Develop Reference

How to detect and record the time when the button is pressed in C#?

For instance, if there is a push button, when the user press the button, the system should detect and record the time in dd-mm-yy. However, if the user press the button many time in 2 second, the system should only record the first time when the user press the button.

Assumption: you want to collect clicks but no more often than every 2 seconds. This simple form will do it.
Code:
namespace RecordClicks {
public partial class Form1 : Form {
private DateTime _recordedClick = DateTime.MinValue;
public Form1() {
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e) {
DateTime currentClickTime = DateTime.Now;
if (currentClickTime.Subtract(_recordedClick).TotalMilliseconds > 2000 ) {
_recordedClick = currentClickTime;
lblClick.Text = currentClickTime.ToString();
// TODO: add code to record this click
}
}
}
}
Designer:
namespace RecordClicks {
partial class Form1 {
/// <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() {
this.button1 = new System.Windows.Forms.Button();
this.lblClick = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(121, 241);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(132, 53);
this.button1.TabIndex = 0;
this.button1.Text = "Clicker";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// lblClick
//
this.lblClick.AutoSize = true;
this.lblClick.Font = new System.Drawing.Font("Segoe UI", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
this.lblClick.Location = new System.Drawing.Point(121, 127);
this.lblClick.Name = "lblClick";
this.lblClick.Size = new System.Drawing.Size(90, 45);
this.lblClick.TabIndex = 1;
this.lblClick.Text = "Time";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(800, 450);
this.Controls.Add(this.lblClick);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Clicker Test";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private Button button1;
private Label lblClick;
}
}

No overload for 'MainFormLoad' matches delegate 'System.EventHandler' (CS0123)

I've just started to learn programming in C# and I have a problem. I made a simple application (just a window with two buttons). One button starts another program and the other button shows this window again in 2 minutes (it's a sort of reminder). There's no X button, but it can still be closed by ALTF4 which I want to disable.
I've tried e.Cancel = true;, but I am obviously doing something wrong. What I did was doubleclick on the main window, then void MainFormLoad(object sender, EventArgs e) appeared in the code and I changed EventArgs e to FormClosingEventArgs and pasted the above e.Cancel = true; in there.
I am getting the following error:
No overload for 'MainFormLoad' matches delegate 'System.EventHandler' (CS0123)
It refers me to this line in MainForm.Designer.cs:
this.Load += new System.EventHandler(this.MainFormLoad);
Here's the whole code:
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
namespace Reminder
{
/// <summary>
/// Description of MainForm.
/// </summary>
public partial class MainForm : Form
{
public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();
//
// TODO: Add constructor code after the InitializeComponent() call.
//
}
int duration = 0;
void Timer1Tick(object sender, EventArgs e)
{
duration++;
System.Diagnostics.ProcessStartInfo start = new System.Diagnostics.ProcessStartInfo();
start.FileName = #"C:\ThisProgram.exe";
Process.Start(start);
Application.Exit();
if (duration == 1)
{
Timer.Stop();
}
}
void LaterClick(object sender, EventArgs e)
{
Timer.Enabled = true;
Timer.Start();
Hide();
}
void OKClick(object sender, EventArgs e)
{
System.Diagnostics.ProcessStartInfo start = new System.Diagnostics.ProcessStartInfo();
start.FileName = #"C:\OtherExternalProgram.exe";
Process.Start(start);
Application.Exit();
}
void MainFormLoad(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
}
}
}
And here is the MainForm.Designer.cs code:
namespace Reminder
{
partial class MainForm
{
/// <summary>
/// Designer variable used to keep track of non-visual components.
/// </summary>
private System.ComponentModel.IContainer components = null;
private System.Windows.Forms.Button OK;
private System.Windows.Forms.Timer Timer;
private System.Windows.Forms.Button Later;
/// <summary>
/// Disposes resources used by the form.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing) {
if (components != null) {
components.Dispose();
}
}
base.Dispose(disposing);
}
/// <summary>
/// This method is required for Windows Forms designer support.
/// Do not change the method contents inside the source code editor. The Forms designer might
/// not be able to load this method if it was changed manually.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
this.OK = new System.Windows.Forms.Button();
this.Timer = new System.Windows.Forms.Timer(this.components);
this.Later = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// OK
//
this.OK.Location = new System.Drawing.Point(12, 253);
this.OK.Name = "OK";
this.OK.Size = new System.Drawing.Size(75, 23);
this.OK.TabIndex = 0;
this.OK.Text = "OK";
this.OK.UseVisualStyleBackColor = true;
this.OK.Click += new System.EventHandler(this.OKClick);
//
// Timer
//
this.Timer.Interval = 24000;
this.Timer.Tick += new System.EventHandler(this.Timer1Tick);
//
// Later
//
this.Later.Location = new System.Drawing.Point(425, 253);
this.Later.Name = "Later";
this.Later.Size = new System.Drawing.Size(75, 23);
this.Later.TabIndex = 1;
this.Later.Text = "Later";
this.Later.UseVisualStyleBackColor = true;
this.Later.Click += new System.EventHandler(this.LaterClick);
//
// MainForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackColor = System.Drawing.SystemColors.Window;
this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Zoom;
this.ClientSize = new System.Drawing.Size(512, 288);
this.Controls.Add(this.Later);
this.Controls.Add(this.OK);
this.Cursor = System.Windows.Forms.Cursors.Default;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "MainForm";
this.ShowIcon = false;
this.ShowInTaskbar = false;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.TopMost = true;
this.Load += new System.EventHandler(this.MainFormLoad);
this.ResumeLayout(false);
}
}
}
Thank you in advance for your help.

