Question

无法将类型为“System.Web.UI.LiteralControl”的对象强制转换为类型“System.Web.UI

源码： SqlConnection sqlcon = new SqlConnection(strCon);

//定义查询字符串
string name = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim();
string borntime = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim();
string money = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim();
string address = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0])).Text.ToString().Trim();
string code = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[5].Controls[0])).Text.ToString().Trim();
string check = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[6].Controls[0])).Text.ToString().Trim();

string updatestr = "update test set name='" + name + "', borntime='" + borntime + "' , money='" + money + "', address='" + address + "', code='" + code + "', check='" + check + "' where id=" + int.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString().Trim());

后来改成如下就产生：未将对象引用设置到对象的实例提示错误
改后代码：
string name = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
string borntime = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
string money = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
string address = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
string code = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
string check = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[6].Controls[0]).FindControl("TextBox1")).Text.ToString().Trim();
SqlCommand sqlcom = new SqlCommand(updatestr, sqlcon); //实例化SQL command对象
sqlcon.Open();
sqlcom.ExecuteNonQuery();
sqlcon.Close();
求高手帮忙解决一下。。。。。

Answer 1

同意楼上的说法，肯定在后台“编辑“的响应事件中，添加了类似FindControl的方法，但是在类型转换的时候，强制转换的类型和原有的类型不符！
具体的说，就是你讲System.Web.UI.LiteralControl转换成System.Web.UI.WebControls.DropDownList了！

追问

该怎么修改？？？？？？我数据库有几个字段，类型分别是：int的id；varchar的姓名；money的薪酬；varchar的地址；varchar类型的审核字段

Answer 2

你可以试着强制转换一下看看！