Due to the existing framework I am using, a method call is returning a SortedList object. Because I wrote the other side of this call I know that it is in fact a SortedList. While I can continue to work with the SortedList, using the generic would convey my meaning better. So, how do you change the non-generic SortedList into an appropriately typed generic SortedList?
The background on this is that the call is a remote procedure call using the SoapFormatter. The SoapFormatter does not implement generics (Thank you, Microsoft). I cannot change the formatter since some non-.Net programs also use other method calls against the service.
I would like my proxy call to look like the following:
public SortedList<string, long> GetList(string parameter)
{
return _service.GetList(parameter);
}
Where the interface for the GetList call is as follows due to the SoapFormatter requirements:
public SortedList GetList(string parameter);
You can't directly convert, as a SortedList
is not actually a SortedList<T>
, even if it only contains elements of type T
.
In order to turn this into your appropriate type, you'd need to create a SortedList<T>
and add all of the elements into it.
A conversion function for your usage:
static SortedList<TKey,TValue> StronglyType<TKey,TValue>(SortedList list) {
var retval = new SortedList<TKey,TValue>(list.Count);
for(int i=0; i<list.Count; i++)
retval.Add((TKey)list.GetKey(i), (TValue)list.GetByIndex(i));
return retval;
}
The equivalent foreach(DictionaryEntry entry in list)
approach is slightly slower due to the implicit cast to unbox the DictionaryEntry
(you always need the casts to TKey/TValue).
Ballpark performance overhead: On my years old machine here, this function takes 100ms to convert a 1000 lists with 1000 entries each.
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