Question

在这里，我在C＃中使用简单的逻辑。我从两个DateTimePicker中减去天数，并生成与总天数相同的GridView行数。我把这个逻辑放在Timer中，它以100毫秒的间隔打勾并自动执行。这适用于90-100行，但如果它行到1000行，则程序会卡住。所以，我在想我需要使用线程。我怎样才能做到这一点？我知道基本的多线程，并试过这个，但是没有用：

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();
}

Answer 1

以下是如何使用BackgroundWorker进行线程工作并更新UI的一般概念：

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);
    }
}

如果您想要收听RunWorkerCompleted事件，您也可以从那里访问控件等。

因此，DoWork方法完全是为了完成硬线程，并调用ReportProgress，以便在需要时可以适当地更改UI。 DoWork方法完成后（返回或完成）将自动调用RunWorkerCompleted事件。

多线程GridView更新

1 个答案: