help with strange bug re Activator.CreateInstance - C# Discussion Boards

ruanr10-Jul-07 22:47

10-Jul-07 22:47

Hi,

I'm starting to read up on serializing my classes using XML, seems really useful but depending on which article I read opinions vary on whether ArrayLists can be serialized. Does anyone know for sure whether they can or can not? It seems as though it changed from 1.1 to 2.0, but I cant tell for sure.

Thanks

Re: XML Serialize

WillemM11-Jul-07 0:33

WillemM

11-Jul-07 0:33

It has changed from .NET 1.1 to .NET 2.0, as far as I know you can serialize List<T> in .NET 2.0
Another method is the mark the list with the [XmlElement] attribute, to make sure it gets serialized correctly.

WM.

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text editor

Sebastian T Xavier10-Jul-07 22:35

Sebastian T Xavier

10-Jul-07 22:35

Hi,

i am developing a text editor for windows forms in c#. i would like to know how to add bullets and numbering. I have added the following code.

<br />
rtbDoc.BulletIndent = 10;<br />
rtbDoc.SelectionBullet = true;<br />

but it gives only 1 type(circle) of bullets. But i have to show square type bullets and numbering...
will you please give some guidelines...

Thanks in adavnce

Sebastian

Re: text editor

Colin Angus Mackay10-Jul-07 23:32

Colin Angus Mackay

10-Jul-07 23:32

Sebastian T Xavier wrote:
i am developing a text editor for windows forms in c#.

Looks to me as if you are just using the RichTextBox. That isn't "developing a text editor". Someone else has already developed it, you are just putting it in a form.

Sebastian T Xavier wrote:
but it gives only 1 type(circle) of bullets. But i have to show square type bullets and numbering...
will you please give some guidelines...

If you were genuinely "developing a text editor" you would be able to do what ever you wanted. So, actually do what you say you are doing.

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Re: text editor

Luc Pattyn10-Jul-07 23:34

Luc Pattyn

10-Jul-07 23:34

AFAIK there is only one bullet style in RTB.

Smile | :)

Luc Pattyn

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Re: text editor

Sebastian T Xavier11-Jul-07 1:13

Sebastian T Xavier

11-Jul-07 1:13

Thank you

Sebastian

Re: text editor

mav.northwind11-Jul-07 8:45

mav.northwind

11-Jul-07 8:45

Hi!
The RichTextBox actually can do a lot more than you can access with the built-in methods and properties.
Underneath the .NET wrapper there's a RichEdit control (version 2) you can send windows messages to (read about rich edit control messages in MSDN) to achieve several nice effects like different kinds of numbering, underline styles, superscript/subscript and several others.

Regards,
mav

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help with strange bug re Activator.CreateInstance

s0ren10-Jul-07 21:54

s0ren

10-Jul-07 21:54

Hello all,

I'm very frustrated with a bug that I can't seem to beat. I'm using Activator.CreateInstance to create an array of objects based on a sampleObject. Each instance of SampleObject contains a uniqueid which is generated randomly in the constructor. Something like this:

<br />
SampleObject sampleObject = new SampleObject();<br />
SampleObject[] array;<br />
<br />
<cut other stuff><br />
for (int i = 0; i < numberToCreate;i ++)<br />
   array[i] = Activator.CreateInstance(sampleObject.GetType());<br />
<br />
<cut rest of code><br />

Now, when I run this in the VS debugger it works fine and I get a proper batch of unique objects. However, when I run the code outside of VS, all the objects have the same uniqueid!

Anyone out there have any idea what is going wrong or more importantly how to fix it Confused | :confused:

TIA

Re: help with strange bug re Activator.CreateInstance

Vikram A Punathambekar10-Jul-07 22:10

Vikram A Punathambekar

10-Jul-07 22:10

I tried something like this, and it worked perfectly. My thoughts:
1. Are you sure you're running the same code outside of VS? Maybe what you're running from outside is an older build.
2. You haven't shown us the ctor logic. When the ID is generated in the constructor, try printing it or logging it to a file, for debugging purposes.
3. Aggressive compiler optimization settings may be interfering with your program logic. Try running it without optimizations.

