我制作了一个表格,起着进度条的作用,这是我制作的代码
public partial class PXProgressBar : Form
{
public delegate bool CancelEvent();
public event CancelEvent cancel_e;
public Boolean ProcessCancelled
{
get;
set;
}
public PXProgressBar(bool EnableCancel)
{
InitializeComponent();
ProcessCancelled = false;
progressBar1.Minimum = 0;
if (!EnableCancel)
Cancelbtn.Visible = false;
}
public void increament(int step)
{
if (progressBar1.Value < progressBar1.Maximum-1)
{
progressBar1.Value++;
progressBar1.Caption = progressBar1.Value.ToString() + " of " + progressBar1.Maximum;
progressBar1.Refresh();
}
else
{
progressBar1.Value++;
progressBar1.Caption = progressBar1.Value.ToString() + " of " + progressBar1.Maximum;
if (this.TopMost)
this.TopMost = false;
this.Update();
this.Hide();
this.WindowState = FormWindowState.Minimized;
// this.Dispose();
}
}
public void SetMaximum(int MaximumValue)
{
if (MaximumValue <= 0)
{
progressBar1.Maximum = 0;
return;
}
if (progressBar1.Minimum != 0 && MaximumValue < progressBar1.Minimum)
{
progressBar1.Maximum = progressBar1.Minimum;
return;
}
progressBar1.Maximum = MaximumValue;
}
public void SetMinimum(int MinimumValue)
{
progressBar1.Value = 0;
if (MinimumValue <= 0)
{
progressBar1.Minimum = 0;
return;
}
if (progressBar1.Maximum != 100 && MinimumValue > progressBar1.Maximum)
{
progressBar1.Minimum = progressBar1.Maximum;
return;
}
progressBar1.Minimum= MinimumValue;
}
public void SetTitle(string ProcessTitle)
{
this.ProgressTitlelb.Text =ProcessTitle;// ProcessTitle;
//this.ProgressTitlelb.Left = (this.panel1.Width - this.ProgressTitlelb.Width) / 2;
//this.ProgressTitlelb.Top = (this.panel1.Height - this.ProgressTitlelb.Height) / 2;
this.Update();
}
private void Cancelbtn_Click(object sender, EventArgs e)
{
ProcessCancelled = true;
bool disposeRequired =cancel_e();
if(disposeRequired)
this.Dispose();
}
private void PXProgressBar_Shown(object sender, EventArgs e)
{
this.Update();
}
}
我通过此代码调用表格
if (ProgressBar == null)
ProgressBar = new PXProgressBar(true);
ProgressBar.SetTitle("Saving ...");
ProgressBar.SetMinimum(0);
ProgressBar.SetMaximum(100);
ProgressBar.TopMost = true;
ProgressBar.Show();
Application.DoEvents();
关于过去的几行是在一个线程中称为
但是当我运行它时,窗体挂起,因此我无法在窗体中设置“取消”按钮,以允许用户取消操作
最佳答案
您需要确保GUI元素是在主表单线程上创建的,而不是从单独的线程创建的。因此,您需要获取正在执行工作的线程,以使主表单线程显示和更新进度条。这将需要一些重构。
因此,在您的工作线程中:
void DoWork () // of whatever it's called
{
main_form.CreateProgressBar ();
while (doing stuff)
{
main_form.IncrementProgressBar ();
do stuff
}
main_form.DestroyProgressBar ();
}
并以主要形式:
delegate void Callback ();
void CreateProgressBar ()
{
if (InvokeRequired)
{
Invoke (new Callback (CreateProgressBar));
}
else
{
progress_bar = CreateProgressBar ();
}
}
void IncrementProgressBar ()
{
if (InvokeRequired)
{
Invoke (new Callback (IncrementProgressBar ));
}
else
{
progress_bar.IncrementProgressBar ();
}
}
void DestroyProgressBar ()
{
if (InvokeRequired)
{
Invoke (new Callback (DestroyProgressBar));
}
else
{
progress_bar.Close ();
progress_bar = null;
}
}
InvokeRequired
确定调用线程是否与GUI线程相同。如果调用线程不是GUI线程,则Invoke
用于更改线程上下文。这是同步版本,在调用的方法完成之前不会完成。有一个称为BeginInvoke
的异步版本,但这实际上并不需要您做。