reflection

问题 Let's imagine that we have a JavaScript class: var Person = (function () { function Person(name, surname) { this.name = name; this.surname = surname; } Person.prototype.saySomething = function (something) { return this.name + " " + this.surname + " says: " + something; }; return Person; })(); I want to iterate its methods and properties. I have no problem with the methods. var proto = Person.prototype, methods = Object.keys(proto); // iterate class methods ["saySomething"] for (var i = 0; i <

问题 I know I can fetch the method info using GetMethods , but I want to know how to do it properly without GetMethods . I have read other SO questions and answers that suggest this is not possible, or suggest just using LINQ instead, but that isn't really an answer to the question. Consider at the most basic level, a static generic function that takes a single generic parameter. private static void Test<T>(T val) { } To fetch this method info we can just call Type.GetMethod("Test", BindingFlags

问题 I want to know whether a concrete type implements a specefic interface and print it out. I have written an example [0] with a self defined struct (MyPoint) beeing not an interface-type. MyPoint has the function Read as defined in the interface of io.Reader: type MyPoint struct { X, Y int } func (pnt *MyPoint) Read(p []byte) (n int, err error) { return 42, nil } The aim is to get the information that the concrete type p implements the interface io.Writer. Therefore I have written a short main

问题 I'm using F# 4.7 with <LangVersion>preview</LangVersion> in my project file. I have a type like this: type Record = { Name : string Description : string FieldNotInterestedIn: int } I'd like to get the names of certain fields in a type-safe way, but not all of them. I know I can get all the field names using reflection. Here's the most concise code I came up with. Can it be any more concise? let certainFieldNames = let r = Unchecked.defaultof<Record> [ nameof r.Name nameof r.Description ] 回答1:

问题 I'm using F# 4.7 with <LangVersion>preview</LangVersion> in my project file. I have a type like this: type Record = { Name : string Description : string FieldNotInterestedIn: int } I'd like to get the names of certain fields in a type-safe way, but not all of them. I know I can get all the field names using reflection. Here's the most concise code I came up with. Can it be any more concise? let certainFieldNames = let r = Unchecked.defaultof<Record> [ nameof r.Name nameof r.Description ] 回答1:

问题 I am using Firestore's Java-based annotation for marking fields and methods for mapping document fields to Java class elements: @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.METHOD, ElementType.FIELD}) public @interface PropertyName { String value(); } I am using it on a field in a Kotlin data class, which compiles fine: data class MyDataClass( @PropertyName("z") val x: Int ) In IntelliJ and Android Studio, I can see it show up in the decompiled class dump: public final data class

问题 I have a bunch of IEnumerable Collections which exact number and types is subject of frequent changes (due to automatic code generation). It looks something like this: public class MyCollections { public System.Collections.Generic.IEnumerable<SomeType> SomeTypeCollection; public System.Collections.Generic.IEnumerable<OtherType> OtherTypeCollection; ... At runtime i want to determine each Type and it's count without having to rewrite the code after every code generation. So i am looking for a

问题 I am trying to create a copy of a method during runtime using reflection. I have the following code. public static R CopyMethod<T, R>(Func<T, R> f, T t) { AppDomain currentDom = Thread.GetDomain(); AssemblyName asm = new AssemblyName(); asm.Name = "DynamicAssembly"; AssemblyBuilder abl = currentDom.DefineDynamicAssembly(asm, AssemblyBuilderAccess.Run); ModuleBuilder mbl = abl.DefineDynamicModule("Module"); TypeBuilder tbl = mbl.DefineType("Type"); var info = f.GetMethodInfo(); MethodBuilder

问题 I want to get the collection of all the members that are present in a class. How do I do that? I am using the following, but it is giving me many extra names along with the members. Type obj = objContactField.GetType(); MemberInfo[] objMember = obj.GetMembers(); String name = objMember[5].Name.ToString(); 回答1: Get a collection of all the properties of a class and their values: class Test { public string Name { get; set; } } Test instance = new Test(); Type type = typeof(Test); Dictionary

问题 My application works with loading dll's dynamically, based on settings from the database (file, class and method names). To facilitate, expedite and reduce the use of reflection I would like to have a cache.... Following the idea that using: MethodInfo.Invoke Is nothing performative ( Reflection Performance - Create Delegate (Properties C#)) I would like to translate any call to methods. I thought of something that would work like this: public static T Create<T>(Type type, string methodName)