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

Re: help with strange bug re Activator.CreateInstance

s0ren10-Jul-07 22:18

s0ren

10-Jul-07 22:18

Hello Vikram,

Thanks for responding. I have verified that I am not running the latest build, etc. I also tried with optimisation disabled.

Here is my Constructor:

public class MyDerivedObject : MyBaseObject
{
public static int NUMBER_OF_DIMENSIONS = 2;

double uniqueID;

public MyDerivedObject() : base(NUMBER_OF_DIMENSIONS)
{
uniqueID = base.RandomGenerator.NextDouble(); // generate uniqueID
Console.WriteLine("uiqueID: " + uniqueID.ToString());
}
}

Thanks again

Re: help with strange bug re Activator.CreateInstance

Vikram A Punathambekar10-Jul-07 22:25

Vikram A Punathambekar

10-Jul-07 22:25

Just a hunch, but the problem could be with RandomGenerator. Maybe you're making the same mistake as I was here[^] Smile | :)

Did you try the logging part? Another angle for you: just for debugging, insert a

Thread.Sleep(500);

as the last line of your MyDerivedObject's constructor.

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

Re: help with strange bug re Activator.CreateInstance [solved]

s0ren10-Jul-07 22:37

s0ren

10-Jul-07 22:37

Thank you Vikram! I'm not sure WHY it fixed the problem, but making the RandomGenerator static as suggested in the link you provided did the trick!

Many many thanks to you!

Re: help with strange bug re Activator.CreateInstance [solved]

Vikram A Punathambekar10-Jul-07 22:47

Vikram A Punathambekar

10-Jul-07 22:47

s0ren wrote:
I'm not sure WHY it fixed the problem

That way, it only gets initialized once. If you create a random number generator inside the method, it is likely that the execution is so fast it gets seeded with the same value and generates the same 'random' numbers.

s0ren wrote:
Many many thanks to you!

You're welcome; I'm glad I could help somebody. Smile | :)

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

ArrayList -> SortedList -> SortedList. Right ?

Saikek10-Jul-07 21:49

Saikek

10-Jul-07 21:49

Hello everyone!
I need to store such data:
Partitions(ex: english), Authors(ex: Shakespeare), Books(ex:Otello).
Ierarchy is Partitions->Authors->Books.
What is the best way to store data ?
I used a ArrayList -> SortedList -> SortedList and serialization.
I don't want to use SQL, because it cannot be installed on each computer, where this program will be used.

One nation - underground

Re: ArrayList -> SortedList -> SortedList. Right ?

Vikram A Punathambekar10-Jul-07 21:57

Vikram A Punathambekar

10-Jul-07 21:57

For storing it, I would recommend XML. For displaying it, you can go for a TreeView.

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

What do you mean ?

Saikek10-Jul-07 22:04

Saikek

10-Jul-07 22:04

Do you mean XML, you mean serialization ? What kind of structure should i use?
Is isn't it wery expensive to use a->s->s->? The number of elements won't exceed 1000.

One nation - underground

Re: What do you mean ?

Vikram A Punathambekar10-Jul-07 22:19

Vikram A Punathambekar

10-Jul-07 22:19

Dude, I thought your data looked something like this

English
	Twain
		Tom Sawyer
		Huck Finn
	Orczy
		The Scarlet Pimpernel
	Dawkins
		The God Delusion
		The Selfish Gene
Hindi
	Premchand
		Panch Parmeshwar

XML is the best way to store this.

<yourRootTag>
	<language name="English">
		<author name="Twain">
			<title>Tom Sawyer</title>
			<title>Huck Finn</title>
		</author>
		Other authors go here...
	</language>
	Other languages go here...
</yourRootTag>

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

Re: What do you mean ?

Saikek10-Jul-07 22:28

Saikek

10-Jul-07 22:28

Thanks for help. Can You tell me where can i read about this way of xml ? Read all Xml related articles ?

