remote delegate handling - C# Discussion Boards

Re: Raise an event whenever a property’s value changed ?

Not Active11-Feb-10 8:18

Not Active

11-Feb-10 8:18

INotifyPropertyChanged uses events and is there just for what you are asking.

I know the language. I've read a book. - _Madmatt

Re: Raise an event whenever a property’s value changed ?

Ennis Ray Lynch, Jr.11-Feb-10 11:20

Ennis Ray Lynch, Jr.

11-Feb-10 11:20

I just hate the fact that it uses a string, however.

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Re: Raise an event whenever a property’s value changed ?

The Man from U.N.C.L.E.11-Feb-10 13:08

The Man from U.N.C.L.E.

11-Feb-10 13:08

Use the alternative approach with the same result. You need a specifically named event with the default eventArgs the name must be YOURPROPERTYChanged . For best practice also supply and OnYOURPROPERTYChanged method as well. e.g.

private string _MyProperty;

public string MyProperty {
  Get { return this._MyProperty; }
  Set {
    If (this._MyProperty != value){
      this._MyProperty = value;
      this.OnMyPropertyChanged(EventArgs.Empty);
    }
  }
}

public virtual void OnMyPropertyChanged(EventArgs e){
  if (this.MyPropertyChanged != null){
    this.MyPropertyChanged(this, e);
  }
}

public EventHandler MyPropertyChanged;

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Re: Raise an event whenever a property’s value changed ?

Ennis Ray Lynch, Jr.11-Feb-10 15:46

Ennis Ray Lynch, Jr.

11-Feb-10 15:46

I don't recall asking a question to which this was the answer.

Re: Raise an event whenever a property’s value changed ?

The Man from U.N.C.L.E.12-Feb-10 3:45

The Man from U.N.C.L.E.

12-Feb-10 3:45

Sorry, replied at the wrong level in the thread.

My appologies

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Re: Raise an event whenever a property’s value changed ?

The Man from U.N.C.L.E.12-Feb-10 3:47

The Man from U.N.C.L.E.

12-Feb-10 3:47

Posted in reply to the wrong message earlier. Apologies.

Use the alternative approach with the same result. You need a specifically named event with the default eventArgs the name must be YOURPROPERTYChanged . For best practice also supply and OnYOURPROPERTYChanged method as well. e.g.

private string _MyProperty;

public string MyProperty {
  Get { return this._MyProperty; }
  Set {
    If (this._MyProperty != value){
      this._MyProperty = value;
      this.OnMyPropertyChanged(EventArgs.Empty);
    }
  }
}

public virtual void OnMyPropertyChanged(EventArgs e){
  if (this.MyPropertyChanged != null){
    this.MyPropertyChanged(this, e);
  }
}

public EventHandler MyPropertyChanged;

If you have knowledge, let others light their candles at it.
Margaret Fuller (1810 - 1850)
[My Articles] [My Website]

Re: Raise an event whenever a property’s value changed ?

Mohammad Dayyan12-Feb-10 5:50

Mohammad Dayyan

12-Feb-10 5:50

Thanks

remote delegate handling

kasraa0009800011-Feb-10 7:33

kasraa00098000

11-Feb-10 7:33

hi,
in my case, i have a lan using sql server as data server, now one client insert or update some important data that it's highly recommended to another clients understand this operation, is there any way to make a remote delegate on all clients or something like this
ty

Re: remote delegate handling

#realJSOP11-Feb-10 7:39

#realJSOP

11-Feb-10 7:39

My first thought is that you'd probably have to setup a communications system with a central server that performed the database operations, and then notified all of the clients of the change.

.45 ACP - because shooting twice is just silly
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Re: remote delegate handling

kasraa0009800011-Feb-10 22:19

kasraa00098000

11-Feb-10 22:19

thanks for ur answer,
u right, look im going to do this as easy as possible, bcoz fee for this work is only 50$. Frown | :(

Re: remote delegate handling

Not Active11-Feb-10 8:21

Not Active

11-Feb-10 8:21

You could use SqlDependency to keep clients updated when the database has changed. Using SqlDependency for data change events[^]

I know the language. I've read a book. - _Madmatt

Re: remote delegate handling

kasraa0009800011-Feb-10 22:14

kasraa00098000

11-Feb-10 22:14

thanx for ur answer, in my case I have 1milion record in my cached table in my form, so if 1 record has changed,then by using sqldependency 1milion record must be retrived again! is it possible to understand which record has been changed?

Re: remote delegate handling

Not Active12-Feb-10 1:50

Not Active

12-Feb-10 1:50

1 million? I doubt that.

Have you read the documentation? Have you actually tried it?

