Google 日历 是一种日程安排服务，可让您创建和跟踪会议等活动。您可以在日历上记录事件并获得有关即将发生的事件的提醒。 Google 还允许您以编程方式使用其日历服务。因此，您可以在应用程序中使用 Google 日历管理您的活动。在本文中，您将学习如何在 C# 中创建、更新和删除 Google 日历。
用于创建和更新 Google 日历的 C# API - 免费下载
为了使用 Google 日历服务，我们将使用 Aspose.Email for .NET。它是一个强大的 API，提供了一系列用于处理电子邮件、与电子邮件客户端合作以及使用 Google 的协作服务的功能。您可以 下载 API 的 DLL 或使用以下命令从 NuGet 安装它。
PM> Install-Package Aspose.Email
在开始工作之前，您需要在 Google Developer Console 上创建一个项目，这将允许您的应用程序与 Google 服务进行通信。要创建一个，您可以按照 本指南。
要访问和操作 Google 日历，我们需要编写一些代码来处理用户的信息并执行身份验证。对于 Google 用户，我们将首先创建一个名为 TestUser 的类，然后从 GoogleUser 类继承它。以下是这两个类的完整实现。
using System;
namespace Aspose.Email
{
internal enum GrantTypes
{
authorization_code,
refresh_token
}
public class TestUser
{
internal TestUser(string name, string eMail, string password, string domain)
{
Name = name;
EMail = eMail;
Password = password;
Domain = domain;
}
public readonly string Name;
public readonly string EMail;
public readonly string Password;
public readonly string Domain;
public static bool operator ==(TestUser x, TestUser y)
{
if ((object)x != null)
return x.Equals(y);
if ((object)y != null)
return y.Equals(x);
return true;
}
public static bool operator !=(TestUser x, TestUser y)
{
return !(x == y);
}
public static implicit operator string(TestUser user)
{
return user == null ? null : user.Name;
}
public override int GetHashCode()
{
return ToString().GetHashCode();
}
public override bool Equals(object obj)
{
return obj != null && obj is TestUser && this.ToString().Equals(obj.ToString(), StringComparison.OrdinalIgnoreCase);
}
public override string ToString()
{
return string.IsNullOrEmpty(Domain) ? Name : string.Format("{0}/{1}", Domain, Name);
}
}
public class GoogleUser : TestUser
{
public GoogleUser(string name, string eMail, string password)
: this(name, eMail, password, null, null, null)
{ }
public GoogleUser(string name, string eMail, string password, string clientId, string clientSecret)
: this(name, eMail, password, clientId, clientSecret, null)
{ }
public GoogleUser(string name, string eMail, string password, string clientId, string clientSecret, string refreshToken)
: base(name, eMail, password, "gmail.com")
{
ClientId = clientId;
ClientSecret = clientSecret;
RefreshToken = refreshToken;
}
public readonly string ClientId;
public readonly string ClientSecret;
public readonly string RefreshToken;
}
}
现在，我们需要创建一个帮助类来处理 Google 帐户的身份验证。我们将这个类命名为 GoogleOAuthHelper。下面是这个类的完整实现。
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace Aspose.Email
{
internal class GoogleOAuthHelper
{
public const string TOKEN_REQUEST_URL = "https://accounts.google.com/o/oauth2/token";
public const string SCOPE = "https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fcalendar" + "+" + "https%3A%2F%2Fwww.google.com%2Fm8%2Ffeeds%2F" + "+" + "https%3A%2F%2Fmail.google.com%2F"; // IMAP & SMTP
public const string REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob";
public const string REDIRECT_TYPE = "code";
internal static string GetAccessToken(TestUser user)
{
return GetAccessToken((GoogleUser)user);
}
internal static string GetAccessToken(GoogleUser user)
{
string access_token;
string token_type;
int expires_in;
GetAccessToken(user, out access_token, out token_type, out expires_in);
return access_token;
}
internal static void GetAccessToken(GoogleUser user, out string access_token, out string token_type, out int expires_in)
{
access_token = null;
token_type = null;
expires_in = 0;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(TOKEN_REQUEST_URL);
request.CookieContainer = new CookieContainer();
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
string encodedParameters = string.Format("client_id={0}&client_secret={1}&refresh_token={2}&grant_type={3}",
