C# WinForm MDI闪屏问题解决方案

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using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Windows.Forms;   namespace MDIFlash {     public partial class FormMain : Form     {         Dictionary<int, Form> dicForm = new Dictionary<int, Form>();         int FormCount = 0;           public FormMain()         {             InitializeComponent();               this.IsMdiContainer = true;         }           // 解决MDI闪屏           // 方案1         //protected override CreateParams CreateParams         //{         //    get         //    {         //        CreateParams cp = base.CreateParams;         //        cp.ExStyle |= 0x02000000;         //        return cp;         //    }         //}         // =======           // 方案2         [System.Security.SuppressUnmanagedCodeSecurity]         [DllImport("user32.dll", CharSet = CharSet.Auto)]         public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);         public const int WM_MDINEXT = 0x224;           public new void ActivateMdiChild(Form childToActivate)         {             if (this.ActiveMdiChild != childToActivate)             {                 MdiClient mdiClient = GetCurrentMdiControl();                 if (mdiClient == null)                 {                     return;                 }                 int count = this.MdiChildren.Length;                 Control form;  // next or previous MDIChild form                 int pos = mdiClient.Controls.IndexOf(childToActivate);                 if (pos < 0)                     throw new InvalidOperationException("MDIChild form not found");                 if (pos == 0 && count > 1)                     form = mdiClient.Controls[1];  // get next and activate previous                 else                     form = mdiClient.Controls[pos - 1];  // get previous and activate next                     // flag indicating whether to activate previous or next MDIChild                 IntPtr direction = new IntPtr(pos == 0 ? 1 : 0);                   // bada bing, bada boom                 SendMessage(mdiClient.Handle, WM_MDINEXT, form.Handle, direction);             }         }           public MdiClient GetCurrentMdiControl()         {             foreach (var c in this.Controls)             {                 if (c is MdiClient)                 {                     return c as MdiClient;                 }             }             return null;         }         // =======           private void button1_Click(object sender, EventArgs e)         {             Form1 frmTemp = new Form1();             frmTemp.MdiParent = this;             frmTemp.Text = "窗体0" + (FormCount++).ToString();             frmTemp.Dock = DockStyle.Fill;             frmTemp.SetLabel(frmTemp.Text);             dicForm.Add(FormCount, frmTemp);             frmTemp.Show();         }            int showIndex = 1;           private void button2_Click(object sender, EventArgs e)         {             if (showIndex > dicForm.Count) return;               // 方案1使用             //dicForm[showIndex].Show();             //dicForm[showIndex].BringToFront(); showIndex++;               // 方案2使用             ActivateMdiChild(dicForm[showIndex++]);         }     } }

　

文件名：MDIFlash.rar