I think what you want is supported, you just got the syntax wrong:

    Public Class ConfigValues
        Implements IAppConfig
        Implements IDatabaseConfig
    
        Public Property ErrorPath As String Implements IAppConfig.ErrorPath
    
        Public Property Server As String Implements IAppConfig.Server, 
                                                    IDatabaseConfig.Server
    
    End Class

On startup, I load all my app.config values into a class named `ConfigValues`.  My database only needs some of them so I have an `IDatabaseConfig` interface that specifies just the parameters that it needs.  That way, when I'm creating a database connection class, with constructor injection, I can require that it is passed anything that implements `IDatabaseConfig`.  

What I'd like to do is declare multiple interfaces on the `ConfigValues` class and allow some of the properties to implement multiple contracts simultaneously.

Here's a small code example:



    Public Interface IAppConfig
        Property Server As String
        Property ErrorPath As String
    End Interface
    
    Public Interface IDatabaseConfig
        Property Server As String
    End Interface
    
    Public Class ConfigValues
        Implements IAppConfig
        Implements IDatabaseConfig
    
        Public Property ErrorPath As String Implements IAppConfig.ErrorPath

        'need different syntax - does not compile:
        Public Property Server As String Implements IAppConfig.Server, 
                                         Implements IDatabaseConfig.Server
    
    End Class

In VB.NET, is there a way to specify that a single property satisfies the contract for multiple interfaces?

This is the exact opposite of these two questions on SO, which are trying to split up the same interface name into two different properties.

* [Implementing 2 Interfaces with 'Same Name' Properties](https://stackoverflow.com/q/532148/1366033)
* [How to implement an interface in VB.Net when two methods have the same name but different parameters](https://stackoverflow.com/q/2372726/1366033)

----

As a cludgy workaround, I could have both properties refer to the same backing property, but I'd have to change the property name on at least one of them, which changes the API.



    Private _server As String
    Public Property ServerForApp As String Implements IAppConfig.Server
        Get
            Return _server
        End Get
        Set(value As String)
            _server = value
        End Set
    End Property
    Public Property ServerForDatabase As String Implements IDatabaseConfig.Server
        Get
            Return _server
        End Get
        Set(value As String)
            _server = value
        End Set
    End Property