我对回传/DDL 不太熟悉。是的，我使用过 autopostback = true！下面，我正在尝试更改选定的索引...以在budgetDDL1 上触发但是，无论我尝试什么都不会！我正在将数据库中的数据绑定到 ddl ...我已经尝试将 ddl 绑定/添加到 post backs 内部/外部的表并启用/禁用视图状态等。这些都不起作用.. 必须有一个简单的答案？！我需要以什么顺序为索引更改方法创建/绑定下拉列表以触发解释也很有用！ DropDownList budgetDDL1 = new DropDownList(); protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string QueryString = "SELECT [BudgetCode], [Department], CONCAT([BudgetCode],' - ', [Department]) AS 'textvalue' FROM [tblBudget]"; using (SqlConnection myConnection = new SqlConnection(ConnectionString)) { using (SqlCommand cmd = new SqlCommand(QueryString, myConnection)) { myConnection.Open(); SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); DataTable dt = new DataTable(); dt.Load(dr); budgetDDL1.SelectedIndex = 0; budgetDDL1.DataSource = dt; budgetDDL1.DataTextField = "textvalue"; budgetDDL1.DataValueField = "BudgetCode"; budgetDDL1.AutoPostBack = true; budgetDDL1.SelectedIndexChanged += budgetDDL1_SelectedIndexChanged; budgetDDL1.DataBind(); } } } table1.Controls.Add(budgetDDL1); } protected void budgetDDL1_SelectedIndexChanged(object sender, EventArgs e) { *I have a breakpoint here which doesn't fire* string msg = budgetDDL1.SelectedItem.Text; ScriptManager.RegisterClientScriptBlock(sender as System.Web.UI.Control, this.GetType(), "alert", "alert('" + msg + "')", true); }view: <body> <form runat="server"> <table> <tr> <td id="table1" runat="server"> </td> </tr> </table> </form> </body>
2 回答
慕无忌1623718
TA贡献1744条经验 获得超4个赞
将自动回发代码放在 !IsPostback
DropDownList budgetDDL1 = new DropDownList();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string QueryString = "SELECT [BudgetCode], [Department], CONCAT([BudgetCode],' - ', [Department]) AS 'textvalue' FROM [tblBudget]";
using (SqlConnection myConnection = new SqlConnection(ConnectionString))
{
using (SqlCommand cmd = new SqlCommand(QueryString, myConnection))
{
myConnection.Open();
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataTable dt = new DataTable();
dt.Load(dr);
budgetDDL1.SelectedIndex = 0;
budgetDDL1.DataSource = dt;
budgetDDL1.DataTextField = "textvalue";
budgetDDL1.DataValueField = "BudgetCode";
}
}
}
budgetDDL1.AutoPostBack = true;
budgetDDL1.SelectedIndexChanged += budgetDDL1_SelectedIndexChanged;
budgetDDL1.DataBind();
table1.Controls.Add(budgetDDL1);
}
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