/// <summary>Limits the query to only results of a specific type.</summary>
/// <returns>
/// A new <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> instance that is equivalent to the original instance with OFTYPE applied.
/// </returns>
/// <typeparam name="TResultType">
/// The type of the <see cref="T:System.Data.Entity.Core.Objects.ObjectResult`1" /> returned when the query is executed with the applied filter.
/// </typeparam>
/// <exception cref="T:System.Data.Entity.Core.EntitySqlException">The type specified is not valid.</exception>
public ObjectQuery <TResultType> OfType <TResultType>()
{
if (IsLinqQuery(this))
{
return((ObjectQuery <TResultType>)Queryable.OfType <TResultType>(this));
}
// SQLPUDT 484477: Make sure TResultType is loaded.
QueryState.ObjectContext.MetadataWorkspace.ImplicitLoadAssemblyForType(typeof(TResultType), Assembly.GetCallingAssembly());
// Retrieve the O-Space type metadata for the result type specified. If no
// metadata can be found for the specified type, fail. Otherwise, if the
// type metadata found for TResultType is not either an EntityType or a
// ComplexType, fail - OfType() is not a valid operation on scalars,
// enumerations, collections, etc.
var clrOfType = typeof(TResultType);
EdmType ofType;
if (!QueryState.ObjectContext.MetadataWorkspace.GetItemCollection(DataSpace.OSpace).TryGetType(
clrOfType.Name, clrOfType.NestingNamespace() ?? string.Empty, out ofType) ||
!(Helper.IsEntityType(ofType) || Helper.IsComplexType(ofType)))
{
var message = Strings.ObjectQuery_QueryBuilder_InvalidResultType(typeof(TResultType).FullName);
throw new EntitySqlException(message);
}
return(new ObjectQuery <TResultType>(EntitySqlQueryBuilder.OfType(QueryState, ofType, clrOfType)));
}
/// <summary>Limits the query to only results of a specific type.</summary>
/// <returns>
/// A new <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> instance that is equivalent to the original instance with OFTYPE applied.
/// </returns>
/// <typeparam name="TResultType">
/// The type of the <see cref="T:System.Data.Entity.Core.Objects.ObjectResult`1" /> returned when the query is executed with the applied filter.
/// </typeparam>
/// <exception cref="T:System.Data.Entity.Core.EntitySqlException">The type specified is not valid.</exception>
public ObjectQuery <TResultType> OfType <TResultType>()
{
if (ObjectQuery <T> .IsLinqQuery((ObjectQuery)this))
{
return((ObjectQuery <TResultType>)Queryable.OfType <TResultType>(this));
}
this.QueryState.ObjectContext.MetadataWorkspace.ImplicitLoadAssemblyForType(typeof(TResultType), Assembly.GetCallingAssembly());
Type type1 = typeof(TResultType);
EdmType type2;
if (!this.QueryState.ObjectContext.MetadataWorkspace.GetItemCollection(DataSpace.OSpace).TryGetType(type1.Name, type1.NestingNamespace() ?? string.Empty, out type2) || !Helper.IsEntityType(type2) && !Helper.IsComplexType(type2))
{
throw new EntitySqlException(Strings.ObjectQuery_QueryBuilder_InvalidResultType((object)typeof(TResultType).FullName));
}
return(new ObjectQuery <TResultType>(EntitySqlQueryBuilder.OfType(this.QueryState, type2, type1)));
}
