ObjectQuery<T>.GroupBy Method (String, String, ObjectParameter[])
Groups the query results by the specified criteria.
Assembly: EntityFramework (in EntityFramework.dll)
public ObjectQuery<DbDataRecord> GroupBy( string keys, string projection, params ObjectParameter[] parameters )
Parameters
- keys
-
Type:
System.String
The key columns by which to group the results.
- projection
-
Type:
System.String
The list of selected properties that defines the projection.
- parameters
-
Type:
System.Data.Entity.Core.Objects.ObjectParameter[]
Zero or more parameters that are used in this method.
Return Value
Type: System.Data.Entity.Core.Objects.ObjectQuery<DbDataRecord>A new ObjectQuery<T> instance of type DbDataRecord that is equivalent to the original instance with GROUP BY applied.
Exception | Condition |
---|---|
ArgumentNullException | The query parameter is null or an empty string or the projection parameter is null or an empty string. |