在執行 SQL 查詢時顯示進度條

Question

我想在從 SQL 數據庫讀取數據時通知用戶，我決定創建一個帶有進度條的表單，但它不起作用 - 可能是因為需要一個線程。 我想以編程方式創建表單

        ProgressBar pb = new ProgressBar();

        pb.MarqueeAnimationSpeed = 30;
        pb.Style = ProgressBarStyle.Marquee;
        pb.Dock = DockStyle.Fill;

        progressForm.ClientSize = new Size(200, 50);
        progressForm.FormBorderStyle = FormBorderStyle.FixedDialog;
        progressForm.StartPosition = FormStartPosition.CenterScreen;
        progressForm.Controls.Add(pb);
        progressForm.ControlBox = false;
        progressForm.TopMost = true;

        progressForm.Show();  
        //do data processes here (all queries and executes)
        progressForm.close();

如何修改上面的代碼以實現我的既定目標？

編輯：順便說一句，我想在我的項目中的每個數據函數中使用這個進度條表單。 例如：fillGrid、runQuery..

@Will 非常感謝您的回答。 我的意思是如何使用類的函數，例如我的 gridFill 函數在該連接類中：

 class ConnectionClass
    {
       public static SqlConnection connection = new SqlConnection();

    public string sorgu;
    public static string server;
    public static string userId;
    public static string catalog;
    public static string password;
    public static string accessMethod;
    public DataSet ds = new DataSet();
    Form progressForm = new Form();       

    public bool Open()
    {
        try
        {
            if (connection.State != ConnectionState.Open)
            {

                connection.ConnectionString = "Data Source = " + server + ";" +
                                              "Initial Catalog=" + catalog + ";" +
                                              "User ID=" + userId + ";" +
                                              "Password=" + password + ";" +
                                              "Connect Timeout=0";

                connection.Open();
                return true;
            }
            else
            {
                return true;
            }


        }
        catch (Exception ex)
        {
            MessageBox.Show("System message:" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return false;
        }

    }

    public DataTable Dt(string query)
    {
        DataTable dt = new DataTable();
        if (Open())
        {
            SqlDataAdapter da = new SqlDataAdapter(query, connection);
            try
            {   
                //progressForm.Showdialog()  is this possible???
                da.Fill(dt);
                //progressForm.close(); ??
            }
            catch (Exception ex)
            {
                MessageBox.Show("Sistem Mesajı:" + ex.Message, "Hata", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }         
        return dt;
    }

    public bool Run(string query, string hataMsj)
    {
        Form activeForm = Form.ActiveForm;
        query = " SET DATEFORMAT DMY " + query;

        SqlCommand sc = new SqlCommand(query, connection);
        try
        {
            Open();
            sc.ExecuteNonQuery();
            return true;
        }           
        catch (Exception )
        {
            return false;
        }
    }

    public void fillComboBox(string sorgu, ComboBox cb, string text, string value)
    {
        DataTable dt = Dt(sorgu);

        cb.DisplayMember = text;
        cb.ValueMember = value;
        cb.DataSource = dt;
        if (cb.Items.Count > 0)
        {
            cb.SelectedIndex = 0;
        }

    }

    public int fillGridView(string sorgu, DataGridView dgv)
    {
        DataTable dtGrvw = Dt(sorgu);
        dgv.DataSource = dtGrvw;
        return 1;
    }       
    }

和來自另一個表單（類）的示例查詢

   ConnectionClass cc = new ConnectionClass();

    query= "  INSERT INTO tblPersonel (" +
                                          " [sqlUserName] " +
                                          ",[personelNo] " +
                                          ",[ad] " +
                                          ",[soyad] " +
                                          ",[departmanId] " +
                                          ",[emailadres] " +
                                          ",[tcKimlikNo],[kangurubu],[dokumaciNo])VALUES" +
                                          "('" + tbSqlUserName.Text +
                                          "','" + tbPersonelNo.Text +
                                          "','" + tbAd.Text +
                                          "','" + tbSoyad.Text +
                                          "','" + cbDepartman.SelectedValue.ToString() +
                                          "','" + tbMail.Text +
                                          "','" + tbKimlikno.Text + 
                                          "','" + tbKangrubu.Text + 
                                          "','" + tbDokumaciNo.Text + "' ) ";
                    if (cc.Run(query, "Unexpected error on insert new person"))
                    {
                        fillGrid();
                        this.Close();

                    }

    public void fillGrid()
    {
        query= " select * from View_Personel order by personelNo desc";
        cc.fillGridView(query, gridviewPersonel);
    }

我無法想象如何在 bw_DoWork 事件中使用它。 因為我的函數有參數。(query, gridview) 當我從另一個類調用它時，我可以將它與參數一起使用...

ps： 這個方法對我來說很好，但沒有用。 我沒有理解問題

Answer 1

使用 BackgroundWorker 類來填充您的 DataGrid。

     Form progressForm;

     public void func() {
        BackgroundWorker bw = new BackgroundWorker ();
        bw.DoWork += new DoWorkEventHandler (bw_DoWork);
        bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler (bw_RunWorkerCompleted);

        progressForm = new Form ();

        ProgressBar pb = new ProgressBar ();

        pb.MarqueeAnimationSpeed = 30;
        pb.Style = ProgressBarStyle.Marquee;
        pb.Dock = DockStyle.Fill;

        progressForm.ClientSize = new Size (200, 50);
        progressForm.FormBorderStyle = FormBorderStyle.FixedDialog;
        progressForm.StartPosition = FormStartPosition.CenterScreen;
        progressForm.Controls.Add (pb);
        progressForm.ControlBox = false;
        progressForm.TopMost = true;

        progressForm.Show ();

        string queryString = "SELECT ...."; // fill query string here
        var params = new KeyValuePair<GridControl, string>(sorgu, queryString);
        bw.RunWorkerAsync (params);
    }

    void bw_DoWork (object sender, DoWorkEventArgs e) {
        KeyValuePair<GridControl, string> params = e.Argument as KeyValuePair<GridControl, string>;
        ConnectionClass cc = new Connection Class();
        cc.fillGrid(params.Value, params.Key);
    }

    void bw_RunWorkerCompleted (object sender, RunWorkerCompletedEventArgs e) {
        progressForm.Close (); //
    }

可以向 BackgroundWorker 發送參數。 如果您需要多個參數，您可以發送一個包含您需要的任何對象的元組。

編輯：如果您使用的是 3.5，則可以改用 KeyValuePair。 為此更新了代碼。

Answer 2

正如Ash Burlaczenko建議的那樣，您必須為此目的使用BackgroundWorker 。

但是，由於您想將它與 ProgressBar 聯系起來，我建議您查看有關 CodeProject： ProgressWorker 的這篇文章。

它相當容易使用，它會自動為您更新進度條。 您所要做的就是記住不時調用ProgressWorker.ReportProgress方法以更新關聯的進度條。