无法将类型“int”隐式转换为“System.Data.SqlClient.SqlDataReader

[大_健]

protected void Page_Load(object sender, EventArgs e)
{
if ((string)Session["userRole"] != "0")
Response.Redirect("Login.aspx");
string tn = (string)Session["userName"];
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString1"].ConnectionString);
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "select * from 课程 where 教师号='" + tn + "'";
conn.Open();
SqlDataReader dr = cmd.ExecuteNonQuery();//问题所在处1
GridView1.DataSource = dr;
GridView1.DataBind();
dr.Close();
SqlCommand cmd1 = conn.CreateCommand();
cmd1.CommandText = "select 姓名 from 教师 where 教师号='" + tn + "'";
SqlDataReader dr1 = cmd1.ExecuteNonQuery();//问题所在处2
dr1.Read();
LabMes.Text = (string)dr1[0] + "老师的任课情况：";
Session["teacher"] = (string)dr1[0];
conn.Close();
}

[骑着蜗牛去爬山]

SqlDataReader dr = cmd.ExecuteNonQuery(); => SqlDataReader dr = cmd.ExecuteReader();

[风骑士之怒]

引用 1 楼 hjywyj 的回复:

SqlDataReader dr = cmd.ExecuteNonQuery(); => SqlDataReader dr = cmd.ExecuteReader();

正解 ExecuteNonQuery是对insert update delete的执行，你要查询返回结果集，用ExecuteReader

[zfjclark]

把cmd.ExecuteNonQuery();改成cmd.ExecuteReader();

[大_健]

谢谢指点，问题解决！

[大_健]

“ASP.teachercoursedetails_aspx”不包含“GridView1_SelectedIndexChanged”的定义，并且找不到可接受类型为“ASP.teachercoursedetails_aspx”的第一个参数的扩展方法“GridView1_SelectedIndexChanged”(是否缺少 using 指令或程序集引用?) 这个又该怎么改？

[大_健]

#5 问题已解决