[C#] Validation class for events? - C# Discussion Boards

30-Dec-02 1:22

James T. Johnson wrote:
Use the static MousePosition property on the Control class. This property calls ::GetCursorPos and returns the result, so the behavior behind it is the same.

Thanks James, that worked perfectly. Smile | :)

Nick Parker

You see the Standards change. - Fellow co-worker

Re: Click event problem

Nick Parker30-Dec-02 1:29

opening a default file browser of sorts

30-Dec-02 1:29

Nick Parker

You see the Standards change. - Fellow co-worker

jtmtv1829-Dec-02 12:51

jtmtv18

29-Dec-02 12:51

i have a question that i think i need help with. i want to
find a way too open a folder from with in my program by clicking a button and it opening in the default maner (i.e going my computer c:\ ,ect..)
could the following code do it ? (i cant try it yet im not at home.)

//variable called at beging of program
string CurrentDirectory
CurrentDirectory =Environment.CurrentDirectory.ToString();

private void OpenDirect(object sender, System.EventArgs e)
{
System.Diagnostics.Process.Start(CurrentDirectory\FolderIwantToOpen)
}

i havent tryed that yet but not sure if it will work if it wont can someone help me with this subject ?

Thank you,
Jesse M

Re: opening a default file browser of sorts

jtmtv1829-Dec-02 13:05

jtmtv18

29-Dec-02 13:05

oops typo....heres the correction.

string CurrentDirectory
CurrentDirectory =Environment.CurrentDirectory.ToString();

private void OpenDirect(object sender, System.EventArgs e)
{
System.Diagnostics.Process.Start(CurrentDirectory+@"\FolderIwantToOpen")
}

Re: opening a default file browser of sorts

Nick Parker29-Dec-02 14:33

Have someone www.learnvisualstudio.net videos?

29-Dec-02 14:33

jtmtv18 wrote:
i havent tryed that yet but not sure if it will work if it wont can someone help me with this subject ?

This seems to work for me:

private void button1_Click(object sender, System.EventArgs e)
{
	string s;
	s = Environment.CurrentDirectory.ToString();
	System.Diagnostics.Process.Start(s);

}

You will need to identify the folder you want as a string field however, which you didn't do above.

Nick Parker

You see the Standards change. - Fellow co-worker

gicio29-Dec-02 11:33

[C#] Validation class for events?

29-Dec-02 11:33

Have someone any www.learnvisualstudio.net videos?
If you want we can exchange some videos.

gicio

gicio29-Dec-02 11:32

29-Dec-02 11:32

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:

[CODE]
//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
[/CODE]

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

Nick Parker29-Dec-02 14:24

29-Dec-02 14:24

gicio wrote:
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?

Sure, I would highly suggest this so you aren't rewriting code all the time, simply add a new class within your application, possibly like the following:

namespace test
{
  /// <summary>
  /// Summary description for Validation.
  /// </summary>
  public class Validation
  {
	public Validation()
	{}
		
	public bool CheckWhichKeyDown(System.Windows.Forms.KeyEventArgs kea)
	{	
		if(kea.KeyValue == 13)	
			return true;
		else
			return false;
	}

	public bool SomeOtherFunctionHere()
	{
		return true;
	}
  }
}

Then, say for example in any of your KeyDown event handlers you can implement it like the following, keep in mind my namespace for this example is titled test.

private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
	test.Validation v = new Validation();
	if(v.CheckWhichKeyDown(e) == true)
		MessageBox.Show("You hit enter.");
	else
		MessageBox.Show("You hit " + e.KeyData.ToString());
}

The idea is that you are creating an instance of a class, your validation class, and then invoking methods against that instance. Hope this helps.

