Linq custom comparer for contains? -

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I have 2 lists, I want to compare each element with both lists using LINQ ( Versus using nested loop) but, my needs have not been fulfilled because I need to make custom comparisons. I think a custom quicker is needed, but I do not believe 100%.

I do not think it should be very difficult, but it is not certain what I want for this device. There are 2 different and different types of objects in 2 lists.

Update:

Sorry, if I was not clear. I have 2 lists (or calculators), I can do something like this: (object I in list 1) foreach (2ItemType in other list) {if (compare (x) ) Do something; }

What I want to do is something like this: 

  var matches = myList1 Where (t = & gt; myList2.Something (t)) Where are some custom comparisons, maybe I can override the parity compared to the comparison? I can use .  But I have to argue for comparison. 
 
 Update: I thought about using the  IEqualityComparer  but it is set to take the type of T, T and T, Y. There are some common obstacles that I can use to solve this problem. I thought it should be easy / simple. 
 

  var matches = myList1 Selectmen (t1 = & gt; myList2.Where (T2 = & gt; T. some (T1));

Inner where is inside your inner foreach loop, and after the external SelectMany results Walking as your external foreach loop.

You can also do a task to do this for yourself (unused; extensions can not remember the syntax):

Public Fixed IEnumerable & lt; T2 & gt; Multicompore & lieutenant; T1, T2 & gt; (This IEnumerable & lt; T1 & gt; first, IEnumerable & lt; T2 & gt; second, funk & lt; bool, T1, T2 & gt; compare) {Return. first of all. Select (t1 = & gt; second.Where (t2 = & gt; comparer T1, T2))); }

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