Incorrect implementation of the ITypedList and IList interfaces?

[ujaeggi]

Tried to use it with DevExpress.XtraGrid (DataGrids) but when set the datasource I get an error:

InvalidCastException: Unable to cast object of type 'Equin.ApplicationFramework.ObjectView`1[WindowsFormsApplication1.Customer]' to type
'WindowsFormsApplication1.Customer'.

Because it works with MS DataGridView I asked DevExpress and they told me:

This issue is an incorrect implementation of the ITypedList and IList interfaces at the BindingListView class level. To be more precise, the (BindingListView as ITypedList).GetItemProperties method returns a collection of property descriptors that describes objects of the Person type. However, the (BindingListView as IList)[] operator returns objects of the Equin.ApplicationFramework.ObjectView type. Since these types differ, the exception occurs.

They made a video: https://www.devexpress.com/Support/Center/Attachment/GetAttachmentFile/3e04901d-76af-4378-92b3-9101e7ab410e

[christianjunk]

Interesting. I will see what I can do. I have found a similar issue (without any answers) on Stack Overflow: https://stackoverflow.com/questions/45883684/use-waynebloss-bindinglistview-with-devexpress-xtragrid

[christianjunk]

Didn't the workaround from DevExpress work?

https://www.devexpress.com/Support/Center/Question/Details/T557988/invalidcastexception-occurs-when-bindinglistview-is-assigned-to-gridcontrol-datasource

[ujaeggi]

Stack Overflow question if from me :-) I asked this 4 months ago. Had no time until today to work on this project.

The workaround works but has limitations: filter is visible to the user, if the user sets a filter my set filter is deleted, I can't hide data from the user (hed needs to change the filter, can't hide it). So many disadvantages with this workaround.

There are other solutions. At the moment I filter the underlying BindingList before setting the DataSource. But this is only a workaround with many disadvantages.

BindingListView would be perfect.

[ujaeggi]

Hi Christian

Do you think you could have a look at this issue or is this going to far? I could certainly take a look at it, but it takes a little longer until I get used to it : -)

[christianjunk]

I will take a look at it tomorrow. I have downloaded a DevExpress test version and I will see what I can do for you. Regards, Christian

[ujaeggi]

Could you find something? Should I have a look into it?

[christianjunk]

So far, this is by design and I have not found an easy fix or workaround. If you or someone else has the time I would be glad if someone else can deal with this.

[ujaeggi]

Ok. I try to have a look into it. Thank you very much for your effort!