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How to merge 2 dictionaries of IDictionary<Guid, MyObject> where MyObject is a class instance?
IDictionary<Guid, MyObject> d1 = new Dictionary<Guid, MyObject>();
d1.Add(guid1, m1);
d1.Add(guid2, m2);
d1.Add(guid3, m3);
IDictionary<Guid, MyObject> d2 = new Dictionary<Guid, MyObject>();
d2.Add(guid2, m2);
d2.Add(guid3, m3);
d2.Add(guid4, m4);
IDictionary<Guid, MyObject> d3 = d1.Union(d2) ???
That in d3 there are the following entries:
guid1,m1
guid2,m2
guid3,m3
guid4,m4
456
The Key value of a Dictionary is unique and doesn't let you add a duplicate key entry.
In Dictionary, the key cannot be null, but value can be. In Dictionary, key must be unique. Duplicate keys are not allowed if you try to use duplicate key then compiler will throw an exception. In Dictionary, you can only store same types of elements.
All of these associate a key with a value and are represented internally by a collection of key/value pairs. However, none of them permit duplicate keys and so, if you try to add an item whose key is already present, an exception is thrown.
d1.Concat(d2.Where( x=> !d1.Keys.Contains(x.Key)));
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