What I am trying to do is come up with a way to determine how many unique
extensions there are within a directory and its sub directories. Within the
loop that recurses root folder, I am attempting to use a SortedList. Below
is the code:

private System.Collections.SortedList _ArrayListOfExtensions = new
SortedList(new CaseInsensitiveComparer());

System.Int32 myIndexOfValue = -1;
myIndexOfValue =
this._ArrayListOfExtensions.IndexOfKey(myCurrentFile.Extension.ToLower());

if (myIndexOfValue == -1)
{
this._ArrayListOfExtensions.Add(myCurrentFile.Extension.ToLower(), 1);
}

The Exception error that I am getting is:
"Unable to cast object of type 'System.Collections.DictionaryEntry' to type
'System.String'."

Any help would be appreciated as to how to correct this error. Also, if you
know of a better way (I have tried several) to accomplish the above, I am
open to your suggestions.

The results should be similar to:

15 .docx
17 .doc
14 .txt
7 .exe
etc...

Thanks!
Edwin

Edwin <(E-Mail Removed)> wrote:
> What I am trying to do is come up with a way to determine how many unique
> extensions there are within a directory and its sub directories. Within the
> loop that recurses root folder, I am attempting to use a SortedList. Below
> is the code:
>
> private System.Collections.SortedList _ArrayListOfExtensions = new
> SortedList(new CaseInsensitiveComparer());

SortedList isn't an ArrayList - it's a dictionary, basically.

Are you using .NET 3.5? LINQ would make this pretty much trivial...

--
Jon Skeet - <(E-Mail Removed)>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com

Thank you Jon for your reply,

I am using Visual Studio 2008 Professional with .Net 3.5

I appreciate your assistance.

Edwin

"Jon Skeet [C# MVP]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Edwin <(E-Mail Removed)> wrote:
>> What I am trying to do is come up with a way to determine how many unique
>> extensions there are within a directory and its sub directories. Within
>> the
>> loop that recurses root folder, I am attempting to use a SortedList.
>> Below
>> is the code:
>>
>> private System.Collections.SortedList _ArrayListOfExtensions = new
>> SortedList(new CaseInsensitiveComparer());
>
> SortedList isn't an ArrayList - it's a dictionary, basically.
>
> Are you using .NET 3.5? LINQ would make this pretty much trivial...
>
> --
> Jon Skeet - <(E-Mail Removed)>
> Web site: http://www.pobox.com/~skeet
> Blog: http://www.msmvps.com/jon.skeet
> C# in Depth: http://csharpindepth.com

Edwin <(E-Mail Removed)> wrote:
> Thank you Jon for your reply,
>
> I am using Visual Studio 2008 Professional with .Net 3.5
>
> I appreciate your assistance.

In which case I suggest you look at the overloads of Enumerable.GroupBy
which take an IEqualityComparer<TKey>.

--
Jon Skeet - <(E-Mail Removed)>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com