CODEWITHSUNDEEP
c#generics
Sebi
Sebi

Reputation: 3979

Determine if List<Type> contains ICollection<dynamic>

I need to determine if a List contains ICollection where T is dynamic and not known at compiletime. Heres my code to better understand what I mean:

private void RefreshDataSource<T>(ICollection<T> dataSource) where T : IEquatable<T>
{
   dynamic row = view.GetFocusedRow(); 
   //Get's the focused row from a DevExpress-Grid
   //I don't know the type because it's MasterDetail and the view can be a DetailView. In this case type T isn't the underlying type.

   //Getting all Properties
   var dummy = dataSource.FirstOrDefault();
   var props = dummy.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public).ToList();

   //Now comes the real problem, I need to determine the Detail Datasource
   //and to do this I want to check if there is a Property from ICollection<typeof(row)>

   //How can I check on ICollection<typeof(row)> instead of row
   //IsAssignableFrom would better fit my needs but I don't get how to solve my problem with it.
   var detailSource = props.FirstOrDefault(p => p.PropertyType.IsInstanceOfType(row));
}

The code is broken to the important points, so don't wonder if sth. doesn't makes sense in your eyes ;-). Is there any way to check on ICollection<T> where T is a dynamic type and just know at runtime?

Notice that the given T on top of the method isn't the type of row, because of MasterDetail relationship!!!

UDPATE

I think I need to clarify what I need. Think of me as a Grid. I'm getting a DataSource which is a ICollection<T> and every row is represented by an object of T. Now I'm using MasterDetail relationships so that T just represents one MasterRow in the Grid. The Rows of a DetailView are represented by any ICollection<AnyClass> which is defined as a Property on T.

Now I need to determine this ICollection<AnyClass> Property from T without knowing what AnyClass is at compile time. Because I know the DetailView I can do this:

dynamic row = view.GetFocusedRow();

So row is of type AnyClass and known at Runtime. But how can I find this ICollection<AnyClass> Property in the PropertyCollection of T? This is my problem.

Upvotes: 1

Views: 133

Answers (1)

CSharpie
CSharpie

Reputation: 9477

In general, this should do

.GetType().GetInterfaces().Any(intf => intf == typeof(ICollection<dynamic>));

in case you meant Tand not dynamic, simple replace them.

 .GetType().GetInterfaces().Any(intf => intf == typeof(ICollection<T>));

If you want T and subtypes of it, it gets more complicated

.GetType().GetInterfaces().Any(intf => intf.IsGenericType && 
                                        intf.GetGenericTypeDefinition() == typeof(ICollection<>) && 
                                        intf.GetGenericArguments()[0].IsAssigneableFrom(typeof(T)));

EDIT Since you calrified what you actually need:

.GetType().GetInterfaces().Any(intf => intf.IsGenericType && 
                                       intf.GetGenericTypeDefinition() == typeof(ICollection<>));

It could be much simpler, but ICollection<T> does not implement ICollection.

Upvotes: 1

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