One nation - underground

Re: What do you mean ?

Vikram A Punathambekar10-Jul-07 22:33

Vikram A Punathambekar

10-Jul-07 22:33

Saikek wrote:
Can You tell me where can i read about this way of xml ?

Here?[^]

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

Re: What do you mean ?

J4amieC11-Jul-07 0:17

J4amieC

11-Jul-07 0:17

You forgot Here[^]

---

How to get answers to your questions[^]

Re: What do you mean ?

Sathesh Sakthivel11-Jul-07 0:21

Sathesh Sakthivel

11-Jul-07 0:21

Regards,

Satips. Rose | [Rose]

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Don't walk behind me, I may not lead;
Walk beside me, and just be my friend. - Albert Camus

How to hold up some key on the keyset?

jason_mf10-Jul-07 21:45

jason_mf

10-Jul-07 21:45

I just want to numeral.So I want to hold up any keys except numeral keys.
But I must not use NumericUpDown Control.
My code snippet:
switch (e.KeyCode)
{
case Keys.D0:
case Keys.D1:
case Keys.D2:
case Keys.D3:
case Keys.D4:
case Keys.D5:
case Keys.D6:
case Keys.D7:
case Keys.D8:
case Keys.D9:
case Keys.NumPad0:
case Keys.NumPad1:
case Keys.NumPad2:
case Keys.NumPad3:
case Keys.NumPad4:
case Keys.NumPad5:
case Keys.NumPad6:
case Keys.NumPad7:
case Keys.NumPad8:
case Keys.NumPad9:
break;
case Keys.Enter:
this.btnOK.Focus();
break;
default:
//hold up
break;
}

I do not know how write code at default.
please give me directions or other scheme ,thanks.

Re: How to hold up some key on the keyset?

Martin#10-Jul-07 22:09

Martin#

10-Jul-07 22:09

Hello,

I assume that you are handling the KeyDown event, and you whant to prevent non numerical inputs!
Then you have to set:

e.Handled = true;

Hope it helps!

All the best,

Martin

Re: How to hold up some key on the keyset?

jason_mf10-Jul-07 22:49

jason_mf

10-Jul-07 22:49

I writed
"e.Handled = true"
But it is noneffective.
it is anticly.

Re: How to hold up some key on the keyset?

Martin#10-Jul-07 23:32

Martin#

10-Jul-07 23:32

Hello,

jason_mf wrote:
But it is noneffective.

YEs, sorry you also have to handle KeyPress!

But what I would recommend is inheriting your own NumericTextBox from TextBox.

public class NumericTextBox : System.Windows.Forms.TextBox
{

And override OnKeyPressed and OnKeyDown:

bool keydownHandled; //Flag from OnKeyDown, cause it's easier to validate there

protected override void OnKeyDown(System.Windows.Forms.KeyEventArgs e)
{
    switch (e.KeyCode)
    {
        case Keys.D0:
        case Keys.D1:
        case Keys.D2:
        case Keys.D3:
        case Keys.D4:
        case Keys.D5:
        case Keys.D6:
        case Keys.D7:
        case Keys.D8:
        case Keys.D9:
        case Keys.NumPad0:
        case Keys.NumPad1:
        case Keys.NumPad2:
        case Keys.NumPad3:
        case Keys.NumPad4:
        case Keys.NumPad5:
        case Keys.NumPad6:
        case Keys.NumPad7:
        case Keys.NumPad8:
        case Keys.NumPad9:
        case Keys.Enter:
            break;
        default:
            e.Handled = true;
            break;
    }
    keydownHandled = e.Handled;
    base.OnKeyDown (e);
}

protected override void OnKeyPress(KeyPressEventArgs e)
{
    e.Handled = keydownHandled;  //flag from OnKeyDown
    base.OnKeyPress (e);
}

For the ENTER Key you can do the handling of KeyDown directly on the Form.

Hope it helps!

P.S.: Don't forget to care about "copy/paste"

All the best,

Martin

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