Winform等待窗口的实现（附源代码）

在开发Winform程序的时候，经常会用到等待窗口（如网络通讯、数据库连接等需要一定时间来执行的操作），这样可以给用户提供更好的体验。

         等待窗口的主要功能是一边执行需要等待的操作，一边显示一个等待界面。当执行完毕时等待界面消失。用户可以提前取消操作，还可以设置操作的最大等待时间，若超过指定时间仍没完成操作可结束当前操作。等待窗口的操作处理内容可用λ表达式，在后面的应用实例中可看到使用方法。

         实现界面如下图：

 

         等待界面主要包含的部分：

• 等待图片；
• 等待消息文字("正在处理数据，请稍后...")：可自定义；
• 计时器：可设置不显示；
• 取消返回按钮：可设置不显示；
• 另外等待窗口显示和关闭的时候都有渐变的一个简单特效，等待窗口的颜色是在一定范围内随即的。

等待窗口实现代码：

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001	using System;

002	using System.Collections.Generic;

003	using System.ComponentModel;

004	using System.Data;

005	using System.Drawing;

006	using System.Linq;

007	using System.Text;

008	using System.Windows.Forms;

009

010	namespace WinForm_Test

011

{

012	public partial class frmWaitingBox : Form

013

{

014	#region Properties

015	private int _MaxWaitTime;

016	private int _WaitTime;

017	private bool _CancelEnable;

018	private IAsyncResult _AsyncResult;

019	private EventHandler<EventArgs> _Method;

020	private bool _IsShown = true;

021	private readonly int _EffectCount = 10;

022	private readonly int _EffectTime = 500;

023	/// <summary>

024	/// 控制界面显示的特性

025	/// </summary>

026	private Timer _Timer;

027	public string Message { get; private set; }

028	public int TimeSpan { get; set; }

029	public bool FormEffectEnable { get; set; }

030	#endregion

031

032	#region frmWaitingBox

033	public frmWaitingBox(EventHandler<EventArgs> method,int maxWaitTime,string waitMessage,bool cancelEnable,bool timerVisable)

034

{

035	maxWaitTime *= 1000;

036	Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);

037

}

038	public frmWaitingBox(EventHandler<EventArgs> method)

039

{

040	int maxWaitTime=60*1000;

041	string waitMessage = "正在处理数据，请稍后...";

042	bool cancelEnable=true;

043	bool timerVisable=true;

044	Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);

045

}

046	public frmWaitingBox(EventHandler<EventArgs> method, string waitMessage)

047

{

048	int maxWaitTime = 60 * 1000;

049	bool cancelEnable = true;

050	bool timerVisable = true;

051	Initialize(method, maxWaitTime, waitMessage, cancelEnable, timerVisable);

052

}

053	public frmWaitingBox(EventHandler<EventArgs> method, bool cancelEnable, bool timerVisable)

054

{

055	int maxWaitTime = 60*1000;

056	string waitMessage = "正在处理数据，请稍后...";

057	Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);

058

}

059	#endregion

060

061	#region Initialize

062	private void Initialize(EventHandler<EventArgs> method, int maxWaitTime,string waitMessage,bool cancelEnable, bool timerVisable)

063

{

064	InitializeComponent();

065	//initialize form

066	this.FormBorderStyle = FormBorderStyle.None;

067	this.StartPosition = FormStartPosition.CenterParent;

068	this.ShowInTaskbar = false;

069	Color[] c = GetRandColor();

070	this.panel1.BackColor = c[0];

071	this.BackColor = c[1];

072	this.labMessage.Text = waitMessage;

073	_Timer = new Timer();

074	_Timer.Interval = _EffectTime/_EffectCount;

075	_Timer.Tick += _Timer_Tick;

076	this.Opacity = 0;

077	FormEffectEnable = true;

078

//para

079	TimeSpan = 500;

080	Message = string.Empty;

081	_CancelEnable = cancelEnable;

082	_MaxWaitTime = maxWaitTime;

083	_WaitTime = 0;

084	_Method = method;

085	this.pictureBoxCancel.Visible = _CancelEnable;

086	this.labTimer.Visible = timerVisable;

087	this.timer1.Interval = TimeSpan;

088	this.timer1.Start();

089

}

090	#endregion

091

092	#region Color

093	private Color[] GetRandColor()

094

{

095	int rMax = 248;

096	int rMin = 204;

097	int gMax = 250;

098	int gMin = 215;

099	int bMax = 250;

100	int bMin = 240;

101	Random r = new Random(DateTime.Now.Millisecond);

102	int r1 = r.Next(rMin, rMax);

103	int r2 = r1 + 5;

104	int g1 = r.Next(gMin, gMax);

105	int g2 = g1 + 5;

106	int b1 = r.Next(bMin, bMax);

107	int b2 = b1 + 5;

108	Color c1 = Color.FromArgb(r1, g1, b1);

109	Color c2 = Color.FromArgb(r2, g2, b2);

110	Color[] c = { c1, c2 };

111

return c;

112

}

113	#endregion

114

115	#region Events

116	private void btnCancel_Click(object sender, EventArgs e)

117

{

118	this.Message = "您结束了当前操作！";

119	this.Close();

120

}

121

122	private void timer1_Tick(object sender, EventArgs e)

123

{

124	_WaitTime += TimeSpan;

125	this.labTimer.Text = string.Format("{0}秒", _WaitTime / 1000);

126	if (!this._AsyncResult.IsCompleted)

127

{

128	if (_WaitTime > _MaxWaitTime)

129

{

130	Message = string.Format("处理数据超时{0}秒，结束当前操作！", _MaxWaitTime / 1000);

131	this.Close();

132

}

133

}

134

else

135

{

136	this.Message = string.Empty;

137	this.Close();

138

}

139

140

}

141

142	private void frmWaitingBox_Shown(object sender, EventArgs e)

143

{

144	_AsyncResult = _Method.BeginInvoke(null, null, null, null);

145

//Effect

146	if (FormEffectEnable)

147

{

148	_Timer.Start();

149

}

150

else

151	this.Opacity = 1;

152

}

153	private void frmWaitingBox_FormClosing(object sender, FormClosingEventArgs e)

154

{

155	if (FormEffectEnable)

156

{

157	if(this.Opacity>=1)

158	e.Cancel = true;

159	_Timer.Start();

160

}

161

}

162	private void _Timer_Tick(object sender, EventArgs e)

163

{

164	if (_IsShown)

165

{

166	if (this.Opacity >= 1)

167

{

168	_Timer.Stop();

169	_IsShown = false;

170

}

171	this.Opacity += 1.00 / _EffectCount;

172

}

173

else

174

{

175	if (this.Opacity <= 0)

176

{

177	_Timer.Stop();

178	_IsShown = true;

179	this.Close();

180

}

181	this.Opacity -= 1.00 / _EffectCount;

182

}

183

}

184	#endregion

185

186

187

}

188

}

应用实例代码：

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01	string res;

02	DataTable dt=null;

03	frmWaitingBox f = new frmWaitingBox((obj,args)=>

04

{

05	Thread.Sleep(5000);

06	string sql = "SELECT * FROM [test].[dbo].[studentInfo]";

07	SQLHelper sqlHelper=new SQLHelper();

08	dt = sqlHelper.ExecuteSqlStr(sql,out res);

09

});

10	f.ShowDialog(this);

11

12	dataGridView1.DataSource = dt;

源码下载：下载地址——（https://files.cnblogs.com/anding/WinForm_Test1.rar）