Question

I have a method in my web service which returns a DataView,

I have setup a proxy which talks to this service but when i make this method in the proxy

public DataView GetSales(DateTime SalesDate)
{
    ServiceClient client = new ServiceClient();
    return client.GetSalesForDay(SalesDate);             
}

I get the error “Cannot implicitly convert type ‘object[]’ to ‘System.Data.DataView’, i have tried googling this but not getting anywhere, any help would be much appreciated.

Thanks

Answer 1

You can’t do this – you cannot and should not return something like a DataView from a WCF service ever. A WCF service would only ever return data – not objects with behavior (DataView contains a lot of behavior – sorting, filtering, etc.).

Instead, in your service code, do this:

• query your database with a SqlDataReader
• parse out the relevant info you really need (only those fields you’re really interested in) into DTO’s (Data Transfer Objects) – basically just plain objects holding nothing but the properties of a “sale” that are important to you
• return a List from your WCF service

Instead of doing steps 1 and 2 yourself, you could also use Linq-to-SQL, NHibernate, or any other capable ORM to handle that conversion from row/columns in the database to an object for you.