多线程的GridView更新

Z时代
2024-01-10
分类：问答

在这里，我在C＃中使用简单的逻辑。我从两个DateTimePicker s中减去天数，并生成与总天数相同的GridView行。我把这个逻辑放在一个Timer中，它的间隔为100毫秒，并自动执行。这适用于90-100行，但如果它变为1000行，那么程序会卡住。所以，我想我需要使用线程。我怎样才能做到这一点？我知道基本的多线程，并试图这样，没有工作：多线程的GridView更新

private void timer1_Tick(object sender, EventArgs e) 
{ 
    myMethod(); 
} 
void myMethod() { 
    ed_Picker.MinDate = sd_Picker.Value; 
    TimeSpan ts = new TimeSpan(); 
    //GridView.Rows.cont 
    label3.Text = ed_Picker.Value.CompareTo(sd_Picker.Value).ToString(); 
    //dateTimePicker2.MinDate = dateTimePicker1.Value; 
    ts = ed_Picker.Value.Subtract(sd_Picker.Value); 
    double d; 
    d = Math.Ceiling(ts.TotalDays) + 1; 
    label3.Text = d.ToString(); 
    DataGridViewRow row = new DataGridViewRow(); 
    GridView.RowCount = Int32.Parse(d.ToString()); // This is key line which I like to put in new Thread 
    for (int i = 1; i <= GridView.RowCount; i++) 
    { 
     GridView.Rows[i - 1].Cells[0].Value = sd_Picker.Value.AddDays(Convert.ToDouble(i - 1)).ToLongDateString(); 
     GridView.Rows[i - 1].Cells[0].ReadOnly = true; 
    } 
    DateTimeConverter dtc = new DateTimeConverter(); 
    TimeSpan ts1 = new TimeSpan(); 
    try 
    { 
     for (int i = 0; i < GridView.RowCount; i++) 
     { 
      ts1 += Convert.ToDateTime(GridView.Rows[i].Cells[2].Value).Subtract(Convert.ToDateTime(GridView.Rows[i].Cells[1].Value)); 
     } 
    } 
    catch (Exception ex) 
    { 
    } 
    label6.Text = ts1.ToString(); 
}

回答：

下面是如何使用BackgroundWorker的做线程的工作和更新UI的总体思路：如果

var worker = new BackgroundWorker {WorkerReportsProgress = true}; 
worker.DoWork += this.ThreadWorkMethod; 
worker.ProgressChanged += this.ThreadProgressMethod; 
worker.RunWorkerAsync(); 
... 
private void ThreadWorkMethod(object sender, DoWorkEventArgs e) 
{ 
    var worker = (BackgroundWorker)sender; 
    for (int i = 0; i = 1000; i++) 
    { 
     // Time consuming operation 
     Thread.Sleep(1000); 
     worker.ReportProgress(i * 100d/1000, i); 
    } 
} 
private void ProgressChanged(object sender, ProgressChangedEventArgs e) 
{ 
    // Here you can access controls, etc. 
    if (e.Progresspercentage == 100) 
    { 
     this.progLabel.Text = "100% Done"; 
    } 
    else 
    { 
     this.progLabel.Text = string.Format("{0}% ({1}/1000)", 
              e.ProgressPercentage, 
              e.UserState); 
    } 
}