一窗口背景

实现方法：
① 自己绘制一个圆角矩形背景；
② 将外围区域透明化：

this.BackColor=Color.White;
this.TransparencyKey=Color.White;

二窗口自动关闭

实现：
① 显示窗口时，同时开启定时器；
② 约1.5秒，关闭窗口；
③ 同时，在窗口显示的最后0.5秒控制窗口谈出；
子窗体代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 窗口自动关闭
{public partial class Form2 : Form{private string message;//定时器：自动关闭窗口private System.Windows.Forms.Timer timer;private int count;//计数，窗口弹出计算public Form2(){this.FormBorderStyle = FormBorderStyle.None;this.BackColor = Color.White;this.TransparencyKey = Color.White;//指定透明区域的颜色this.ShowInTaskbar = false;}//owner可以是Form窗体也可以是控件public void ShowMessage(Control owner, string message){this.message = message;this.StartPosition = FormStartPosition.Manual;this.Size = MeasureSize(message);//找到owner所在的顶级窗口Form form = owner.FindForm();this.Owner = form;//form2窗口相对主窗口居中Rectangle fr = new Rectangle(form.Location, form.Size);int x = fr.X + (fr.Width - this.Width) / 2;int y = fr.Y + (fr.Height - this.Height) / 2;this.Location = new Point(x, y);this.Show();//启动定时器if (timer == null){timer = new System.Windows.Forms.Timer();timer.Interval = 200;timer.Tick += this.OnTimer;this.count = 15;timer.Start();}}private void OnTimer(object sender, EventArgs e){count -= 2;if (count <= 0){//计时结束，关闭窗口timer.Dispose();this.Dispose();return;}//Opacity 窗口整体的透明度this.Opacity = count / 5.0;}protected override bool ShowWithoutActivation{get { return true; }}public Size MeasureSize(string str){StringFormat sf = new StringFormat();sf.Alignment = StringAlignment.Center;sf.LineAlignment = StringAlignment.Center;//按最大宽度300进行测试，计算文本显示所需的尺寸Graphics g = this.CreateGraphics();SizeF size = g.MeasureString(str, this.Font, 300);g.Dispose();//最小宽度120，最小高度50if (size.Width < 100) size.Width = 100;if (size.Height < 50) size.Height = 50;//适当放大一点，留出padding空间return new Size((int)size.Width + 10, (int)size.Height + 4);}protected override void OnPaint(PaintEventArgs e){base.OnPaint(e);Graphics g = e.Graphics;int w = this.Width, h = this.Height;Rectangle rect = new Rectangle(0, 0, w, h);rect.Inflate(-4, -4);//平滑绘制，反锯齿g.SmoothingMode = SmoothingMode.HighQuality;g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;Color bgColor = Color.Orange;Color textColor = Color.FromArgb(0x30, 0x30, 0x30);using (Brush brush = new SolidBrush(bgColor)){GraphicsPath path = RoundRectangle(rect, 10);g.FillPath(brush, path);}if (message != null){StringFormat sf = new StringFormat();sf.Alignment = StringAlignment.Center;sf.LineAlignment = StringAlignment.Center;Brush brush = new SolidBrush(Color.Black);g.DrawString(message, this.Font, brush, rect, sf);brush.Dispose();}}public static GraphicsPath RoundRectangle(Rectangle rect, int r){int x = rect.X, y = rect.Y;int w = rect.Width;int h = rect.Height;if (r > w / 2) r = w / 2;if (r > h / 2) r = h / 2;GraphicsPath path = new GraphicsPath();path.AddArc(new Rectangle(x, y, r, r), 180, 90);path.AddArc(new Rectangle(x + w - r, y, r, r), 270, 90);path.AddArc(new Rectangle(x + w - r, y + h - r, r, r), 0, 90);path.AddArc(new Rectangle(x, y + h - r, r, r), 90, 90);path.CloseFigure();return path;}}
}

主窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 窗口自动关闭
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Form2 form2 = new Form2();form2.ShowMessage(button1, "中国人民解放军");}}
}

三 AfToast

Af.Winform.AfToast短消息提示
短消息提示是一个常用功能，可以直接加到项目中使用。
工具方法：以static形式封装一些快捷方法。
AfToast.show(owner,message)
AfToast.show(owner,bgColor,message)

子窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 短消息提示
{public partial class Af : Form{private string message;//定时器：自动关闭窗口private System.Windows.Forms.Timer timer;private int count;//计数，窗口谈出计算Color bgColor = Color.FromArgb(0xFF, 0xFF, 0XE0);Color textColor = Color.FromArgb(0x30, 0x30, 0x30);public Af(){this.FormBorderStyle = FormBorderStyle.None;this.BackColor = Color.White;this.TransparencyKey = Color.White;this.ShowInTaskbar = false;}public void ShowMessage(Control owner,string message){this.message = message;this.StartPosition = FormStartPosition.Manual;this.Size = MeasureSize(message);//找到owner所在的顶级窗口Form form = owner.FindForm();this.Owner = form;//使Toast窗口相对主窗口居中Rectangle fr = new Rectangle(form.Location, form.Size);int x = fr.X + (fr.Width - this.Width) / 2;int y = fr.Y + (fr.Height - this.Height) / 2;this.Location = new Point(x, y);this.Show();//启动定时器if(timer==null){timer = new System.Windows.Forms.Timer();timer.Interval = 200;timer.Tick += this.OnTimer;this.count = 15;timer.Start();}}//定时器控制窗口的自动关闭private void OnTimer(object sender ,EventArgs e){count -= 2;if(count<=0){//计时结束，关闭窗口timer.Dispose();this.Dispose();return;}//Opacity窗口整体的透明度this.Opacity = count / 5 ;}//焦点控制：本窗口不剥夺主窗口的焦点//否则，当Toast窗口激活时，主窗口焦点被剥夺protected override bool ShowWithoutActivation{get { return true; }}public Size MeasureSize(string str){StringFormat sf = new StringFormat();sf.Alignment = StringAlignment.Center;sf.LineAlignment = StringAlignment.Center;//按最大宽度300进行测算，计算文本显示所需的尺寸Graphics g = this.CreateGraphics();SizeF size = g.MeasureString(str, this.Font, 300);g.Dispose();//最小宽度120，最小高度50if (size.Width < 100) size.Width = 100;if (size.Height < 50) size.Height = 50;return new Size((int)size.Width + 10, (int)size.Height + 4);}protected override void OnPaint(PaintEventArgs e){base.OnPaint(e);Graphics g = e.Graphics;int w = this.Width, h = this.Height;Rectangle rect = new Rectangle(0, 0, w, h);rect.Inflate(-4, -4);//平滑绘制，反锯齿g.SmoothingMode = SmoothingMode.HighQuality;g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;using(Brush brush=new SolidBrush(bgColor)){GraphicsPath path = RoundRectangle(rect, 10);g.FillPath(brush, path);}if(message!=null){StringFormat sf = new StringFormat();sf.Alignment = StringAlignment.Center;sf.LineAlignment = StringAlignment.Center;Brush brush = new SolidBrush(textColor);g.DrawString(message, this.Font, brush, rect, sf);brush.Dispose();}}public static GraphicsPath RoundRectangle(Rectangle rect,int r){int x = rect.X, y = rect.Y;int w = rect.Width;int h = rect.Height;if (r > w / 2) r = w / 2;if (r > h / 2) r = h / 2;GraphicsPath path = new GraphicsPath();path.AddArc(new Rectangle(x, y, r, r), 180, 90);path.AddArc(new Rectangle(x + w - r, y, r, r), 270, 90);path.AddArc(new Rectangle(x + w - r, y + h - r, r, r), 0, 90);path.AddArc(new Rectangle(x, y + h - r, r, r), 90, 90);path.CloseFigure();return path;}//添加一些更容易使用的工具方法public static void Show(Control owner ,string message){Af t = new Af();t.ShowMessage(owner, message);}public static void Show(Control owner,Color bgColor,string message){Af t = new Af();t.bgColor = bgColor;t.ShowMessage(owner, message);}}
}

父窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 短消息提示
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Af.Show(this, "中国人民解放军");}}
}

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C# 窗口背景短消息提示

一窗口背景

二窗口自动关闭

三 AfToast

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