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POHow to post to a facebook wall from silverlight application
 

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  1. POHow to post to a facebook wall from silverlight application
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    <p>I am using the facebook c#-sdk v5.0.50.0. Users of my silverlight application want an option to post information generated by my software onto their facebook wall.</p> <p>I think the SilverlightInBrowser sample in the SDK is the closest example of what I need in that it prompts the user for permission and also reads user information. I have got that part functioning OK (but do link to any fully working example you know of). </p> <p>The sample app uses</p> <pre><code>private string[] requestedFbPermissions = new[] { "user_about_me" }; </code></pre> <p>I presume I will have to change that to enable posting to the wall, to one of the permissions listed here - <a href="http://developers.facebook.com/docs/reference/api/permissions/" rel="nofollow">http://developers.facebook.com/docs/reference/api/permissions/</a> probably "publish_stream" would be my guess, which I can't test until I get the posting bit working.</p> <p>The next step is to write the post. I have not seen a silverlight version of this, so I have adapted slightly an answer to a non-silverlight question, as silverlight is slightly different (e.g. async callbacks). My code looks like so:</p> <pre><code> private void fbpost_Click2(object sender, RoutedEventArgs e) { var client = new FacebookClient(fb.AccessToken); dynamic parameters = new ExpandoObject(); parameters.message = "test posting - ignore"; parameters.link = "http://www.example.com/link"; parameters.picture = "http://www.example.com/picture.jpg"; parameters.name = "Test Post"; parameters.caption = "Test Post Caption"; parameters.description = "description here"; parameters.actions = new { name = "View on www.example.com", link = "http://www.example.com", }; parameters.privacy = new { value = "ALL_FRIENDS", }; parameters.targeting = new { countries = "US", regions = "6,53", locales = "6", }; client.PostCompleted += new EventHandler&lt;FacebookApiEventArgs&gt;(client_PostCompleted); client.PostAsync("me/feed", parameters); } void client_PostCompleted(object sender, FacebookApiEventArgs e) { dynamic result = e.GetResultData(); } </code></pre> <p>However what happens is I get an error calling <code>client.PostAsync("me/feed", parameters);</code></p> <p>Attempt by security transparent method 'SimpleJson.Reflection.CacheResolver.CreateDynamicMethod(System.String, System.Type, System.Type[], System.Type)' to access security critical method 'System.Reflection.Emit.DynamicMethod..ctor(System.String, System.Type, System.Type[], System.Type, Boolean)' failed.</p>
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    1. COThanks. I believe I have the latest source (from the latest .zip) on the SDK website. I made that edit (tried 4 times) incremented the version number from 5.0.50.0 to 5.0.53.0 to ensure I got the new dll, and now I get a different error on line 1597 of SimpleJson.cs, the line is `return delegate(object instance) { return getMethodInfo.Invoke(instance, Type.EmptyTypes); };` and the error is `Attempt by method 'SimpleJson.Reflection.CacheResolver+<>c__DisplayClassa.<CreateGetHandler>b__9(System.Object)' to access method '<>f__AnonymousType0`2<System.__Canon,System.__Canon>.get_name()' failed.`
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