在哪里使用 StreamReader.DiscardBufferedData()?

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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.

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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