How to pass parameter to function on pub/sub using nettcpbinding

Question

i am newbie to nettcpbinding callback function,

i have scenario where i need to get the result based on the parameter pass ex. messageId and get the result data when publisher publised based on messageId to the subscribe client.

Thanks,

Answer 1

You can do this with the KnownType attribute.

Your result classes have to inherit from a base class which is decorated with all the possible derived classes:

[KnownType( typeof( ResultClassOne ) )]
[KnownType( typeof( ResultClassTwo ) )]
class ResultBase
{
  public int MessageId { get; set; }
}

class ResultClassOne : ResultBase
{
  ... other properties
}

class ResultClassTwo : ResultBase
{
  ... other properties
}

This will allow all derived classes to be serialized properly.

Then use the base class in your contract interface:

ResultBase Method( int messageId )

And in the implementation, pass back instances of the correct derived class:

public ResultBase Method( int messageId )
{
  if ( messageId == 1 ) return new ResultClassOne();
  ...