Re: Designer - Components - Properties only visible in derived classes - C# Discussion Boards

Re: Facing problem while calling FOR EACH st. in vb from C# DLL

Colin Angus Mackay23-Aug-04 2:24

23-Aug-04 2:24

Ami Shah wrote:
am iterating the items from Visual basic but it is giving error like Object does not support this property or method while it works fine with .net.

Do you mean Visual Basic 6? I wouldn't think that a class written with C# would work in VB6 without a lot of extra work (I believe it is possible via COM, but it takes a lot to achieve it)

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Re: Facing problem while calling FOR EACH st. in vb from C# DLL

Ami Shah23-Aug-04 2:37

Ami Shah

23-Aug-04 2:37

Ya, Visual Basic 6 only. It is mentioned in the given URL also that you can use For Each statement in Visual Basic 6 also with using Example code 2.
I have implemented the same code given in Example 2 only and Calling loop thru VB as mentioned. It should work acoording to article, right?

Re: Facing problem while calling FOR EACH st. in vb from C# DLL

Colin Angus Mackay23-Aug-04 3:19

Colin Angus Mackay

23-Aug-04 3:19

I wouldn't think that is possible. You need to be using VB.NET

I understand that is possible to access .NET objects in a non .NET environment via a COM interface, but I've never tried. However, that solution will not give you access to the enumerator via a foreach statement, you would use the via the methods exposed via the IEnumerable interfave directly.

Re: Facing problem while calling FOR EACH st. in vb from C# DLL

Ami Shah23-Aug-04 3:34

Ami Shah

23-Aug-04 3:34

See the URL, in the example 2 it is clearly written that
"This example repeats the same algorithm of Example 1, but uses a generic collection that can be enumerated from other languages such as Visual Basic."
I think the meaning is that We can use the for each and iterate thru collection from visual basic.

Re: Facing problem while calling FOR EACH st. in vb from C# DLL

Colin Angus Mackay23-Aug-04 4:03

Colin Angus Mackay

23-Aug-04 4:03

Given the context of the article, they are meaning Visual Basic.NET. By "other languages" it looks to me that they mean other languages that use the .NET framework.

Re: Facing problem while calling FOR EACH st. in vb from C# DLL

leppie23-Aug-04 4:02

leppie

23-Aug-04 4:02

Try the VB forums, they might not laugh as loud as I am Laugh | :laugh:

^{top secret xacc-ide 0.0.1}

Designer - Components - Properties only visible in derived classes

STW23-Aug-04 1:45

STW

23-Aug-04 1:45

I've made an Interface IDataFactory with a property ISqlDbComponent{get;set;}

a component with the interface IDataFactory:

public class DataFactory : System.ComponentModel.Component, IDataFactory

The property should be visible with

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

but isn't.

When I derive a component from DataFactory, the property ISqlDbComponent IS visible.

I don't understand why and which Designer Attribute I have to add to the property to make it visible in the first implementation and not only in derived classes.
The property is implemented in the component "DataFactory" so why it isn't visible in the designer?

Thanks a lot

Stefan

Re: Designer - Components - Properties only visible in derived classes

leppie23-Aug-04 4:00

leppie

23-Aug-04 4:00

STW wrote:
The property should be visible with

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

but isn't.

Thats not true. That controls what the designer 'saves', and that attribute means it will be saved.

Look at BrowsableAttribute, but public Properties are visible by default.

^{top secret xacc-ide 0.0.1}

Re: Designer - Components - Properties only visible in derived classes

STW23-Aug-04 6:26

STW

23-Aug-04 6:26

Thanks for reply.
Yes, right.
I forgot to mention that I set [Browsable(true)] for the property.
Is there anything else?

Stefan

C# Delete and Write specific data in a text file???

gman4423-Aug-04 1:07

gman44

23-Aug-04 1:07

I'm inserting data into a text log file. I need to delete only certain lines of data, generally from line 50 to the end (EOF). I then need to write data to the same file starting at line 50.

Q. How do I delete certain lines of data???

Q. How do I delete from a certain line of data the EOF???

Q. How do I start writing at a specific line???

Re: C# Delete and Write specific data in a text file???

leppie23-Aug-04 3:57

leppie

23-Aug-04 3:57

1. read each line into an arraylist, then delete the lines u dont need, then write to file again.
2. there is only one EOF and thats at the end-of-file.
3. see 1

^{top secret xacc-ide 0.0.1}

howto add control dynamicaly

Stephan Wright22-Aug-04 23:56

Stephan Wright

22-Aug-04 23:56

Hy everyone!

I designed a windows Form which contains a control by default.
Now I do want to add another control depending on the data, meaning if the data contains ínfos which have to be displayed in the control then the control should be inserted, the Form size is changed etc. (if the length where the data is stored is not 0)

I managed to check if the data needs the second form and I changed the Forms size, but at the moment I am not sure how to insert the second control dynamicaly. I can't just throw it in like I did with the otherone and let the code being insert automaticaly.

So I do want to do something like

if(data.secondform.length!=0)<br />
{<br />
  resize Form<br />
  insert second control<br />
  display data in the control<br />
}

the other way round shouldn't be the problem meaning removing the control again when I do get data which is not asking for the control.

Could anyone of you please tell me what I do have to do to insert the control in my Forms windows? (maybe with some code statements)

Thanks!
Stephan.

