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func    
函数,功能

函数,功能


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  • c# - Delegates: Predicate vs. Action vs. Func - Stack Overflow
    Action, Func and Predicate all belong to the delegate family Action: Action can take n input parameters but it returns void Func: Func can take n input parameters but it will always return the result of the provided type Func<T1,T2,T3,TResult>, here T1,T2,T3 are input parameters and TResult is the output of it
  • c# - Func vs. Action vs. Predicate - Stack Overflow
    Func is a delegate (pointer) to a method, that takes zero, one or more input parameters, and returns a value (or reference) Predicate is a special kind of Func often used for comparisons (takes a generic parameter and returns bool) Though widely used with Linq, Action and Func are concepts logically independent of Linq
  • Why would you use Expression lt;Func lt;T gt; gt; rather than Func lt;T gt;?
    Conceptually, Expression<Func<T>> is completely different from Func<T> Func<T> denotes a delegate which is pretty much a pointer to a method and Expression<Func<T>> denotes a tree data structure for a lambda expression This tree structure describes what a lambda expression does rather than doing the actual thing It basically holds data about
  • c# - Func lt;T gt; () vs Func lt;T gt;. Invoke () - Stack Overflow
    I'm curious about the differences between calling a Func lt;T gt; directly vs using Invoke() on it Is there a difference? Is the first syntactical sugar and calls Invoke() underneath anyway? pub
  • Action Func vs Methods, whats the point? - Stack Overflow
    public void DoThing(MyClass foo, Func<MyClass, string> func) { foo DoSomething; var result = func(foo); foo DoStringThing(result); } So you can specify a different Func whenever you call this method - the DoThing method doesn't need to know what's being done, just that whatever it is will return a string
  • How can I pass in a func with a generic type parameter?
    public void SomeUtility(Func<T><object,T> converter) { var myType = converter<MyType>("foo"); } Edit (see also my discussion in the comments with Lawrence) : By "generic type converter" I meant I would like to pass in a converter that can convert to any strong type <T> (not object), so the next line in my method could be:





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