Re: Strange List behaviour... - C# Discussion Boards

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Re: filtering of comboboxes

bdeklerk18-Jul-12 22:21

bdeklerk

18-Jul-12 22:21

That works great. Thanks for the help guys and special thanks to Wayne Gaylard. Big Grin | :-D

Re: filtering of comboboxes

bdeklerk18-Jul-12 22:22

bdeklerk

18-Jul-12 22:22

How do i close this thread now guys?

Re: filtering of comboboxes

Wayne Gaylard18-Jul-12 22:31

Wayne Gaylard

18-Jul-12 22:31

Just modify your subject line by adding SOLVED on the end. The thread will remain for ever more in the annals of history.

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

bluetooth file transfer b/w to windows mobile

syedaliaizazuddin18-Jul-12 19:56

syedaliaizazuddin

18-Jul-12 19:56

hi all,

i want a application that can send sms via bluetooth in two different windows mobile devices

like i send some msg or file from 1 mobile device to another mobile device

is it possible?

plz send me the source code if its exixt

thanks all
regards
ali

Re: bluetooth file transfer b/w to windows mobile

Peter_in_278018-Jul-12 20:24

Peter_in_2780

18-Jul-12 20:24

syedaliaizazuddin wrote:
plz send me the source code if its exixt

Point 2 of "How to get an answer to your question" just above says:
Don't ask "can someone send me the code to create an application that does 'X'.

So, do not expect an answer any day soon. Mad | :mad:

Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

Re: bluetooth file transfer b/w to windows mobile

syedaliaizazuddin18-Jul-12 23:34

syedaliaizazuddin

18-Jul-12 23:34

oh ok dear i dnt knw what policies are here...

Strange List<string[]> behaviour...

OlofBakker18-Jul-12 14:58

OlofBakker

18-Jul-12 14:58

Good morning,

I have been searching for a long time, until I nailed this behaviour:

public static void Test()
        {
            string[] strArray = { "", ""};
            List<string[]> strArrayList = new List<string[]>();

            strArray[0] = "A";
            strArrayList.Add(strArray);
            strArray[0] = "B";
            strArrayList.Add(strArray);
            strArray[0] = "C";
            strArrayList.Add(strArray);
            MessageBox.Show("strArrayList: " + strArrayList[0][0] + strArrayList[1][0] + strArrayList[2][0]);
            // I expect: "ABC", but it shows: "CCC"!

            string str = "";
            List<string> strList = new List<string>();
            str = "A";
            strList.Add(str);
            str = "B";
            strList.Add(str);
            str = "C";
            strList.Add(str);
            MessageBox.Show("strList: " + strList[0] + strList[1] + strList[2]);
            // I expect: "ABC", and it shows: "ABC"!
        }

When I change a string and then add it to a list, everything is fine. However, when I change a string in a string array and then add this array to a list, all previously stored arrays in the list are updated as well!

Is this normal or am I doing something wrong?
Of course, there is this ridiculous work-around "strArrayList.Add(strArray.ToList().ToArray());" Which works! Big Grin | :-D

Thanks in advance,

Olof

Re: Strange List behaviour...

ignrod18-Jul-12 15:25

ignrod

18-Jul-12 15:25

You have to take into account that strArray is a reference type. It seems that when you add it to strArrayList, a reference is added. Then, strArrayList contains a list of references to string arrays, which are the same array since you have been reusing the variable without reasignating it.
This is similar to what happens in the following case:

public void Test() {
	string[] a = new string[] {"", ""};
	string[] b = a;
	a[0] = "A";
	b[0] = "B";
	Console.WriteLine("{0} {1}", a[0], b[0]);
}

Re: Strange List behaviour...

OlofBakker19-Jul-12 0:14

OlofBakker

19-Jul-12 0:14

Thank you,

Olof

Programmable Rotators / Pivots - Do they exist?

Member 850513118-Jul-12 9:40

Member 8505131

18-Jul-12 9:40

Sorry for the lame title. But my questions is do programmable rotators exist? by rotator I means like a mechanized circle which I can attach something to it?

I can't really explain my self what it actually is ... imagine those cameras that are able to turn 180% something similar.

If you have any ideas of any brands can you please post a link I would really appreciate Smile | :)

Thanks.

Re: Programmable Rotators / Pivots - Do they exist?

Richard MacCutchan18-Jul-12 22:03

Richard MacCutchan

18-Jul-12 22:03

Member 8505131 wrote:
If you have any ideas of any brands

Questions like this are prime candidates for Google, they have little to do with C#.

