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Re: how to use delegate to call function and introduce function as content?

Eddy Vluggen30-Nov-15 23:16

30-Nov-15 23:16

Stop the user from scrolling, panning and/or zooming, and you don't need to refresh.

If anything changes, a refresh would be required to get the updated data on screen.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: how to use delegate to call function and introduce function as content?

smallkubi1-Dec-15 13:59

smallkubi

1-Dec-15 13:59

Now i want to have the function of Zooming,scrolling... Anything changes, screen don't update automatically,I want to updated data on screen mannully, can it be possible?

Re: how to use delegate to call function and introduce function as content?

Eddy Vluggen1-Dec-15 23:59

Eddy Vluggen

1-Dec-15 23:59

Sure; use the drawing functions to draw your chart. Means writing code to calculate the length of the axes, drawing each point, drawing some labels.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: how to use delegate to call function and introduce function as content?

smallkubi4-Dec-15 19:23

smallkubi

4-Dec-15 19:23

Hi, i have another question...
If i want to use multi-thread to call fun1, how can i input the variable x, y,z?
for example:
static void Main()
{
int x = 1;
int z = 3;
Thread th=new Thread(fun1( ? )) //how can i do ?
th.start();
// fun1(x, y => fun2(y));
// fun1(x, y => fun3(y, z));
}

static void fun1(int x, Action<int> call)
{
call(x);
}

static void fun2(int y) { ... }
static void fun3(int y, int z) { ... }

Re: how to use delegate to call function and introduce function as content?

Richard Deeming7-Dec-15 0:32

Richard Deeming

7-Dec-15 0:32

Something like this:

Thread th = new Thread(() => fun1(x, y => fun3(y, z)));

Breaking it down:

Action<int> call = y => fun3(y, z);
ThreadStart start = () => fun1(x, call);
Thread th = new Thread(start);

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: how to use delegate to call function and introduce function as content?

smallkubi7-Dec-15 5:51

smallkubi

7-Dec-15 5:51

Good Idea,i meet it.
And if i have a button at main Thread , it can abort Thread "th". How to code button click function?
And, if whether Thread th end or abort, i want to run" MessageBox.Show("Thread end")", how can i do it?

Re: how to use delegate to call function and introduce function as content?

Richard Deeming7-Dec-15 6:55

Richard Deeming

7-Dec-15 6:55

smallkubi wrote:
it can abort Thread "th"

Don't.
How To Stop a Thread in .NET (and Why Thread.Abort is Evil)[^]

If you're using .NET 4.5 or above, you'd probably have better luck using async and await.
Asynchronous Programming with Async and Await (C# and Visual Basic)[^]

Otherwise, use something like the BackgroundWorker component[^].

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: how to use delegate to call function and introduce function as content?

smallkubi19-Dec-15 6:50

smallkubi

19-Dec-15 6:50

hi,
If i use Func<double,double> call= y=>fun3(y,z) , fun3 can be one output param function. But if my function need 2 or more output, how can i do it?

Re: how to use delegate to call function and introduce function as content?

Richard Deeming4-Jan-16 2:21

Richard Deeming

4-Jan-16 2:21

Sorry, I'm not following you.

Do you mean you want multiple return values from your function? If so, you'll need to create a class or structure to contain them:

public struct Fun3ReturnValues
{
    public int SomeValue { get; set; }
    public string SomeOtherValue { get; set; }
}
...
public static Fun3ReturnValues Fun3(int y, int z)
{
    return new Fun3ReturnValues
    {
        SomeValue = 42,
        SomeOtherValue = "Hello",
    };
}

Alternatively, you could use the Tuple class[^], but the meaning of the values wouldn't be as clear.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Order number of datagridview ?

Member 245846729-Nov-15 15:36

Member 2458467

29-Nov-15 15:36

I want to create order number for datagridview like attach file the image (circled in red) what have I need nothing to declare ? see attached image [IMG]http://s1.postimg.org/3yjk6rhsv/dgv_row_number1a.jpg[/IMG]

Re: Order number of datagridview ?

Eddy Vluggen30-Nov-15 2:28

Eddy Vluggen

30-Nov-15 2:28

http://stackoverflow.com/questions/9581626/show-row-number-in-row-header-of-a-datagridview[^]

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: Order number of datagridview ?

Member 245846730-Nov-15 15:04

Member 2458467

30-Nov-15 15:04

thank you

Monitoring FTP-Server incomming

gpc4427-Nov-15 3:40

gpc44

27-Nov-15 3:40

Hi,

I want a quick feedback as soon as a particular file is on an FTP server. What is the most effective way to get this information quickly?

File is comming daily from a service-provider.
File is stored in ftp-FileSystem with fix name+[Date]
Software is running on a Server (C# or Powershell)
We need this file asap after incomming to ftp-Server
(can we implement a FTP-Event for watching incomming Sigh | Sigh | :sigh:

)

Thanks &
Regards
Nicole

modified 27-Nov-15 9:54am.

Re: Monitoring FTP-Server incomming

Richard MacCutchan27-Nov-15 3:44

Richard MacCutchan

27-Nov-15 3:44

Get it from where, where does the file come from, where is it stored, is your software running on the server or on a client, etc?

