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我有datalist，我有ddl，用户可以从ddl中选择值来绑定datalist。当我尝试在datalist中找到ddl当用户选择值时，此错误对应从DDL中选择的值时出错
索引超出范围。必须为 非负值且小于 的大小。参数名：索引
这里
DDLProduct2 = (DropDownList)DLProduct.Items[DLProduct.EditItemIndex].FindControl("DDlProduct");
所以请任何一个帮助我。
private DropDownList DDLProduct2;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ProductByProductID();
CategoryParentZero();
}
}
protected void DDlProduct_SelectedIndexChanged(object sender, EventArgs e)
{
DDLProduct2 = (DropDownList)DLProduct.Items[DLProduct.EditItemIndex].FindControl("DDlProduct");
if (DDLProduct2 != null)
{
if (DDLProduct2.SelectedIndex > 0)
{
using
(SqlConnection conn = Connection.GetConnection())
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "SP_GetProductsByProductID";
SqlParameter ParentID_Param = cmd.Parameters.Add("@ProductID", SqlDbType.Int);
ParentID_Param.Value = DDLProduct2.SelectedValue;
;
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
da.Fill(dt);
DLProduct.DataSource = dt;
DLProduct.DataBind();
}
}
}
}