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Any idea why this behaviour is different?
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Dictionary will hash the key supplie to get the index , in case of null , hash function can not return a valid value that's why it does not support null in key.
Access Dictionary Elements Using Index var element = capitals. ElementAt(2); The ElementAt method provides us array-like access capability to key-value pairs of Dictionary<string, string> . As with C# arrays, the index of the first element is 0.
Dictionaries can't have null keys.
It is totally legal to have NULL values in dictionaries or key-value pairs in both c# and/ or JavaScript. In C# it is correct to do something like var fullName = meta["FullName"] and then fullName equals NULL . If the Serializer removes all NULL values, you are forced to test with Meta. ContainsKey or Meta.
Here's the answer.
The primary reason Dictionary throws is that there is no "error" value that works over any V. Hashtable is able to return null because the key is always a reference type.
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So there will be no ambiguity between when the value of dictionary[key] stores a null value and when the key doesn't exist. Hashtable[key] will return null if it stores null or the key doesn't exist.
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