C Sharp存储过程第二次运行时超时

Question

我正在通过C sharp调用一个存储过程，由于某种奇怪的原因，它在第二次运行时超时。

调用存储过程的代码：

  private void LoadData()
    {
        BackgroundWorker bw = new BackgroundWorker();
        bw.DoWork += new DoWorkEventHandler(bw_LoadData);
        bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_LoadDataComplete);
        Busy.IsBusy = true;
        Busy.BusyContent = "Loading Data";
        bw.RunWorkerAsync();
    }
    void bw_LoadData(object sender, DoWorkEventArgs e)
    {
            SqlConnection con = new SqlConnection(Logic.GetConnectionString());
            con.Open();
            SqlCommand com = new SqlCommand("spGetUserData", con);
            com.CommandType = System.Data.CommandType.StoredProcedure;
            com.Parameters.Add(new SqlParameter("@UID", uid));


          //Timeouts here on the second run
     SqlDataReader readUserData = com.ExecuteReader();
            while (readUserData.Read())
            {
                    origname = readUserData[0].ToString();
                    origemail = readUserData[1].ToString();
                    origcontact = readUserData[2].ToString();
                    origadd1 = readUserData[3].ToString();
                    origadd2 = readUserData[4].ToString();
                    origstate = readUserData[5].ToString();
                    origcity = readUserData[6].ToString();
                    origzip = readUserData[7].ToString();
                    origcountry = readUserData[8].ToString();

            }
            con.Close();
            con.Dispose();
            e.Result = "OK";

    }
    void bw_LoadDataComplete(object sender, RunWorkerCompletedEventArgs e)
    {
        Busy.IsBusy = false;
        txtFullName.Text =  origname;
      txtEmail.Text  = origemail ;
         txtContact.Text= origcontact;
         txtAdd1.Text= origadd1;
       txtAdd2.Text=  origadd2 ;
        txtState.Text=  origstate;
         txtCity.Text= origcity;
       txtZip.Text =  origzip;
       cboCountry.SelectedItem = origcountry;
    }

窗口加载事件期间的第一个方法调用。。工作符合预期。

       private void Window_Loaded_1(object sender, RoutedEventArgs e)
    {
        LoadData();
    }

发生超时的第二个方法调用。

    void bw_ChangeEmailComplete(object sender, RunWorkerCompletedEventArgs e)
     {
        if (e.Result.ToString() == "OK")
        {
            Busy.IsBusy = false;
          MessageBox.Show("The Email Address was changed successfully", "Message", MessageBoxButton.OK, MessageBoxImage.Information);

        }
        else
        {
            Busy.IsBusy = false;
            MessageBox.Show("An Unexpected Error occured or email already exist", "Error", MessageBoxButton.OK, MessageBoxImage.Error);

        }
        LoadData();

    }

最后是存储过程

          Create Proc [dbo].[spGetUserData]
         @UID varchar(50)
         AS
         Select FullName,Email,Contact,Address1,Address2,State,City,Zip,Country,SubDate,SID
         FROM Users
         Where UID = @UID

更新

尝试后仍然无法工作，也手动处理数据读取器

          using (SqlConnection con = new SqlConnection(Logic.GetConnectionString()))
            {
                using (SqlCommand com = new SqlCommand("spGetUserData", con))
                {
                    com.CommandType = System.Data.CommandType.StoredProcedure;
                    com.Parameters.Add(new SqlParameter("@UID", uid));

                    con.Open();
                    using (var readUserData = com.ExecuteReader())
                    {
                        while (readUserData.Read())
                        {
                                origname = readUserData[0].ToString();
                                origemail = readUserData[1].ToString();
                                origcontact = readUserData[2].ToString();
                                origadd1 = readUserData[3].ToString();
                                origadd2 = readUserData[4].ToString();
                                origstate = readUserData[5].ToString();
                                origcity = readUserData[6].ToString();
                                origzip = readUserData[7].ToString();
                                origcountry = readUserData[8].ToString();

                        }
                    }
                }
            }

Answer 1

您忘记处理DataReader readUserData。

把它放在using语句中：

using (var readUserData = com.ExecuteReader())
{
    while (readUserData.Read())
        ...
}

（对SqlConnection也使用using——using严格优于手动调用Close()和/或Dispose()。）

Answer 2

构建您的代码，以便您的连接、命令、读取器等……自动关闭或处理。请参阅下面的示例。

using (SqlConnection conn = new SqlConnection(--Conn String Here--)
{
    using (SqlCommand cmd = conn.CreateCommand())
    {
        // Set Conn Properties Here
        Conn.Open();
        using (SqlDataReader rdr = cmd.ExecuteReader())
        {
        } // Reader automatically disposed here
    }
} // Conn automatically closed here