I know the language. I've read a book. - _Madmatt

alternitive to CurrentForm CurForm = new CurrentForm();

tyjnfghnfgsdf11-Feb-10 7:17

tyjnfghnfgsdf

11-Feb-10 7:17

Hi im building a program to scrape links from a webpage, To prevent the document complete even tfiring multiple times ive set it to the function below.

public void BrowserCallback(object sender, EventArgs e)
       {
           WebBrowser Thread = (WebBrowser)ThreadViewer.Controls["Thread"];
           while (Thread.ReadyState.ToString() != "Complete")
           {
               Application.DoEvents();
           }
           LinkScraper CurrentForm = new LinkScraper();
           MethodInfo methodInfo = typeof(LinkScraper).GetMethod(NextFunction);
           methodInfo.Invoke(CurrentForm, null);
       }

My problem is that referencing the current form with

LinkScraper CurrentForm = new LinkScraper();

wipes out all the created controls from the previous method, Is there any way to use methodInfo.Invoke without having the same issue ?

Re: alternitive to CurrentForm CurForm = new CurrentForm();

#realJSOP11-Feb-10 7:41

#realJSOP

11-Feb-10 7:41

First, you should be posting this in the asp.net forum.

Second, you could store the data in server variables (there's a word for these, but I can't for the life of me remember it) and retrieve them in the new instance of the form.

Re: alternitive to CurrentForm CurForm = new CurrentForm();

Luc Pattyn11-Feb-10 10:40

Luc Pattyn

11-Feb-10 10:40

If this is a WinForms app (I can't tell from your post), then:
1. you are in the right forum;
2. if using WebBrowser, you should rely on the WebBrowser.DocumentCompleted event (and watch the URL that goes with it to decide whether it is the last one)
3. if you don't need to see the web page, you would be better of using HttpRequest and HttpResponse, which don't use any Control, and can work synchronously. This is how I do most web scraping.

Some coding comments:
1. a WebBrowser and a Thread are two different things, so calling a WebBrowser Thread is confusing everyone, you in the first place.
2. having a loop of DoEvents() is a horrible hack.
3. you should not use strings for something that is not inherently a string, so please replace Thread.ReadyState.ToString() != "Complete" by Thread.ReadyState!=WebBrowserReadyState.Complete

tyjnfghnfgsdf wrote:
To prevent the document complete even tfiring multiple times ive set it to the function below.

I don't understand you here. Is this the method that will handle the DocumentCompleted event? having it wait for completion doesn't achieve much; the multiple events will fire anyway, so they will get queued in the message queue and confuse you with some delay.

Smile | :)

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How to close all form but not application.exit()

nuttynibbles11-Feb-10 5:01

nuttynibbles

11-Feb-10 5:01

hi,

i have a main form. it has list view of items that when clicked will open up another form without closing the main form.

i did a inactivity timeout where user will be require to login again. if that happen, how do i close all current open form??

Re: How to close all form but not application.exit()

N a v a n e e t h11-Feb-10 5:06

N a v a n e e t h

11-Feb-10 5:06

You need to keep form objects that are open in a collection. When relogin requires, loop through this list and dispose everything.

Best wishes,
Navaneeth

Re: How to close all form but not application.exit()

OriginalGriff11-Feb-10 5:09

OriginalGriff

11-Feb-10 5:09

N a v a n e e t h wrote:
loop through this list and ~~dispose~~ closeeverything.

Don't use dispose on a form that is currently displayed - unpredictable things may occur!

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: How to close all form but not application.exit()

N a v a n e e t h11-Feb-10 5:24

N a v a n e e t h

11-Feb-10 5:24

When I say dispose everything, I didn't meant to call Dispose() method. BTW, how it can cause unpredictable things? Confused | :confused:

Best wishes,
Navaneeth

Re: How to close all form but not application.exit()

OriginalGriff11-Feb-10 5:38

OriginalGriff

11-Feb-10 5:38

If the form has a background thread working, it could be using resources that you have disposed.

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: How to close all form but not application.exit()

OriginalGriff11-Feb-10 5:08

OriginalGriff

11-Feb-10 5:08

Application.OpenForms will return a Forms[] for all open forms. You can for loop through it closing the ones you no longer need (with Form.Close(), obviously). Do not try to foreach loop through, as the Close() may remove it from the array.

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: How to close all form but not application.exit()

nuttynibbles11-Feb-10 5:21

nuttynibbles

11-Feb-10 5:21

im implementing windows mobile using compact framework so there isn't application.openforms.

is there something else similar?

Re: How to close all form but not application.exit()

OriginalGriff11-Feb-10 5:32

OriginalGriff

11-Feb-10 5:32

Not unless you create it yourself - keep a copy of the form object when you do the create, chain into the FormClosing event and remove it when it closes. You can then manually Close() each open instance.

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: How to close all form but not application.exit()

nuttynibbles11-Feb-10 5:46

nuttynibbles

11-Feb-10 5:46

hi OriginalGriff,

what you mean is to create a class which act as a application hub that store all created form instances??

im sorry but wat do u mean by chain into the formClosing event?

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