在使用XDocument.Load()加载文件之前，如何测试文件以查看它是否为有效的XML文件? [英] How does one test a file to see if it's a valid XML file before loading it with XDocument.Load()?

问题描述

我正在使用以下内容在C#应用程序中加载XML文档:

I'm loading an XML document in my C# application with the following:

XDocument xd1 = new XDocument();
xd1 = XDocument.Load(myfile);

但是在此之前，我会进行测试以确保文件存在:

but before that, I do test to make sure the file exists with:

File.Exists(myfile);

但是...是否有一种(简便)方法可以在XDocument.Load()之前测试文件，以确保它是有效的XML文件?换句话说，我的用户可能不小心在文件浏览器中单击了另一个文件，然后尝试加载，例如.php文件导致了异常.

But... is there an (easy) way to test the file before the XDocument.Load() to make sure it's a valid XML file? In other words, my user can accidentally click on a different file in the file browser and trying to load, say, a .php file causes an exception.

我唯一想到的方法是将其加载到StreamWriter中，并简单地对前几个字符进行文本搜索，以确保它们说出

谢谢！

The only way I can think of is to load it into a StreamWriter and simple do a text search on the first few characters to make sure they say "

Thanks!

-阿德娜(Adeena)

-Adeena

推荐答案

如果要向用户显示消息，可能值得捕获特定的异常:

It's probably just worth catching the specific exception if you want to show a message to the user:

 try
 {
   XDocument xd1 = new XDocument();
   xd1 = XDocument.Load(myfile);
 }
 catch (XmlException exception)
 {
     ShowMessage("Your XML was probably bad...");
 }

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