C#关于Windows窗体最大化所引起的闪烁问题的处理经验

1：窗体最大化前，窗体最好没有任何控件在显示，并且控件不要有背景图，等窗体最大化后才显示控件以及加载背景图。

2：最大化源码（从网上搜回来的：）

using System;  
using System.Windows.Forms;  
using System.Drawing;  
using System.Runtime.InteropServices;  
  
namespace XXXX.Definition  
{  
    public class WinApi  
    {  
        [DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]  
        public static extern int GetSystemMetrics(int which);  
  
        [DllImport("user32.dll")]  
        public static extern void  
            SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter,  
                         int X, int Y, int width, int height, uint flags);  
  
        private const int SM_CXSCREEN = 0;  
        private const int SM_CYSCREEN = 1;  
        private static IntPtr HWND_TOP = IntPtr.Zero;  
        private const int SWP_SHOWWINDOW = 64; // 0x0040  
  
        public static int ScreenX  
        {  
            get { return GetSystemMetrics(SM_CXSCREEN); }  
        }  
  
        public static int ScreenY  
        {  
            get { return GetSystemMetrics(SM_CYSCREEN); }  
        }  
  
        public static void SetWinFullScreen(IntPtr hwnd)  
        {  
            SetWindowPos(hwnd, HWND_TOP, 0, 0, ScreenX, ScreenY, SWP_SHOWWINDOW);  
        }  
    }  
    /// <summary>  
    /// Class used to preserve / restore state of the form  
    /// </summary>  
    public class FormState  
    {  
        private FormWindowState winState;  
        private FormBorderStyle brdStyle;  
        private bool topMost;  
        private Rectangle bounds;  
  
        private bool isMaximized = false;  
  
        public bool IsMaximized  
        {  
            get { return isMaximized; }  
        }  
  
        public void Maximize(Form targetForm)  
        {  
            if (!isMaximized)  
            {  
                targetForm.SuspendLayout();  
                isMaximized = true;  
                Save(targetForm);  
                targetForm.WindowState = FormWindowState.Maximized;  
                targetForm.FormBorderStyle = FormBorderStyle.None;  
                targetForm.TopMost = false;  
                WinApi.SetWinFullScreen(targetForm.Handle);  
                targetForm.ResumeLayout(true);  
            }  
        }  
  
        public void Save(Form targetForm)  
        {  
            targetForm.SuspendLayout();  
            winState = targetForm.WindowState;  
            brdStyle = targetForm.FormBorderStyle;  
            topMost = targetForm.TopMost;  
            bounds = targetForm.Bounds;  
            targetForm.ResumeLayout(true);  
        }  
  
        public void Restore(Form targetForm)  
        {  
            targetForm.WindowState = winState;  
            targetForm.FormBorderStyle = brdStyle;  
            targetForm.TopMost = topMost;  
            targetForm.Bounds = bounds;  
            isMaximized = false;  
        }  
    }  
}  

下面是使用的代码：

/// <summary>  
        /// 正常的窗体状态  
        /// </summary>  
        public  FormState FrmState=new FormState();  
//窗体点击esc时切换  
        private void MaxForm_KeyPress(object sender, KeyPressEventArgs e)  
        {  
            if (e.KeyChar == 27)  
                if (FrmState.IsMaximized)  
                    FrmState.Restore(this);  
                else  
                    FrmState.Maximize(this);  
        }  

下面要留意的，就是闪烁问题的，大家留意下：

  private void frm_Main_Shown(object sender, EventArgs e)
        {
            this.Visible = false;
            FrmState.Maximize(this);
            this.Visible = true;
            //加载背景图
            AutoLoadBackImage();
	 }

其实，窗体闪烁严重的在于窗体有很多控件或者是存在背景图。因此，在最大化前必须让窗体处于控件量最小，没有背景图的情况。在最大化后再对控件以及背景图进行加载。