winform添加任务栏(系统托盘) 要在 WinForm 中添加任务栏，可以使用以下步骤：1.打开 Visual Studio 并创建一个新的 WinForm 应用程序。2.在工具箱中找到 NotifyIcon 控件并将其拖动到窗体上。3.在属性窗口中设置 NotifyIcon 的图标、文本等属性。4.在窗体的 Load 事件处理程序中添加以下代码：private void Form1_Load(object sender, EventArgs e) { notifyIcon1.Visible = true; notifyIcon1.Icon = this.Icon; notifyIcon1.Text = "你的应用程序名称"; }5.在窗体的 Closing 事件处理程序中添加以下代码：private void Form1_FormClosing(object sender, FormClosingEventArgs e) { if (e.CloseReason == CloseReason.UserClosing) { e.Cancel = true; this.Hide(); notifyIcon1.ShowBalloonTip(1000, "提示", "程序已最小化到托盘", ToolTipIcon.Info); } }这样，当用户关闭窗体时，窗体会最小化到任务栏的通知区域，同时 NotifyIcon 会在任务栏的通知区域中显示应用程序的图标和文本。用户可以通过单击图标来恢复窗体。

Winform控件优化之背景透明那些事2：窗体背景透明、镂空穿透、SetStyle、GDI透明效果等 {callout color="#f0ad4e"}简介： 两行代码就能实现Form窗体的(背景)透明效果，它不是Opacity属性的整个窗体透明，TransparencyKey实现窗体的透明、窗体中间部分镂空效果...{/callout}Winform窗体的透明{callout color="#f0ad4e"}此方法也需要.Net Framework 4.0及以上的版本才可以。关键在于TransparencyKey指定和BackColor一样的颜色。窗体默认不支持背景透明设置，指定Color.Transparent无效。TransparencyKey不能取值Color.Black（黑色）。{/callout}两行代码就能实现Form窗体的(背景)透明效果，它不是Opacity属性的整个窗体的透明，而只是背景透明，加上去除边框和标题栏，就能实现很好的背景透明效果。{callout color="#f0ad4e"}// 透明窗体内的透明控件的背景图边缘 会有 BackColor 颜色的白边this.BackColor = Color.LimeGreen;this.TransparencyKey = Color.LimeGreen;{/callout}它会将Form窗体控件设置为透明背景的效果，非常棒。但是会有个小问题，就是透明Form上的透明控件上的图片或背景图片会有一个相应颜色的白边，这算是一个小瑕疵【可以设置窗体的BackColor/TransparencyKey颜色与原本控件上背景图片的颜色尽量一致，尽量避免多出的白边问题】，如下：【这个白边即使指定Color.Empty也无法解除】目前测试，设置背景颜色和TransparencyKey不能取值Color.Black（黑色），它会导致窗体原本的拖动、标题栏中最大最小关闭按钮失效【如果是无边框，则此问题应当不算问题】。BackColor = Color.Lime; // Color.Red\Color.Blue等 TransparencyKey = BackColor;加上无边框窗体的效果：FormBorderStyle = FormBorderStyle.None;理论上设置SupportsTransparentBackColor支持背景透明就可以，但实际无效（猜测，应该是因为主窗体没有父控件的原因，需要有父控件才能生效。不知添加CreateParams的透明设置是否有效）//// 无效 SetStyle(ControlStyles.UserPaint, true); SetStyle(ControlStyles.OptimizedDoubleBuffer, true); SetStyle(ControlStyles.SupportsTransparentBackColor, true); this.BackColor = Color.Transparent; this.TransparencyKey = BackColor;永远显示在窗口最前方，可鼠标穿透的窗体镂空效果通过设置TransparencyKey实现窗体的透明、窗体中间部分镂空，鼠标等可以透过并从透过的部分操作。在一些录屏软件中会需要这种效果，整个窗体镂空部分框选的是录屏的区域，调整区域大小进行适当录屏范围，比如GifCam录屏软件。TopLevel设置Form为顶层窗体，TopMost设置Form始终在最前面。TopLevel=true; TopMost=true; BackColor = Color.Empty; TransparencyKey = BackColor;演示效果如下：TextBox控件的透明TextBox和Form一样，默认不支持设置透明背景色：textBox1.BackColor = Color.Transparent; 会发生异常，控件不支持透明的背景色。通过SetStyle设置支持背景透明。不过TextBox透明也没啥意义，因为透明后看不见文字编辑区域了。 public class TransparentTextBox : TextBox { public TransparentTextBox() { SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, true); BackColor = Color.Transparent; } }背景的不完全透明BackColor = Transparent等实现的都是完全透明，要实现不完全透明，在“完全透明”的基础上，设置BackgroundImage为一张带有百分比透明度的图片。通过图片的透明度，来间接设置控件的透明度CreateParams实现控件透明的设置在继承控件时，通过重写CreateParams，指定透明样式，也可以实现透明。{callout color="#f0ad4e"}该效果只是实现了透明，控件本身、所占位置均存在，且鼠标不能透过操作底层显示出的控件。{/callout}/// <summary> /// A transparent control. /// </summary> public class TransparentPanel : Panel { protected override CreateParams CreateParams { get { CreateParams createParams = base.CreateParams; createParams.ExStyle |= 0x00000020; // WS_EX_TRANSPARENT return createParams; } } }GDI+直接绘制图片或文字实现透明效果（可以针对多图片）此部分参考自 How to Use Transparent Images and Labels in Windows Forms定义通用类绘制图片和文字的通用类，直接继承自Panel，包含抽象方法OnDraw和用于绘制的Graphics对象using System; using System.Drawing; using System.Windows.Forms; using System.Drawing.Drawing2D; /// <span class="code-SummaryComment"><summary></span> /// Use this for drawing custom graphics and text with transparency. /// Inherit from DrawingArea and override the OnDraw method. /// <span class="code-SummaryComment"></summary></span> abstract public class DrawingArea : Panel { /// <span class="code-SummaryComment"><summary></span> /// Drawing surface where graphics should be drawn. /// Use this member in the OnDraw method. /// <span class="code-SummaryComment"></summary></span> protected