ObjectQuery.GetResultType 方法

public:
 System::Data::Metadata::Edm::TypeUsage ^ GetResultType();

public System.Data.Metadata.Edm.TypeUsage GetResultType ();

member this.GetResultType : unit -> System.Data.Metadata.Edm.TypeUsage

Public Function GetResultType () As TypeUsage

傳回

TypeUsage

TypeUsage 值，其中包含查詢之結果型別的相關資訊。A TypeUsage value that contains information about the result type of the query.

範例

這個範例是根據 Microsoft SQL Server 產品範例： Database。This example is based on the Microsoft SQL Server Product Samples: Database. 此範例會建立型別為 ObjectQuery<T> 的 DbDataRecord 並且使用 GetResultType 來判斷傳回的型別是否代表資料列。The example creates an ObjectQuery<T> of type DbDataRecord and uses GetResultType to determine whether the type returned represents a row.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    string queryString = @"SELECT VALUE product "
    + "FROM AdventureWorksEntities.Products AS product";
    ObjectQuery<DbDataRecord> query =
        new ObjectQuery<DbDataRecord>
            (queryString, context);

    TypeUsage type = query.GetResultType();
    if (type.EdmType is RowType)
    {
        RowType row = type.EdmType as RowType;
        foreach (EdmProperty column in row.Properties)
            Console.WriteLine("{0}", column.Name);
    }
}

Using context As New AdventureWorksEntities()
    Dim queryString As String = "SELECT VALUE product " & "FROM AdventureWorksEntities.Products AS product"
    Dim query As New ObjectQuery(Of DbDataRecord)(queryString, context)

    Dim type As TypeUsage = query.GetResultType()
    If TypeOf type.EdmType Is RowType Then
        Dim row As RowType = TryCast(type.EdmType, RowType)
        For Each column As EdmProperty In row.Properties
            Console.WriteLine("{0}", column.Name)
        Next
    End If
End Using

適用於