C# MS Equation Editor richtextbox issue

I have an issue with C# richtextbox and Microsoft equation editor. My goal is to read, modify and save changes in rtf file.
I followed tutorial below:
C# Tutorial : How to insert Math Equation to RichTextBox | FoxLearn
I can read and modify equation in editor, however I can't update richtextbox after modification, modified value is not changed in richtboxtext.
Initial state
Modification
Update(F3) and exit in equation editor doesn't cause change in richtextbox.
However when I double click equation in editor there is changed value.
Here is my code:
using System;
using System.Windows.Forms;
namespace Panel.Views
{
public partial class Axis : Form
{
public Axis()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
richTextBox1.SelectedRtf = Panel.Properties.Resources.Plot1_x_axis;
}
}
}
namespace Panel.Views
{
partial class Axis
{
/// <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()
{
this.button1 = new System.Windows.Forms.Button();
this.richTextBox1 = new System.Windows.Forms.RichTextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(723, 431);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// richTextBox1
//
this.richTextBox1.Location = new System.Drawing.Point(28, 36);
this.richTextBox1.Name = "richTextBox1";
this.richTextBox1.Size = new System.Drawing.Size(770, 372);
this.richTextBox1.TabIndex = 1;
this.richTextBox1.Text = "";
//
// Axis
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(822, 478);
this.Controls.Add(this.richTextBox1);
this.Controls.Add(this.button1);
this.Name = "Axis";
this.Text = "Axis";
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.RichTextBox richTextBox1;
}
}
I would be appreciated for any help, hints or suggestions how to solve this issue.
Thank you in advance.

Can't resize controls with mouse in Visual Studio 2008 (C#, .NET Compact)

