Getting all types under a userdefined assembly

Question

I am trying to get all the types defined under a particular userdefined namespace

Assembly.GetEntryAssembly().GetTypes().Where(t => t.Namespace == "namespace")


    <>c__DisplayClass3_0    
    <>c__DisplayClass4_0    
    <>c__DisplayClass6_0    
    <>c__DisplayClass2_0    
    <>c__DisplayClass2_1    
    <>c__DisplayClass2_2    
    <>c__DisplayClass2_3    
    <>c__DisplayClass2_4    
    <>c__DisplayClass2_5    
    <>c__DisplayClass2_6    
    <>c__DisplayClass2_7    
    <>c__DisplayClass2_8

My question Why am i getting these extra type which are not defined under that namespace?

how do i select type that are user defined types?

some one explain me what are these and how they get defined under a userdefined namespace.

These are generated by compiler for closures. Read this question: http://stackoverflow.com/questions/32425833/why-does-c-sharp-compiler-create-private-displayclass-when-using-linq-method-any — Yeldar Kurmangaliyev, Mar 28 '17 at 11:32

Jon Skeet · Accepted Answer · 2017-03-28T11:30:13.020

8

Those are all types generated by the compiler. The C# compiler generates types to implement things like:

Lambda expressions and anonymous methods
Iterator blocks
Async methods
Anonymous types

All of them should have the CompilerGeneratedAttribute applied to them, so you can filter them out that way if you want:

var types = Assembly.GetEntryAssembly()
    .GetTypes()
    .Where(t => t.Namespace == "namespace")
    .Where(t => !t.GetTypeInfo().IsDefined(typeof(CompilerGeneratedAttribute), true));

edited Mar 28 '17 at 11:30

answered Mar 28 '17 at 11:23

Jon Skeet

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how do i filter only user defined type from this ? – Sriram Mar 28 '17 at 11:25
@sriram: As I say, filter out ones that have `CompilerGeneratedAttribute` applied. I'm writing up an example. – Jon Skeet Mar 28 '17 at 11:25
thanks a lot, but the type.isDefined is not there in .net core. – Sriram Mar 28 '17 at 11:29
@sriram: You need to use `GetTypeInfo()` in .NET Core to get the associated `TypeInfo`. I'll update my answer. – Jon Skeet Mar 28 '17 at 11:34
thanks a lot man. it's an honor to get an answer from the great JonSkeet :) – Sriram Mar 28 '17 at 11:35

score 4 · Answer 2 · edited May 23 '17 at 12:25

These are generated by compiler for closures.

This question explains why they are created: Why does C# compiler create private DisplayClass when using LINQ method Any() and how can I avoid it?

You can check for CompilerGeneratedAttribute to know which classes are compiler-generated and remove them from your collection:

Assembly.GetEntryAssembly().GetTypes()
   .Where(t => t.Namespace == "namespace")
   .Where(x => !x.GetTypeInfo().GetCustomAttributes<CompilerGeneratedAttribute>().Any());

Getting all types under a userdefined assembly

2 Answers2

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