[C#] Validation class for events?

[gicio]

Hi,

 

I develop an application that have 20 windows forms with many TextBoxes.

All TextBoxes have the same validation...

I write in all classes the same validation like that:

 

 

 

		
	//if the user press a key down at txtDisplacement we check which one was pressed down
	#region KeyDownInTxtDisplacement code
	private void KeyDownInTxtDisplacement(object sender, System.Windows.Forms.KeyEventArgs e)
	{
		CheckWhichKeyDown(e);
	}
	#endregion



	//if the user press a key down at txtModel we check which one was pressed down
	#region KeyDownInTxtModel code
	private void KeyDownInTxtModel(object sender, System.Windows.Forms.KeyEventArgs e)
	{
		CheckWhichKeyDown(e);
	}
	#endregion



	//we check which key is pressed
	//if key Enter or Return or Tab is pressed
	//we go throw DoWhenOneTextBoxIsMarkedRed()
	#region CheckWhichKeyDown code
	private void CheckWhichKeyDown(System.Windows.Forms.KeyEventArgs e)
	{
		if(e.KeyCode==Keys.Enter || e.KeyCode==Keys.Return || e.KeyCode==Keys.Tab)
		{
			ValidateThis();
		}		
	}
	#endregion



	//when special key is press we enable the button
	#region ValidateThis code
	private void ValidateThis()
	{
		cmdAddToDataBase.Enabled = true;
	}
	#endregion

 

 

 

 

CheckWhichKeyDown and ValidateThis should be in one validation class.

How I can write a validation class that validate ALL TextBoxes from all classes.

Any ideas?

Or do you know some sample validation classes available on www?

 

 

gicio

[divil]

Could you not make your own textbox class with this behaviour built in by inheriting from textbox?

[gicio]

Hi,

 

I write a new class... like this:

 

 

 

using System;
using System.Windows.Forms;
using System.Windows.Forms.ComponentModel;

namespace CarTrade
{
/// <summary>
/// Summary description for TestTextBox.
/// </summary>
public class TestTextBox : System.Windows.Forms.TextBox
{
	private bool booOnlyNumericCharsAllowed;
	private bool booSpecialKeyIsPress;
	
	public TestTextBox.
	{

	}

	//---------------------------------------------------------------
	//---------------------------PROPERTIES--------------------------
	//---------------------------------------------------------------

	//we allowed in the TestTextBox only numeric chars
	//when the user set the proparty OnlyOnlyNumericCharsAllowed
	//to true
	internal bool OnlyNumericCharsAllowed
	{
		get
		{
			//return the value how OnlyOnlyNumericCharsAllowed
			//is set
			return booOnlyNumericCharsAllowed;
		}
		set
		{
			if(value)
			{
				this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.DoWhenKeyPress);
			}

			booOnlyNumericCharsAllowed = value;
		}
	}

	internal bool SpecialKeyIsPress
	{
		get
		{
			return booSpecialKeyIsPress;
		}
		set
		{
			if(value)
			{
				this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.CheckIfSpecialKeysArePressed);
			}

			booSpecialKeyIsPress = value;
		}
	}

	private void CheckIfSpecialKeysArePressed(object sender, System.Windows.Forms.KeyEventArgs e)
	{
		bool booEnter = e.KeyCode == Keys.Enter;
		bool booReturn = e.KeyCode==Keys.Return;
		bool booTab = e.KeyCode==Keys.Tab;

		if(booEnter || booReturn || booTab)
		{
	
		}
	}

	private void DoWhenKeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
	{
		if((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 )
		{
			e.Handled = true;
		}

		if(Text.Length == 0 && e.KeyChar == 48)
		{
			e.Handled = true;
		}
	}

}
}

 

 

 

Any coments are welcome!

 

 

gicio