Question

I have a problem while adding a new class in my existing structure. I am going to explain my problem as much clear as i can

public interface Imust
{
    string Name { get; set; }
    string File { get; set; }
    string RowKey { get; set; }
    string Time { get; set; }
    string PartitionKey { get; set; }
}

public class TA : TableServiceEntity, Imust
{
    public string Time { get; set; }
    public string Name { get; set; }
    public string File { get; set; }
}

public class TB : TableServiceEntity, Imust
{
    public string Time { get; set; }
    public string Name { get; set; }
    public string File { get; set; }
}

public class TC : TableServiceEntity, Imust
{
    public string Time { get; set; }
    public string Name { get; set; }
    public string File { get; set; }
}    

public class _Table <T> : _Account where T : Imust 
{
}

Here the above 3 classes are implemented as Tables and its properties as its columns in my project. Imust interface is implemented in each class because in generic class i put an interface constraint. TableServiceEntity class contains the implementation for RowKey and PartitionKey.And this class is also inherited in all 3 entities.

Problem : Now i have to add a new table in my application. So for this i have to add a new class here which is

public class TD : TableServiceEntity
{

}    

I do not want this class to implement the Imust interface because it does not contain these columns. But i have to pass it as a parameter in generic class _Table.Because this new class has different columns but it perform same function which other 3 entities does. Now how will i add this new class while maintaining my existing structur ?

Please suggest me any better solution for this problem ?

EDIT

Yes i can put a constraint TableServiceEntity as a base class. But in generic class _Table there are few function which operate on File property like

    public T AccessEntity(string Id = "0", string File = "0")
    {
        return (from e in ServiceContext.CreateQuery<T>(TableName)
                where e.RowKey == Id || e.File == File
                select e).FirstOrDefault();
    }

If i removed this interface constraint then it shows an error that T does not have a defination for File.

Answer 1

Updated to reflect posters additional info:

You need to specify a new Interface:

public interface IMust2 {
    public string File {get;set;}
    public string Rowkey {get;set;

}

Modify IMust to inherit from IMust2

public interface IMust : IMust2 
{
   public string Name {get;set;}
   public string Time {get;set;}
   public string PartitoinKey {get;set;}
}