的位置不匹配时才需要调用该方法.

Use the DiscardBufferedData method to reset the internal buffer for the StreamReader object. You need to call this method only when the position of the internal buffer and the BaseStream do not match.

举个例子:

Stream s = new MemoryStream();
StreamReader sr = new StreamReader(s);
// Read things here.
s.Position = 10;
sr.DiscardBufferedData();        // reader now reading from position 0
sr.BaseStream.Seek(10, SeekOrigin.Begin); // Reader now reading from location 10.

就你而言:

StreamReader.BaseStream.Position = SOMETHING_ELSE;
sr.DiscardBufferedData();
StreamReader.BaseStream.Seek(SOMETHING_ELSE, SeekOrigin.Begin);
Console.WriteLine(StreamReader.ReadLine());

不要忘记再次回到:

StreamReader.BaseStream.Position = CursorValue;
sr.DiscardBufferedData();
StreamReader.BaseStream.Seek(CursorValue, SeekOrigin.Begin);

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