ByteBuddy generic method return cast to concrete type

ByteBuddy generic method return cast to concrete type

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ByteBuddy generic method return cast to concrete type
Tag : java , By : user183676
Date : January 11 2021, 05:14 PM

I hope this helps you . From the type information being present, this is not possible. You can either create a generic representation of the method as a MethodDescription to make the static type compatible. As an easier solution, you can just configure add
withAssigner(Assigner.DEFAULT, Assigner.Typing.DYNAMIC)

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Is it possible to have an interface method defined with a generic return type and a concrete implementation define the r

Tag : java , By : Pieter Taelman
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have would like to create an interface: , You probably want to change the interface to:
public interface OperandValue<T>
    T getValue();
public class NumberOperandValue implements OperandValue<Integer>
    public Integer getValue()
        // some integer value that is set elsewhere
        return 1;
public <Integer> Integer getValue()
public <Integer> Integer getValue()
public <T> T getValue()
public T getValue()
public Integer getValue()

Type mismatch error in method with generic return (Why do I have to do a cast to the generic type in this method, but no

Tag : java , By : cthulhup
Date : March 29 2020, 07:55 AM
Hope that helps Usually the compiler infer a method generic type (P in your case) from the method signature (loadContext in your case). But loadContext method doesn't use P on the parameters to help the compiler infer P.
Instead you are forcing the compiler to infer the type P from within the method. You want to make it believe is PageTypeOne. Is not working like this.

return generic IEnumerable when passing concrete type parameter for a generic method

Tag : chash , By : Puneet Madaan
Date : March 29 2020, 07:55 AM
seems to work fine You cannot convert the Type class to a generic T parameter without using reflection. The parameter also needs to be present as part of the method.
Jon Skeet was using type inference by example combined with generics in order to guarantee type safety and simplify the generic code. Unfortunately you will lose that type safety using Type and reflection.
private IEnumerable<EntityObject> GetFilteredData(Type entityType,
                                                  SortedList<string, string> filterList,
                                                  List<int> weeks)
    var method = typeof(<class>).GetMethod("GetFilteredDataImpl");
    var generic = method.MakeGenericMethod(entityType);
    return (IEnumerable<EntityObject>)generic.Invoke(this, new[] { filterList, weeks });

private IEnumerable<T> GetFilteredDataImpl<T>(SortedList<string, string> filterList,
                                              List<int> weeks)
    where T : EntityObject
    var data = _modelContext.CreateObjectSet<T>().AsExpandable();
      // do more filtering and then call .ToList() to return a List<T>
private IEnumerable<EntityObject> GetFilteredData(Type entityType, SortedList<string, string> filterList, List<int> weeks)
    var instance = (EntityObject)Activator.CreateInstance(entityType);
    return GetFilteredDataImpl((dynamic)instance, filterList, weeks);

private IEnumerable<T> GetFilteredDataImpl<T>(T entityType, SortedList<string, string> filterList, List<int> weeks) where T : EntityObject
    var data = _modelContext.CreateObjectSet<T>().AsExpandable();
      // do more filtering and then call .ToList() to return a List<T>

Casting concrete class to generic interface with interface as generic type results in invalid cast exception

Tag : chash , By : Debashree
Date : March 29 2020, 07:55 AM
With these it helps You need to declare your IDbTools<> interface with the in keyword
public interface IDbTools<in TCommand>
    where TCommand: IDbCommand
    void PrepareAndExecuteQuery(TCommand command);

Cast concrete type to nested generic base type

Tag : chash , By : user113409
Date : March 29 2020, 07:55 AM
wish help you to fix your issue What you are talking about is called covariance and MSDN has a great article on this here: https://msdn.microsoft.com/en-us/library/dd799517(v=vs.110).aspx
First, create a new interface:
interface IBaseRecord<out TUserInfo>
  where TUserInfo : BaseUserInfo
public class BaseRecord<TUserInfo> : IBaseRecord<TUserInfo>
    where TUserInfo : BaseUserInfo
    public virtual DateTime CreationTime { get; set; }
    public virtual TUserInfo UserInfo { get; set; }
IBaseRecord<BaseUserInfo> project1 = new Project1Record();
IBaseRecord<BaseUserInfo> project2 = new Project2Record();
interface IBaseRecordList<out TRecord, out TUserInfo>
  where TRecord : IBaseRecord<TUserInfo>
  where TUserInfo : BaseUserInfo
public class BaseRecordList<TRecord, TUserInfo> : IBaseRecordList<TRecord, TUserInfo>
IBaseRecordList<IBaseRecord<BaseUserInfo>, BaseUserInfo> project1 = new Project1RecordList();
IBaseRecordList<IBaseRecord<BaseUserInfo>, BaseUserInfo> project2 = new Project2RecordList();
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