EventHandler









How do I use Event Handler
Below are practical examples compiled from projects for learning and reference purposes

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File name: Form1.cs Copy
32   {
33    get
34    {
35     if (defaultInstance == null)
36     {
37      defaultInstance = new Form1();
38      defaultInstance.FormClosed += new FormClosedEventHandler(defaultInstance_FormClosed);
39     }
40
41     return defaultInstance;
42    }
43   }
File name: frmMain.cs Copy
59   private void InitializeComponent()
60   {
61             this.components = new System.ComponentModel.Container();
62             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(frmMain));
63             this.mainMenu1 = new System.Windows.Forms.MainMenu(this.components);
64             this.menuItem1 = new System.Windows.Forms.MenuItem();
65             this.FileLoad = new System.Windows.Forms.MenuItem();
66             this.FileSave = new System.Windows.Forms.MenuItem();
67             this.FileExit = new System.Windows.Forms.MenuItem();
68             this.menuItem4 = new System.Windows.Forms.MenuItem();
69             this.FilterGrayScale = new System.Windows.Forms.MenuItem();
70             this.FilterColor = new System.Windows.Forms.MenuItem();
71             this.menuItem3 = new System.Windows.Forms.MenuItem();
72             this.EmbossLaplacian = new System.Windows.Forms.MenuItem();
73             this.EdgeDetectQuick = new System.Windows.Forms.MenuItem();
74             this.SuspendLayout();
75             //
76             // mainMenu1
77             //
78             this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
79             this.menuItem1,
80             this.menuItem4,
81             this.menuItem3});
82             //
83             // menuItem1
84             //
85             this.menuItem1.Index = 0;
86             this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
87             this.FileLoad,
88             this.FileSave,
89             this.FileExit});
90             this.menuItem1.Text = "File";
91             //this.menuItem1.Click += new System.EventHandler(this.menuItem1_Click);
92             //
93             // FileLoad
94             //
95             this.FileLoad.Index = 0;
96             this.FileLoad.Shortcut = System.Windows.Forms.Shortcut.CtrlO;
97             this.FileLoad.Text = "Mở file";
98             this.FileLoad.Click += new System.EventHandler(this.File_Load);
99             //
100             // FileSave
101             //
102             this.FileSave.Index = 1;
103             this.FileSave.Shortcut = System.Windows.Forms.Shortcut.CtrlS;
104             this.FileSave.Text = "Lưu file";
105             this.FileSave.Click += new System.EventHandler(this.File_Save);
106             //
107             // FileExit
108             //
109             this.FileExit.Index = 2;
110             this.FileExit.Text = "Thoát";
111             this.FileExit.Click += new System.EventHandler(this.File_Exit);
112             //
113             // menuItem4
114             //
115             this.menuItem4.Index = 1;
116             this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
117             this.FilterGrayScale,
118             this.FilterColor});
119             this.menuItem4.Text = "Biến đổi màu";
120             //
121             // FilterGrayScale
122             //
123             this.FilterGrayScale.Index = 0;
124             this.FilterGrayScale.Text = "Xám";
125             this.FilterGrayScale.Click += new System.EventHandler(this.Filter_GrayScale);
126             //
127             // FilterColor
128             //
129             this.FilterColor.Index = 1;
130             this.FilterColor.Text = "Màu";
131             this.FilterColor.Click += new System.EventHandler(this.Filter_Color);
132             //
133             // menuItem3
134             //
135             this.menuItem3.Index = 2;
136             this.menuItem3.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
137             this.EmbossLaplacian,
138             this.EdgeDetectQuick});
139             this.menuItem3.Text = "Phát hiện biên";
140             //this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);
141             //
142             // EmbossLaplacian
143             //
144             this.EmbossLaplacian.Index = 0;
145             this.EmbossLaplacian.Text = "Laplacian_Emboss";
146             this.EmbossLaplacian.Click += new System.EventHandler(this.OnEmbossLaplacian);
147             //
148             // EdgeDetectQuick
149             //
150             this.EdgeDetectQuick.Index = 1;
151             this.EdgeDetectQuick.Text = "EdgeDetectQuick";
152             this.EdgeDetectQuick.Click += new System.EventHandler(this.OnEdgeDetectQuick);
153             //
154             // frmMain
155             //
156             this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
157             this.BackColor = System.Drawing.SystemColors.ControlLightLight;
158             this.BackgroundImage = global::CSharpFilters.Properties.Resources.Daewoo;
159             this.ClientSize = new System.Drawing.Size(349, 237);
160             this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
161             this.Menu = this.mainMenu1;
162             this.Name = "frmMain";
163             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
164             this.Text = "Xu ly anh";
165             //this.Load += new System.EventHandler(this.Form1_Load);
166             this.ResumeLayout(false);
167
168   }
File name: notepad1.cs Copy
487         private void fontKlyeMethod()
488         {
489             // FontDialog fontdialog = new FontDialog() {
490             fontdialog.ShowColor = true;
491             fontdialog.ShowApply = true;
492
493             fontdialog.Apply += new System.EventHandler(fontdialog_apply);
494
495             // };
496             // fontdialog.ShowColor = true;
497
498             DialogResult result = fontdialog.ShowDialog(); //ye dialogresult khudsy agr na likha jay to uper sy copy krlyn
499
500             if (result == DialogResult.OK)
501             {
502                 if (mainrichTextBox.SelectionLength > 0)
503                 {
504                     mainrichTextBox.SelectionFont = fontdialog.Font;
505                     mainrichTextBox.SelectionColor = fontdialog.Color;
506                 }
507                 else
508                 {
509                     //MessageBox.Show("please select first");
510                 }
511             }
512             else
513             {
514
515
516             }
517
518         }
File name: frmEnrollment.cs Copy
125   void FrmEnrollmentLoad(object sender, EventArgs e)
126   {
127    grabber = new Capture();
128             grabber.QueryFrame();
129             Application.Idle += new EventHandler(FrameGrabber);
130   }
File name: MainForm.cs Copy
163         private void FrmPrincipal_Load(object sender, EventArgs e)
164         {
165             grabber = new Capture();
166             grabber.QueryFrame();
167             Application.Idle += new EventHandler(FrameGrabber);
168         }

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