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Editorial Team
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Asked: 2026-05-22T20:00:54+00:00

I am working in c# 4.0 to read a signed request I am using

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I am working in c# 4.0 to read a signed request I am using the following code

FacebookApp fap = new FacebookApp();
fap.AppId = "789485219211963"; // App ID
fap.AppSecret = "365ee9f5823698536767d608cf572a49"; 

string requested_Data = Request.Form["signed_request"];
FacebookSignedRequest fsr = fap.ParseSignedRequest(requested_Data);
IDictionary<string, string> myDic = fsr.Dictionary;

string name = myDic["name"];
string algorithm = myDic["algorithm"];

Response.Write(requested_Data + "<br>" + algorithm + "<br>" + name + "<br>");

But on the highlighted line I received following exception

Could not load file or assembly
‘Newtonsoft.Json, Version=3.5.0.0,
Culture=neutral,
PublicKeyToken=30ad4fe6b2a6aeed’ or
one of its dependencies. The located
assembly’s manifest definition does
not match the assembly reference.
(Exception from HRESULT: 0x80131040)

I downloaded Newtonsoft.Json. release 1 instead of release 2 but it still not working.
Can someone kindly help me to solve this problem, also please guide me either my way of reading signed request is correct or not if not please specify the correct way.

Thanks:

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1 Answer

  1. Editorial Team

    I’m guessing you donwloaded Newtonsoft.Json v4.0, not 3.5. Last version of 3.5 is release 8.

    http://json.codeplex.com/releases/view/50552

    I guess that you might be able to do a version forward in your web.config/app.config in order to use 4.0 instead of 3.5, because some library you are using is probably built against the 3.5 version of Newtonsoft.

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