How to: Return the Set Union of Two Sequences (LINQ to SQL)

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Use the Union operator to return the set union of two sequences.

Example

This example uses Union to return a sequence of all countries in which there are either Customers or Employees.

Dim infoQuery = _
    (From cust In db.Customers _
    Select cust.Country) _
    .Union _
        (From emp In db.Employees _
        Select emp.Country)

var infoQuery =
    (from cust in db.Customers
    select cust.Country)
    .Union
        (from emp in db.Employees
        select emp.Country)
;

In LINQ to SQL, the Union operator is defined for multisets as the unordered concatenation of the multisets (effectively the result of the UNION ALL clause in SQL).

See Also

Reference

Standard Query Operator Translation (LINQ to SQL)

Other Resources

Query Examples (LINQ to SQL)