Why not assignable?

[Armin Zingler]

Hi,

Dim l1 As IList(Of IList)
Dim l2 As New List(Of List(Of Integer))

l1 = l2

Why is the assignment not compilable? Every List(Of) implements IList.

 

[Tom Shelton]

Armin Zingler presented the following explanation :

Hi,

Dim l1 As IList(Of IList)
Dim l2 As New List(Of List(Of Integer))

l1 = l2

Why is the assignment not compilable? Every List(Of) implements IList.

I think you'll find the answer here:

http://msdn.microsoft.com/en-us/library/dd799517.aspx

I doubt they have updated IList to support covariance...

 

[Armin Zingler]

Am 13.07.2010 23:52, schrieb Tom Shelton:

Armin Zingler presented the following explanation :

I think you'll find the answer here:

http://msdn.microsoft.com/en-us/library/dd799517.aspx

I doubt they have updated IList to support covariance...

Thanks Tom! If I wouldn't have to register, I could start
VB 2010 Express to try it here.