/// <summary>Limits the query results to only the property specified in the projection.</summary>
/// <returns>
/// A new <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> instance of a type compatible with the specific projection. The returned
/// <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" />
/// is equivalent to the original instance with SELECT VALUE applied.
/// </returns>
/// <param name="projection">The projection list.</param>
/// <param name="parameters">An optional set of query parameters that should be in scope when parsing.</param>
/// <typeparam name="TResultType">
/// The type of the <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> returned by the
/// <see cref="M:System.Data.Entity.Core.Objects.ObjectQuery`1.SelectValue``1(System.String,System.Data.Entity.Core.Objects.ObjectParameter[])" />
/// method.
/// </typeparam>
/// <exception cref="T:System.ArgumentNullException"> projection is null or parameters is null.</exception>
/// <exception cref="T:System.ArgumentException">The projection is an empty string.</exception>
public ObjectQuery <TResultType> SelectValue <TResultType>(
string projection,
params ObjectParameter[] parameters)
{
Check.NotEmpty(projection, nameof(projection));
Check.NotNull <ObjectParameter[]>(parameters, nameof(parameters));
this.QueryState.ObjectContext.MetadataWorkspace.ImplicitLoadAssemblyForType(typeof(TResultType), Assembly.GetCallingAssembly());
return(new ObjectQuery <TResultType>(EntitySqlQueryBuilder.SelectValue(this.QueryState, this.Name, projection, parameters, typeof(TResultType))));
}
/// <summary>Limits the query results to only the property specified in the projection.</summary>
/// <returns>
/// A new <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> instance of a type compatible with the specific projection. The returned
/// <see
/// cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" />
/// is equivalent to the original instance with SELECT VALUE applied.
/// </returns>
/// <param name="projection">The projection list.</param>
/// <param name="parameters">An optional set of query parameters that should be in scope when parsing.</param>
/// <typeparam name="TResultType">
/// The type of the <see cref="T:System.Data.Entity.Core.Objects.ObjectQuery`1" /> returned by the
/// <see
/// cref="M:System.Data.Entity.Core.Objects.ObjectQuery`1.SelectValue``1(System.String,System.Data.Entity.Core.Objects.ObjectParameter[])" />
/// method.
/// </typeparam>
/// <exception cref="T:System.ArgumentNullException"> projection is null or parameters is null.</exception>
/// <exception cref="T:System.ArgumentException">The projection is an empty string.</exception>
public ObjectQuery <TResultType> SelectValue <TResultType>(string projection, params ObjectParameter[] parameters)
{
Check.NotEmpty(projection, "projection");
Check.NotNull(parameters, "parameters");
// SQLPUDT 484974: Make sure TResultType is loaded.
QueryState.ObjectContext.MetadataWorkspace.ImplicitLoadAssemblyForType(typeof(TResultType), Assembly.GetCallingAssembly());
return
(new ObjectQuery <TResultType>(
EntitySqlQueryBuilder.SelectValue(QueryState, Name, projection, parameters, typeof(TResultType))));
}
/// <summary>
/// This query-builder method creates a new query whose results are a sequence
/// of values projected from the results of this query.
/// </summary>
/// <param name="projection">
/// The projection list.
/// </param>
/// <param name="parameters">
/// An optional set of query parameters that should be in scope when parsing.
/// </param>
/// <returns>
/// a new ObjectQuery instance.
/// </returns>
/// <exception cref="ArgumentNullException">
/// If either argument is null.
/// </exception>
/// <exception cref="ArgumentException">
/// If the projection list command text is empty.
/// </exception>
public ObjectQuery <TResultType> SelectValue <TResultType> (string projection, params ObjectParameter[] parameters)
{
EntityUtil.CheckArgumentNull(projection, "projection");
EntityUtil.CheckArgumentNull(parameters, "parameters");
if (StringUtil.IsNullOrEmptyOrWhiteSpace(projection))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.ObjectQuery_QueryBuilder_InvalidProjectionList, "projection");
}
// SQLPUDT 484974: Make sure TResultType is loaded.
this.QueryState.ObjectContext.MetadataWorkspace.ImplicitLoadAssemblyForType(typeof(TResultType), System.Reflection.Assembly.GetCallingAssembly());
return(new ObjectQuery <TResultType>(EntitySqlQueryBuilder.SelectValue(this.QueryState, this.Name, projection, parameters, typeof(TResultType))));
}
