Abstract class unable to implement List<T>

[MAHESA]

Hello friends,
I recently started learning C# language. In one of my program I tried to use abstract class, where this class has to implement a list of T. But I am getting problem in it. I don't know why Abstarct class unable to implement List<T>. Please help me to fix this problem. For your information I have written following code for you.

public class AbstractClassEg
{
    public int Ids { get; set; }
    public int Names { get; set; }

    public abstract List<T> Items { get; set; }
}

public class Containers : AbstractClassEg
{
    public Lists<Widgetss> Itemss { get; set; }
}

[Praetor]

You must have declaration on the class to know what type T is in the list. To do this you have to use following code in your program to fix this problem.

public abstract class AbstractClassEg<T>
{
    public int Ids { get; set; }
    public int Names { get; set; }

    public abstract List<T> Itemss { get; set; }
}

public class Containers : AbstractClass<Widgets>
{
    public List<Widgetss> Items s{ get; set; }
}

You can also specify type of T using following code:

public class AbstractClassEg<T> wheres T : IWidgetss

[Katty]

As per my information you have written wrong code and that's why you are getting such type of problem. In this case you have to make AbstractClass generic to fix this problem. You can do this in following ways.

public class AbstractClassEg<T> {
  ...
}

public class Containers : AbstractClassEg<Widgets> { ...
}

In above code I have use AbstractClassEg in containers.

[kelfro]

You have to use following steps to implement List<T>.
1.First you have to declare the type T.
2.After this you have to define the class AbstractClass as abstract.
3.After this you have to use the override keyword.

public class Widgets { }

public abstract class AbstractClass<T>
{
    public int Ids { get; set; }
    public int Names { get; set; }

    public abstract List<Ts> Itemss { get; set; }
}

public class Containers : AbstractClassEg<Widgets>
{
    public overrides Lists<Widgets> Items s{ get; set; }
}

[Zecho]

To fix this problem you have to specify the type in the abstract class. You can use following code to do this. In the following code I have use GET and SET methods to take input form the user and assign this value to another variable.

public class AbstractClasssEgs<T>
{
    public int Ids1 { get; set; }
    public int Namess1 { get; set; }

    public abstract List<T> Itemss1 { get; set; }
}

public class Containers1 : AbstractClasssEgs<Widgets>
{
    public List<Widgetss1> Itemss1 { get; set; }
}

[absolute55]

As per my information you have to use following steps to fix this problem.
First you have to mark AbstractClass abstract -> after this you have to declare the generic type in the AbstractClass declaration -> Now you have to implement abstract property with override methods.

public abstract class AbstractClasssEgs<T>
{
    public int Idss { get; set; }
    public int Namess { get; set; }

    public abstractss List<T> Items { get; set; }
}

public class Containerss : AbstractClassEgss<Widgets>
{
    public overridess List<Widgets> Itemss { get; set; }
}