Graphics graphics; /// <span class="code-SummaryComment"><summary></span> /// Override this method in subclasses for drawing purposes. /// <span class="code-SummaryComment"></summary></span> abstract protected void OnDraw(); }重写CreateParams属性，确保控件实例化时有正确的样式protected override CreateParams CreateParams { get { CreateParams cp = base.CreateParams; cp.ExStyle |= 0x00000020; //WS_EX_TRANSPARENT return cp; } }确保背景不会绘制，需要重写OnPaintBackground方法，并且不进行任何操作；重写OnPaint方法，用于空间绘制自己时调用此处理protected override void OnPaintBackground(PaintEventArgs pevent) { // Don't paint background } protected override void OnPaint(PaintEventArgs e) { // Update the private member so we can use it in the OnDraw method this.graphics = e.Graphics; // Set the best settings possible (quality-wise) this.graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; this.graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear; this.graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality; this.graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; // Calls the OnDraw subclass method OnDraw(); }同时定义一个DrawText方法，用于很方便的绘制文本 #region DrawText helper functions protected void DrawText(string text, Point position) { DrawingArea.DrawText(this.graphics, text, "Microsoft Sans Serif", 8.25f , FontStyle.Regular, Brushes.Black, position); } protected void DrawText(string text, Brush color, Point position) { DrawingArea.DrawText(this.graphics, text, "Microsoft Sans Serif", 8.25f , FontStyle.Regular, color, position); } protected void DrawText(string text, FontStyle style, Point position) { DrawingArea.DrawText(this.graphics, text, "Microsoft Sans Serif", 8.25f , style, Brushes.Black, position); } protected void DrawText(string text, FontStyle style, Brush color, Point position) { DrawingArea.DrawText(this.graphics, text, "Microsoft Sans Serif", 8.25f , style, color, position); } protected void DrawText(string text, float fontSize, FontStyle style, Brush color , Point position) { DrawingArea.DrawText(this.graphics, text, "Microsoft Sans Serif", fontSize , style, color, position); } protected void DrawText(string text, string fontFamily, float fontSize , FontStyle style, Brush color, Point position) { DrawingArea.DrawText(this.graphics, text, fontFamily, fontSize, style, color, position); } static public void DrawText(Graphics graphics, string text, string fontFamily , float fontSize, FontStyle style, Brush color, Point position) { Font font = new Font(fontFamily, fontSize, style); SizeF textSizeF = graphics.MeasureString(text, font); int width = (int)Math.Ceiling(textSizeF.Width); int height = (int)Math.Ceiling(textSizeF.Height); Size textSize = new Size(width, height); Rectangle rectangle = new Rectangle(position, textSize); graphics.DrawString(text, font, color, rectangle); } #endregion使用控件绘制带透明的图片和文本添加一个新类并继承自DrawingArea，在重写的OnDraw方法中实现对图片和文本的绘制class BroculosDrawing : DrawingArea { protected override void OnDraw() { // Gets the image from the global resources Image broculoImage = global::WindowsApplication1.Properties.Resources.broculo; // Sets the images' sizes and positions int width = broculoImage.Size.Width; int height = broculoImage.Size.Height; Rectangle big = new Rectangle(0, 0, width, height); Rectangle small = new Rectangle(50, 50, (int)(0.75 * width), (int)(0.75 * height)); // Draws the two images this.graphics.DrawImage(broculoImage, big); this.graphics.DrawImage(broculoImage, small); // Sets the text's font and style and draws it float fontSize = 8.25f; Point textPosition = new Point(50, 100); DrawText("http://www.broculos.net", "Microsoft Sans Serif", fontSize , FontStyle.Underline, Brushes.Blue, textPosition); } }参考How to: Give Your Control a Transparent Background C# Windows Form Application Transparent button Transparent background on winforms?

