如何处理 XmlDocument [英] How to dispose XmlDocument

问题描述

我正在使用流创建 XmlDocument 并在 XmlDocument 中进行一些更改并将 XmlDocument 保存到流本身.

I am creating a XmlDocument using a stream and do some changes in the XmlDocument and save the XmlDocument to the stream itself.

XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(fileStream);

////
////

////  
xmlDocument.Save(fileStream);
//how to dispose the created XmlDocument object.

现在如何销毁 XmlDocument 对象?

now how can i destroy the XmlDocument object?

推荐答案

首先，你不应该像这样重复使用流.你真的想长期保持外部资源开放吗?你会在重新保存 xml 之前寻找流吗?如果流比以前短，你会在保存后截断它吗?

First of all, you should not re-use streams like this. Do you really want to keep an external resource open for a long time? And will you seek the stream before you re-save the xml? And will you truncate the stream after save if it is shorter than it was before?

如果出于某种正当理由，答案是正确的，请改为一次性使用您的 XML 操作符类:

If for some justifiable reason the answers are true, make your XML manipulator class disposable instead:

public class MyXmlManipulator : IDisposable
{
    private FileStream fileStream;

    // ...

    public void ManipulateXml()
    {
        // your original codes here...
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    ~MyXmlManipulator()
    {
        Dispose(false);
    }

    protected virtual Dispose(bool disposing)
    {
        fileStream.Close();
        // etc...
    }
}

但基本上我会说不要保留对文件流的长期引用并像这样重复使用它.相反，只在本地使用流并尽快处理它们.在这里，您可能只需要一个文件名.

But basically I would say not to keep a long-living reference to a file stream and re-use it like that. Instead, use streams only locally and dispose them as soon as possible. All you might need globally here is just a file name.

public class MyXmlManipulator
{
    private string fileName;

    // ...

    public void ManipulateXml()
    {
        XmlDocument xmlDocument = new XmlDocument();
        using (var fs = new FileStream(fileName, FileMode.Open)
        {
            xmlDocument.Load(fs);
        }

        // ...

        // FileMode.Create will overwrite the file. No seek and truncate is needed.
        using (var fs = new FileStream(fileName, FileMode.Create)
        {
            xmlDocument.Save(fs);
        }
    }
}

这篇关于如何处理 XmlDocument的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！