C#中使用Linq实现全外连接

每次使用都到处查阅，现在记录下来，备查。

var fulljoin = (
from s in sampleRegisters
join t in tensionDatas
on new { Beach = s.Beach, Hook = s.Hook } equals new { Beach = t.Beach, Hook = t.Hook } into havematch
where !havematch.Any()
select new { SampleID = 0, Beach = s.Beach, Hook = s.Hook, Beacht = "",Hookt = ""})
.Concat(
    from s in sampleRegisters
    join t in tensionDatas
    on new { Beach = s.Beach, Hook = s.Hook } equals new { Beach = t.Beach, Hook = t.Hook }
    select new { SampleID = s.SampleID, Beach = s.Beach, Hook = s.Hook, Beacht =t.Beach, Hookt = t.Hook }
)
.Concat(from t in tensionDatas
    join s in sampleRegisters
    on new { Beach = t.Beach, Hook = t.Hook } equals new { Beach = s.Beach, Hook = s.Hook } into havematch
    where !havematch.Any()
    select new { SampleID = 0, Beach ="", Hook = "", Beacht = t.Beach, Hookt = t.Hook }
);

 几个变量的类型：

SampleID：int

Beach：string

Hook：string