SortedBindingLists with Interfaces

Wbmstrmjb posted on Monday, November 02, 2009

Running into an issue with SBLs and Interfaces. I have an Interface for an Editable Collection that has a SortedBindingList as a property:

(I replaced lessthan/greaterthan with ^ because forum doesn't like carrots)

interface IClassA {
SortedBindingList^IClassAChild^ Sorted {get;}
}

interface IClassAChild {
// blah
}

In the implementation, the SortedBindingList won't take the implementing object's type without blowing up:

SortedBindingList^IClassAChild^ sorted = new SortedBindingList^IClassAChild ^((System.Collections.Generic.IList^ IClassAChild^)this); // COMPILES BUT BLOWS UP AT RUNTIME

How else can I implement an SBL (or any sort for that matter) on my object which returns either itself sorted, or a List of IClassAChild?

RockfordLhotka replied on Monday, November 02, 2009

Can you provide the exception detail?

Wbmstrmjb replied on Monday, November 02, 2009

System.InvalidCastException : Unable to cast object of type 'Cap.BusinessObjects.FacilityMaint.DismantlerContractAmendmentList' to type 'System.Collections.Generic.IList`1[Cap.BusinessObjects.FacilityMaint.IContractAmendment]'.

In this case, IContractAmendment would be IClassAChild in my example and DismantlerContractAmendmentList iimplements IClassA.

Happens on the instantiation of the SortedBindingList.