Question

我有一个下拉列表我试图在后面的代码中使用sql中的id但我得到错误...

未声明。由于其保护级别，它可能无法访问。

  <asp:DropDownList  
  selectedvalue='<%#Container.DataItem("manufidcurrent")%>' 
  ID="selCurrentManuf" 
  Runat="Server" 
  DataTextField="Desc" 
  DataValueField="manufid"
  DataSource="<%# GetCurrentManuf() %>" 
  autopostback="true" 
  OnSelectedIndexChanged="selCurrentManuf_SelectedIndexChanged"  ></asp:DropDownList>

在后面的代码中我有一个试图使用所选选项的函数......

Function GetCurrentModel() As DataSet
Dim mySession = System.Web.HttpContext.Current.Session
Dim myQuery As String = "SELECT * FROM model where id = " + selCurrentManuf.SelectedItem.Value
Dim myConnection As New MySqlConnection(mySession("localConn"))
myConnection.Open()
Dim myCommand As New MySqlCommand(myQuery, myConnection)
Dim myDataAdapter = New MySqlDataAdapter(myCommand)
Dim myDataset As New DataSet
myDataAdapter.Fill(myDataset, "model")
Dim dr As DataRow = myDataset.Tables(0).NewRow       
myDataset.Tables(0).Rows.Add(dr)      
GetCurrentModel =  myDataset             
End Function

Answer 1

有时designer.cs文件被搞砸了。您可以手动将DropDown添加到designer.cs文件，或者再次将下拉列表粘贴到标记中可以解决问题。

在designer.cs文件中手动声明DropDown：

/// <summary>
/// selCurrentManuf control.
/// </summary>
/// <remarks>
/// Auto-generated field.
/// To modify move field declaration from designer file to code-behind file.
/// </remarks>
protected global::System.Web.UI.WebControls.DropDownList selCurrentManuf;

'selCurrentManuf'未声明。由于其保护级别，它可能无法访问

1 个答案: