Not able to use GetValueorDefault() for Dictionary in C#

Am i missing something ??

You are missing the fact Dictionary does not contain any method of this name GetValueOrDefault

Dictionary<TKey,TValue> Class

Maybe you are looking for

Dictionary<TKey,TValue>.TryGetValue(TKey, TValue) Method

Gets the value associated with the specified key.

or

ImmutableDictionary.GetValueOrDefault<TKey, TValue> Method (IImmutableDictionary<TKey, TValue>, TKey)

Gets the value for a given key if a matching key exists in the dictionary.

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You could however implement your own

public static class Extensions
{
    public static TValue GetValueOrDefault<TKey, TValue>(this Dictionary<TKey, TValue> dict,TKey key)
      =>  dict.TryGetValue(key, out var value) ? value : default(TValue);
}

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If you are using any of the following, there are extension method overloads for IReadOnlyDictionary

• NET 5.0 RC1

• .NET Core 3.1 3.0 2.2 2.1 2.0

• .NET Standard 2.1

CollectionExtensions.GetValueOrDefault

Tries to get the value associated with the specified key in the dictionary