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func    
函数,功能

函数,功能


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  • 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
  • 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
  • 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
  • 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:
  • Whats the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
    __PRETTY_FUNCTION__ handles C++ features: classes, namespaces, templates and overload main cpp #include <iostream> namespace N { class C { public: template <class T
  • c# - Func delegate with no return type - Stack Overflow
    All Func delegates return something; all the Action delegates return void Func<TResult> takes no arguments and returns TResult: public delegate TResult Func<TResult>() Action<T> takes one argument and does not return a value: public delegate void Action<T>(T obj) Action is the simplest, 'bare' delegate: public delegate void Action()
  • How to use Func lt;T gt; in built-in dependency injection
    In AddFactories we get a list of all the concreate types that are registered then check their constructors for any Func<> From that list remove any Func that has been registered before Using some expressiontrees we build the needed Funcs The code is also over in codereview, minus the check for already registered funcs
  • C#: Func lt;T, TResult gt; for generic methods - Stack Overflow
    For example, suppose you want some Func that returns the elements of an IEnumerable<int> object in sorted order (precisely like OrderBy<int, int>) You could do this: Func<IEnumerable<int>, Func<int, int>, IOrderedEnumerable<int>> orderByFunc = System Linq Enumerable OrderBy<int, int>; Then you could use this Func just like any other:





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