C#CA2000 :Dispose objects before losing scope using FileStream/XmlTextReader

Question

我有很多这样的代码:

FileStream fs = File.Open(@"C:\Temp\SNB-RSS.xml", FileMode.Open); 
using (XmlTextReader reader = new XmlTextReader(fs)) 
{ 
   /* Some other code */
}

这给了我以下代码分析警告:

CA2000 : Microsoft.Reliability : In method 'SF_Tester.Run()', object 'fs' is not disposed along all exception paths. Call System.IDisposable.Dispose on object 'fs' before all references to it are out of scope.

如果我按照建议将 File.Open 放在 using 语句中，我会得到:

CA2202 : Microsoft.Usage : Object 'fs' can be disposed more than once in method 'SF_Tester.Run()'. To avoid generating a System.ObjectDisposedException you should not call Dispose more than one time on an object.: Lines: 39

我正在使用 VS2010，我忍不住认为我做错了什么，但我没有看到它。我做错了什么？

Answer 1

唉，累不累啊。使用推荐的 Create() 方法可以避免这一切:

 using (var reader = XmlReader.Create(@"C:\Temp\SNB-RSS.xml")) {
     //...
 }