（二十二）c#Winform自定义控件-半透明窗体

官网

http://www.hzhcontrols.com

前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨： 企鹅群568015492 

idkey=6e08741ef16fe53bf0314c1c9e336c4f626047943a8b76bac062361bab6b4f8d">

目录

https://www.cnblogs.com/bfyx/p/11364884.html

准备工作

这个窗体继承子基类窗体FrmBase，如果你对FrmBase还不了解，请移步 （十七）c#Winform自定义控件-基类窗体 查看

开始

添加一个Form，命名FrmTransparent，继承自FrmBase

代码不多，直接上完整代码了

 // 版权所有  黄正辉  交流群：568015492   QQ：623128629
 // 文件名称：FrmTransparent.cs
 // 创建日期：2019-08-15 16:05:00
 // 功能描述：FrmTransparent
 // 项目地址：https://gitee.com/kwwwvagaa/net_winform_custom_control
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Text;
 using System.Windows.Forms;

 namespace HZH_Controls.Forms
 {
     public partial class FrmTransparent : FrmBase
     {
         private const int WM_ACTIVATE = ;

         private const int WM_ACTIVATEAPP = ;

         private const int WM_NCACTIVATE = ;

         private const int WA_INACTIVE = ;

         private const int WM_MOUSEACTIVATE = ;

         private const int MA_NOACTIVATE = ;

         public FrmBase frmchild
         {
             get;
             set;
         }
         public FrmTransparent()
         {
             InitializeComponent();

             base.SetStyle(ControlStyles.UserPaint, true);
             base.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
             base.SetStyle(ControlStyles.DoubleBuffer, true);

             MethodInfo method = base.GetType().GetMethod("SetStyle", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.InvokeMethod);
             method.Invoke(this, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.InvokeMethod, null, new object[]
             {
                 ControlStyles.Selectable,
                 false
             }, Application.CurrentCulture);
         }

         protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
             base.ShowInTaskbar = false;
             base.ShowIcon = true;
         }
         [DllImport("user32.dll")]
         private static extern IntPtr SetActiveWindow(IntPtr handle);

         protected override void WndProc(ref Message m)
         {
             if (m.Msg == )
             {
                 m.Result = new IntPtr();
             }
             else
             {
                 if (m.Msg == )
                 {
                     if (((int)m.WParam & ) != )
                     {
                         if (m.LParam != IntPtr.Zero)
                         {
                             FrmTransparent.SetActiveWindow(m.LParam);
                         }
                         else
                         {
                             FrmTransparent.SetActiveWindow(IntPtr.Zero);
                         }
                     }
                 }
                 else if (m.Msg == )
                 {
                 }
                 base.WndProc(ref m);
             }
         }

         private void FrmTransparent_Load(object sender, EventArgs e)
         {
             if (frmchild != null)
             {
                 frmchild.IsShowMaskDialog = false;
                 var dia = frmchild.ShowDialog(this);
                 this.DialogResult = dia;
             }
         }
     }
 }

 namespace HZH_Controls.Forms
 {
     partial class FrmTransparent
     {
         /// <summary>
         /// Required designer variable.
         /// </summary>
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// Clean up any resources being used.
         /// </summary>
         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }

         #region Windows Form Designer generated code

         /// <summary>
         /// Required method for Designer support - do not modify
         /// the contents of this method with the code editor.
         /// </summary>
         private void InitializeComponent()
         {
             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(FrmTransparent));
             this.SuspendLayout();
             //
             // FrmTransparent
             //
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
             this.BackColor = System.Drawing.Color.Black;
             this.ClientSize = new System.Drawing.Size(, );
             this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
             this.Name = "FrmTransparent";
             this.Opacity = 0.5D;
             this.ShowIcon = false;
             this.ShowInTaskbar = false;
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
             this.Text = "FrmTransparent";
             this.Load += new System.EventHandler(this.FrmTransparent_Load);
             this.ResumeLayout(false);

         }

         #endregion
     }
 }

主要就是构造函数和load事件里面的那几句话

用处及效果

用途：一般用在蒙版，比如弹出窗口的时候，显示一个半透明蒙版

最后的话

如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星 星吧