I've found plenty of info on the web about making dictionaries able to do case insensitive look-ups such that if I added a key/value pair of ("A", "value") calling
MyDict["a"] == MyDict["A"]
will return true.
What I want to know is why I get a "key has already been added" error when I do
MyDict.Add("A", "value1");
MyDict.Add("a", "value2");
if I defined my dictionary to do case sensitive look-ups. Is there no way to define a Dictionary to be able to add different cased keys?
Dictionaries are case-sensitive by default - you don't need to do anything.
The default constructor of C# Dictionary class constructs a Dictionary object, in which the keys are case sensitive. So when you insert data pairs <Key, Value> and <key, Value>, they are regarded as two different items.
YES, Python is a case-sensitive programming language. This means that it treats uppercase and lowercase letters differently.
In computers, case sensitivity defines whether uppercase and lowercase letters are treated as distinct (case-sensitive) or equivalent (case-insensitive).
The OP is actually correct if he was using the StringDictionary Class. Microsoft's site states that the key is converted to lower-case before it's stored (https://msdn.microsoft.com/en-us/library/system.collections.specialized.stringdictionary(v=vs.110).aspx). To make the key case sensitive, using the Generic Dictionary as Mark Byers suggested works nicely. If you want a case insensitive key, StringDictionary works well.
All Dictionaries
are case-sensisitive. But you can use the case-insensitive string comparers provided by the StringComparer
class to create dictionaries with case-insensitive string keys.
Check it from ideone.
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