System.Web.HttpUtility.UrlEncode(user.ClientId), System.Web.HttpUtility.UrlEncode(user.ClientSecret), System.Web.HttpUtility.UrlEncode(user.RefreshToken), System.Web.HttpUtility.UrlEncode(GrantTypes.refresh_token.ToString()));
byte[] requestData = Encoding.UTF8.GetBytes(encodedParameters);
request.ContentLength = requestData.Length;
if (requestData.Length > 0)
using (Stream stream = request.GetRequestStream())
stream.Write(requestData, 0, requestData.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string responseText = null;
using (TextReader reader = new StreamReader(response.GetResponseStream(), Encoding.ASCII))
responseText = reader.ReadToEnd();
foreach (string sPair in responseText.Replace("{", "").Replace("}", "").Replace("\"", "").Split(new string[] { ",\n" }, StringSplitOptions.None))
{
string[] pair = sPair.Split(':');
string name = pair[0].Trim().ToLower();
string value = System.Web.HttpUtility.UrlDecode(pair[1].Trim());
switch (name)
{
case "access_token":
access_token = value;
break;
case "token_type":
token_type = value;
break;
case "expires_in":
expires_in = Convert.ToInt32(value);
break;
}
}
Debug.WriteLine("");
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine("-----------OAuth 2.0 authorization information-----------");
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine(string.Format("Login: '{0}'", user.EMail));
Debug.WriteLine(string.Format("Access token: '{0}'", access_token));
Debug.WriteLine(string.Format("Token type: '{0}'", token_type));
Debug.WriteLine(string.Format("Expires in: '{0}'", expires_in));
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine("");
}
internal static void GetAccessToken(TestUser user, out string access_token, out string refresh_token)
{
GetAccessToken((GoogleUser)user, out access_token, out refresh_token);
}
internal static void GetAccessToken(GoogleUser user, out string access_token, out string refresh_token)
{
string token_type;
int expires_in;
GoogleOAuthHelper.GetAccessToken(user, out access_token, out refresh_token, out token_type, out expires_in);
}
internal static void GetAccessToken(TestUser user, out string access_token, out string refresh_token, out string token_type, out int expires_in)
{
GetAccessToken((GoogleUser)user, out access_token, out refresh_token, out token_type, out expires_in);
}
internal static void GetAccessToken(GoogleUser user, out string access_token, out string refresh_token, out string token_type, out int expires_in)
{
string authorizationCode = GoogleOAuthHelper.GetAuthorizationCode(user, GoogleOAuthHelper.SCOPE, GoogleOAuthHelper.REDIRECT_URI, GoogleOAuthHelper.REDIRECT_TYPE);
GoogleOAuthHelper.GetAccessToken(authorizationCode, user, out access_token, out token_type, out expires_in, out refresh_token);
}
internal static void GetAccessToken(string authorizationCode, TestUser user, out string access_token, out string token_type, out int expires_in, out string refresh_token)
{
GetAccessToken(authorizationCode, (GoogleUser)user, out access_token, out token_type, out expires_in, out refresh_token);
}
internal static void GetAccessToken(string authorizationCode, GoogleUser user, out string access_token, out string token_type, out int expires_in, out string refresh_token)
{
access_token = null;
token_type = null;
expires_in = 0;
refresh_token = null;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(TOKEN_REQUEST_URL);
request.CookieContainer = new CookieContainer();
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
