Question

初学：这句话什么意思

private void GridViewBind() { ysconn con1 = new ysconn(); string connStr = ConfigurationManager.ConnectionStrings["connection_string"].ConnectionString; string SqlStr = "Select a.*,b.description FROM test01 a,xueli b where a.xueli=b.code and a.id<1000 and a.id>200"; DataSet ds = new DataSet(); try { SqlConnection conn = new SqlConnection(connStr); if (conn.State.ToString() == "Closed") conn.Open(); SqlDataAdapter da = new SqlDataAdapter(SqlStr, conn); da.Fill(ds, "test01"); if (conn.State.ToString() == "Open") conn.Close(); GridView1.DataSource = ds.Tables[0].DefaultView; GridView1.DataBind(); } catch (Exception ex) { Response.Write("数据库错误，错误原因：" + ex.Message); Response.End(); } }这句话什么意思？ string connStr = ConfigurationManager.ConnectionStrings["connection_string"].ConnectionString;

Answer 1

string connStr = ConfigurationManager.ConnectionStrings["connection_string"].ConnectionString;这句话的意思就是二楼说的。SqlConnection conn = new SqlConnection(connStr); SqlDataAdapter da = new SqlDataAdapter(SqlStr, conn);这里可以改为 if (conn.State.ToString() == "Closed") conn.Open();if (conn.State.ToString() == "Closed") conn.Open(); SqlDataAdapter da = new SqlDataAdapter(SqlStr, conStr); 查看原帖>>

希望采纳