In Part 1 of this post we created our SharePoint add-in and added permissions to it. We now can start using the SharePoint Online API.
With using PnP Framework library
Add the PnP Framework library nuget package to use the below code: https://www.nuget.org/packages/PnP.Framework
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| string siteUrl = "https://contoso.sharepoint.com/sites/demo"; | |
| using (var cc = new AuthenticationManager().GetACSAppOnlyContext(siteUrl, "[Your Client ID]", "[Your Client Secret]")) | |
| { | |
| cc.Load(cc.Web, p => p.Title); | |
| cc.ExecuteQuery(); | |
| Console.WriteLine(cc.Web.Title); | |
| }; |
With using Postman
| appReg_clientId | Your SharePoint add-in Client ID |
| realm | Your SharePoint Tenant ID |
| principal | 00000003-0000-0ff1-ce00-000000000000 |
| targetHost | <domain_name>.sharepoint.com |
With using .NET
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| private static void GetAccessToken() | |
| { | |
| try | |
| { | |
| SHAREPOINT_TOKEN = string.Empty; | |
| WebRequest request = WebRequest.Create("https://accounts.accesscontrol.windows.net/" + TENANT_ID + "/tokens/OAuth/2"); | |
| request.Method = "POST"; | |
| string postData = "grant_type=client_credentials" + | |
| "&client_id=" + WebUtility.UrlEncode(CLIENT_ID + "@" + TENANT_ID) + | |
| "&client_secret=" + WebUtility.UrlEncode(CLIENT_SECRET) + | |
| "&resource=" + WebUtility.UrlEncode(SHAREPOINT_RESOURCE_ID + "/" + SHAREPOINT_DOMAIN + "@" + TENANT_ID); | |
| _logger.LogInformation($"postData: {postData} "); | |
| _logger.LogInformation("GetBytes: postData "); | |
| byte[] byteArray = Encoding.UTF8.GetBytes(postData); | |
| request.ContentType = "application/x-www-form-urlencoded"; | |
| request.ContentLength = byteArray.Length; | |
| _logger.LogInformation("GetRequestStream: request "); | |
| Stream dataStream = request.GetRequestStream(); | |
| dataStream.Write(byteArray, 0, byteArray.Length); | |
| dataStream.Close(); | |
| _logger.LogInformation("Calling: request.GetResponse "); | |
| using WebResponse response = request.GetResponse(); | |
| _logger.LogInformation("GetResponseStream: response "); | |
| dataStream = response.GetResponseStream(); | |
| StreamReader reader = new StreamReader(dataStream); | |
| string responseFromServer = reader.ReadToEnd(); | |
| reader.Close(); | |
| dataStream.Close(); | |
| _logger.LogInformation($"responseFromServer: {responseFromServer} "); | |
| const string accessToken = "access_token\":\""; | |
| int clientIndex = responseFromServer.IndexOf(accessToken, StringComparison.Ordinal); | |
| int accessTokenIndex = clientIndex + accessToken.Length; | |
| SHAREPOINT_TOKEN = responseFromServer.Substring(accessTokenIndex, (responseFromServer.Length – accessTokenIndex – 2)); | |
| } | |
| catch (Exception ex) | |
| { | |
| _logger.LogError(ex.Message); | |
| throw; | |
| } | |
| } |
Crm Minds 
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