Nick Parker

You see the Standards change. - Fellow co-worker

gicio30-Dec-02 6:18

30-Dec-02 6:18

thanks for this great solution!!!

gicio

Nick Parker30-Dec-02 6:18

30-Dec-02 6:18

no problem, hope it helps. Smile | :)

Nick Parker

You see the Standards change. - Fellow co-worker

gicio30-Dec-02 7:31

30-Dec-02 7:31

Yes, it did.

gicio Laugh | :laugh:

gicio2-Jan-03 7:40

Looking for other developer boards

2-Jan-03 7:40

Hi,

I write a new class... like this:

[CODE]

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

namespace CarTrade
{
///

/// Summary description for TestTextBox.
///

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;
}
}

}
}

[/CODE]

Any coments are welcome!

gicio

gicio29-Dec-02 11:31

Looking for developer videos/demos/webcasts tutorials

29-Dec-02 11:31

Hi,

do you know other developer boards?

special C# and VB and C++

gicio

gicio29-Dec-02 11:30

Re: Looking for developer videos/demos/webcasts tutorials

29-Dec-02 11:30

Hi,

I'm looking for developer videos/demos/webcasts tutorials
for c#, VB.NET, VB, C++, JAVA, UML, Rational rose, XML, XSLT, SQL and other
development stuff.

I know right now only the microsoft webcasts and the stuff from
www.learnvisualstudio.net do you know others?

gicio

Anonymous25-Feb-03 4:15

Anonymous

25-Feb-03 4:15

Here:

http://www.banasoft.net/avphone3/demos/sourcedemo.htm

Reflection and 'ref' parameter

29-Dec-02 1:03

I need to invoke a methods using reflection. I don't know how to get the variable reference so I can invoke the methods with 'ref' parameter. Same problem with 'out'.

Re: Reflection and 'ref' parameter

Anonymous29-Dec-02 7:41

Anonymous

29-Dec-02 7:41

The parameteres you pass to the invoke method are put in an object[]. When you call a function with a ref or out parameter, the value will come back as part of that array.

Modal Windows?

gekoscan28-Dec-02 22:47

28-Dec-02 22:47

Hey. I have a main form which uses a modal dialog box. When the user hits a button on the modal dialog I then proceed to close the modal dialog and return to the main form..

I am closing the modal dialog box from inside itself. OnbuttonClick();

ie ... OnButtonClick()
{
this.Close();
}

It gives me this!

An unhandled exception of type 'System.InvalidOperationException' occurred in system.windows.forms.dll

Additional information: Forms that are already displayed modally cannot be displayed as a modal dialog. Close the form before calling showDialog.

I have no clue why it isn't working.. If anyone could help it would be hugely appreciated. Thanks..

Re: Modal Windows?

Stephane Rodriguez.28-Dec-02 23:36

Stephane Rodriguez.

28-Dec-02 23:36

this.DialogResult = DialogResult.Cancel; is enough to do the trick.

Umm... same error

gekoscan29-Dec-02 2:03

Insite on what i am trying to accomplish

29-Dec-02 2:03

Even when i do that is still throws an error...

What I am doing is I have my main form.. My main form calls .ShowDialog() of another form... and then that form calls .ShowDialog() again.

So i have a my main window which calls show and then the new window calls show

When i do: this.DialogResult = DialogResult.Cancel;

You can see it close the appropriate form but then it throws an error.

Please help.. Thanks...

gekoscan29-Dec-02 2:10

Re: Insite on what i am trying to accomplish

29-Dec-02 2:10

Basically what I am doing is a touch screen application.. And each modal dialog of a form ie. .ShowDialog is an attempt to show a new screen to the user.. So I have my main form with some buttons and the user clicks a button.. This brings the user to a new screen or form. And when the user clicks another button on that form it brings him to another form.

What would be the best way to go about displaying these forms? They have to be forms.. Cause I am using the opacity of the forms to do fading from screen to screen.. But if the user wants to go back to a previous form. I need a way to close the form without some error like I am getting now.

If anyone could help.. It would be the hugest help..

Thanks so much.

Stephane Rodriguez.29-Dec-02 3:30

Stephane Rodriguez.

29-Dec-02 3:30

Why is this modal at all ? If you need a sequence of forms with clickable buttons, you just need to show the forms. I recommend you replace all those .ShowDialog() calls with simple .Show() calls.

More Insite and thank you.

gekoscan29-Dec-02 9:58