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條款我想全下拉列表,但>>>如何在聲明從entitydatasource使用在使用entitydatasource
我有一個問題
CommandText="SELECT d.[firstName] FROM DentistEntities.Doctors AS d WHERE d.[id] IN (SELECT s.[doctorID] FROM DentistEntities.DoctorsOfSections AS s WHERE s.[sectionID] = 2)"
這是我的ASP代碼
<asp:DropDownList ID="doctorlist" runat="server" Width="172px" DataSourceID="EntityDataSource2" DataTextField="firstName" DataValueField="firstName">
</asp:DropDownList>
<asp:EntityDataSource ID="EntityDataSource2" runat="server" ConnectionString="name=DentistEntities" DefaultContainerName="DentistEntities" CommandText="SELECT d.[firstName] FROM DentistEntities.Doctors AS d WHERE d.[id] IN (SELECT s.[doctorID] FROM DentistEntities.DoctorsOfSections AS s WHERE s.[sectionID] = 2)">
</asp:EntityDataSource>
但是當我編譯我有這個錯誤
元素類型'Edm.Int32'和CollectionType'Transient.collection [Transient.rowtype(doctorID,Edm.Int32(Nullable = True,DefaultValue =))]'不兼容。 IN表達式僅支持實體,標量和引用類型。不遠的地方謂語,1號線,列69
PLZ任何幫助
謝謝
列'Doctors.id'是否允許'null'並且DoctorsOfSections.doctorID列是否允許'null'?從消息看,它看起來不匹配,您可能需要在SQL語句中使用COALESCE。 –
COALESCE'無法解析爲有效的類型或函數。近簡單的標識符, –