string encodedParameters = string.Format("client_id={0}&code={1}&client_secret={2}&redirect_uri={3}&grant_type={4}", System.Web.HttpUtility.UrlEncode(user.ClientId), System.Web.HttpUtility.UrlEncode(authorizationCode), System.Web.HttpUtility.UrlEncode(user.ClientSecret), System.Web.HttpUtility.UrlEncode(REDIRECT_URI), System.Web.HttpUtility.UrlEncode(GrantTypes.authorization_code.ToString()));
byte[] requestData = Encoding.UTF8.GetBytes(encodedParameters);
request.ContentLength = requestData.Length;
if (requestData.Length > 0)
using (Stream stream = request.GetRequestStream())
stream.Write(requestData, 0, requestData.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string responseText = null;
using (TextReader reader = new StreamReader(response.GetResponseStream(), Encoding.ASCII))
responseText = reader.ReadToEnd();
foreach (string sPair in responseText.Replace("{", "").Replace("}", "").Replace("\"", "").Split(new string[] { ",\n" }, StringSplitOptions.None))
{
string[] pair = sPair.Split(':');
string name = pair[0].Trim().ToLower();
string value = System.Web.HttpUtility.UrlDecode(pair[1].Trim());
switch (name)
{
case "access_token":
access_token = value;
break;
case "token_type":
token_type = value;
break;
case "expires_in":
expires_in = Convert.ToInt32(value);
break;
case "refresh_token":
refresh_token = value;
break;
}
}
Debug.WriteLine(string.Format("Authorization code: '{0}'", authorizationCode));
Debug.WriteLine(string.Format("Access token: '{0}'", access_token));
Debug.WriteLine(string.Format("Refresh token: '{0}'", refresh_token));
Debug.WriteLine(string.Format("Token type: '{0}'", token_type));
Debug.WriteLine(string.Format("Expires in: '{0}'", expires_in));
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine("");
}
internal static string GetAuthorizationCode(TestUser acc, string scope, string redirectUri, string responseType)
{
return GetAuthorizationCode((GoogleUser)acc, scope, redirectUri, responseType);
}
internal static string GetAuthorizationCode(GoogleUser acc, string scope, string redirectUri, string responseType)
{
Debug.WriteLine("");
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine("-----------OAuth 2.0 authorization information-----------");
Debug.WriteLine("---------------------------------------------------------");
Debug.WriteLine(string.Format("Login: '{0}'", acc.EMail));
string authorizationCode = null;
string error = null;
string approveUrl = string.Format("https://accounts.google.com/o/oauth2/auth?redirect_uri={0}&response_type={1}&client_id={2}&scope={3}", redirectUri, responseType, acc.ClientId, scope);
AutoResetEvent are0 = new AutoResetEvent(false);
Thread t = new Thread(delegate ()
{
bool doEvents = true;
WebBrowser browser = new WebBrowser();
browser.AllowNavigation = true;
browser.DocumentCompleted += delegate (object sender, WebBrowserDocumentCompletedEventArgs e) { doEvents = false; };
Form f = new Form();
f.FormBorderStyle = FormBorderStyle.FixedToolWindow;
f.ShowInTaskbar = false;
f.StartPosition = FormStartPosition.Manual;
f.Location = new System.Drawing.Point(-2000, -2000);
f.Size = new System.Drawing.Size(1, 1);
f.Controls.Add(browser);
f.Load += delegate (object sender, EventArgs e)
{
try
{
browser.Navigate("https://accounts.google.com/Logout");
doEvents = true;
while (doEvents) Application.DoEvents();
browser.Navigate("https://accounts.google.com/ServiceLogin?sacu=1");
doEvents = true;
while (doEvents) Application.DoEvents();
HtmlElement loginForm = browser.Document.Forms["gaia_loginform"];
if (loginForm != null)
{
HtmlElement userName = browser.Document.All["Email"];
userName.SetAttribute("value", acc.EMail);
loginForm.InvokeMember("submit");
doEvents = true;
while (doEvents)
Application.DoEvents();
loginForm = browser.Document.Forms["gaia_loginform"];
HtmlElement passwd = browser.Document.All["Passwd"];
