I'm trying to write a Dictionary
extension that works independently of the data types of Key/Value. I tried pass it by using the object
data type, assuming that it will works with any type.
My code:
public static class DictionaryExtensionsClass
{
public static void AddFormat(this Dictionary< ?? unknow type/*object*/, ??unknow type/*object*/> Dic, ??unknow type/*object*/ Key, string str, params object[] arglist)
{
Dic.Add(Key, String.Format(str, arglist));
}
}
You just make the method generic:
public static void AddFormat<TKey>(this Dictionary<TKey, string> dictionary,
TKey key,
string formatString,
params object[] argList)
{
dictionary.Add(key, string.Format(formatString, argList));
}
Note that it's only generic in the key type as the value would have to be string
(or potentially object
or an interface that string
implements, I guess) given that you're going to add a string value to it.
Unfortunately you can't really express the constraint of "only allow value types where string
is a valid value" in a generic type constraint.