如何将 lambda 表达式传递给 WCF 服务? [英] How can I pass a lambda expression to a WCF service?
问题描述
我当前的项目使用 IDesign 架构，所以我所有的层都是服务.我想让我的资源访问层的 CRUD 中的 Read 方法采用 lambda 表达式形式的谓词以及要拉取的相关对象列表.这样资源访问层就会非常通用.
My current project is using the IDesign architecture, so all of my layers are services. I wanted to have my Read method in the CRUD of my resource access layer take a predicate in the form of a lambda expression as well as a list of related objects to pull. This way the resource access layer will be very generic.
[OperationContract]
Result<MyObject> ReadObjects(Func<MyObject, bool> predicate, string[] includes);
现在我发现了一些应该很明显的事情，那就是我无法序列化 lambda 表达式.我研究过将字符串解析为 lambda 表达式，但这也不行.
Now I have come to discover something that should have been obvious, and that is that I cannot serialize lambda expressions. I looked into parsing a string into a lambda expression, but that is a no go as well.
是否有任何方法可用于将 lambda 表达式传递给服务?有没有更好的方法来做我想做的事情?
Is there any method that I can use to pass a lambda expression to a service? Is there a better way to do what I am trying to do?
推荐答案
也许动态查询适用于您的情况?
Perhaps a dynamic query would work in your situation?
您将一个 where 子句字符串传递给服务，该服务将验证并将其转换为表达式
You would pass a where clause string to the service which would validate and convert it to an expression
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