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IDictionary using a single string in place of 2 - IDictionary<string>

Posted on 2014-12-31
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Last Modified: 2015-06-11
The application I'm working on runs a report in SSRS.  I'm adding the parameters for a dropdown list.  The way that I'm pulling the list from the database has changed.  I'm now pulling a list of instructors from a table that only has the instructor name and no id, as I used before.  I was pulling and using the instructor ID and instructor Name for the key and value.  I now have only the instructor name.  So, I changed all of the entries in the application to have only a single string. and am using the
CONSTANT_DROPDOWNLIST_VALUE_NAME_DropDownList_Instructors.  However, I do get the error that it using the generic IDictionary requires 2 arguments.  It wants me to create a new class or type.  I've done a search in the application to find all code for the dropdownlist and changed them all.  Not sure what I need to do.  I've tried creating the class and that does clear the error.  But I'm not sure what to put in that class.
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Question by:Sherry
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Expert Comment

by:pcelba
ID: 40526523
Just one note: The previous way to use ID and name was better. You should not use name as a unique key in your data. The name can change in time whereas the ID is unique and constant...

IDictionary always requires two arguments - that's the way all dictionaries work. If you need just one argument use IList or ICollection.

More info: http://msdn.microsoft.com/en-us/library/6sh2ey19%28v=vs.110%29.aspx

More info about IDictionary:
http://msdn.microsoft.com/en-us/library/xfhwa508%28v=vs.110%29.aspx
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by:Sherry
ID: 40527969
I thought the ID and Name were better also.  I did get this to work by using the two arguments.  I used the same parameter for both.  I wasn't able to get the supervisor to add the ID to the table.  So, will do it her way.  Thank you for the response.  Happy New Year.
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pcelba earned 1500 total points
ID: 40528172
Great workaround!
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