Can't add keyValuePair directly to Dictionary

c# dictionary key-value generic-collections
Dave picture Dave · Oct 22, 2012 · Viewed 30k times · Source

I wanted to add a KeyValuePair<T,U> to a Dictionary<T, U> and I couldn't. I have to pass the key and the value separately, which must mean the Add method has to create a new KeyValuePair object to insert, which can't be very efficient. I can't believe there isn't an Add(KeyValuePair<T, U>) overload on the Add method. Can anyone suggest a possible reason for this apparent oversight?

Answer

DmitryG picture DmitryG · Oct 22, 2012

You can use the IDictionary<TKey,TValue> interface which provides the Add(KeyValuePair<TKey,TValue>) method:

IDictionary<int, string> dictionary = new Dictionary<int, string>();
dictionary.Add(new KeyValuePair<int,string>(0,"0"));
dictionary.Add(new KeyValuePair<int,string>(1,"1"));

Related questions

Get index of a key/value pair in a C# dictionary based on the value

I would like to know if some property or method exists that gets the index of a specific value. I found that dictionaries have the Contains() method which returns true if the value passed in exists, so this method almost …

Read More
How to update value of a key in dictionary in c#?

I have the following code in c# , basically it's a simple dictionary with some keys and their values. Dictionary<string, int> dictionary = new Dictionary<string, int>(); dictionary.Add("cat", 2); dictionary.Add("dog", 1); dictionary.Add("llama", 0); dictionary.…

Read More
What are the differences b/w Hashtable, Dictionary and KeyValuePair?

I use Dictionary in my code but my colleagues use Hashtable. MSDN says they work on Key Value pair & examples of Hashtable and dictionary are same on MSDN. Then how different are they from each other & which is …

Read More