C# (CSharp) 单例模式_菜单事件判断防多开 frmToolBox.Show Examples

Example #1

 private void toolStripButton1_Click(object sender, EventArgs e)
 {
     if (ftb == null || ftb.IsDisposed)             //if (ftb == null)//关掉工具栏后无法重开
     {
         ftb          = new frmToolBox();
         ftb.TopLevel = false;                 //不加就变成顶级，无法添加
         ftb.Parent   = this;
         ftb.Show();
     }             //与菜单项事件完全一样的代码
 }

Example #2

File: Form1.cs Project: ningboliuwei/Course_DesignPatterns

 private void toolStripButton1_Click(object sender, EventArgs e)
 {
     if (ftb == null || ftb.IsDisposed) //if (ftb == null)//关掉工具栏后无法重开
     {
         ftb = new frmToolBox();
         ftb.TopLevel = false; //不加就变成顶级，无法添加
         ftb.Parent = this;
         ftb.Show();
     } //与菜单项事件完全一样的代码
 }

Example #3

 private void 工具栏ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (ftb == null || ftb.IsDisposed)             //关掉工具栏后可以重开
     //if (ftb == null)//关掉工具栏后无法重开
     {
         ftb          = new frmToolBox();
         ftb.TopLevel = false;                 //不加就变成顶级，无法添加
         ftb.Parent   = this;
         ftb.Show();
     }
 }

Example #4

File: Form1.cs Project: ningboliuwei/Course_DesignPatterns

 private void 工具栏ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (ftb == null || ftb.IsDisposed) //关掉工具栏后可以重开
         //if (ftb == null)//关掉工具栏后无法重开
     {
         ftb = new frmToolBox();
         ftb.TopLevel = false; //不加就变成顶级，无法添加
         ftb.Parent = this;
         ftb.Show();
     }
 }