generics

问题 I am trying to create Delegate for reading/writing properties of unknown type of class at runtime. I have a generic class Main<T> and a method which looks like this: Delegate.CreateDelegate(typeof(Func<T, object>), get) where get is a MethodInfo of the property that should be read. The problem is that when the property returns int (I guess this happens for value types) the above code throws ArgumentException because the method cannot be bound. In case of string it works well. To solve the

问题 I am trying to create Delegate for reading/writing properties of unknown type of class at runtime. I have a generic class Main<T> and a method which looks like this: Delegate.CreateDelegate(typeof(Func<T, object>), get) where get is a MethodInfo of the property that should be read. The problem is that when the property returns int (I guess this happens for value types) the above code throws ArgumentException because the method cannot be bound. In case of string it works well. To solve the

问题 I've read some information about generics in .ΝΕΤ and noticed one interesting thing. For example, if I have a generic class: class Foo<T> { public static int Counter; } Console.WriteLine(++Foo<int>.Counter); //1 Console.WriteLine(++Foo<string>.Counter); //1 Two classes Foo<int> and Foo<string> are different at runtime. But what about case when non-generic class having generic method? class Foo { public void Bar<T>() { } } It's obvious that there's only one Foo class. But what about method Bar

问题 Is it possible to have a protocol that specializes a generic protocol? I want something like this: protocol Protocol: RawRepresentable { typealias RawValue = Int ... } This does compile, but when I try to access the init or rawValue from a Protocol instance, its type is RawValue instead of Int . 回答1: In Swift 4, you can add constraints to your protocol: protocol MyProtocol: RawRepresentable where RawValue == Int { } And now all methods defined on MyProtocol will have an Int rawValue. For

问题 I have an interface: public interface ICrawlService<T> where T : SocialPostBase { Task<int> Crawl(int accountId, Disguise disguise, ISocialAccountRepository socialAccountRepository, ISocialRepository<T> socialRepository, ISocialCrawlJobRepository jobRepository, IInstrumentationRepository instrumentationRepository); } My social repository is: public interface ISocialRepository<T> where T : class { IEnumerable<SocialPostCollection<T>> List { get; } Task Add(SocialPostCollection<T> entity,

问题 Hi all I am trying to filter the table using where class by passing parameter to the method like as below, private IQueryable<SpaceFunctionType> Get<TEntity>(Expression<Func<TEntity, bool>> predicate) where TEntity : class, ICategorySpaceFunction { return _dbContext.Set<TEntity>().Where(predicate) .Select(c => new SpaceFunctionType { Category = c.Category, SpaceFunction = c.SpaceFunction }); } public IQueryable<SpaceFunctionType> GetSpaceFunctionType(string environmentSource) { return Get

问题 How can I create a reusable module for iteration which allows me to: choose whether it iterates in parallel lets me specify a higher-order function of which tasks need to be performed Here are some dummy functions. They for itself pose the second part of the question: Should I have an interface here that each of these functions at least implements the parameter inputDay:String ? or is it better to have a generic function with a configuration class, where the configuration implements a minimal

问题 Just like this question I'm having issues invoking a method that has the "params" keyword. I keep getting TargetParameterCountException exceptions. "Parameter count mismatch". The goal is to call this method with no parameters: IList<T> List(params Expression<Func<T, object>>[] includeProperties); Here is what I have so far: //Get generic type var entityType = typeof(Applicant).Assembly.GetType(string.Format("Permet.BackEnd.ETL.Domain.Models.{0}", tableName)); //create service that will

问题 Just like this question I'm having issues invoking a method that has the "params" keyword. I keep getting TargetParameterCountException exceptions. "Parameter count mismatch". The goal is to call this method with no parameters: IList<T> List(params Expression<Func<T, object>>[] includeProperties); Here is what I have so far: //Get generic type var entityType = typeof(Applicant).Assembly.GetType(string.Format("Permet.BackEnd.ETL.Domain.Models.{0}", tableName)); //create service that will

问题 Just like this question I'm having issues invoking a method that has the "params" keyword. I keep getting TargetParameterCountException exceptions. "Parameter count mismatch". The goal is to call this method with no parameters: IList<T> List(params Expression<Func<T, object>>[] includeProperties); Here is what I have so far: //Get generic type var entityType = typeof(Applicant).Assembly.GetType(string.Format("Permet.BackEnd.ETL.Domain.Models.{0}", tableName)); //create service that will