C - Multiple generic types in one list

Question

This is probably not possible  but I have this class   public class Metadata lt DataType gt  where DataType   struct       private DataType mDataType      There s more to it  but let s keep it simple   The generic type  DataType  is limited to value types by the where statement   What I want to do is have a list of these Metadata objects of varying types  DataType    Such as   List lt Metadata gt  metadataObjects  metadataObjects Add new Metadata lt int gt      metadataObjects Add new Metadata lt bool gt      metadataObjects Add new Metadata lt double gt        Is this even possible

User · Accepted Answer

public abstract class Metadata         extend abstract Metadata class public class Metadata lt DataType gt    Metadata where DataType   struct       private DataType mDataType

User · Answer

Following leppie s answer  why not make MetaData an interface   public interface IMetaData      public class Metadata lt DataType gt    IMetaData where DataType   struct       private DataType mDataType

User · Answer

Following leppie s answer  why not make MetaData an interface   public interface IMetaData      public class Metadata lt DataType gt    IMetaData where DataType   struct       private DataType mDataType

User · Answer

I have also used a non-generic version  using the new keyword   public interface IMetadata       Type DataType   get         object Data   get       public interface IMetadata lt TData gt    IMetadata       new TData Data   get        Explicit interface implementation is used to allow both Data members   public class Metadata lt TData gt    IMetadata lt TData gt        public Metadata TData data               Data   data             public Type DataType               get   return typeof TData                object IMetadata Data               get   return Data               public TData Data   get  private set        You could derive a version targeting value types   public interface IValueTypeMetadata   IMetadata       public interface IValueTypeMetadata lt TData gt    IMetadata lt TData gt   IValueTypeMetadata where TData   struct       public class ValueTypeMetadata lt TData gt    Metadata lt TData gt   IValueTypeMetadata lt TData gt  where TData   struct       public ValueTypeMetadata TData data    base data             This can be extended to any kind of generic constraints

User · Answer

I have also used a non-generic version  using the new keyword   public interface IMetadata       Type DataType   get         object Data   get       public interface IMetadata lt TData gt    IMetadata       new TData Data   get        Explicit interface implementation is used to allow both Data members   public class Metadata lt TData gt    IMetadata lt TData gt        public Metadata TData data               Data   data             public Type DataType               get   return typeof TData                object IMetadata Data               get   return Data               public TData Data   get  private set        You could derive a version targeting value types   public interface IValueTypeMetadata   IMetadata       public interface IValueTypeMetadata lt TData gt    IMetadata lt TData gt   IValueTypeMetadata where TData   struct       public class ValueTypeMetadata lt TData gt    Metadata lt TData gt   IValueTypeMetadata lt TData gt  where TData   struct       public ValueTypeMetadata TData data    base data             This can be extended to any kind of generic constraints

User · Answer

Following leppie s answer  why not make MetaData an interface   public interface IMetaData      public class Metadata lt DataType gt    IMetaData where DataType   struct       private DataType mDataType

User · Answer

Following leppie s answer  why not make MetaData an interface   public interface IMetaData      public class Metadata lt DataType gt    IMetaData where DataType   struct       private DataType mDataType

User · Answer

I have also used a non-generic version  using the new keyword   public interface IMetadata       Type DataType   get         object Data   get       public interface IMetadata lt TData gt    IMetadata       new TData Data   get        Explicit interface implementation is used to allow both Data members   public class Metadata lt TData gt    IMetadata lt TData gt        public Metadata TData data               Data   data             public Type DataType               get   return typeof TData                object IMetadata Data               get   return Data               public TData Data   get  private set        You could derive a version targeting value types   public interface IValueTypeMetadata   IMetadata       public interface IValueTypeMetadata lt TData gt    IMetadata lt TData gt   IValueTypeMetadata where TData   struct       public class ValueTypeMetadata lt TData gt    Metadata lt TData gt   IValueTypeMetadata lt TData gt  where TData   struct       public ValueTypeMetadata TData data    base data             This can be extended to any kind of generic constraints

User · Answer

I have also used a non-generic version  using the new keyword   public interface IMetadata       Type DataType   get         object Data   get       public interface IMetadata lt TData gt    IMetadata       new TData Data   get        Explicit interface implementation is used to allow both Data members   public class Metadata lt TData gt    IMetadata lt TData gt        public Metadata TData data               Data   data             public Type DataType               get   return typeof TData                object IMetadata Data               get   return Data               public TData Data   get  private set        You could derive a version targeting value types   public interface IValueTypeMetadata   IMetadata       public interface IValueTypeMetadata lt TData gt    IMetadata lt TData gt   IValueTypeMetadata where TData   struct       public class ValueTypeMetadata lt TData gt    Metadata lt TData gt   IValueTypeMetadata lt TData gt  where TData   struct       public ValueTypeMetadata TData data    base data             This can be extended to any kind of generic constraints

[c#] C# - Multiple generic types in one list

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