passwd.SetAttribute("value", acc.Password);
loginForm.InvokeMember("submit");
doEvents = true;
while (doEvents)
Application.DoEvents();
}
else
{
error = "Login form is not found in \n" + browser.Document.Body.InnerHtml;
return;
}
browser.Navigate(approveUrl);
doEvents = true;
while (doEvents) Application.DoEvents();
HtmlElement approveForm = browser.Document.Forms["connect-approve"];
if (approveForm != null)
{
HtmlElement submitAccess = browser.Document.All["submit_access"];
submitAccess.SetAttribute("value", "true");
approveForm.InvokeMember("submit");
doEvents = true;
while (doEvents)
Application.DoEvents();
}
else
{
error = "Approve form is not found in \n" + browser.Document.Body.InnerHtml;
return;
}
HtmlElement code = browser.Document.All["code"];
if (code != null)
authorizationCode = code.GetAttribute("value");
else
error = "Authorization code is not found in \n" + browser.Document.Body.InnerHtml;
}
catch (Exception ex)
{
error = ex.Message;
}
finally
{
f.Close();
}
};
Application.Run(f);
are0.Set();
});
t.SetApartmentState(ApartmentState.STA);
t.Start();
are0.WaitOne();
if (error != null)
throw new Exception(error);
return authorizationCode;
}
}
}
在 C# 中创建 Google 日历
完成上述配置后，您可以继续使用 Google 日历服务。以下是在 C# 中创建和更新 Google 日历的步骤。
- 使用 GmailClient.GetInstance(String, String) 方法将 GmailClient 类的实例放入 IGmailClient 对象。
- 创建 Calendar 类的实例并使用名称、描述和其他属性对其进行初始化。
- 调用 IGmailClient.CreateCalendar(Calendar) 方法来创建谷歌日历。
- 获取返回的日历ID。
以下代码示例展示了如何在 C# 中创建 Google 日历。
// 初始化谷歌用户
GoogleUser User = new GoogleUser("user", "email address", "password", "clientId", "client secret");
string accessToken;
string refreshToken;
// 获取访问令牌
GoogleOAuthHelper.GetAccessToken(User, out accessToken, out refreshToken);
// 获取 Gmail 客户端实例
using (IGmailClient client = GmailClient.GetInstance(accessToken, User.EMail))
{
// 插入并获取日历
Aspose.Email.Clients.Google.Calendar calendar = new Aspose.Email.Clients.Google.Calendar("summary - " + Guid.NewGuid().ToString(), null, null, "America/Los_Angeles");
// 插入日历并检索 id
string id = client.CreateCalendar(calendar);
Aspose.Email.Clients.Google.Calendar cal = client.FetchCalendar(id);
}
C# 更新谷歌日历
以下是在 C# 中以编程方式更新 Google 日历的步骤。
- 使用 GmailClient.GetInstance(String, String) 方法将 GmailClient 类的实例放入 IGmailClient 对象。
- 使用 IGmailClient.FetchCalendar(String) 方法使用其 ID 获取日历实例。
- 更新日历的属性并调用 IGmailClient.UpdateCalendar(Calendar) 方法来更新日历。
以下代码示例展示了如何在 C# 中更新 Google 日历。
// 获取 Gmail 客户端实例
using (IGmailClient client = GmailClient.GetInstance(accessToken, User.EMail))
{
string id = "<<calendar ID>>";
// 获取日历
Aspose.Email.Clients.Google.Calendar cal = client.FetchCalendar(id);
// 更改获取的日历中的信息并更新日历
cal.Description = "Description - " + Guid.NewGuid().ToString();
cal.Location = "Location - " + Guid.NewGuid().ToString();
// 更新日历
client.UpdateCalendar(cal);
}
C# 删除谷歌日历
您还可以使用 Aspose.Email for .NET 删除特定日历。以下是执行此操作的步骤。
- 使用 GmailClient.GetInstance(String, String) 方法将 GmailClient 类的实例放入 IGmailClient 对象。
- 使用 IGmailClient.ListCalendars() 方法获取日历列表。
- 遍历列表并过滤所需的列表。
- 使用 IGmailClient.DeleteCalendar(Calendar.Id) 方法删除日历。
以下代码示例展示了如何在 C# 中删除 Google 日历。
// 获取 Gmail 客户端实例
using (IGmailClient client = GmailClient.GetInstance(accessToken, User.EMail))
{
// 从“日历摘要 - ”开始访问和删除带有摘要的日历
string summary = "Calendar summary - ";
// 获取日历列表
ExtendedCalendar[] lst0 = client.ListCalendars();
foreach (ExtendedCalendar extCal in lst0)
{
// 删除选定的日历
if (extCal.Summary.StartsWith(summary))
client.DeleteCalendar(extCal.Id);
}
}
用于 Google 日历的 C# API - 获取免费许可证
您可以获得 免费临时许可证 以使用 Aspose.Email for .NET，而不受评估限制。
结论
在本文中，您学习了如何使用 C# 以编程方式创建 Google 日历。此外，您还了解了如何在 C# 中更新和删除特定的 Google 日历。此外，您可以浏览 文档 以了解更多关于 Aspose.Email for .NET 的信息。此外，您可以通过我们的 论坛 提问。