Define Apply Button action method in dialog class : Dialog « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. Dialog

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class DialogApplyMethodInDialogClass : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnCreate;
  private System.Windows.Forms.Label lblReturn;

  public DialogApplyMethodInDialogClass()
  {
    InitializeComponent();
  }
  private void InitializeComponent()
  {
    this.btnCreate = new System.Windows.Forms.Button();
    this.lblReturn = new System.Windows.Forms.Label();
    this.SuspendLayout();
    this.btnCreate.Location = new System.Drawing.Point(80, 144);
    this.btnCreate.Name = "btnCreate";
    this.btnCreate.Size = new System.Drawing.Size(136, 23);
    this.btnCreate.TabIndex = 0;
    this.btnCreate.Text = "Create Dialog Box";
    this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
    this.lblReturn.Location = new System.Drawing.Point(88, 64);
    this.lblReturn.Name = "lblReturn";
    this.lblReturn.Size = new System.Drawing.Size(152, 23);
    this.lblReturn.TabIndex = 1;
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.lblReturn,
                                             this.btnCreate});
    this.ResumeLayout(false);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DialogApplyMethodInDialogClass());
  }

  private void btnCreate_Click(object sender, System.EventArgs e)
  {
    DialogDemo dlg = new DialogDemo(this);
    dlg.EnableApplyButton = false;

    dlg.ShowDialog();
    
    if (dlg.DialogResult == DialogResult.OK)
      {lblReturn.Text = dlg.TextOut;}
    else
      {lblReturn.Text = dlg.DialogResult.ToString();}
  }
  
  public void UpdateLabel(string str)
  {
    lblReturn.Text = str;
  }

}
public class DialogDemo : Form
{
  private Button btnApply = new Button();
  private TextBox txt = new TextBox();
  private DialogApplyMethodInDialogClass f;
  
  public DialogDemo(DialogApplyMethodInDialogClass f)
  {
    this.f = f;
    FormBorderStyle = FormBorderStyle.FixedDialog;
    BackColor = System.Drawing.Color.Aquamarine;
    ControlBox = false;
    MaximizeBox = false;
    MinimizeBox = false;
    ShowInTaskbar = false;
    Size = new Size(400,200);
    StartPosition = FormStartPosition.CenterScreen;

    Button btnOK = new Button();
    btnOK.Text = "OK";
    btnOK.DialogResult = DialogResult.OK;
    btnOK.Location = new Point(50,50);
    btnOK.TabIndex = 0;
    Controls.Add(btnOK);
    
    btnApply.Text = "Apply";
    btnApply.Location = new Point(150,50);
    btnApply.TabIndex = 1;
    btnApply.Enabled = false;
    btnApply.Click += new EventHandler(ApplyOnClick);
    Controls.Add(btnApply);
    
    Button btnCancel = new Button();
    btnCancel.Text = "Cancel";
    btnCancel.DialogResult = DialogResult.Cancel;
    btnCancel.Location = new Point(250,50);
    btnCancel.TabIndex = 2;
    Controls.Add(btnCancel);

    
    txt.Size = new Size(100,15);
    txt.Location = new Point(150,15);
    txt.TextChanged += new EventHandler(TextBoxChanged);
    Controls.Add(txt);
  }

  private void ApplyOnClick(object sender, EventArgs e)
  {
    f.UpdateLabel(txt.Text);
    EnableApplyButton = false;
  }
  
  private void TextBoxChanged(object sender, EventArgs e)
  {
    TextBox txt = (TextBox)sender;
    DialogDemo dlg = (DialogDemo)txt.Parent;
    dlg.EnableApplyButton = true;  
  }

  public bool EnableApplyButton
  {
    get {return btnApply.Enabled; }
    set {btnApply.Enabled = value; }
  }
  
  public string TextOut
  {
    get
      {return txt.Text; }
  }
}

23.52.Dialog
	23.52.1.	Call ShowDialog on Form object
	23.52.2.	About DialogBox
	23.52.3.	Define your own dialog box
	23.52.4.	Dialog Apply Event Illustration
	23.52.5.	Define Apply Button action method in dialog class
	23.52.6.	Set DialogResult in your own dialog class
	23.52.7.	Create a custom dialog with radio button group
	23.52.8.	Dialog with two buttons