Pass void as a parameter to a static method

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I have one dropdown list that is filled from another dropdown list. This action takes place in many web pages of my site. I thought about creating a general method that takes some parameters which will fill the dependant dropdown list. The following is my proposed static method:

C#

public static  void FillDropDownList(string Parent_Ddl_Value,
                                     DropDownList Child_Ddl,
                                     ?? voidtofillchilddropdownlist);

I need to pass this void voidtofillchilddropdownlistas parameters & execute it? How can this be achieved.

Thanks for your time!

Posted 7-Sep-11 21:54pm

md_refay

Updated 7-Sep-11 22:11pm

Manfred Rudolf Bihy

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Timberbird 8-Sep-11 3:55am

Why void and not object?

Manfred Rudolf Bihy 8-Sep-11 4:14am

Edit: Pre tags and clarity.

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OriginalGriff · Answer 1 · 2011-09-07T22:05:00

You cannot pass a void - a void is the absence of something.
Either pass a null, or (as I suspect) pass a delegate. The later is a "pointer to a method" that can be executed in FillDropDownList to do the actual filling: MSDN can explain best how to do that. http://msdn.microsoft.com/en-us/library/ms173172.aspx[^]

GParkings · Answer 2 · 2011-09-07T22:12:00

I'm not sure your approach is correct here but your requirements are unclear. (Also, im guessing DropDownList is actually a winfows.forms.comboBox but since i cant gurantee that im going to make no assumptions about the exposed methods/properties)

do you:

Want to copy the entire contents of one drop-down list to another?
you should have the following arguments:
- DropDownList sourceList
- dropDownList destinationList
want to copy a single value from one drop-down list to another
you should have the following arguments:
- object valueToCopy
- dropDownList destinationList
Want to copy a contiguous range of values from one drop-down list to another:
you should have the following arguments:
- DropDownList sourceList
- dropDownList destinationList
- int firstValueIndex
- int lastValueindex
Want to copy a non-contiguous range of values from one drop-down list to another:
you should have the following arguments:
- DropDownList sourceList
- dropDownList destinationList
- int[] indicesToCopy

I hope that helps you some!

Manfred Rudolf Bihy · Answer 3 · 2011-09-07T22:20:00

As OriginalGriff[^] already mentioned it's most likely that it is delegates that you're after. You still missed telling us what the signature of that delegate is though, apart from the fact that the method is not supposed to return anything. I take it then, that this method is called solely on the purpose of it's side effect.

Please elaborate on your question and tell us what you're trying to achieve by calling this method which is passed in via a delegate and I will update my solution in accordance to the added information you'll supply. Use the link Improve question to improve your question.

Best Regards,

—MRB

Pass void as a parameter to a static method

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