假设我有以下两个LINQ查询我想重构：

Suppose I have the two following Linq queries I want to refactor:

var someValue1 = 0;
var someValue2= 0;
var query1 = db.TableAs.Where( a => a.TableBs.Count() > someValue1 )
                  .Take( 10 );
var query2 = db.TableAs.Where( a => a.TableBs.First().item1 == someValue2)
                  .Take( 10 );

请注意，只有当参数的变化。有什么办法可以把查询的方法内，作为参数传递的参数在哪里？

Note that only the Where parameter changes. There is any way to put the query inside a method and pass the Where parameter as an argument?

推荐答案

病程中出现。在其中，参数类型的只是一个简单的封闭 Func键＆LT; T，布尔＆GT; （其中T是你的数据库的项目类型 - 我不知道出来的$的C $ C），你可以把它包装成一个（匿名）函数。

Of couse there is. The where parameter is just a simple closure of type Func<T, bool> (where T is the type of your DB items - I don't know them out of your code) and you can wrap it into a (anonymous) function.

Func<Func<T, bool>, IEnumerable<T>> MakeQuery = (Func<T, bool> whereParam) => db.TableAs.Where(whereParam).Take(10);

使用像这样

var query1 = MakeQuery(a => a.TableBS.Count() > someValue1);