c# - 如何为 DotNetOpenAuth 编写 VB 或 C# GUI 客户端？

Question

我正在学习如何使用 Google Calendar API，这反过来要求我学习如何使用 DotNetOpenAuth 访问 Google 帐户。我使提供的示例正常工作，并在控制台程序中编写了工作代码以访问和操作日历。

我现在想编写一个 Windows 窗体应用程序(用 C# 或 VB)来做同样的事情。我无法使 OAuth2 进程在 GUI 应用程序中工作。它编译并运行，但不起作用。根据目前所见，我得出的结论是未调用 GetAuthorization() 函数。

我已经尝试从单击按钮、从构造函数和从表单加载程序方法开始该过程。我在 C# 和 VB 中都试过。

public GoogleCal()
{
    InitializeComponent();

    var provider = new NativeApplicationClient(
                           GoogleAuthenticationServer.Description);
    provider.ClientIdentifier = "xxxxx.apps.googleusercontent.com";
    provider.ClientSecret = "yyyyy";

    var auth = new OAuth2Authenticator<NativeApplicationClient>(
                       provider, GetAuthorization);
}

private IAuthorizationState GetAuthorization(NativeApplicationClient arg)
{
    // Get the auth URL:
    IAuthorizationState state = new AuthorizationState(new[] {
                               CalendarService.Scopes.Calendar.GetStringValue() });

    state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
    Uri authUri = arg.RequestUserAuthorization(state);

    // Request authorization from the user (by opening a browser window):
    Process.Start(authUri.ToString());
    authCodeText = Microsoft.VisualBasic.Interaction.InputBox(
                                                   "Paste code:", "title", "");

    // Retrieve the access token by using the authorization code:
    return arg.ProcessUserAuthorization(authCodeText, state);
}

我显然做错了什么，但我无法弄清楚它是什么。有什么想法吗？

Answer 1

使用 whelkaholism.blogspot 上的教程，我能够做我想做的事。我采用了一种稍微不同的方法(部分是为了使用更新的 OAuth2)。

我的C#窗体程序代码如下。

// Add references:
//      DotNetOpenAuth.dll
//      Google.Apis.dll
//      Google.Apis.Authentication.OAth2.dll
//      Newtonsoft.Json.Net35.dll
// plus, add references for whichever Google App(s) you want
//      Google.Apis.Calendar.v3.dll

// form contains at least the following:
//      button1: Button, start the authentication process
//      authCode: TextBox, to recive the auth code from Google
//      button2: Button, complete the authentication prop
//      textBox2: TextBox, multi-line, to display status message and output

// in addition to the libraries required for any forms program, use:
using System.Diagnostics;
using DotNetOpenAuth.OAuth2;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Util;


// methods not related to authentication deleted for space

namespace GoogleCal
{
    public partial class GoogleCal : Form
    {
        private static String NL = Environment.NewLine;
        private static IAuthorizationState state;
        private static NativeApplicationClient provider;
        private static OAuth2Authenticator<NativeApplicationClient> auth;
        private static CalendarService calService;

        private void button1_Click(object sender, EventArgs e)
        {
            // clicked to initiate authentication process

            // provider and state are declared above as private static

            provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);
            provider.ClientIdentifier = "<my id>.apps.googleusercontent.com";
            provider.ClientSecret = "<my secret>";

            // next line changes if you want to access something other than Calendar
            state = new AuthorizationState(new[] { CalendarService.Scopes.Calendar.GetStringValue() });
            state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
            Uri authUri = provider.RequestUserAuthorization(state);

            Process.Start(authUri.ToString());
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // clicked after Google code is pasted into TextBox to complete authentication process

            // auth and calService are declared above as private static

            auth = new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);

            // create the service object to use in other methods
            calService = new CalendarService(auth);

            textBox2.AppendText("Ready" + NL);
            textBox2.Update();
        }

        private IAuthorizationState GetAuthorization(NativeApplicationClient arg)
        {
            // state is declared above as private static
            // authCode is a TextBox on the form
            return arg.ProcessUserAuthorization(authCode.Text, state);
        }
    }
}