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Wait for C# 4.0? (Covariance and contravariance?)
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ok I am a little confused.
I have a control textbox and checkbox that I need to read from in a separate class. How do you do this. I just need to read the checked and text values into the class that is not the form.
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One whay is to make those values static. and then it will be shared among all instance of a form
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If the other class has a reference to the form instance, you can either make the two control objects public members of the form class, or add two "get" methods to the form that just return the desired properties of the two control.
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It depends on the relationship between the class and the form with those controls.
If the form instanciates the class then you can set properties in the class when the controls change.
If the class instanciates the form then the class can read any custom public properties you create on the form, or better still, the form can raise custom events which the class can subscribe to.
If they are only related by a common ancestor, the form can raise events that bubble up to the common ancestor, and that can in turn set a chain of property changes or method calls back down the line to the class.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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This is the code I want to call by 1 procedure retruning a bool value
private void EnableDisableSaveChanges(String txtboxName, String txtValue)
{
if (ckbxUniqueName.Checked == true)
{
if (HastxtAppNameControlValueChanged & HastxtVerNumberControlValueChanged & HastxtServerLocControlValueChanged & HastxtServerFileNameControlValueChanged & HastxtClientLocFileNameControlValueChanged & HastxtClientFileNameControlValueChanged & HasckbxMasterApplicationControlValueChanged & HasckbxCreateShortcutControlValueChanged & HasckbxUniqueNameControlValueChanged & HasrbtnClientMachineControlValueChanged & HasrbtnClientUserControlValueChanged)
{
btnSaveChanges.Enabled = true;
}
else
{
btnSaveChanges.Enabled = false;
}
}
else
{
if (HastxtAppNameControlValueChanged & HastxtVerNumberControlValueChanged & HastxtServerLocControlValueChanged & HastxtServerFileNameControlValueChanged & HastxtClientLocFileNameControlValueChanged & HastxtClientFileNameControlValueChanged & HasckbxMasterApplicationControlValueChanged & HasckbxCreateShortcutControlValueChanged & HasckbxUniqueNameControlValueChanged)
{
btnSaveChanges.Enabled = true;
}
else
{
btnSaveChanges.Enabled = false;
}
}
This is the code I want in a seperate class with a main procedure I can call to return a bool value which is above...
#region Validate if a change has occured to any of the fields on tab 1.
private Boolean HastxtAppNameControlValueChanged()
{
if (txtAppName.Text == UnchangedAppNameField || txtAppName.Text == null || txtAppName.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HastxtVerNumberControlValueChanged()
{
if (txtVerNumber.Text == UnchangedAppVersionField || txtVerNumber.Text == null || txtVerNumber.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HastxtServerLocControlValueChanged()
{
if (txtServerLoc.Text == UnchangedServerPathLocField || txtServerLoc.Text == null || txtServerLoc.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HastxtServerFileNameControlValueChanged()
{
if (txtServerFileName.Text == UnchangedServerFileNameField || txtServerFileName.Text == null || txtServerFileName.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HastxtClientLocFileNameControlValueChanged()
{
if (txtClientLoc.Text == UnchangedClientPathLocField || txtClientLoc.Text == null || txtClientLoc.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HastxtClientFileNameControlValueChanged()
{
if (txtClientFileName.Text == UnchangedClientFileNameField || txtClientFileName.Text == null || txtClientFileName.Text == "")
{
return false;
}
else
{
return true;
}
}
private Boolean HasckbxMasterApplicationControlValueChanged()
{
if (ckbxMasterApplication.Checked == UnchangedMasterAppField)
{
return false;
}
else
{
return true;
}
}
private Boolean HasckbxCreateShortcutControlValueChanged()
{
if (ckbxCreateShortcut.Checked == UnchangedCreateShortcut)
{
return false;
}
else
{
return true;
}
}
private Boolean HasckbxUniqueNameControlValueChanged()
{
if (ckbxUniqueName.Checked == UnchangedUniqueName)
{
return false;
}
else
{
return true;
}
}
private Boolean HasrbtnClientMachineControlValueChanged()
{
if (rbtnClientMachine.Checked == UnchangedClientMachine)
{
return false;
}
else
{
return true;
}
}
private Boolean HasrbtnClientUserControlValueChanged()
{
if (rbtnClientUser.Checked == UnchangedClientUser)
{
return false;
}
else
{
return true;
}
}
#endregion
modified on Monday, August 17, 2009 6:03 PM
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If i change the methods to static functions I can no longer access the form controls. Please help. I believe at least a static function is what I want but I need to be able to access the forms controls values...)