Please edit your question and add some context and proper detail.

Re: Monitoring FTP-Server incomming

gpc4427-Nov-15 3:50

gpc44

27-Nov-15 3:50

File is comming daily from a service-provider.
File is stored in ftp-FileSystem with fix name+[Date]
Software is running on a Server (C# or Powershell)
We need this file asap after incomming to ftp-Server
(can we implement a FTP-Event for watching incomming Sigh | :sigh:

)

Re: Monitoring FTP-Server incomming

Richard MacCutchan27-Nov-15 4:03

Richard MacCutchan

27-Nov-15 4:03

You can use https://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher(v=vs.110).aspx[^].

Re: Monitoring FTP-Server incomming

Dave Kreskowiak27-Nov-15 4:10

Dave Kreskowiak

27-Nov-15 4:10

Keep in mind no matter what you use to tell you that the "file is there" it is merely telling you that the filename has been created. It will not tell you if the file has something in it or that the file transfer from the uploader has completed.

A guide to posting questions on CodeProject

Click this: Asking questions is a skill.
Seriously, do it.

Dave Kreskowiak

Re: Monitoring FTP-Server incomming

jschell27-Nov-15 6:05

jschell

27-Nov-15 6:05

Very true.

Only sure way I have found for this is to require that a marker file be laid down after all other transfers have been completed.

How do I pass data from child of child form to parent form in C#?

naouf1026-Nov-15 5:34

naouf10

26-Nov-15 5:34

I am new to c#. I have the following in my project in windows forms:

Form1 with button and DataGridView.

Form2 with button.

Form3 with button and 3 textBoxes.

In form1, I click buttonOpenForm2 form2 pops up. Then in form2 I click buttonOpenForm3 form3 pops up which has 3 text boxes and button. Now the 3 forms are open.

now in form3, I enter values in textBox1, textBox2 and textBox3 and when click buttonAddRow ( from form3) I want these values to be inserted into the DataGRidView in Form1.

My question is: How can I add a row into DataGridView in Form1 ( parent) from form3 (child of child form) WITHOUT closing form2 and form3? I mean I want to pass the data while form2 and form3 are still open.

Please help me. Thank you

Form1:

public partial class Form1 : Form
{


    public Form1()
    {
        InitializeComponent();

    }

    private void buttonOpenForm2 _Click(object sender, EventArgs e)
    {
        Form2 frm2 = new Form2();
        frm2.Show();
    }

}


Form2:

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }

    private void buttonOpenForm3 _Click(object sender, EventArgs e)
    {
        Form3 frm3 = new Form3();
        frm3.Show();
    }
}



Form3:

  public partial class Form3 : Form
  {
    public Form3()
    {
        InitializeComponent();
    }

    private void buttonAddRow _Click(object sender, EventArgs e)
    {
        //What to write here to insert the 3 textboxes values into DataGridView?

    }
}

Re: How do I pass data from child of child form to parent form in C#?

OriginalGriff26-Nov-15 6:15

OriginalGriff

26-Nov-15 6:15

Use events and properties: Form3 signals to it's "parent" Form2, which gathers the data and signals an event to it's parent, Form1.

Sound complex, but it's really simple!
See here: Transferring information between two forms, Part 2: Child to Parent[^]

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Re: How do I pass data from child of child form to parent form in C#?

naouf1027-Nov-15 8:50

naouf10

27-Nov-15 8:50

Hi, thank you for the help, I will have to study the properties and events then i will test the code written in the answer. thank you

Re: How do I pass data from child of child form to parent form in C#?

OriginalGriff27-Nov-15 9:09

OriginalGriff

27-Nov-15 9:09

You're welcome!

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Re: How do I pass data from child of child form to parent form in C#?

BillWoodruff26-Nov-15 12:07

BillWoodruff

26-Nov-15 12:07

What was wrong with the answer you got on November 6th. when you asked the same question: [^] ?

Why use three Forms when you can use one Form and UserControls ?

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

Re: How do I pass data from child of child form to parent form in C#?

naouf1027-Nov-15 8:51

naouf10

27-Nov-15 8:51

Hi . nothing wrong but i am new to c# and i have to study the events and property then i will test the code. yes i will try to use form and user control instead, thank you

Re: How do I pass data from child of child form to parent form in C#?

susad7-Dec-15 3:05

susad

7-Dec-15 3:05

Build some business logic, i.e. class(es) for storing the text entered form3 and pass it/them to form1 in buttonAddRow_Click

or make something like this

public struct EnteredText
{
 public string t1, t2, t3;
};

public partial class Form3 : Form
{
 public delegate void ButtonClick(EnteredText data);
 public event ButtonClick OnClick;
...
 private void buttonAddRow _Click(object sender, EventArgs e)
    {
        EnteredText args;
        args.t1 = textbox1.Text; args.t2 = ...
        if (OnClick != null)
            OnClick(args);
    }
}

Means you copy the text from the boxes into the struct and fire the event OnClick. Somewhere in Form2 you should do something like this:

 Form3 f3 = new Form3();
 f3.OnClick += f3_OnClick;
 f3.Show();
}
private void f3_OnClick(EnteredText txt)
{
// do something with the text or refire a new event.
}

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