sql - How to use null in join condition in linq -

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I'm having trouble translating this SQL statement into a linq query. I have not found a way that I Zero or use in the JOIN position. Here is the sample SQL statement:

SELECT a. * From a table A to TableB b (a.Id = b.Id) or a.Id is NULL

What will be the same linq statement? I am looking for a cover which is similar to one of the above SQL statements.

Add B on TableB to one of TableA ??? equal ??? Select one;

I have searched for an existing term, but apparently nobody got this particular issue. Thank you.

join s are so sweet, so that you can use them only For specific things, however, getting the same result with the nested statement is easy: 

 From  to TableB in TableB, where a.Id == b. Id or an IID == select zero;   
 In addition to what data you really want to find, this could be a more appropriate query:  
 From  to table A where an id == faucet || Select TableB.Any (B = & gt; BIID == a.Id) one;

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