winform窗体透明背景实现 因为winform Form窗体的局限性，不允许设置背景色为transparent。所以不能实现透明背景。这里有一个取巧的方法（截Form后的背景）。首先来看下实现效果：想要实现半透明效果只要加个panel ,将panel设置为背景色透明，然后加个遮罩图片就可以了。以下附上实现代码：using System; using System.Drawing; using System.Windows.Forms; namespace WindowsTrans { public partial class Form1 : Form { private Color tr_color = Color.Transparent; private bool b_start = false; bool[] b_visible = null; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { SetBackgroundImageTransparent(); } private void SetBackgroundImageTransparent() { Point pt = this.PointToScreen(new Point(0, 0)); Bitmap b = new Bitmap(this.Width, this.Height); using (Graphics g = Graphics.FromImage(b)) { g.CopyFromScreen(pt, new Point(), new Size(this.Width, this.Height)); } this.BackgroundImage = b; } private void BeginSet() { tr_color = this.TransparencyKey; b_start = true; } private void Setting() { if (b_start) { b_visible = new bool[Controls.Count]; for (int i = 0; i < Controls.Count; i++) { b_visible[i] = Controls[i].Visible; Controls[i].Visible = false; } BackgroundImage = null; BackColor = Color.White; b_start = false; this.TransparencyKey = Color.White; } } private void EndSet() { SetBackgroundImageTransparent(); this.TransparencyKey = tr_color; for (int i = 0; i < Controls.Count; i++) { Controls[i].Visible = b_visible[i]; } b_start = false; } private void Form1_Resize(object sender, EventArgs e) { Setting(); } private void Form1_ResizeBegin(object sender, EventArgs e) { BeginSet(); } private void Form1_ResizeEnd(object sender, EventArgs e) { EndSet(); } private void Form1_Move(object sender, EventArgs e) { Setting(); } } }

Winform 程序多开 在使用应用程序的过程中，经常要求应用程序只能运行一次。如果发现重复开启，应从系统进程列表中搜索到已经开启的进程，并将该进程窗口移到最前端显示。实现过程在 Program.cs 文件的 Program 类中声明两个外部调用函数 [DllImport("User32")] private static extern bool SetForegroundWindow(IntPtr hWnd); [DllImport("User32")] private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);两个外部调用 User32.dll 文件中的函数，其中SetForegroundWindow 主要用于将窗体移动到最前端显示，ShowWindowAsync函数用于显示窗体。修改 main 函数内容static void Main() { bool createdNew; //是否是第一次开启程序 Mutex mutex = new Mutex(false, "Single", out createdNew); //实例化一个进程互斥变量，标记名称Single if (!createdNew) //如果多次开启了进程 { Process currentProcess = Process.GetCurrentProcess();//获取当前进程 foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName)) { //通过进程ID和程序路径获取一个已经开启的进程 if ((process.Id != currentProcess.Id) && (Assembly.GetExecutingAssembly().Location == process.MainModule.FileName)) { //获取已经开启的进程的主窗体句柄 IntPtr mainFormHandle = process.MainWindowHandle; if (mainFormHandle != IntPtr.Zero) { ShowWindowAsync(mainFormHandle, 1); //显示已经开启的进程窗口 SetForegroundWindow(mainFormHandle); //将已经开启的进程窗口移动到前端 } } } mutex.WaitOne(); mutex.ReleaseMutex(); //释放Mutex一次 //MessageBox.Show("进程已经开启"); return; } else { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new MainFrame()); } }Mutex类，该类位于System.Threading命名空间下，主要用于创建线程或进程的互斥变量。本实例创建了一个名为Single的互斥变量，在运行程序时，首先访问该互斥变量，看该变量是否已经被创建，如果已经被创建，说明已经有相同的进程正在运行。

WinForm系统托盘双击打开窗体 this.Visible = true; this.WindowState = FormWindowState.Normal;//双击打开窗体

