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Explore Stack Internal(.NET 3.5 and upper).NET 3.5 and upper: Usign LINQ Intersect():
var items = map1.Keys.Intersect(map2.Keys) .Select(k => map1[k] + " / " + map2[k]) .ToList(); <.NET 3.5
IList<string> results = new List<string>(); foreach (var key in map1.Keys) { if (map2.ContainsKey(key)) { results.Add(map1[key] + " / " + map2[key]); } } OUTPUT: M1-A / M2-A M1-B / M2-B (.NET 3.5 and upper) Usign LINQ Intersect():
var items = map1.Keys.Intersect(map2.Keys) .Select(k => map1[k] + " / " + map2[k]) .ToList(); OUTPUT: M1-A / M2-A M1-B / M2-B .NET 3.5 and upper: Usign LINQ Intersect()
var items = map1.Keys.Intersect(map2.Keys) .Select(k => map1[k] + " / " + map2[k]) .ToList(); <.NET 3.5
IList<string> results = new List<string>(); foreach (var key in map1.Keys) { if (map2.ContainsKey(key)) { results.Add(map1[key] + " / " + map2[key]); } } OUTPUT: M1-A / M2-A M1-B / M2-B First thing - use typed Dictionary<TKey, TValue> rather than Hashtable, below is example when values are of string type, this would be easy changing string to your custom type (I believe enum or already string constants).
IDictionary<string, string> map1 = new Dictionary<string, string> { {"A", "M1-A"}, {"B", "M1-B"}, {"C", "M1-C"} }; IDictionary<string, string> map2 = new Dictionary<string, string> { {"A", "M2-A"}, {"B", "M2-B"}, {"D", "M2-D"} }; (.NET 3.5 and upper) Usign LINQ Intersect():
var items = map1.Keys.Intersect(map2.Keys) .Select(k => map1[k] + " / " + map2[k]) .ToList(); OUTPUT: M1-A / M2-A M1-B / M2-B