C# Discussion Boards - CodeProject

3-Jan-17 21:58

I have a class called Cls_Common.cs which contains a structure called St_Common where I declare the global variables that are common to all .cs files. I use it in Functions, compiled classes .dlls and in Mains.

I create a compiled .dll class to encrypt using these functions and the global structure of Cls_Common.cs.

When i add by reference the compiled class .dll to a Main, in the compile it generates in Visual Studio, there are actually two versions of the file Cls_Common.cs. When doing =new of the global structure, an ambiguity error occurs but execution continues and when an attempt to assign or retrieve a global structure value, occurs an error exception.

Issue:
In order to compile the Cls_Encrypt.dll class I need to include Cls_Common.cs to use common functions. At Main that includes by reference Cls_Encrypt.dll I also need to include Cls_Common.cs and that produces ambiguity.

According to Microsoft's brief solution to error CS0433, you have to compile from the command line with /reference and use an alias:
: https://msdn.microsoft.com/es-es/library/64wh5743.aspx
// compile with: /reference:cs0433_1.dll /reference:TypeBindConflicts=cs0433_2.dll

using TypeBindConflicts;  
public class Test   
{  
   public static void Main()   
   {  
      AggPubImpAggPubImp n6 = new AggPubImpAggPubImp();  
   }  
}

My Program:
==========

Cls_Common.cs:
----------------

namespace Name_Common
{
    public struct St_Common
    {   
       public string Languaje;
    }

    public static partial class Cls_Common
    {   // I define the structure so that there is no error in compiling.
        public static Name_Common.St_Common StCommon;
    }
}

Class compiled in an assembly called Cls_Encrypt.dll This class uses in Mains adding it as reference. Used to encrypt. Inside the class, calls are made to functions such as Func1.cs, Func2.cs ... That use the global variable structure Name_Common.Cls_Common.StCommon

Cls_Encrypt.cs:

---------------
public class Cls_Encrypt
{
    public Cls_Encrypt()  // Constructor.
    {  // Example line:
       if (Name_Common.Cls_Common.StCommon.Languaje == "Eng") ... 
    }
}

Main where I added as reference to compiled class Cls_Encrypt.dll

Main.cs
-----------

namespace Name_Main
{
    public Cls_Main() 
    {
       // At this line, no error event occurs. But if in the debugger I query by Name_Common.Cls_Common.StCommon, it appears:
       // Name_Common.Cls_Common.StCommon error CS0433: type 'Cls_Common' exists in 'Cls_Encrypt, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' and in 'Main, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'

       Name_Common.Cls_Common.StCommon = new Name_Common.St_Common();

       // The execution continues, but in the line:
       string MyVar = Name_Common.Cls_Common.StCommon.Languaje;

       // The exception occurs:
       // + ErrorExcp {"Object reference not set to an instance of an object."} System.Exception {System.NullReferenceException} HResult -2147467261
    }
}

The solution of Microsoft does not serve me because I have to leave Visual Studio to compile from the command line every time I make a change and the solution serves in the main but the functions do not refer to the alias. The solution seems like a fix.

It does not help me to pass by reference the global structure from the main to .dll because to compile the .dll I need to reference the type of the global structure of Cls_Common.cs. In addition, I would need to go through many structures because the .cs functions
are many and require new and different variables. Need global structures, not references.

I ask this:
1.- How can I use a single copy of a global structure in a compiled class .dll and in a main.
2.- When I use the Visual Studio debugger, if the form is large I can not see the code below. How to hide the form?
3.- I have read that I can stop the execution in the debugger (F9) and that I can press Interrupt, Modify a line and Continue. But he will not let me interrupt. How is made? Because now I have to stop the execution and start again.

I do not understand how this problem occurred when it is logical to use a global structure in Main, Functions and .dlls

Thank you.

modified 4-Jan-17 12:56pm.

Richard MacCutchan3-Jan-17 23:32

3-Jan-17 23:32

Including the same file in different parts of the application will always cause this. Your main program should only use the common methods from the DLL, not include the entire file.

zequion4-Jan-17 1:11

4-Jan-17 1:11

55/5000
if I use two dlls? Again I have the same problem. Think of a programmer or business who sells dlls (my case) and sells more than one to the same client.

in this case, from Main I can reference the global space of the first dll (not a good solution), but from the second dll I can not. I do not know how to refer from dlls to a common global space from Main, because I can not do without the global variables since many functions use them constantly. Seriously c# does not have a global space and Microsoft closes the topic with a brief patch That does not solve this problem? Can not be.

modified 4-Jan-17 12:24pm.

