使用Microsoft.VisualBasic提供的进度对话框

很多时候，我们需要做一个进度相关的对话框，以显示程序运行的某些状态，做进度对话框的方法很多，我也做了N个版本
今天发一个最简单的版本，这是通过使用Microsoft.VisualBasic.dll提供的Microsoft.VisualBasic.MyServices.Internal.ProgressDialog对象
可惜这个对象声明为internal的，要使用它只能通过反射

代码如下

using System;using System.Collections.Generic;using System.Text;using System.Windows.Forms;namespace WindowFormApplication{ class ProgressDialogWrapper { const string typeName = "Microsoft.VisualBasic.MyServices.Internal.ProgressDialog, Microsoft.VisualBasic, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"; const string userHitCancelEventHandlerTypeName = "Microsoft.VisualBasic.MyServices.Internal.ProgressDialog+UserHitCancelEventHandler, Microsoft.VisualBasic, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"; Type typeofProgressDialog; Form form; System.Reflection.PropertyInfo labelTextProperty; System.Reflection.MethodInfo showProgressDialogMethod; System.Reflection.MethodInfo incrementMethod; System.Reflection.EventInfo userHitCancelEvent; System.Reflection.FieldInfo m_CanceledField; System.Reflection.MethodInfo indicateClosingMethod; System.Reflection.MethodInfo closeDialogMethod; public event EventHandler UserHitCancel; delegate void Method1(int param); delegate bool IsCancel(); delegate void SetTextCall(string text); public ProgressDialogWrapper() { typeofProgressDialog = Type.GetType(typeName); form = (Form)Activator.CreateInstance(typeofProgressDialog); labelTextProperty = typeofProgressDialog.GetProperty("LabelText", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance); showProgressDialogMethod = typeofProgressDialog.GetMethod("ShowProgressDialog"); incrementMethod = typeofProgressDialog.GetMethod("Increment"); indicateClosingMethod = typeofProgressDialog.GetMethod("IndicateClosing"); closeDialogMethod = typeofProgressDialog.GetMethod("CloseDialog"); m_CanceledField = typeofProgressDialog.GetField("m_Canceled", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); userHitCancelEvent = typeofProgressDialog.GetEvent("UserHitCancel"); Type typeofDelegate = Type.GetType(userHitCancelEventHandlerTypeName); userHitCancelEvent.AddEventHandler(form, Delegate.CreateDelegate(typeofDelegate, this, typeof(ProgressDialogWrapper).GetMethod("OnUserHitCancel", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance))); } void OnUserHitCancel() { if (UserHitCancel != null) UserHitCancel(this, EventArgs.Empty); } public string Text { get { return form.Text; } set { SetText(value); } } void SetText(string value) { if (form.InvokeRequired) { form.Invoke(new SetTextCall(SetText), value); } else { form.Text = value; } } public string LabelText { get { return (string)labelTextProperty.GetValue(form, null); } set { SetLabelText(value); } } void SetLabelText(string value) { if (form.InvokeRequired) { form.Invoke(new SetTextCall(SetLabelText), value); } else { labelTextProperty.SetValue(form, value, null); } } public void ShowProgressDialog() { showProgressDialogMethod.Invoke(form, null); } public bool UserCanceledTheDialog { get { return GetUserCanceledTheDialog(); } } bool GetUserCanceledTheDialog() { if (form.InvokeRequired) { return (bool)form.Invoke(new IsCancel(GetUserCanceledTheDialog)); } else { return (bool)m_CanceledField.GetValue(form); } } public void Increment(int incrementAmount) { if (form.InvokeRequired) { Method1 method1 = new Method1(Increment); form.Invoke(method1, incrementAmount); } else { incrementMethod.Invoke(form, new object[] { incrementAmount }); } } public void IndicateClosing() { if (form.InvokeRequired) { form.Invoke(new MethodInvoker(IndicateClosing)); } else { indicateClosingMethod.Invoke(form, null); } } public void CloseDialog() { if (form.InvokeRequired) { form.Invoke(new MethodInvoker(CloseDialog)); } else { if (form.IsHandleCreated) { closeDialogMethod.Invoke(form, null); } else { form.Close(); } } } }}

里面涉及到了反射，跨线程调用的问题，如果在使用中发现问题，只要依葫芦画瓢修改一下就可以了
 调用例子

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Threading;namespace WindowFormApplication{ public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { ProgressDialogWrapper progressDialog = new ProgressDialogWrapper(); progressDialog.UserHitCancel += new EventHandler(progressDialog_UserHitCancel); Thread thread = new Thread(delegate() { progressDialog.Text = "进度对话"; for (int i = 0; i < 100; i++) { if (!progressDialog.UserCanceledTheDialog) { progressDialog.LabelText = "正在复制..."; Application.DoEvents(); progressDialog.Increment(1); for (int j = 0; j < 10000; j++) { Application.DoEvents(); } } else { break; } } progressDialog.CloseDialog(); }); thread.Start(); progressDialog.ShowProgressDialog(); } void progressDialog_UserHitCancel(object sender, EventArgs e) { ProgressDialogWrapper progressDialog = sender as ProgressDialogWrapper; MessageBox.Show("Canceled!"); } }}

比较简单吧
附上整个工程，点击下载, 里面还包含了我的上一篇文章《Microsoft.VisualBasic类库的一个小Bug.txt》的历程

http://download.csdn.net/source/1200408

 

                                                                                                       作者：Superlight