在我们使用asp:DropDownList时会经常遇到选项选择，当选择时触发事件OnSelectedIndexChanged，在该事件中要重新绑定选择项，我们往往会遇到一个OnSelectedIndexChanged不能多次选择的错误，代码可能这样写
ListItem item = this.ddlCurrencyType.Items.FindByText(Currency);
if (item != null)
{
ddlExpCurrency.ClearSelection();
//ddlExpCurrency.SelectedValue = item.Value;
item.Selected = true;
ddlExpCurrency_OnSelectedIndexChanged(ddlExpCurrency, null);
}
要改成
ListItem item = this.ddlCurrencyType.Items.FindByText(Currency);
if (item != null)
{
//ddlExpCurrency.ClearSelection();
ddlExpCurrency.SelectedValue = item.Value;
// item.Selected = true;
ddlExpCurrency_OnSelectedIndexChanged(ddlExpCurrency, null);
}
当用ddlExpCurrency.SelectedItem.Text = item.Text;时会改变绑定的数据