Filter an Entity Framework Data Source

• Feb 18, 2026

Use the EFDataSource.Filters property to access an Entity Framework data source’s filters collection. This collection contains DBSetFilter objects that provide the settings required to filter a data source table.

The following code assigns a new filter string without referring to any parameters:

C#

// ...
dataSource.Filters["Products"] = "ProductID = 1";

VB.NET

' ...
dataSource.Filters("Products") = "ProductID = 1"

The following code makes a filter string refer to a parameter:

C#

//...

DBSetFilter filter = new DBSetFilter("Products", "ProductID = ?p1");
filter.Parameters.Add(new EFParameter("p1", typeof(int), 1));
dataSource.Filters.Add(filter);

VB.NET

Dim filter As New DBSetFilter("Products", "ProductID = ?p1")
filter.Parameters.Add(New EFParameter("p1", GetType(Integer), 1))
dataSource.Filters.Add(filter)