Re: howto add control dynamicaly

S Sansanwal23-Aug-04 0:20

S Sansanwal

23-Aug-04 0:20

check
http://support.microsoft.com/default.aspx?scid=kb;EN-US;319266

Sanjay Sansanwal
www.sansanwal.com

Re: howto add control dynamicaly

Stephan Wright23-Aug-04 0:39

Stephan Wright

23-Aug-04 0:39

is this the same for Windows.Controls?
Meaning could I use the button for example as a sample for my task?

Thanks!
Stephan.

Re: howto add control dynamicaly

Nick Parker23-Aug-04 4:07

Nick Parker

23-Aug-04 4:07

The Form class in System.Windows.Forms namespace contains a Controls property which is a collection of controls. It has methods to add and remove controls, among others. Check it out on MSDN.

- Nick Parker
My Blog | My Articles

Re: howto add control dynamicaly

LongRange.Shooter23-Aug-04 7:37

LongRange.Shooter

23-Aug-04 7:37

Here is one possible approach:

in start of program:

object Item = GetData();
...cast Item to specific type...

in your data component:

public object GetData()
{
  ...read the data and determine the different types of data
  ...now cast that data to the specific type of data
  ...and return that type-specific object
}

public class DataTypeOne
{ .. what makes this unique .. }
public class DataTypeTwo
{ .. what makes this unique .. }

in your form

InitializeComponents();  // look familiar?
LoadForm(TypeSpecificItem);
...
public void LoadForm(DataTypeOne item)
{
  DataOneForm form = new DataOneForm(item);
  this.Components.Add(form);
}
public void LoadForm(DataTypeTwo item)
{
   DataTwoForm form = new DataTwoForm(item);
   this.Components.Add(form);
}
.... overload for each object type ....

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How to control IE6

pmasknguyen22-Aug-04 22:02

pmasknguyen

22-Aug-04 22:02

How i write a program. It can control IE6 like back,home, choose a specify link in website. Do you some information to develop it

Nothing

Re: How to control IE6

David Salter22-Aug-04 22:19

David Salter

22-Aug-04 22:19

Have a look at

http://www.codeproject.com/csharp/webbrowser.asp

store your internet favourites online - www.my-faves.co.uk

Clickety

Colin Angus Mackay22-Aug-04 22:41

Colin Angus Mackay

22-Aug-04 22:41

http://www.codeproject.com/csharp/webbrowser.asp[^]

Re: Clickety

David Salter22-Aug-04 23:30

David Salter

22-Aug-04 23:30

Sorry, I posted that comment from Mozilla and for some reason I don't get the Clickety option in that.

store your internet favourites online - www.my-faves.co.uk

Best way to calculate hash

Radoslav Bielik22-Aug-04 21:28

Radoslav Bielik

22-Aug-04 21:28

Hi everyone,

Which is the better way to calculate hash of a simple string, should I use MD5CryptoServiceProvider or is it OK to use this static method: FormsAuthentication.HashPasswordForStoringInConfigFile?

Please note that it will only be used in an ASP.NET server control. I know the latter method has been designed for a different purpose, but it does exactly what I need in a simple and straightforward way (just 1 line of code), so I was wondering if this would be correct or more efficient or if I should rather use CryptoServiceProvider approach?

Also, with CryptoServiceProvider, is there a simple way of converting a byte array into a hexadecimal string represenatation (I mean simpler than iterating through the array and appending hexadecimal represenatation of each byte to the end of the string)?

Thanks in advance for any ideas,
Rado

Radoslav Bielik
http://www.neomyz.com/poll [^] - Get your own web poll

Re: Best way to calculate hash

Jonathan de Halleux22-Aug-04 23:19

Jonathan de Halleux

22-Aug-04 23:19

Radoslav Bielik wrote:
Also, with CryptoServiceProvider, is there a simple way of converting a byte array into a hexadecimal string represenatation

byte[] bits = ...;
string hash = System.Text.Encoding.Default.ToString(bits);

Jonathan de Halleux - My Blog

Re: Best way to calculate hash

Radoslav Bielik22-Aug-04 23:37

Radoslav Bielik

22-Aug-04 23:37

That would be actually very nice, but I'm not sure I get it right or if I'm doing something wrong. The ToString() method of Encoding class doesn't take any input arguments. There is the GetString(byte[] ...) method, but it will return a string representation of the bytes in the byte array, not a hexadecimal representation (like "7ba183d2") which is what I'm trying to do.

And finally, there is also the BitConverter class with its ToString(byte[] ...) method which works, but it will return a string where octets are separated by dashes.

Rado

Radoslav Bielik
http://www.neomyz.com/poll [^] - Get your own web poll

Re: Best way to calculate hash

Jonathan de Halleux22-Aug-04 23:48

Jonathan de Halleux

22-Aug-04 23:48

Sorry, ToString was GetString indeed. I though you just needed to convert a byte[] to string. Do you really need hex representation ? you can convert to Base64.

Jonathan de Halleux - My Blog

Re: Best way to calculate hash

Radoslav Bielik23-Aug-04 0:01

Radoslav Bielik

23-Aug-04 0:01

Jonathan de Halleux wrote:
Sorry, ToString was GetString indeed. I though you just needed to convert a byte[] to string. Do you really need hex representation ?

Yes, I should have made that more obvious Blush | :O

Thank you for your response anyway!

Rado

Radoslav Bielik
http://www.neomyz.com/poll [^] - Get your own web poll

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