❔ How do you merging Dictionaries into one Dictionary?

Has anyone merged two dictionaries of same type into one?

I read something like this


var result = dictionaries.SelectMany(dict => dict)
                         .ToLookup(pair => pair.Key, pair => pair.Value)
                         .ToDictionary(group => group.Key, group => group.First());

I read something like this


var result = dictionaries.SelectMany(dict => dict)
                         .ToLookup(pair => pair.Key, pair => pair.Value)
                         .ToDictionary(group => group.Key, group => group.First());

I read something like this


var result = dictionaries.SelectMany(dict => dict)
                         .ToLookup(pair => pair.Key, pair => pair.Value)
                         .ToDictionary(group => group.Key, group => group.First());

I read something like this


var result = dictionaries.SelectMany(dict => dict)
                         .ToLookup(pair => pair.Key, pair => pair.Value)
                         .ToDictionary(group => group.Key, group => group.First());

Lookup(https://learn.microsoft.com/en-us/dotnet/api/system.linq.lookup-2?view=net-7.0).

But will this code make the dictionary distinct (that values and keys don't repeat). I rather use same key and add the value from the dictionary i'm merging/joining.

Maybe this option makes it ignore

new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase);

new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase);

new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase);

new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase);

Lookup Class (System.Linq)

Represents a collection of keys each mapped to one or more values.

❔ How do you merging Dictionaries into one Dictionary?

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