.net - Persistence of deferred execution linq expressions

Question

We're trying to serialize some data, and one of the items in a collection is a "deferred execution linq statement" (actually it's the result of a Concat call on a collection).

The problem is how to persist that object. It doesn't support ISerializable. The actual type is something along the lines of System.Linq.Enumerable.WhereSelectListIterator<>

Just wondering if anyone had run into this before, and what the solution was.

Answer 1

你可以调用ToList()Linq 语句；这将收集所有结果并将它们返回到List<T>您可以序列化的 a 中。

Answer 2

如果查询结果并对其进行序列化不是一种选择，您将不得不以某种方式手动序列化查询。

一个问题是有太多不同的 LINQ 查询对象类型。所有这些类型都是框架内部的。这几乎把你锁起来了。

不过，您的具体情况可能有解决方案。如果您需要序列化的唯一查询类型是Concat调用的结果，则解决方案可能不会太复杂。一切都取决于您要连接的集合以及您（或想要）序列化它们的方式。