为什么FileStream没有被XmlReader关闭 [英] Why is FileStream not closed by XmlReader

问题描述

所以我正在 XmlReader

using (XmlReader reader = XmlReader.Create(new FileStream(archivePath, FileMode.Open), readerSettings))
{
    reader.close()
}

但是，在 using 作用域之后，送入 XmlReader 的文件仍然处于锁定状态，很奇怪，我认为 XmlReader 是会为我关闭 FileStream ，不是吗?

However, the file feed into the XmlReader is still in the lock state after the using scope, weird, I thought the XmlReader is going to close the FileStream for me, is it not?

感谢您的帮助.

推荐答案

您尝试过吗?

using(var stream = new FileStream(archivePath, FileMode.Open))
using(var reader = XmlReader.Create(stream, readerSettings))
{

}

我在文档中找不到任何明确声明 XmlReader 将在基础流被处置时调用dispose的内容.另外，我总是按上面所示的方式使用它，而且从未遇到过问题.

I couldn't find anything in the documentation that explicitly stated that the XmlReader would call dispose on the underlying stream when it was disposed. Also, I always use it as shown above and I have never encountered a problem.

浏览反射器时，我也没有发现在创建 XmlTextReaderImpl 时在流上调用 Dispose()的任何实例. XmlTextReaderImpl 未实现 Dispose()，其 Close()方法如下所示:

Browsing through reflector I also find no instances where it calls Dispose() on the stream when creating a XmlTextReaderImpl. The XmlTextReaderImpl does not implement Dispose() and its Close() method looks like this:

internal void Close(bool closeInput)
{
    if (this.parsingFunction != ParsingFunction.ReaderClosed)
    {
        while (this.InEntity)
        {
            this.PopParsingState();
        }
        this.ps.Close(closeInput);
        this.curNode = NodeData.None;
        this.parsingFunction = ParsingFunction.ReaderClosed;
        this.reportedEncoding = null;
        this.reportedBaseUri = string.Empty;
        this.readState = ReadState.Closed;
        this.fullAttrCleanup = false;
        this.ResetAttributes();
    }
}

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