Why Ajax.NET Professional is using the __type property?
Ajax.NET Professional is using attributes, there is no need to inherit
from special pages or include dummy web controls to do all the job,
there is no need to write special source code. Any .NET assembly can
include classes with AjaxMethods that can be used in your ASP.NET web
application.
Some months ago I had a question from a web developer that is using a
separate assembly for all the business logic (data access layer). He
was using this library in a windows application and want to use it
with ASP.NET and Ajax.NET Professional, too. He simply added the
AjaxMethod attributes, re-compiled it and it was working. The assembly
includes some methods where the client will get a list of Person
instances, see following example:
public class Person
{
public string FirstName;
public int Age;
}
[AjaxMethod]
public static Person GetPersonFromDatabase(int id)
{
return DAL.GetPerson(id);
}
The developer added some more Person classes that inherit from the
common Person class above:
public class MyPerson : Person
{
public string FamilyName;
public DateTime Birthday;
}
And using Ajax.NET Professional he was able to use the returned values
again as argument for following method, which will save the person
data as XML on the web server:
[AjaxMethod]
public static SavePerson(Person p)
{
if( p is MyPerson )
{
// if MyPerson do something here
}
DAL.SavePerson(p); // where DAL.SavePerson accepts Person
}
The big benefit using Ajax.NET Professional is that you will get any
.NET class to the client-side JavaScript code, and that you will be
able to use it as arguments, too.
The same this is working if you are using List<object> or ArrayList
which does not include a type for the items in the list.
Yesterday evening I tried this with Atlas and WebServices, but it was
not working. In debug mode I got the message below when using an
MyPerson instance as argument value for the SavePerson method:
The server method '...' failed with the following error:
System.ArgumentException: The type '...' does not have a public
property of field '...'.
See more examples on how to use .NET data types as return and argument
values at http://munich.schwarz-interactive.de/datatype.aspx.
--
Best regards | Schöne Grüße
Michael
Microsoft MVP - Most Valuable Professional
Microsoft MCAD - Certified Application Developer
http://weblogs.asp.net/mschwarz/
http://www.schwarz-interactive.de/
mailto:[EMAIL PROTECTED]
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