RIA SERVICES

Question

Hi

I am new in silverlight i am using silverlight with RIA Services.

In DomainService class i created method named GetUserByID(int UserID) it's returning User class object.

i want to know on which metho i have to set the Invoke or Query.

What is the difference in Invoke and Query.

Also i have seen when at acess time to method i have to sent the compleate Method refrence but some time not need for that. i want to know what is the reason behind that.

Thanks

Arun Tyagi

Answer 1

The following link will help you:

http://msdn.microsoft.com/en-us/library/ee707373(v=vs.91).aspx

Answer 2

Hi Arun,

Since you are returning a single User entity, Query suits this situation.

Invoke is only used when Query, update, delete or insert cannot be used. Especially when return an non-entity data.

 

Best Regards,

Answer 3

Hi,

Thanks for reply..

yes i am satisfied with you but in my service i am using

 <Invoke()> _
    Public Function User_Authenticate(ByVal userId As String, ByVal password As String) As LoginStatus
        Dim loginStatus As New LoginStatus
        Try
            loginStatus.UserName = userId
            If Not Membership.ValidateUser(userId, password) Then
                If Membership.FindUsersByName(userId).Count > 0 Then

                End If
            End If
        Catch ex As Exception

        End Try
        Return loginStatus
    End Function

it's not working given error-:

  Operation named 'User_Authenticate' does not conform to the required signature. Return types must be an entity, collection of entities, or one of the predefined serializable types. 

But in other servies code it's working i want to know about that.

Thanks

Arun Tyagi