C# Discussion Boards - CodeProject

Re: Using a keyword as an enum identifier

Vikram A Punathambekar3-Jun-08 2:52

3-Jun-08 2:52

In addition to what Colin said, I would almost never recommend it. It's bad practice, and it throws people off the track. Not many people even know about this. IMO, this feature should have been left out.

Cheers,
Vikram.

The hands that help are holier than the lips that pray.

Re: Using a keyword as an enum identifier

Dan Neely3-Jun-08 3:43

Dan Neely

3-Jun-08 3:43

I agree that it's dangerous, but since C# keywords != VB keywords != C++ keywords != python keywords != cobol keywords, etc; the CLR needs to have a way to handle something not a keyword in the language it was written in but that is one in a different language that wasn't considered when the class was originally written.

You know, every time I tried to win a bar-bet about being able to count to 1000 using my fingers I always got punched out when I reached 4....
-- El Corazon

Re: Using a keyword as an enum identifier

Vikram A Punathambekar3-Jun-08 4:01

Vikram A Punathambekar

3-Jun-08 4:01

Excellent, thanks. I stand corrected on the "This feature should have been left out" bit. Smile | :)

Cheers,
Vikram.

The hands that help are holier than the lips that pray.

Re: Using a keyword as an enum identifier

Scott Dorman3-Jun-08 3:00

Scott Dorman

3-Jun-08 3:00

Both Colin and Vikram are correct. It is possible to do by prefixing the enum field with the "@" symbol but it really is not recommended.

Scott.

—In just two days, tomorrow will be yesterday.
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Class Libraries (DLL Files)

Ian Uy3-Jun-08 2:39

Ian Uy

3-Jun-08 2:39

Good Day,

Ever since I've used DLL files, I'm always plagued by the problem of detecting whether they exist or not.

For example, A.exe uses A.dll , and then I delete A.dll then run A.exe

A.exe will run successfully even if A.dll does not exist, it will however crash when some function from A.dll was called.

Is it possible to display "Cannot find A.dll. Application will now close." message?

I don't want to use File.Exist("A.dll") in Program.cs, is there any other way to accomplish the task?

Thanks!

It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.

Re: Class Libraries (DLL Files)

Colin Angus Mackay3-Jun-08 2:42

Colin Angus Mackay

3-Jun-08 2:42

If the DLL is optional, you could catch the exception that is thrown when the DLL is not present.

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Re: Class Libraries (DLL Files)

Ian Uy3-Jun-08 2:44

Ian Uy

3-Jun-08 2:44

Thanks for the reply.

What if the DLL is really really needed? And I want to throw an exception before the main form starts (in program.cs)?

Re: Class Libraries (DLL Files)

Vikram A Punathambekar3-Jun-08 2:55

Vikram A Punathambekar

3-Jun-08 2:55

Ian Uy wrote:
What if the DLL is really really needed?

I thought your situation was that the DLL already is NOT there! Confused | :confused:

Ian Uy wrote:
And I want to throw an exception before the main form starts (in program.cs)?

You could try loading all the DLLs you need at the beginning using Assembly.Load(), I suppose....

Cheers,
Vikram.

The hands that help are holier than the lips that pray.

Re: Class Libraries (DLL Files)

Ian Uy3-Jun-08 2:57

Ian Uy

3-Jun-08 2:57

Vikram A Punathambekar wrote:

You could try loading all the DLLs you need at the beginning using Assembly.Load(), I suppose....

Yup, after searching Google, I stumbled upon this solution. I am using Assembly.LoadFrom inside a try-catch block. Smile | :)

Thanks!

WSUS API Publishing Local Updates

freakno13-Jun-08 2:37

freakno1

3-Jun-08 2:37

Hi has anyone everbeen able to publish updates to wsus / 3 ?

There is an API but I haven't been able to find any good/usefull documentation/instructions .

I think this will be a usefull article if anybody knows how it works .

Viewing Image field in Crystal Report Properly

Muhammad Gouda3-Jun-08 0:54

Muhammad Gouda

3-Jun-08 0:54

I am connecting to an MS Access Database with one of the tables containing an image field (OLE)
When I created a report that display that image, I faced 2 problems:
1- The resolution of the image turned very bad. So, how to control this?
2- How to adjust the image size to dynamically display proportional height and width that fit on A4 paper?

Mohammed Gouda
foreach(Minute m in MyLife)
myExperience++;

Re: Viewing Image field in Crystal Report Properly

Muhammad Gouda3-Jun-08 2:48

Muhammad Gouda

3-Jun-08 2:48

Attention Here .. Please

Mohammed Gouda
foreach(Minute m in MyLife)
myExperience++;

Re: Viewing Image field in Crystal Report Properly

Muhammad Gouda3-Jun-08 3:43

Muhammad Gouda

3-Jun-08 3:43

Mohammed Gouda
foreach(Minute m in MyLife)
myExperience++;

Views

ellllllllie3-Jun-08 0:24

ellllllllie

3-Jun-08 0:24

Hello,
in an application developped via ASP. if i run a table it take about 1 seconde to get the result.
but running the view of the corresponding table take about 3s.
Note : the view contain a complexe query.
So from where to get data from table or view in order to optimize my search.
best regards

dghdfghdfghdfghdgh

Re: Views

leppie3-Jun-08 0:57

leppie

3-Jun-08 0:57

Show us your C# code.

