I have a generic Repository<T> class I want to use with an ObjectDataSource. Repository<T> lives in a separate project called DataAccess. According to this post from the MS newsgroups (relevant part copied below):
Internally, the ObjectDataSource is calling Type.GetType(string) to get the type, so we need to follow the guideline documented in Type.GetType on how to get type using generics. You can refer to MSDN Library on Type.GetType:
http://msdn2.microsoft.com/en-us/library/w3f99sx1.aspx
From the document, you will learn that you need to use backtick (`) to denotes the type name which is using generics.
Also, here we must specify the assembly name in the type name string.
So, for your question, the answer is to use type name like follows:
TypeName=’TestObjectDataSourceAssembly.MyDataHandler`1[System.String],TestObjectDataSourceAssembly’
Okay, makes sense. When I try it, however, the page throws an exception:
<asp:ObjectDataSource ID='MyDataSource' TypeName='MyProject.Repository`1[MyProject.MessageCategory],DataAccess' /> [InvalidOperationException: The type specified in the TypeName property of ObjectDataSource ‘MyDataSource’ could not be found.]
The curious thing is that this only happens when I’m viewing the page. When I open the ‘Configure Data Source’ dialog from the VS2008 designer, it properly shows me the methods on my generic Repository class. Passing the TypeName string to Type.GetType() while debugging also returns a valid type. So what gives?
Do something like this.
get the value of assemblyQualifiedName and paste it into the TypeName field. Note that Type.GetType(string), the value passed in must be
So, it may work by passing in that string in your code, because that class is in the currently executing assembly (where you are calling it), where as the ObjectDataSource is not.
Most likely the type you are looking for is