c# - 如何使用 C# 获取本地 Dropbox 文件的共享 URL

Question

我正在使用 DropNet API 检索本地文件的共享链接，但无法通过 GetAccessToken()，因为它为空。

到目前为止，这是我的代码：

var _client = new DropNetClient(APIKEY, APISEC);
_client.GetToken();
var url = _client.BuildAuthorizeUrl();
Process.Start(url);
var accessToken = _client.GetAccessToken();                    
var shareResponse = _client.GetShare("/Getting Started.rtf");
MessageBox.Show(shareResponse.Url);

GetShare() 抛出异常：

System.Reflection.TargetInvocationException

这与我启动浏览器的方式有关，但我已经做了几个小时了，感谢您的帮助！

Answer 1

几个小时后，我终于从 Spring.Social（来自 NuGet）中找到了不错的文档。

这里是：

1. 在此处注册一个新应用程序以链接到您的程序：DropBox / Developer / Apps

2. 安装 NuGet 包 Spring.Social.Dropbox。

3. 使用下面的示例进行连接。

   using Spring.Social.Dropbox.Api;
   using Spring.Social.Dropbox.Connect;
   using Spring.Social.OAuth1;
   
   private void ShareViaDropbox(string[,] filesNameLink)
   {
       try
       {
           if (CheckForInternetConnection()) // cant use dropbox without internet.
           {
               string consumerKey = "<get this from dropbox>";
               string consumerSecret = "<get this from dropbox>";
   
               DropboxServiceProvider dropboxServiceProvider = new DropboxServiceProvider(consumerKey, consumerSecret, AccessLevel.Full);
               IOAuth1Operations oauthOperations = dropboxServiceProvider.OAuthOperations;
   
               // I used an xml file to store the key (probably not the most secure later I will write an encryption).
               string[] storedToken = GetTag("<DropBoxToken>", ",").Split(','); 
               OAuthToken oauthAccessToken = new OAuthToken(storedToken[0], storedToken[1]);
   
               // testing if we got something from the earlier xml tag.
               if (oauthAccessToken.Value == string.Empty || oauthAccessToken.Value == "") 
               {
                   Console.Write("Getting request token...");
                   OAuthToken oauthToken = dropboxServiceProvider.OAuthOperations.FetchRequestTokenAsync(null, null).Result;
                   Console.WriteLine("Done");
                   OAuth1Parameters parameters = new OAuth1Parameters();
                   string authenticateUrl = dropboxServiceProvider.OAuthOperations.BuildAuthorizeUrl(oauthToken.Value, parameters);
   
                   Console.WriteLine("Redirect user for authorization");
   
                   // let the user know they have to sign in and chose the correct dropbox. this is also where most documentation leaves off! 
                   MessageBox.Show(
                       "This is the first time you have connected to DropBox. A browser will open and direct you the the DropBox authentication page. When you prompted, please sign in and then choose the [named] DropBox." + Environment.NewLine +
                       "Once you have succesfully compleaded the authorization confirmation from DropBox, you may close the browser to continue." + Environment.NewLine +
                       Environment.NewLine +
                       "Click 'Ok' to proceed", "DropBox Authentication Required.", MessageBoxButtons.OK, MessageBoxIcon.Information);
                   Process.Start(authenticateUrl);
   
                   // halt the program until the user has authenticated.
                   MessageBox.Show("Click 'OK' when authorization has succeeded.", "DropBox Authentication - WAIT", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                   Console.Write("Press any key when authorization attempt has succeeded");
                   Console.Write("Getting access token...");
                   AuthorizedRequestToken requestToken = new AuthorizedRequestToken(oauthToken, null);
                   oauthAccessToken = dropboxServiceProvider.OAuthOperations.ExchangeForAccessTokenAsync(requestToken, null).Result;
                   Console.WriteLine("Done");
                   ChangeTag("<DropBoxToken>", oauthAccessToken.Value + "," + oauthAccessToken.Secret); // update the xml file with the token.                        
               }
   
               IDropbox dropbox = dropboxServiceProvider.GetApi(oauthAccessToken.Value, oauthAccessToken.Secret);
               DropboxLink shareableLink;
               double filesNameLength = Math.Ceiling(Convert.ToDouble(filesNameLink.Length / 2));
   
               // remove everything before the users special folder path including the dropbbox folder.
               // then change all the switches to front from back for the web.
               for (int i = 0; i < filesNameLength; i++)
               {
                   filesNameLink[i, 1] = filesNameLink[i, 0];
                   filesNameLink[i, 0] = Path.GetFileName(filesNameLink[i, 0]);
                   filesNameLink[i, 1] = filesNameLink[i, 1].Replace(dropboxRootDir, "").Replace("\\", "/");
                   shareableLink = dropbox.GetShareableLinkAsync(filesNameLink[i, 1].Replace("\\", "/")).Result;
                   filesNameLink[i, 1] = shareableLink.Url;
               }
               // do something with the link(s). //
               catch { }
           }
       }
       catch { }
   }