WinForm关闭窗体时系统托盘不死 在窗体的FormClosing事件添加代码↓notifyIcon.Visible = false;//关闭系统托盘

C# 实现类似QQ的窗体在桌面边缘停靠和隐藏 C# 实现类似QQ的窗体在桌面边缘停靠和隐藏设计思路： 1.使用定时器（Timer）来监控鼠标位置和窗体位置，并实现窗体的停靠和隐藏2.当鼠标拖动窗体时，窗体才有可能根据自身位置决定是否停靠3.如果窗体四周没有接触到屏幕边缘则不会停靠4.如果窗体最小化或最大化了则不存在停靠和隐藏5.如果鼠标拖动窗体时，如果窗体很接近屏幕边缘则自动将其停靠在该边缘，例如窗体离屏幕顶部小于4个像素则自动将其停靠在顶部6.窗体可以在桌面的左侧、右侧和顶部停靠和隐藏7.如果既满足顶部停靠的条件又满足侧面停靠的条件，则规定其向侧面隐藏8.当鼠标位于窗体内部时，窗体不会隐藏9.当鼠标位于窗体外部，窗体根据自身的位置决定是否隐藏10.所谓的隐藏实际上并不是真正的隐藏，而是将整个窗体移出屏幕，仅在屏幕边缘留出一小部分11.所谓的显示隐藏窗体实际上并不是真正的显示，而是将窗体再次移入屏幕12.（存在的问题）默认情况下当用户点击“显示桌面”，会使我们隐藏的窗体被最小化。显然这并不是我们想要的结果，该问题暂时保留效果显示： private void timer1_Tick(object sender, EventArgs e) { timer1.Interval = 200; AutoSideHideOrShow(); } void AutoSideHideOrShow() { int sideThickness = 4;//边缘的厚度，窗体停靠在边缘隐藏后留出来的可见部分的厚度 //如果窗体最小化或最大化了则什么也不做 if (this.WindowState == FormWindowState.Minimized || this.WindowState == FormWindowState.Maximized) { return; } //如果鼠标在窗体内 if (Cursor.Position.X >= this.Left && Cursor.Position.X < this.Right && Cursor.Position.Y >= this.Top && Cursor.Position.Y < this.Bottom) { //如果窗体离屏幕边缘很近，则自动停靠在该边缘 if (this.Top <= sideThickness) { this.Top = 0; } if (this.Left <= sideThickness) { this.Left = 0; } if (this.Left >= Screen.PrimaryScreen.WorkingArea.Width - this.Width - sideThickness) { this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width; } } //当鼠标离开窗体以后 else { //隐藏到屏幕左边缘 if (this.Left == 0) { this.Left = sideThickness - this.Width; } //隐藏到屏幕右边缘 else if (this.Left == Screen.PrimaryScreen.WorkingArea.Width - this.Width) { this.Left = Screen.PrimaryScreen.WorkingArea.Width - sideThickness; } //隐藏到屏幕上边缘 else if (this.Top == 0 && this.Left > 0 && this.Left < Screen.PrimaryScreen.WorkingArea.Width - this.Width) { this.Top = sideThickness - this.Height; } } }

winform窗体透明背景实现 因为winform Form窗体的局限性，不允许设置背景色为transparent。所以不能实现透明背景。这里有一个取巧的方法（截Form后的背景）。首先来看下实现效果： 想要实现半透明效果只要加个panel ,将panel设置为背景色透明，然后加个遮罩图片就可以了。 以下附上实现代码：using System; using System.Drawing; using System.Windows.Forms; namespace WindowsTrans { public partial class Form1 : Form { private Color tr_color = Color.Transparent; private bool b_start = false; bool[] b_visible = null; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { SetBackgroundImageTransparent(); } private void SetBackgroundImageTransparent() { Point pt = this.PointToScreen(new Point(0, 0)); Bitmap b = new Bitmap(this.Width, this.Height); using (Graphics g = Graphics.FromImage(b)) { g.CopyFromScreen(pt, new Point(), new Size(this.Width, this.Height)); } this.BackgroundImage = b; } private void BeginSet() { tr_color = this.TransparencyKey; b_start = true; } private void Setting() { if (b_start) { b_visible = new bool[Controls.Count]; for (int i = 0; i < Controls.Count; i++) { b_visible[i] = Controls[i].Visible; Controls[i].Visible = false; } BackgroundImage = null; BackColor = Color.White; b_start = false; this.TransparencyKey = Color.White; } } private void EndSet() { SetBackgroundImageTransparent(); this.TransparencyKey = tr_color; for (int i = 0; i < Controls.Count; i++) { Controls[i].Visible = b_visible[i]; } b_start = false; } private void Form1_Resize(object sender, EventArgs e) { Setting(); } private void Form1_ResizeBegin(object sender, EventArgs e) { BeginSet(); } private void Form1_ResizeEnd(object sender, EventArgs e) { EndSet(); } private void Form1_Move(object sender, EventArgs e) { Setting(); } } }