Question

In certain cases I need to determine a type and I just don’t know what the type is. For example, DevExpress plugins request a type when getting data.

e.Data.GetDataPresent(typeof(DataRow))

I set the data source as a DataTable. I don’t know if the data present is actually a String, DataRow, DataColumn or other.

Is there any way to determine this type without having to hack at all the possibilties one by one in the debugger/Immediate window?

UPDATE
In this case it’s a winform app event

private void grid_VDragOver(object sender, System.Windows.Forms.DragEventArgs e)
        {
            if (e.Data.GetDataPresent(typeof(DataColumn)))//DataColumn is just a guess..no idea
                e.Effect = DragDropEffects.Move;
            else
                e.Effect = DragDropEffects.None;
        }

Answer 1

You can use object.GetType() – all objects implement it, so you can simply use that:

e.Data.GetDataPresent(variable.GetType())

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Update:

With the revision (drag drop data accessible only through IDataObject and no variable), this answer is of limited use to the OP. I will keep it here for those whom it might help that do not have these exact constraints.