我想在从SQL数据库中读取数据时通知用户 我决定使用进度条创建一个表单，但它不起作用 - 可能是因为需要一个线程。我想以编程方式创建表单
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();
如何修改上述代码以实现我的既定目标？
编辑：顺便说一句，我想在项目的每个数据函数中使用这个进度条表单。例如：fillGrid，runQuery ..
@非常感谢你的回答。我的意思是我如何使用类的函数，例如我的gridFill函数在该连接类中：
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;
}
}
来自另一个表单（类）的示例查询
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);
}
我无法想象如何在bw_DoWork事件中使用它。因为我的函数有参数。（查询，gridview）当我从另一个类调用它时我可以使用参数...
P.S。 ：this Method对我来说非常好，但它没有用。我不明白这个问题
答案 0 :(得分：4)
使用BackgroundWorker类填充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 (); //
}
可以将参数发送到BackgroundWorker。如果需要多个参数，可以发送包含所需对象的元组。
编辑：如果您使用的是3.5，则可以使用KeyValuePair。代码已更新。
答案 1 :(得分：0)
正如Ash Burlaczenko推荐的那样，您必须为此目的使用BackgroundWorker。
但是，由于您希望将其与ProgressBar绑定，我建议您查看CodeProject上的这篇文章：ProgressWorker。
它非常易于使用，它会自动为您更新进度条。您所要做的就是记住不时调用ProgressWorker.ReportProgress方法以更新相关的进度条。