Question

I need to write a wrapper that would allow me to sort and filter a QueryObject without loosing the sync capabilities of the object (it’s for DataGridView data binding).

This seems like what I need, but it’s in the upcomming (beta I think?) EF 5, while I’m still only on EF 3.5. I need to mimic that feature in a older version.

I found a wrapper that enabled me to sort, but not filter and I fail to figure out which path to take to add Filter support in this wrapper. This wrapper also looses the sync with the QueryObject, but I don’t think that would be hard to fix.

Answer 1

You can extend BindingSource to create a seperation from the displayed data and the actual data. After that, using Dynamic LINQ, it is possible to write filter methods that will work with any type of data.

if (f.Value.type == AdvFilterTypes.Contains)
    tmpList = tmpList.AsQueryable().Where(f.Value.property + ".Contains(\"" + f.Value.condition.Replace(@"\", @"\\").Replace("\"", "\\\"") + "\")");
else
    tmpList = tmpList.AsQueryable().Where(f.Value.property + " " + f.Value.typeSymbole + " " + f.Value.condition);