One of these days I'm going to think of a really clever signature.

coloring label with timer

sisadosizdah18-Jul-12 8:51

sisadosizdah

18-Jul-12 8:51

namespace cheshmak
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
static int i;
static int x = 0;
string text = "Hello Welcome (^_^) ";

private void timer1_Tick(object sender, EventArgs e)
{
timer1.Interval = 111;
label1.Text = text;
switch (x)
{
case 0:
label1.ForeColor = Color.Red;
break;
case 1:
label1.ForeColor = Color.Yellow;
break;
case 2:
label1.ForeColor = Color.Red;
break;
}
if(++x > 1)
x = 0;
label1.Text = text.Substring(0,i+1);
i++;
if (i == text.Length)
{
timer1.Interval = 3000;
i = 0;
}
}

private void Form1_Load(object sender, EventArgs e)
{
this.CenterToScreen();
label1.FlatStyle = FlatStyle.Popup;
}
}

}

Re: coloring label with timer

Dave Kreskowiak18-Jul-12 8:54

Dave Kreskowiak

18-Jul-12 8:54

Was there a question in here or were you just posting code for the hell of it??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: coloring label with timer

DaveyM6918-Jul-12 8:59

DaveyM69

18-Jul-12 8:59

And what's the problem, except not reading this[^] and not posting a question?

Dave

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.
Astonish us. Be exceptional. (Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: coloring label with timer

Paul Conrad18-Jul-12 9:30

Paul Conrad

18-Jul-12 9:30

As the others have mentioned, is there a problem?

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Re: start the timer

Luc Pattyn18-Jul-12 10:48

Luc Pattyn

18-Jul-12 10:48

did you?

Luc Pattyn [My Articles] Nil Volentibus Arduum

hierarchical data in datagrid wpf(treegrid)

algoram18-Jul-12 5:43

algoram

18-Jul-12 5:43

Hi all,

I want to implement Nested Datagrid With Dynamic RowdetailsTemplate.The depth of RowDetailsTemplate can go to n levels.

Ex:

initially Datagrid ll contain 2 rows

Item1

Item2

and when Item1 is clicked another Datagrid with its child will appear say

Item1

Item1A

Item1B

Item2

when Item1A is Clicked another grid with its childs will appear

Item1

Item1A

Item1A1

Item1A2

Item1B

Item2

This tunnel can go to n levels.

How to achieve this with rowdetails template or else any other way

Thanks and regards,

karim

Re: hierarchical data in datagrid wpf(treegrid)

Dave Kreskowiak18-Jul-12 8:56

Dave Kreskowiak

18-Jul-12 8:56

You mean like this[^]?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Error 1 The modifier 'abstract' is not valid for this item

RaoulICT17-Jul-12 18:17

RaoulICT

17-Jul-12 18:17

I'm trying to build my C# project, I get the error:
The modifier 'abstract' is not valid for this item

Is the item: FieldChanged;

In the following Interface:

namespace program.Drawing.Fields
{
    using System;
    using System.Collections.Generic;
    using System.Runtime.CompilerServices;

    public interface IFieldHolder
    {
  abstract event FieldChangedEventHandler FieldChanged;

  void AddField(Field field);
  Field GetField(FieldType fieldType);
  List<Field> GetFields();
  bool HasField(FieldType fieldType);
  void RemoveField(Field field);
  void SetFieldValue(FieldType fieldType, object value);
    }
}

Re: Error 1 The modifier 'abstract' is not valid for this item

Trak4Net17-Jul-12 19:09

Trak4Net

17-Jul-12 19:09

Have a read at the link below

Quote:
•Abstract method declarations are only permitted in abstract classes.

Quote:
Interfaces and interface members are abstract;

http://msdn.microsoft.com/en-us/library/sf985hc5(v=vs.71).aspx[^]

and here

http://msdn.microsoft.com/en-us/library/ms173156.aspx[^]

Re: Error 1 The modifier 'abstract' is not valid for this item

RaoulICT17-Jul-12 19:26

RaoulICT

17-Jul-12 19:26

Can you gave me a fix in my code

Re: Error 1 The modifier 'abstract' is not valid for this item

Trak4Net17-Jul-12 19:31

Trak4Net

17-Jul-12 19:31

You just need to remove the abstract declaration for the event.

namespace program.Drawing.Fields
{
    using System;
    using System.Collections.Generic;
    using System.Runtime.CompilerServices;
 
    public interface IFieldHolder
    {
      event FieldChangedEventHandler FieldChanged;
 
      void AddField(Field field);
      Field GetField(FieldType fieldType);
      List<Field> GetFields();
      bool HasField(FieldType fieldType);
      void RemoveField(Field field);
      void SetFieldValue(FieldType fieldType, object value);
    }
}

Re: Error 1 The modifier 'abstract' is not valid for this item

BobJanova18-Jul-12 3:46

BobJanova

18-Jul-12 3:46

Just to expand slightly on the (correct) fix already posted: You can't put 'public' or 'abstract' on interface members, because by definition they are already public and abstract, so to prevent confusion* no access modifiers are permitted.

*: or that's what the rationale is, anyway. I think it's silly, it prevents future expansion and the fact that the default scope (public abstract) in an interface is different from that (private) in a class is more confusing than making you write 'public abstract' on things in interfaces.

Re: Error 1 The modifier 'abstract' is not valid for this item

PIEBALDconsult18-Jul-12 4:22

PIEBALDconsult

18-Jul-12 4:22

I think it makes sense that everything in an Interface is public and abstract by definition, but I don't like default modifiers on class members.

Re: Error 1 The modifier 'abstract' is not valid for this item

Luc Pattyn18-Jul-12 6:49

Luc Pattyn

18-Jul-12 6:49

Luc Pattyn [My Articles] Nil Volentibus Arduum

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