Xml Serialization - C# Discussion Boards

Character not recognised when reading file

18-Jul-07 22:51

Hello,

I think it's best to create an image for your panel and get a Graphics object from that.
With this Graphics object you than can do a lot of fancy stuff.

Here is an example with an panel and MouseMove event:

private Graphics panelGraphics = null;
private Pen panelPen = null;
private Point oldPosition;
private bool init=false;
private void panel2_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
    if(panel2.BackgroundImage==null)
    {
        panel2.BackgroundImage= new Bitmap(panel2.Width, panel2.Height);
    }
    if(panelGraphics==null)
        panelGraphics = Graphics.FromImage(panel2.BackgroundImage);

    if(panelPen==null)
        panelPen= new Pen(Color.Red,2);

    if(init)
    {
        Point newPostion = new Point(e.X,e.Y);
        panelGraphics.DrawLine(panelPen, oldPosition, newPostion);

        Refresh();
    }
    else
        init=true;

    oldPosition = new Point(e.X,e.Y);
}

Hope it helps!

Note: I instanciated the Graphics and Pen objevt only once, but you have to dispose them in your forms Dispose method.

panelGraphics.Dispose();
panelPen.Dispose();

All the best,

Martin

Sean_B18-Jul-07 22:10

Sean_B

18-Jul-07 22:10

Hi,

I'm reading a file using the stream reader into a string, and the character £ which is in the file appears as a sqare box in the string, which I assume means it is unrecognised.
I'd be grateful if someoone can tell me how to get round this.

Sean

Re: Character not recognised when reading file

Guffa18-Jul-07 23:52

Guffa

18-Jul-07 23:52

If the file is not encoded using UTF-8, you have to specify the encoding when creating the stream reader.

---
single minded; short sighted; long gone;

Xml Serialization

jpeg18-Jul-07 21:58

jpeg

18-Jul-07 21:58

Hello, I have one problem in serializing a class using .NET Serialization

for example, I have got something like this :

<br />
class Parking<br />
{<br />
  public List<Vehicle> vehicles<br />
  public Parking() { /*...*/ }<br />
<br />
  /* */<br />
}<br />
<br />
class Vehicle <br />
{<br />
  /* .... */<br />
}<br />
  <br />
class Truck:Vehicle<br />
{<br />
  /* .... */<br />
}<br />
<br />
class Car:Vehicle<br />
{<br />
  /* .... */<br />
}<br />
<br />
class Motorbike:Vehicle<br />
{<br />
  /* .... */<br />
}<br />

I have been trying to serialize a 'Parking' object and the better I got was :

<br />
<parking><br />
    <Vehicles><br />
    <Car> .... </Car><br />
    <Car> .... </Car><br />
    <Truck> .... </Truck><br />
    <Car> .... </Car<br />
    <Truck> .... </Truck><br />
    <Motorbike> .... </Motorbike><br />
    .....<br />
  </Vehicles><br />
</parking>

But my aim is to get this type of XML string (no 'Vehicles' node):

<br />
<parking><br />
  <Car> .... </Car><br />
  <Car> .... </Car><br />
  <Truck> .... </Truck><br />
  <Car> .... </Car<br />
  <Truck> .... </Truck><br />
  <Motorbike> .... </Motorbike><br />
  .....<br />
</parking><br />

Have you got any idea to obtain this result ?
Thank you for your help !

jpeg

Eduard Keilholz18-Jul-07 22:50

Eduard Keilholz

18-Jul-07 22:50

You can ignore object from being xml serialized using the XmlIgnore attribute

<br />
[XmlIgnore()]<br />
public List vehicles<br />

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

jpeg18-Jul-07 23:43

jpeg

18-Jul-07 23:43

Thank you Eduard for your answer but my problem is not to exclude the list.

The class Parking only contain a List<Vehicle> called 'Vehicles'.

the problem is that I get :

<parking><br />
  <vehicles><br />
     .... all vehicules (classes Car, Truck, Motorbike ...)<br />
  </vehicles><br />
</parking><br />

I only want the 'vehicles' tags to disappear and 'Car', 'Motorbike' or 'Truck' vehicles to inside the 'parking' tags.

With your solution, I get :
</parking> (the content of the 'Vehicles' list is not serialized)

jpeg

Martin#18-Jul-07 23:49

18-Jul-07 23:49

Hello,

I don't think that you could deserialze it correctly once it was modified this way.
And I also don't think there is a way to serialize it the way you want it.

All the best,

Martin

Eduard Keilholz19-Jul-07 0:01

Eduard Keilholz

19-Jul-07 0:01

I think there is, you need to customize the serialization process by making your class IXmlSerializable and use the WriteXml() and ReadXml() functions to write your custom XML message, and Read it when the objects is being deserialized.

The WriteXml and ReadXml will be called by you serializer...

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

Martin#19-Jul-07 0:08

C# getting keyboard inputs

19-Jul-07 0:08

This sounds like it could end up in a nice article.
Hope somebody takes his time to share it.

All the best,

Martin

Treeview problem

MoeInsairat18-Jul-07 21:36

MoeInsairat

18-Jul-07 21:36

Hello folks.

how can use a javascript so that if i clicked on a treenode it wont post back to the server and close the root tree!
what im asking, if there is anyway to do it using javascript so when i click on a tree node it wont close the root.

thanks in advanced

Estarta

mercenary0118-Jul-07 20:37

mercenary01

18-Jul-07 20:37

How do I get keyboard inputs like 'X' to exit and maybe right arrow to go to next frame, etc. I tried

protected override void OnKeyDown(KeyEventArgs e)
{
if(e.KeyCode == Keys.X);
Close();
}

ut I am not sure about the event handler I need to put out

Thanks!

Samuel

mav.northwind18-Jul-07 21:16

mav.northwind

18-Jul-07 21:16

Hi!
What's wrong with the code? What do you mean by "putting out" an event handler? Your implementation of OnKeyDown is a way to handle the KeyDown event...

Regards,
mav

--
Black holes are the places where God divided by 0...

satsumatable18-Jul-07 22:15

satsumatable

18-Jul-07 22:15

Like the below

Convert.ToInt32 (e.KeyChar ) == 95 // this is for 'a'

you can find constant integer valus of X and validate against it then proceed.

C# getting keyboard inputs

Luc Pattyn18-Jul-07 22:31

Luc Pattyn

18-Jul-07 22:31

Hi,

there are several Keyboard events:

- KeyDown and KeyUp events provide e.KeyCode (type Keys) and e.KeyValue (the int value of KeyCode); it also fires when pressing/releasing modifier keys (CTRL, ALT, SHIFT, ...)
- for printable keys (the ones that normally add text in a text editor) you
better use KeyPress event which provides e.KeyChar (char), so you dont need to refer
to the Keys enumeration nor the explicit conversion to integers.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

mercenary0118-Jul-07 20:37

mercenary01

18-Jul-07 20:37

Martin#18-Jul-07 21:03

18-Jul-07 21:03

Hello,

On your MainForm you have to set the "KeyPreview" property and handle KeyPress.

    //constructor code
    this.KeyPreview = true;
}
 
protected override void OnKeyPress(KeyPressEventArgs e)
{
    if(e.KeyChar.Equals('X')||e.KeyChar.Equals('x'))
	Close();
    else
        base.OnKeyPress (e);
}

Hope it helps!

All the best,

Martin

mercenary0118-Jul-07 21:19

mercenary01

18-Jul-07 21:19

Yes It Worked, exactly what I was looking for. Thanks Martin!

Martin#18-Jul-07 21:21