你能阻止 StreamReader 处理底层流吗? [英] Can you keep a StreamReader from disposing the underlying stream?

问题描述

有没有办法做到这一点:

Is there a way to do this:

this.logFile = File.Open("what_r_u_doing.log", FileMode.OpenOrCreate, FileAccess.ReadWrite);

using(var sr = new StreamReader(this.logFile))
{
    // Read the data in
}

// ... later on in the class ...

this.logFile = File.Open("what_r_u_doing.log", FileMode.OpenOrCreate, FileAccess.ReadWrite);

using(var sw = new StreamWriter(this.logFile))
{
    // Write additional data out...
}

无需打开文件两次?

我似乎无法让 StreamReader 不处理我的流.我也不想让它超出范围.然后垃圾收集器最终会调用Dispose，杀死流.

I can't seem to make the StreamReader not-dispose my stream. I don't want to just let it go out of scope, either. Then the garbage collector will eventually call the Dispose, killing the stream.

推荐答案

我也不想让它超出范围.然后垃圾收集器最终会调用Dispose，杀死流.

I don't want to just let it go out of scope, either. Then the garbage collector will eventually call the Dispose, killing the stream.

垃圾收集器将调用 Finalize 方法(析构函数)，而不是 Dispose 方法.终结器将调用 Dispose(false)，后者将不处置底层流.如果您需要直接使用底层流，您应该可以让 StreamReader 超出范围.只要确保在适当的时候手动处理底层流即可.

Garbage collector will call the Finalize method (destructor), not the Dispose method. The finalizer will call Dispose(false) which will not dispose the underlying stream. You should be OK by leaving the StreamReader go out of scope if you need to use the underlying stream directly. Just make sure you dispose the underlying stream manually when it's appropriate.

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