Fetch Document From SharePoint And Save Locally

Here I am explaining to get document list from SharePoint and save on local directory.

Now I am creating a web api to get document from SharePoint and save on local machine.

//to save file on local system from sharepoint server.
[Route("~/api/Insight/DownloadDocument")]
[System.Web.Http.HttpGet]
public async Task<HttpResponseMessage> DownloadDocument()
{
try
{
string fedAuthString = null;
var headers = Request.Headers;
if (headers.Contains("SPOIDCRL"))
{
fedAuthString = headers.GetValues("SPOIDCRL").First();
}
// fedAuthString = "Sharepoint url to get Document (api)";
//InfraAndComm document
string InfraAndCommInsightPath = System.Web.Hosting.HostingEnvironment.MapPath("~/IndustryDocument/InfraAndComm/");
string InfraAndCommInsightsUrl = "Sharepoint url to get Document (api)";
DocumentResult.DownloadDocument(fedAuthString, InfraAndCommInsightPath, InfraAndCommInsightsUrl);
return Request.CreateResponse(HttpStatusCode.OK, " All insight document downloaded successfully!!!");
}
catch (Exception ex)
{
return Request.CreateResponse(HttpStatusCode.OK, "Something wrong !!! please try again");
}
}

SPOIDCRL is a user token to valid user.

//Download Document from sharepoint server and store in Application folder..
public async void DownloadDocument(string fedAuthString, string DocumentPath,string insightUrl)
{
string baseurl1= WebConfigurationManager.AppSettings["InsightUrl"].ToString(); //Base url/realtiveURL
string baseurl = WebConfigurationManager.AppSettings["InsightBaseUrl"].ToString(); //Base URL
Core.Model.Results rs = new Core.Model.Results();
Uri uri = new Uri(baseurl1);
string industryInsightsUrl = uri + insightUrl;
var cookieContainer = new CookieContainer();
cookieContainer.Add(uri, new Cookie("SPOIDCRL", fedAuthString));
HttpClientHandler handler = new HttpClientHandler();
handler.CookieContainer = cookieContainer;
HttpClient _client = new HttpClient(handler);
CancellationToken ct;
TimeSpan? timeout = null;
if (timeout.HasValue)
_client.Timeout = timeout.Value;
ct.ThrowIfCancellationRequested();
_client.DefaultRequestHeaders.Add("Accept", @"application / json; odata = verbose");
var resp = await _client.GetAsync(industryInsightsUrl);
var result = resp.Content.ReadAsStringAsync().Result;
// return Request.CreateResponse(HttpStatusCode.OK, result);
//to desrilize json
var obj = JsonConvert.DeserializeObject<RootValue>(result).d;
List<InsightsReturn> InsightFinalList = new List<InsightsReturn>();
//for file data
if (obj.Files.results.Count > 0)
{
foreach (var FileData in obj.Files.results)
{
/////////////////////////////type code to find your data.
}
}
}

I am attaching zip file, you can see whole code whatever I've done.