结合几个表达式＆lt; func＆lt; t，bool＆gt;

发布于 2025-01-30 17:49:42 字数 774 浏览 3 评论 0原文

我有5个表达式＆lt; func＆lt; t，bool＆gt;在Azure存储表中过滤数据。我需要将所有这些结合起来。

Expression<Func<T,bool>> x = (e => e.a < value))
Expression<Func<T,bool>> y = ...
Expression<Func<T,bool>> z = ...
Expression<Func<T,bool>> a = ...
Expression<Func<T,bool>> b =..

现实中的表达很复杂，因此用大量或很难阅读和理解一个表达。所以我写了5个表情。现在我需要做类似的事情：（

b and（（x and y）或（z and a）））

x和y，z以及以下方式进行

var XYcombined = Expression.And(Expression.Invoke(x,parameter), Expression.Invoke(y,parameter)
var ZAcombined = Expression.And(Expression.Invoke(z,parameter), Expression.Invoke(a,parameter)
var ORcombined = Expression.Or(XYcombined, ZAcombined)

我已经按照表达式，我尝试使用表达式和表达式和表达，但是Azure返回HTTP 500。

原文

I have 5 Expression<Func<T,bool> to filter data in Azure storage table. I need to combine all of them.

Expression<Func<T,bool>> x = (e => e.a < value))
Expression<Func<T,bool>> y = ...
Expression<Func<T,bool>> z = ...
Expression<Func<T,bool>> a = ...
Expression<Func<T,bool>> b =..

Expression in reality are complex, so writing one expression with lot of or,and will be difficult to read and understand. So I wrote 5 expression. Now I need to do something like this :

(b and ((x and y) or (z and a)))

I already did x and y, z and a in following way :

var XYcombined = Expression.And(Expression.Invoke(x,parameter), Expression.Invoke(y,parameter)
var ZAcombined = Expression.And(Expression.Invoke(z,parameter), Expression.Invoke(a,parameter)
var ORcombined = Expression.Or(XYcombined, ZAcombined)

now I need to somehow combine ORcombined with one more expression, I tried to use Expression.And and Expression.AndAlso, but azure returns http 500.

分享到QQ

分享到微博