CurrencyManager and Classes

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  13 years ago

  by TempleGate

  RTunoly

  , United Arab Emirates

  Joined 13 years ago

  Hi,
  
  I have created a class on my own which reads a XML file from C: drive. The class has similar looks as below (not all the code is shown here).
  
  Public Class ABC
  
     dim ds as new dataset
     dim dt as new datatable
  
      public sub new()
      mybase.new()
      GetData()
      end sub
  
      Private sub GetData
      try
          ds.readxml(application.startuppath & "\filename.xml", xmlreadmode.readschema)
          catch ex as filenotfoundexception
          ...do something
      finally
      dt = ds.tables("xyz")
      end try
       end sub
  
  end class
  
  The above is all fine (unless someone can tell me what I am doing wrong from the above). The problem and the question that I have is : How do I add a CurrencyManager for the Datatable mentioned in the code above in code?
  
  Could someone tell me how to do this?
  
  Thanks & Best Regards
  TempleGate
  

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• • Reply

  13 years ago

  by TempleGate

  RTunoly

  , United Arab Emirates

  Joined 13 years ago

  Thanks Atul for replying and trying to assist...but...

  I have already tried what you have said above...maybe...my query was not clear enough.

   See, I am trying to use a currencymanager inside a brand new (self created from blank) class which does not belong to any other class nor is derived from any other class other than the default system "Object" (base) class. Therefore, the second line that you mentioned "myCurrencyManager = CType(me.BindingContext(dt), CurrencyManager) " gives me an error saying "BindingContext" is not declared or something in the same likes.

   Hope I made myself clear.

  Rgds

  TempleGate

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  13 years ago

  by TempleGate

  RTunoly

  , United Arab Emirates

  Joined 13 years ago

  Great help...still...but !!! again

  I think you have created a Form and within that form is where you are trying to create and use the CurrencyManager. Whereas I am trying to create a Class from scratch...ie...I go to New Project and select Class Library as the type of project and start fromt there. I have tried something else and seems to be working...but do not know if it is the correct way forward...do tell me if it is or not if you know.

   See...what I did is as follows :

  public Class ABC : Inherits Systems.windows.forms.control

  ....rest of the code goes in between here

  end class

   With the above Underlined line added to my class...my class inherits all the public properties and methods for the Control Class. But now, my only question is...is this the correct way...will this way of creating my class end me up with some bugs/problems in the future. The reason why I have this doubt is because...if you read the help section for the System.Windows.Forms.Control...it will say that this class is inherited for anything that needs a visual interface...like a button...or any other control that you and me would use on a form.

   Let me know your views.

  Rgds

  TempleGate

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  13 years ago

  by m8mbl

  Man-Bun Lee

  , United Kingdom

  Joined 13 years ago

  No. You're inheriting a class based on control, and by doing it this way, you will have to build your own currencymager; which is not recommended. If you want to add a currency manager just reference System.Windows.Forms to your app, and if you want to add your own functionality to the CurrencyManager, inherit from System.Windows.Forms.BindingManagerBase; although you're going to have to do a lot of overriding and implementing.

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