I am developing a windows forms application for Windows Mobile 6 in Visual Studio 2008. There is a requirement to have some common controls on each form, such as Logo (PictureBox), Title (Label) and a small description (also Label). I decided to make a FormBase with those controls and inherit other forms from that base.
The problem is that for some reason, when I drop a Button or another control on that inherited form, I cannot resize it with my mouse. I can press Shift+Arrow to resize anything with my keyboard shortcuts, but the mouse does not work.
It's not very convenient neither for me nor for other developers in my team.
Any suggestions?
Update 1
the base form:
public class FormBase : Form
{
public FormBase()
{
InitializeComponent();
}
/// <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(FormBase));
this.pictureLogo = new System.Windows.Forms.PictureBox();
this.labelTitle = new System.Windows.Forms.Label();
this.panelSeparator = new System.Windows.Forms.Panel();
this.SuspendLayout();
//
// pictureLogo
//
this.pictureLogo.Image = ((System.Drawing.Image)(resources.GetObject("pictureLogo.Image")));
this.pictureLogo.Location = new System.Drawing.Point(0, 0);
this.pictureLogo.Name = "pictureLogo";
this.pictureLogo.Size = new System.Drawing.Size(48, 48);
//
// labelTitle
//
this.labelTitle.Font = new System.Drawing.Font("Tahoma", 10F, System.Drawing.FontStyle.Bold);
this.labelTitle.ForeColor = System.Drawing.Color.Black;
this.labelTitle.Location = new System.Drawing.Point(54, 2);
this.labelTitle.Name = "labelTitle";
this.labelTitle.Size = new System.Drawing.Size(183, 16);
this.labelTitle.Text = "Title";
//
// panelSeparator
//
this.panelSeparator.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.panelSeparator.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(35)))), ((int)(((byte)(44)))), ((int)(((byte)(75)))));
this.panelSeparator.Location = new System.Drawing.Point(3, 50);
this.panelSeparator.Name = "panelSeparator";
this.panelSeparator.Size = new System.Drawing.Size(234, 1);
//
// FormBase
//
this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
this.AutoScroll = true;
this.BackColor = System.Drawing.Color.White;
this.ClientSize = new System.Drawing.Size(240, 320);
this.ControlBox = false;
this.Controls.Add(this.panelSeparator);
this.Controls.Add(this.labelTitle);
this.Controls.Add(this.pictureLogo);
this.ForeColor = System.Drawing.Color.Black;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.KeyPreview = true;
this.Location = new System.Drawing.Point(0, 0);
this.MinimizeBox = false;
this.Name = "FormBase";
this.Text = "FormBase";
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.PictureBox pictureLogo;
private System.Windows.Forms.Label labelTitle;
private System.Windows.Forms.Panel panelSeparator;
}
the inherited form:
public class FrontDoorForm : FormBase
{
public FrontDoorForm()
{
InitializeComponent();
}
private void buttonQuit_Click(object sender, EventArgs e)
{
Close();
}
/// <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()
{
this.buttonQuit = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// buttonQuit
//
this.buttonQuit.Location = new System.Drawing.Point(3, 54);
this.buttonQuit.Name = "buttonQuit";
this.buttonQuit.Size = new System.Drawing.Size(115, 46);
this.buttonQuit.TabIndex = 2;
this.buttonQuit.Text = "Quit";
this.buttonQuit.Click += new System.EventHandler(this.buttonQuit_Click);
//
// FrontDoorForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
this.BackColor = System.Drawing.Color.White;
this.ClientSize = new System.Drawing.Size(240, 320);
this.Controls.Add(this.buttonQuit);
this.Font = new System.Drawing.Font("Tahoma", 10F, System.Drawing.FontStyle.Regular);
this.ForeColor = System.Drawing.Color.Black;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Location = new System.Drawing.Point(0, 0);
this.MinimizeBox = true;
this.Name = "FrontDoorForm";
this.Text = "FrontDoorForm";
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
this.Controls.SetChildIndex(this.buttonQuit, 0);
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Button buttonQuit;
}

Just to close the question I will quote the answer from the comment:
Change the base form's WindowState back to Normal for a workaround. You can still get it Maximized in the derived form. Hans Passant

