与 C# 中的 Assembly.GetExecutingAssembly().GetTypes() 相关的问题

Question

On my website. I have added a class file in App_Code containing 5 public classes into one NameSpace.

I want to get all class names containing in a particular namespace.

In default.aspx.cs file i have added.

var q = from t in Assembly.GetExecutingAssembly().GetTypes()
                            where t.IsClass && t.Namespace == "Sample"
q.ToList().ForEach(t => Console.WriteLine(t.Name));

But I didn't find Sample namespace in Assembly.GetExecutingAssembly().GetTypes() how do I access the 'Sample' namespce in above code?

Thanks

Answer 1

In default.aspx.cs file i have added

That's the problem. When you have a website (in contrast to a web application), all code that you put inside App_Code is compiled dynamically at runtime in a separate assembly. So when you write Assembly.GetExecutingAssembly() you are basically getting the assembly that was generated for your default.aspx WebForm which is different than the assembly containing the code in App_Code . You could loop through all referenced assemblies in the project to look for types.

To get this list of assemblies you could use the GetAssemblies method on the current application domain.

Another possibility is to use some known type that you know was contained in the App_Code folder in order to get its assembly:

var assembly = typeof(Some_Type_That_Is_Declared_In_App_Code).Assembly;
var q = 
    from t in assembly.GetTypes()
    where t.IsClass && t.Namespace == "Sample"
    select t;

Answer 2

I think the problem here might be due to the fact that this code is being executed in a temporary assembly created from your codebehind files.

To check this:

• Try just dumping out what Namespaces and classes are available in your assembly - eg

var q = from t in Assembly.GetExecutingAssembly().GetTypes() where t.IsClass select t; q.ToList().ForEach(t => Console.WriteLine(t.Namespace));

• Try using a known assembly instead of the executing assembly - eg typeof(Sample.Class1).Assembly

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or... just read @Darin's answer... I must learn to type faster!