Question

GridView中怎样得到DropDownList 选择中的值

前台代码： 后台获取选中值的代码：string txt = ((DropDownList)GridView1.Rows[i].FindControl("DropDownList1")).SelectedItem.Text.ToString();//这里错误，提示：System.NullReferenceException: 未将对象引用设置到对象的实例。 string txt = ((DropDownList)GridView1.Rows[i].FindControl("DropDownList1")).SelectedItem.Value; //同样错误。((DropDownList)GridView1.Rows[i].FindControl("DropDownList1")).SelectedValue.ToString(); //返回空值

Answer 1

你写错了string txt = ((DropDownList)GridView1.Rows[i].FindControl("DropDownList1")).SelectedItem.Value;应该是DropDownList ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");string txt = ddl.SelectedValue;你怎么能把控件类型直接复制给string呢？

Answer 2

楼时间啊的，一样的。同样的错误，试过N次了。