思路

1. BaseForm類繼承Form class：通過拓展BaseForm類新增控制元件,使用時繼承BaseForm
2. 等待控制元件作用：
   
   • 禁用主窗體控制元件；
   • 顯示進度條控制元件
3. 非同步呼叫： try{} finally{}進行控制元件的回收

實現

BaseForm

public partial class BaseForm : Form
{
    private ProgressBar progressBar = null;
    /// <summary>
    /// Show ProgressBarControl when waiting...
    ///
 
 </summary>
    public virtual ProgressBar ProgressBarControl
    {
        get { return this.progressBar; }
        set { this.progressBar = value; }
    }

    public BaseForm()
    {
        InitializeComponent();
    }


}

BaseFormEx

using System;
using System.Collections.Generic;
using System.Diagnostics
 
;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RoadmapSupporter
{
    public static class BaseFormEx
    {

        public static void BeginWait(this BaseForm baseForm)
        {
            Debug.Assert(baseForm != null);
 


            baseForm.Invoke((MethodInvoker)delegate
            {
                baseForm.Enabled = false;
                if (baseForm.ProgressBarControl == null)
                {
                    baseForm.ProgressBarControl = new ProgressBar();
                    baseForm.Controls.Add(baseForm.ProgressBarControl);
                    baseForm.ProgressBarControl.Size = new Size(246, 36);
                    baseForm.ProgressBarControl.Name = "progressBar";
                    baseForm.ProgressBarControl.Visible = true;
                    baseForm.ProgressBarControl.Style = ProgressBarStyle.Marquee;
                    baseForm.ProgressBarControl.Location = new Point(baseForm.Width / 2 - baseForm.ProgressBarControl.Width / 2, baseForm.Height / 2 - baseForm.ProgressBarControl.Height);
                    baseForm.ProgressBarControl.BringToFront();
                }
            });
        }

        public static void EndWait(this BaseForm baseForm)
        {
            Debug.Assert(baseForm != null);

            baseForm.Invoke((MethodInvoker)delegate
            {
                if (baseForm.ProgressBarControl != null)
                {
                    if (baseForm.Controls.Contains(baseForm.ProgressBarControl))
                        baseForm.Controls.Remove(baseForm.ProgressBarControl);
                    baseForm.ProgressBarControl.Dispose();
                    baseForm.ProgressBarControl = null;

                    baseForm.Enabled = true;
                }
            });
        }
    }
}

Call

public partial class RoadmapSupporter : BaseForm
{
    public void paradigm{
        this.BeginWait();
        ThreadPool.QueueUserWorkItem(arg =>
        {
            try
            {
                if (CompareInfo(_PublishingToolFileName, _PreviousFileName, ref _Epics))
                {
                    webBrowserShow.DocumentText = FormatEmail(_Epics);
                }
                else
                {
                    Invoke((MethodInvoker)delegate { MessageBox.Show(this, "An Error occur when comparing epics", "Compare Epics"); });
                }
            }
            finally
            {
                this.EndWait();
            }
        });
    }
}