如何在SqlDataSource中傳遞屬性值selectCommand where conditon？

Question

我的page2.aspx.cs頁面中有一個屬性

public int? Id
{
        get
        {
            if (ViewState[Page1.Id] != null)
                return Convert.ToInt32(ViewState[Page1.Id]);
            else return null;
        }
        set
        {
            ViewState[Id] = value;
        }
    }

我正在使用asp：data sourse：

<asp:SqlDataSource ID="SqlDataSourceGridView" runat="server" 
   ProviderName="System.Data.SqlClient" 
   SelectCommand="SELECT [Name],[Address] FROM [Table_Emp] where Id = need to pass property value >" 
   OnSelecting="SqlDataSourceGridView_Selecting">
</asp:SqlDataSource>

我想在我的條件下傳遞Id。 這怎么可能。

請有人幫助我。

Answer 1

在這里，看一看

 <asp:sqlDataSource ID="EmployeeDetailsSqlDataSource" 
   SelectCommand="SELECT EmployeeID, LastName, FirstName FROM Employees WHERE EmployeeID = @EmpID"

   InsertCommand="INSERT INTO Employees(LastName, FirstName) VALUES (@LastName, @FirstName); 
                  SELECT @EmpID = SCOPE_IDENTITY()"
   UpdateCommand="UPDATE Employees SET LastName=@LastName, FirstName=@FirstName 
                    WHERE EmployeeID=@EmployeeID"
   DeleteCommand="DELETE Employees WHERE EmployeeID=@EmployeeID"

   ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"
   OnInserted="EmployeeDetailsSqlDataSource_OnInserted"
   RunAt="server">

   <SelectParameters>
     <asp:Parameter Name="EmpID" Type="Int32" DefaultValue="0" />
   </SelectParameters>

   <InsertParameters>
     <asp:Parameter Name="EmpID" Direction="Output" Type="Int32" DefaultValue="0" />
   </InsertParameters>

 </asp:sqlDataSource>

Answer 2

1）在您的select-query中插入帶有參數名稱的占位符，如@Id

2）將您的Id參數的參數規范添加到SqlDataSource的<SelectParameter>部分

<asp:SqlDataSource ID="SqlDataSourceGridView" runat="server" 
     ProviderName="System.Data.SqlClient" 
     SelectCommand="SELECT [Name],[Address] FROM [Table_Emp] where Id = @Id" 
     OnSelecting="SqlDataSourceGridView_Selecting">

    <SelectParameters>
         <asp:Parameter Name="Id" Type="Int32" />
    </SelectParameters>

</asp:SqlDataSource>

3）在選擇事件方法中將參數值放入命令

protected void SqlDataSourceGridView_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
    e.Command.Parameters["@Id"].Value = (int)(Id ?? 0); // nullable ind is not applicable here
}

Answer 3

您必須在SQLDataSource下使用Node。

看看這里： MSDN參考或教程

<asp:SqlDataSource ID="SqlDataSourceGridView" runat="server" 
   ProviderName="System.Data.SqlClient" 
   SelectCommand="SELECT [Name],[Address] FROM [Table_Emp] where Id = need to pass property value >" 
   OnSelecting="SqlDataSourceGridView_Selecting">

   <SelectParameters>
     <asp:Parameter Name="ParameterName" />
   </SelectParameters>

</asp:SqlDataSource>

OT：您在屬性ID上有錯誤。 你設置ViewState [Id]，但你嘗試檢索Viewstate [Page.id]

Answer 4

您可以從后面的代碼設置它。 只需在sql數據源中定義一個select參數即可

    <asp:SqlDataSource ID="SqlDataSourceGridView" runat="server" 
   ProviderName="System.Data.SqlClient" 
   SelectCommand="SELECT [Name],[Address] FROM [Table_Emp] where Id =@id" 
   OnSelecting="SqlDataSourceGridView_Selecting">
  <SelectParameters>
        <asp:Parameter Name="@id" Type="Int32" />
    </SelectParameters>

然后在您的代碼后面，您可以手動設置參數

SqlDataSourceGridView.SelectParameters["@id"].DefaultValue = yourValue;
Gridview1.DataBind();