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You almost never want a static function when dealing with an instance, for obvious reasons.
Strip out all that code and checking a million different properties/fields/controls/whatever - the same principle applies even if there is just one that needs to be checked. It will then be clearer to both us and you!
Unless I missed it somewhere way off screen to the right with all the scrolling, I don't see the relationship between the classes - what instanciates what here?
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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Here is what I am trying to do...
I want to be able to receive a response of true or false when these values change.
The Unchanged... is the variable with the current value.
without doing
if (txtAppName.Text == UnchangedAppNameField)
{something...}
I want to have something that says
if (btxtAppName)
{somehting...}
or say (This is the way I would like to do it.)
if (SomeClass.AreThereAnyChanges)
{something}
My main problem is I do not know how to access the forms controls from the class.
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It is too late here for me to make any sense of your problem (my fault, not yours), but your code wouldbe a little shorter and therefore possibly easier to understand if you replace this (and all the ones like it):
private Boolean HasckbxMasterApplicationControlValueChanged()
{
if (ckbxMasterApplication.Checked == UnchangedMasterAppField)
{
return false;
}
else
{
return true;
}
}
with:
private Boolean HasckbxMasterApplicationControlValueChanged()
{
return !(ckbxMasterApplication.Checked == UnchangedMasterAppField);
}
or, of course:
private Boolean HasckbxMasterApplicationControlValueChanged()
{
return (ckbxMasterApplication.Checked != UnchangedMasterAppField);
}
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I agree with Dave and Henry:
- static won't help
- more compact code could make it manageable.
Luc Pattyn [Forum Guidelines] [My Articles]
The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.
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Hi everyone,
What i an trying to do is, call Form1_Load again on say button click in such a way that it resets the form's controls to default values.
Please help by giving your suggestions.
Thanks..!!
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You could always just call Form_Load manualy like a method, passing in null as paramaters. This wouldn't reset your values though unless your Form_Load initializes all the values.
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If I were attempting this, I would have a function that would set all the values to their defaults (say initForm) and I would just call that from Form1_Load or anywhere else I wanted to reset the form.
For example;
protected void Form1_Load(){
initForm();
...
}
protected void Button1_Click(object sender, EventArgs args){
initForm();
...
}
private void initForm(){
Textbox1.text = "[Default Value]";
Textbox2.text = "[Default Value]";
...
}
If at first you don't succeed ... post it on The Code Project and Pray.
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I would use binding here. Basically, have your data objects contain the default values and use binding on these objects.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Hi,
if the form got designed using Visual Designer, then its constructor starts with an empty Form and populates it by calling InitializeComponent(). You can always:
- remove all the Controls
- call InitializeComponent() again.
To get a fresh looking form without creating a new one.
Luc Pattyn [Forum Guidelines] [My Articles]
The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.
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Hi everybody I posted this question on sunday & i didnt get an answer..... so I repost it agian... here it is
I am just trying to do some application in C#(like to transfer data from 1 pc to another) from my Network knowledge(up to I have learned),If one of the computer is set not accept connections ,it will not accept data transfers or other connections. So while I was trying to connect to the other PC using C# , is there a way to know such kind of problems or is it possible to open the connection ? If there is something wrong on my question please notify me .
Thank you.
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If you just want to call that method from your code, try this.
targetTextBox.Text = GetHostNameByIp ( sourceTextBox.Text ) ;
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Ok!
It´s a code to show me the Host from a Ip and he must get the ip from where!
And how can i add a code to read the Ip from a textbox out?
then the host name should he show me in another textbox or in the same
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The code in the example I gave you should be what you need.
targetTextBox.Text = GetHostNameByIp ( sourceTextBox.Text ) ;
Or try this.
string ipAddress = sourceTextBox.Text ;
string hostName = GetHostNameByIp ( ipAddress ) ;
targetTextBox.Text = hostName ;
This is the same as the single-line example.
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thank you for help 
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Hello guru's,
I'm experimenting with MVP for a while now and I'm wondering, why in some implementations the model has to know about the view (e.g. WinForms Model View Presenter[^] ).
Why not simply implementing the model as a "subject" (Observer-Pattern) which raises events which are consumed by the views.
Thanks in advance
modified on Monday, August 17, 2009 1:17 PM
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IMNSHO the Model should not necessarily know about the View, So the Delegate/Event methodology (one of the .NET implementations of Observer) is the best way to achieve that.
A lorra, lorra plumbing though.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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