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Re: Views

Ashfield3-Jun-08 1:28

Ashfield

3-Jun-08 1:28

Its your choice really. If the table contains all the data you need and its quicker, use it. If not, use the view.

The only real way to tell is to benchmark the time it takes to do whatever you need to do with the data.

Bob
Ashfield Consultants Ltd

replace method

kamalesh57433-Jun-08 0:02

kamalesh5743

3-Jun-08 0:02

Hi all,
i got problem in replacing text in richtextbox with new text.
I using find and replace method,but it doesnt work..

The text will load in richtextbox when i run the system.Wht i need is just replace some text with new text in richtextbox..
Pls help me..

Thank You..

%#&kmpYrlHSGYG5@#($_+!@!(*JASnjshdk,cm_0ashjhdbn@#$!48mkhfbchsh))^%#W%&@YW7wsdfjw789';'][]\`~JKJQ4$!@#~)-HSKS^&*1)JK12@#@$~!1`DFGkqp][]\]?Zas;EWRG%!@~)(^&BVAG

Re: replace method

leppie3-Jun-08 0:58

leppie

3-Jun-08 0:58

And what is not working? What do you use to find and then replace? Show some code.

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Re: replace method

kamalesh57433-Jun-08 1:32

kamalesh5743

3-Jun-08 1:32

the code i did is like this,

richTextBox1.Find("XX");
richTextBox1.SelectedText = text.Replace("XX", text);

The string "XX" is i load into richtextbox.Then i open external file to replace this "XX" with some text.
The code i did is doesnt work.So got any other way to find solution for this case.

Thank You.

%#&kmpYrlHSGYG5@#($_+!@!(*JASnjshdk,cm_0ashjhdbn@#$!48mkhfbchsh))^%#W%&@YW7wsdfjw789';'][]\`~JKJQ4$!@#~)-HSKS^&*1)JK12@#@$~!1`DFGkqp][]\]?Zas;EWRG%!@~)(^&BVAG

Re: replace method

leppie3-Jun-08 1:42

leppie

3-Jun-08 1:42

kamalesh5743 wrote:
richTextBox1.Find("XX");
richTextBox1.SelectedText = text.Replace("XX", text);

Try:

richTextBox1.Find("XX");
richTextBox1.Text = richTextBox1.Text.Replace("XX", text);

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

Multicast Delegates and effect in C++ COM Server

dtranter2-Jun-08 23:45

dtranter

2-Jun-08 23:45

Hello

I am using multicast delegate as follows, but the effect in the server is undesirable:

Thing.OnEvent1 += new IThingEvents_OnEvent1EventHandler(OnEvent1);
Thing.OnEvent2 += new IThingEvents_OnEvent2EventHandler(OnEvent2);
Thing.OnEvent3 += new IThingEvents_OnEvent3EventHandler(OnEvent3);

The problem is that the (C++ COM) server it thinks it has all the connections for each event.
So in the below example it trys to send the event 3 times. Apart from the unecessary processing, I am worried it is making the inter-process call each time (the incorrect calls are being thrown away on the client side somewhere).

HRESULT Fire_OnOrderCancel(lots of params)
{
HRESULT hr = S_OK;
T * pThis = static_cast<t*>(this);
int cConnections = m_vec.GetSize();

for (int iConnection = 0; iConnection < cConnections; iConnection++)
{
pThis->Lock();
CComPtr<iunknown> punkConnection = m_vec.GetAt(iConnection);
pThis->Unlock();

IDispatch * pConnection = static_cast<idispatch*>(punkConnection.p);

if (pConnection)
{
CComVariant avarParams[20];
//set avarParams
CComVariant varResult;

DISPPARAMS params = { avarParams, NULL, 9, 0 };
hr = pConnection->Invoke(1, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, ¶ms, &varResult, NULL, NULL);
}
}
return hr;
}

What c# thing do I need to use to get the desired behaviour, namely events to be fired once and the c# client to do the correct delegation?

Many Thanks

deds

iTextSharp : Select an item in a combobox in PDF file

fady_sayegh2-Jun-08 23:33

fady_sayegh

2-Jun-08 23:33

Hi to all,

I'm using the dll iTextSharp to fill a PDF file.
My question is how can i select an item in a combobox in the PDF file ?

Best regards and thanks in advance

Fady Sayegh

Casting to inhering type from inherited type

livez2-Jun-08 23:28

livez

2-Jun-08 23:28

Hey!

I got a problem with a class of mine inheriting from xmldocument. When I have an actual xmldocument I can´t cast it to my class, I get System.InvalidCastException. Why is this? I have done the same with for instance another class inheriting from UriBuilder.

Re: Casting to inhering type from inherited type

leppie2-Jun-08 23:37

leppie

2-Jun-08 23:37

livez wrote:
When I have an actual xmldocument I can´t cast it to my class, I get System.InvalidCastException. Why is this?

Because the instance you are trying to cast is obviously not of your inherited type!

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Re: Casting to inhering type from inherited type

livez3-Jun-08 0:32

livez

3-Jun-08 0:32

This is what I tried:

class test : XmlDocument
   {
       public test()
       {

       }

       public void testing ()
       {
           test t = new test();
           XmlDocument doc = new XmlDocument();
           t = (test)doc;
       }
   }

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