CMS365.FacebookSharp 6.17.4

FacebookSharp: A .NET library for Facebook Graph API.

FacebookSharp is a .NET library that enables you to authenticate and make graph API calls to Facebook. It's used for posting feeds and contents on Facebook using C# and .NET

Installation

FacebookSharp is available on NuGet. Use the package manager console in Visual Studio to install it:

Install-Package CMS365.FacebookSharp

API support

FacebookSharp currently supports the following Facebook Graph APIs:

• Getting started
  • Creating an app
• Access & Security
  • Getting the access token.
• Using the FacebookSharp
  • Using the FacebookSharp.

Creating an App

Please visit https://developers.facebook.com/apps and create an app.

Authorization and authentication

Please visit https://developers.facebook.com/tools/explorer/ and generate a user token.

You can adjust permissions based on your needs. This is a short lived token and can be used for Facebook Graph api for user level operations. We will use it to generate a long live user token.

User postman and send a request to the following endpoint and get a long lived user token.

https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id=APP_CLIENT_ID&client_secret=APP_CLIENT_SECRET&fb_exchange_token=YOUR_SHORT_LIVED_USER_TOKEN_HERE

You will get a response like

{
    "access_token": "vMF7UXNvRZC6m58zr0tRQJP3MVCZBd6JDhHkyCXjWcfag8hfcmjImn85B2YPZAUYK4eirj9ZA0ZAsp1TocZD",
    "token_type": "bearer",
    "expires_in": 5182228
}

We will get an access_token which is along lives user token and can be used for Facebook Graph api for user level operations but we to generate a page token so that we can perform action on a Facebook page.

https://graph.facebook.com/FACEBOOK_PAGE_ID?fields=access_token&access_token=LONG_LIVED_USER_TOKEN

{
    "access_token": "EAASZAbmgGb7YBAFWM3uNUKan1ZBTf4rIAQiLzPSNMa7Lm3Ak1R8tNAVwsORl0LZAcPNEURzFgl6",
    "id": "111444904022049"
}

We have now got a page token which we will use to perform action on a Facebook page.

Using the FacebookSharp

Initialize the instance with the page token

var facebookController = new FacebookSharp.FacebookController("EAASZAbmgGb7YBAFWM3uNUKan1ZBTf4rIAQiLzPSNMa7Lm3Ak1R8tNAVwsORl0LZAcPNEURzFgl6");

Page

Get page details

var pageDetail = await facebookController.GetPageDetailsAsync("[PAGE_ID]");

You can also pass page fields you want to get, list of fields applicable to a page is available at https://developers.facebook.com/docs/graph-api/reference/page/

Get page details

var pageDetail = await facebookController.GetPageDetailsAsync("[PAGE_ID]","name,about,link,cover");

Post with multiline text and images

var postDetails = await facebookController.PostFeedAsync("[PAGE_ID]", new FacebookSharp.Entities.PageFeedRequestContent()
{
    MessageLines = new List<string>() { "Loose Mineral Foundation Shade", "https://google.com","$20" },
    PhotoUrls= new List<string>() { "https://cdn.pixabay.com/photo/2017/09/01/00/15/png-2702691_640.png" }
});