ExecuteReader：连接属性尚未初始化。浏览器游戏

Question

我们遇到一些问题，显示玩家在数据库中的体验。

这是一个学校项目，想一些提示:)

SqlConnection connection = new SqlConnection(WebConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString); 
SqlCommand CheckExp = new SqlCommand("SELECT Experience FROM Player WHERE UserID=@uid"); 

string uID = Session["userID"].ToString(); 

CheckExp.Parameters.AddWithValue("@uid", uID); 

     try 
     { 

      connection.Open(); 
      SqlDataReader ExpReader = null; 
      ExpReader = CheckExp.ExecuteReader(); 

      if (ExpReader.Read()) 
      { 
       Label6.Text = ExpReader["Experience"].ToString(); 
      } 

     } 
     catch (Exception ex) 
     { 
      Label6.Text=(ex.Message); 

     } 

     finally 
     { 
      connection.Close(); 
     } 

Answer 1

你没有连接您的SqlConnection和SqlCommand。

只需将您的连接定义为第二个参数即可;

SqlCommand CheckExp = new SqlCommand("SELECT Experience FROM Player WHERE UserID=@uid", connection); 

或者你可以指定你的SqlCommand.Connection属性;

CheckExp.Connection = connection;