Facebook C# SDK - .NET 3.5 & Dynamic objects

Question

I have downloaded the Graph C# SDK for facebook, the examples are very helpful and easy to understand however i come unstuck when trying to use the dynamic object type as the return object for a FacebookApp.Get("me") call.

I'v never used dynamics before so i did a bit of reasearch and it seems they are new to Visual Studio 2010, which is the version i am using but i cant use the latest framework because of my production environment...

Is there a type i can use instead or is there a different way to go about this using the 3.5 framework? here is an example from the source files provided with the binary for the framework.

dynamic myInfo = app.Get("me");
lblTitle.Text = myInfo.name;

I get an error stating that i may be missing an assembely reference for type dynamic.

Any and all help is greatly apreciated! looking forward to getting to grips with this SDK!!

I'm glad you asked the question because I'm looking for a way to use the sdk from .net 3.5 also (they include a 3.5 folder so I think it should work). Here's my question stackoverflow.com/questions/4675364 Keep an eye on it. Between the two of us maybe somebody will answer one of our questions. — John K
– John K, Commented Jan 14, 2011 at 4:35

RidingTheRails · Accepted Answer · 2012-01-25 17:48:07Z

5

If you want strongly typed objects there is a very easy way to do that. See here: https://gist.github.com/906471

var fb = new FacebookClient("access_token");

var result = fb.Get<FBUser>("/me");

string name = result.Name;

MessageBox.Show("Hi " + name);

[DataContract]
public class FBUser {
   [DataMember(Name="name")]
   public string Name { get; set; }
   [DataMember(Name="first_name")]
   public string FirstName { get; set; }
}

edited Jan 25, 2012 at 17:48

RidingTheRails

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answered Apr 6, 2011 at 20:37

Nate Totten

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Comments

prabir · Accepted Answer · 2011-02-09 07:09:49Z

4

You might want to look at this article http://blog.prabir.me/post/Facebook-CSharp-SDK-Writing-your-first-Facebook-Application.aspx

var fb = new FacebookClient("access_token");

var result = (IDictionary<string, object>)fb.Get("/me");
var name = (string)result["name"];

MessageBox.Show("Hi " + name);

You will need to cast it to IDictionary<string, object>

answered Feb 9, 2011 at 7:09

prabir

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Comments

yamspog · Accepted Answer · 2011-04-01 17:09:24Z

Building on some of the other answers here, the dynamic objects are really JSON objects that are returned from the facebook api. The SDK uses dynamic type to create a nicer interface to the underlying data.

I didn't like the idea of casting the objects to IDictionary each time so I took it a step further and created a facade object that provides a strongly-typed access method to the data.

public class FBPerson : FBBase
{
    #region constructor
    public FBPerson(object personObject)
        : base(personObject)
    {
    }
    #endregion

    #region Properties
    public string first_name
    {
        get { return ExtractValueAsString("first_name"); }
    }
    public string last_name
    {
        get { return ExtractValueAsString("last_name"); }
    }
    public string name
    {
        get { return ExtractValueAsString("name"); }
    }
    public string email
    {
        get { return ExtractValueAsString("email"); }
    }
    public string id
    {
        get { return ExtractValueAsString("id"); }
    }
    public string link
    {
        get { return ExtractValueAsString("link"); }
    }
    public string username
    {
        get { return ExtractValueAsString("username"); }
    }
    public string location
    {
        get { return ExtractValueAsString("location"); }
    }
    public string gender
    {
        get { return ExtractValueAsString("gender"); }
    }
    public string timezone
    {
        get { return ExtractValueAsString("timezone"); }
    }
    public string locale
    {
        get { return ExtractValueAsString("locale"); }
    }
    public string verified
    {
        get { return ExtractValueAsString("verified"); }
    }
    public string updated_time
    {
        get { return ExtractValueAsString("updated_time"); }
    }
    #endregion

}

And the base class (so you can create facades for other SDK objects)...

public class FBBase
{
    private IDictionary<string, object> fbCollection = null;
    public FBBase(object collection)
    {
        fbCollection = (IDictionary<string, object>)collection;
    }

    protected string ExtractValueAsString(string value)
    {
        Validate();
        return fbCollection[value].ToString();
    }
    protected void Validate()
    {
        if (fbCollection == null)
        {
            throw new InvalidOperationException("null collection object");
        }
    }
}

There is a much easier way to do this. See my answer: stackoverflow.com/questions/4674669/…

Michel · Accepted Answer · 2011-01-12 22:34:02Z

-1

dynamic is C# 4.0 .Net 4.0 not .Net 3.5

answered Jan 12, 2011 at 22:34

Michel

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6 Comments

Jarmez De La Rocha Over a year ago

I thought so, im not sure of how i can acheieve the same result within the limits of the 3.5 framework? can anyone point me in the right direction?

Michel Over a year ago

You will need reflection ; have a look at this : stackoverflow.com/questions/2135533/…

Jarmez De La Rocha Over a year ago

No ideas anyone? surly sombody must be using this with .net 3.5? Thanks!

John K Over a year ago

I was afraid that reflection might be the answer. Maybe I'll just have get 4.0 installed on our production environment instead.

Jarmez De La Rocha Over a year ago

Reflection goes over my head.... I dont understand why the SDK cant just drop the collection to a known type? or a key/value pair? I really cant upgrade to 4.0!!

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