ASP.Net：下拉列表和动态创建的数据源

Question

我有大约10个下拉列表控件被填充。而不是复制/粘贴和修改每个领域的几个领域，我想以编程方式创建它们。这可以做到吗？

以下是其中之一的样子。我想以编程方式添加10个dropdownlist控件和它们各自的SqlDataSource控件。

<asp:SqlDataSource ID = "ddlDAGender" runat=server 
    ConnectionString="<%$ ConnectionStrings:test1ConnectionString %>" 
    SelectCommand = "select GenderID,Gender from mylookupGender" 
    > 
    </asp:SqlDataSource> 


<asp:Label ID="Label3" runat="server" Text="Gender"></asp:Label> 

     <asp:DropDownList ID="ddlGender" runat="server" 
       DataSourceid="ddlDAGender" 
       DataTextField="Gender" DataValueField="GenderID" 

    > 

</asp:DropDownList> 

Answer 1

您可以随时动态创建控件。但在这种情况下，如果所有的下拉列表都不相同，我不确定它是否可以节省任何东西，因为您仍然必须为它们分配单独的ID和数据源。

下面的代码可能看起来像：

protected void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
     BindDropDownLists(); 
    } 
} 

protected void Page_Init(object sender, EventArgs e) 
{ 

     SqlDataSource sqlDS = new SqlDataSource(); 
     sqlDS.ConnectionString = ConfigurationManager.ConnectionStrings[0].ToString(); 
     sqlDS.SelectCommand = "select GenderID,Gender from mylookupGender"; 
     form1.Controls.Add(sqlDS); 

     DropDownList ddl = new DropDownList(); 
     ddl.ID = "dddlGender"; 
     ddl.DataSource = sqlDS; 
     ddl.DataTextField = "Gender"; 
     ddl.DataValueField = "GenderID"; 
     form1.Controls.Add(ddl); 

     // ... Repeat above code 9 times or put in a for loop if they're all the same... 
} 

private void BindDropDownLists() 
{ 
    foreach (Control ctl in form1.Controls) 
    { 
     if (ctl is DropDownList) 
     { 
      (ctl as DropDownList).DataBind(); 
     } 
    } 
}