Richard MacCutchan4-Jan-17 1:16

4-Jan-17 1:16

The only solution to this issue is to remove the duplicated code from your application. You may even need to rethink your design.

zequion4-Jan-17 6:41

4-Jan-17 6:41

I'm wondering if I can compile the two dlls with the reference to Cls_Common.cs and from main do something like (if possible):
Name_Common.Cls_Common.StCommon = new global::Name_Common.St_Common();

And when I have to call the dlls do something like:
Name_Encrypt.Cls_Encrypt.StCommon = (Name_Common.St_Common)Name_Common.Cls_Common.StCommon

Help, thank you.

Richard MacCutchan4-Jan-17 6:47

4-Jan-17 6:47

That does not sound right. It seems to me that you are trying to make things much more complicated than they need to be with this. Whatever purpose this class serves, you can only have it in one place, either in the DLL or in the EXE part, not in both.

zequion4-Jan-17 7:57

4-Jan-17 7:57

I have many functions that use global variables. I need to access a common space from the dlls and Main. Is it too much to ask? Does not C# do? We are not going well.

Richard MacCutchan4-Jan-17 21:27

4-Jan-17 21:27

Regequion wrote:
Is it too much to ask?

No, not at all. But you do need to get the design right, and work within the rules of what is possible and allowed. And, most of all, what is logical.

how to store the value selection on calendar in database

Gerry Schmitz4-Jan-17 7:52

Gerry Schmitz

4-Jan-17 7:52

I don't see why you can't just create a "Common.dll" (in the "MyApp.Common" namespace, for example), that contains singletons or statics for your "shared" data and methods.

As long as this dll does not reference other dll's "higher up" (to avoid circular references), then there should be no problem "sharing".

being A.S.3-Jan-17 18:37

being A.S.

3-Jan-17 18:37

how to store the value selection on calendar in database

Re: how to store the value selection on calendar in database

dan!sh 3-Jan-17 19:55

Retrieving data from a webpage

3-Jan-17 19:55

There is a lot left for us to assume. Can you share these details so you can get a better response:

Is this Windows Forms, WPF, ASP.Net WebForm, MVC, something else?
Which database are you using (not really relevant though)?
Have you tried anything yet?
If 3 is a yes, post the code, tell us what is error/exception you get.

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

MAW303-Jan-17 13:46

3-Jan-17 13:46

I am trying to retreive data from a webpage with a label saying "export". The data is partially showing on the screen, if I manually click on "export" a window comes up and ask to save, save as, or cancel. I then save all data to my computer as a csv file. However when trying to get the data using c# I get the code behind "export" and not the data, code starts out as "".

I am using the following code:

WebClient webClient = new WebClient();
webClient.UseDefaultCredentials = false;
webClient.Credentials = new NetworkCredential(strUsername, strPassword);
webClient.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
webClient.DownloadFile(url, @strOutputFile);

*note url is for "export".

Can someone please point me in the right direction.
Any help will be greatly appreciated.
Thanks in advance.
Michael

modified 3-Jan-17 20:49pm.

dan!sh 3-Jan-17 17:30

3-Jan-17 17:30

Are you trying to get the page HTML or some specific data from it?

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

MAW303-Jan-17 19:01

3-Jan-17 19:01

I am trying to get the csv file full of data not the html code.

dan!sh 3-Jan-17 19:53

3-Jan-17 19:53

OK, and I assume the URL in the DownloadFile method ends with CSV. Is that correct?

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

MAW303-Jan-17 21:28

3-Jan-17 21:28

yes

dan!sh 3-Jan-17 22:01

3-Jan-17 22:01

One thing might be happening here is that the website expects you to reach to file from the page where the button is. Can you add appropriate (that page's URL) referrer header to your request and check?

"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]

MAW304-Jan-17 4:43

4-Jan-17 4:43

The following is the website:
"http://finviz.com/screener.ashx?v=150&ft=4" however you have to pay for the service to get data, which will be "http://elite.finviz.com/screener.ashx?v=150&ft=4".

Find the button export the url on that is "http://elite.finviz.com/export.ashx?v=150&ft=4"
This is the actual url I use then add or don't add ".csv".
if I enter the url in my browsers command line, the file is downloaded, but when I use c# I get html code.

MAW304-Jan-17 18:59

4-Jan-17 18:59

Can anybody else possibly help with this.
Thanks in advance,
Michael

Richard MacCutchan4-Jan-17 21:57