无法对System.String和System.Int32执行'='操作？

Question

我尝试从结果SqlDataSource绑定标签。但是我得到了这个错误

  

无法对System.String和System.Int32执行'='操作

<asp:SqlDataSource ID="SqlDataSource1"  FilterExpression="DeviceID='{0}'"   
   runat="server" ConnectionString="<%$ ConnectionStrings:DBConn %>" 
   SelectCommand="SELECT devcocom_admin.SensorDataPackage.a_TankLevel1, 
    devcocom_admin.SensorDataPackage.a_TankLevel2,devcocom_admin.DeviceID bla bla 
    bla Where bla bla ">

         <FilterParameters>


       <asp:ControlParameter Name="DeviceID" ControlID="lblDeviceIDText" 
        PropertyName="Text" />
       </FilterParameters>

         </asp:SqlDataSource>


 private void GetData()
    {
        DataView dv = (DataView)SqlDataSource1.Select(DataSourceSelectArguments.Empty);
        DataRowView drv =dv[0];

        lblTank1.Text = drv["a_TankLevel1"].ToString();
        lblTank2.Text = drv["a_TankLevel2"].ToString();
    }  


    protected void Page_Load(object sender, EventArgs e)
    {

      lblDeviceIDText.Text = this.m_Dealer.DeviceID.ToString();

       // e.g lblDeviceIDText.Text=12345 can display on page 

      GetData();           
   }

我在此行收到错误

  

DataView dv =（DataView）SqlDataSource1.Select（DataSourceSelectArguments.Empty）;

     

无法对System.String和System.Int32执行'='操作

Answer 1

将DbType="Int32"添加到ControlParameter。这是property link和enum link。