关于EF的函数问题
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最佳答案
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public delegate TResult Func<in T1,in T2,out TResult>(T1 arg1, T2 arg2);
Type Parameters
- T1
The type of the first parameter of the method that this delegate encapsulates.
This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see Covariance and Contravariance in Generics.- T2
The type of the second parameter of the method that this delegate encapsulates.
This type parameter is contravariant. That is, you can use either the type you specified or any type that is less derived. For more information about covariance and contravariance, see Covariance and Contravariance in Generics.- TResult
The type of the return value of the method that this delegate encapsulates.
This type parameter is covariant. That is, you can use either the type you specified or any type that is more derived. For more information about covariance and contravariance, see Covariance and Contravariance in Generics.SO:（t0,t1）=>true;
收获园豆：10
报错了，不识别x，请问这是什么情况
