KeyPressEventArgs.Handled : KeyPressEventArgs « System.Windows.Forms

  

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;



public class TextCancelEventKeyEvent : System.Windows.Forms.Form

{

  private System.Windows.Forms.Label label1;

  private System.Windows.Forms.TextBox txtInput;

  private System.Windows.Forms.Label label2;

  private System.Windows.Forms.Label lblTrue;

  private System.Windows.Forms.Label label3;

  private System.Windows.Forms.Label lblCheck;

    private System.Windows.Forms.Label lblResults;



  public TextCancelEventKeyEvent()

  {

    InitializeComponent();

  }



  private void InitializeComponent()

  {

     this.label1 = new System.Windows.Forms.Label();

     this.txtInput = new System.Windows.Forms.TextBox();

     this.label2 = new System.Windows.Forms.Label();

     this.lblTrue = new System.Windows.Forms.Label();

     this.label3 = new System.Windows.Forms.Label();

     this.lblCheck = new System.Windows.Forms.Label();

     this.lblResults = new System.Windows.Forms.Label();

     this.SuspendLayout();

     // 

     // label1

     // 

     this.label1.Font = new System.Drawing.Font("Tahoma", 14.25F, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic), System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));

     this.label1.Location = new System.Drawing.Point(48, 16);

     this.label1.Name = "label1";

     this.label1.Size = new System.Drawing.Size(176, 23);

     this.label1.TabIndex = 0;

     this.label1.Text = "ISBN Validation";

     // 

     // txtInput

     // 

     this.txtInput.Location = new System.Drawing.Point(72, 64);

     this.txtInput.Name = "txtInput";

     this.txtInput.TabIndex = 1;

     this.txtInput.Text = "";

     this.txtInput.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtInput_KeyPress);

     this.txtInput.Validating += new System.ComponentModel.CancelEventHandler(this.handleCancleEvent);

     // 

     // label2

     // 

     this.label2.Location = new System.Drawing.Point(24, 104);

     this.label2.Name = "label2";

     this.label2.Size = new System.Drawing.Size(80, 23);

     this.label2.TabIndex = 2;

     this.label2.Text = "True Number:";

     // 

     // lblTrue

     // 

     this.lblTrue.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;

     this.lblTrue.Location = new System.Drawing.Point(112, 104);

     this.lblTrue.Name = "lblTrue";

     this.lblTrue.TabIndex = 3;

     // 

     // label3

     // 

     this.label3.Location = new System.Drawing.Point(32, 152);

     this.label3.Name = "label3";

     this.label3.Size = new System.Drawing.Size(72, 23);

     this.label3.TabIndex = 4;

     this.label3.Text = "Check Digit:";

     // 

     // lblCheck

     // 

     this.lblCheck.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;

     this.lblCheck.Location = new System.Drawing.Point(112, 152);

     this.lblCheck.Name = "lblCheck";

     this.lblCheck.TabIndex = 5;

     // 

     // lblResults

     // 

     this.lblResults.Location = new System.Drawing.Point(56, 192);

     this.lblResults.Name = "lblResults";

     this.lblResults.Size = new System.Drawing.Size(152, 24);

     this.lblResults.TabIndex = 8;

     // 

     // TextCancelEventKeyEvent

     // 

     this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

     this.ClientSize = new System.Drawing.Size(264, 293);

     this.Controls.AddRange(new System.Windows.Forms.Control[] {

                                                                  this.lblResults,

                                                                  this.lblCheck,

                                                                  this.label3,

                                                                  this.lblTrue,

                                                                  this.label2,

                                                                  this.txtInput,

                                                                  this.label1});

     this.ResumeLayout(false);



  }

  [STAThread]

  static void Main() 

  {

    Application.Run(new TextCancelEventKeyEvent());

  }



  private void handleCancleEvent(object sender, System.ComponentModel.CancelEventArgs e)

  {

    TextBox tb = (TextBox)sender;

    string strInput = tb.Text;

        Console.WriteLine(strInput);

  }     



  private void txtInput_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)

  {

     char keyChar;

     keyChar = e.KeyChar;



     if(!Char.IsDigit(keyChar)      // 0 - 9

        &&

        keyChar != 8               // backspace

        &&

        keyChar != 13              // enter

        &&

        keyChar != 'x'

        &&

        keyChar != 45              //  dash/minus

        ){

        //  Do not display the keystroke

        e.Handled = true;

     }

  }     

}
KeyPressEventArgs.Handled : KeyPressEventArgs « System.Windows.Forms « C# / C Sharp by API
