在范型中接口和实例间转换的问题Why No? .net 2.0 Generic cast Type From Instance to Interface...

Since OO age,we were used to cast a interface from Instance class, like this:

Iuser iu=new User();

that's natural and easy , i like it;

however in .NET2.0 , have a new&hot feature call "generic" ,can write code less than beforetime,

but,when i try towrite some codemixing interface/instance & generic, i got a big problem

this :

List<Iuser > ius = new List<User>();

or this:

List<user> us = new List<Iuser >();

anyway impossible!

anyone would like to give me some suggestions?