Inheriting Windows Form Classes with Visual Studio 2010

I'm using Visual Studio 2010 to create an application. I have a class derived from the System.Windows.Forms.Form control. This class, called CViewport, is a standard for all forms in my application( ie. I intend to derive other forms from this class).
After deriving a class from CViewport, I go to the designer to edit the 2nd generation form and in the designer the form is not displayed correctly. It appears transparent if I'm not mistaken...the previous window shines through the client area of the form as if the backbuffer has not been drawn to by the designer...
...Also, after changing the size of the 2nd gen form, the designer resets the size to arbitrary dimensions...
Why might this be happening? Here is Form derived class:
namespace MyApp
{
public partial class CViewport : Form
{
public CViewport()
{
InitializeComponent();
}
}
}
here is CViewport.Designer.cs:
namespace MyApp
{
partial class CViewport
{
/// <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(GDEViewport));
this.SuspendLayout();
//
// CViewport
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(800, 600);
this.ControlBox = false;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "GDEViewport";
this.ShowIcon = false;
this.ShowInTaskbar = false;
this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
this.Activated += new System.EventHandler(this.ViewportForm_Activated);
this.Deactivate += new System.EventHandler(this.ViewportForm_Deactivate);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.OnFormClosing);
this.ResizeBegin += new System.EventHandler(this.ViewportForm_ResizeBegin);
this.ResizeEnd += new System.EventHandler(this.ViewportForm_ResizeEnd);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.ViewportForm_Paint);
this.Resize += new System.EventHandler(this.MainViewport_UserResized);
this.ResumeLayout(false);
}
#endregion
}
}
here is 2nd gen form derived from CViewport
namespace MyApp
{
public partial class CMainViewport: CViewport
{
public CMainViewport()
{
InitializeComponent();
}
}
}
here is CMainViewport.Designer.cs:
namespace MyApp
{
partial class CMainViewport
{
/// <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()
{
this.SuspendLayout();
//
// CMainViewport
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(1218, 573);
this.ControlBox = true;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
this.MaximizeBox = true;
this.MinimizeBox = true;
this.MinimumSize = new System.Drawing.Size(800, 600);
this.Name = "TestForm";
this.RightToLeft = System.Windows.Forms.RightToLeft.No;
this.ShowIcon = true;
this.ShowInTaskbar = true;
this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Auto;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "TestForm";
this.PauseRendering += new System.EventHandler<System.EventArgs>(this.ViewportForm_PauseRendering);
this.ResumeRendering += new System.EventHandler<System.EventArgs>(this.ViewportForm_ResumeRendering);
this.SystemResume += new System.EventHandler<System.EventArgs>(this.MainViewport_SystemResume);
this.SystemSuspend += new System.EventHandler<System.EventArgs>(this.MainViewport_SystemSuspend);
this.UserResized += new System.EventHandler<System.EventArgs>(this.MainViewport_UserResized);
this.Activated += new System.EventHandler(this.ViewportForm_Activated);
this.Deactivate += new System.EventHandler(this.ViewportForm_Deactivate);
this.ResizeBegin += new System.EventHandler(this.ViewportForm_ResizeBegin);
this.ResizeEnd += new System.EventHandler(this.ViewportForm_ResizeEnd);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.ViewportForm_Paint);
this.Resize += new System.EventHandler(this.ViewportForm_Resize);
this.ResumeLayout(false);
}
#endregion
}
}

this.ResizeBegin += new System.EventHandler(this.ViewportForm_ResizeBegin);
this.ResizeEnd += new System.EventHandler(this.ViewportForm_ResizeEnd);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.ViewportForm_Paint);
this.Resize += new System.EventHandler(this.MainViewport_UserResized);
The designer runs the code in the base class to provide the WYSIWYG view. That's normally the Form class, it doesn't have any bugs. Now it is your CViewPort class. It has bugs. In one those event handlers that we cannot see.
Like the Paint event handler, strong lead to "is not displayed correctly". You have a handler for Resize, strong lead to "resets the size to arbitrary dimensions". Having these events also run at design time is what is getting you into trouble. And you are doing it wrong, a base class for a Form should override OnPaint() and OnResize() so the order in which code runs is predictable and controllable.
Having code run at design-time requires deeper insight in the way Winforms works, getting guidance from a book is rather important. You are not there yet, you didn't realize that posting the code for these event handlers was even relevant. There's a keep-out-of-trouble approach that gives you time to read the book, add this line of code to every event handler you added to your CViewPort class:
if (this.DesignMode) return;

The answer posted by Hans Passant was very helpful...the problem though, was that I was setting the DockStyle property of the base class to 'Fill' in the base form's constructor. Removing this line of code fixed the problem...