我想使用c＃和gmail api读取我的Gmail帐户中的所有邮件。 我可以这样做吗？ 我在Gmail API上阅读了很多文章，但我无法阅读消息。 另外，我想阅读一些消息或标题。 如果有人可以帮助我，我会很高兴:)
我使用这段代码：
public static List<Message> ListMessages(GmailService service, String userId)
{
List<Message> result = new List<Message>();
UsersResource.MessagesResource.ListRequest request = service.Users.Messages.List(userId);
do
{
try
{
ListMessagesResponse response = request.Execute();
result.AddRange(response.Messages);
request.PageToken = response.NextPageToken;
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
} while (!String.IsNullOrEmpty(request.PageToken));
return result;
}
还有这个：
foreach (var item in ListMessages(service,"me"))
MessageBox.Show(item.Snippet);
但结果我有空消息框。
是的，你说你做的话应该没问题。我建议多阅读一下文档。
首先，您需要进行身份验证 - 以下显示如何使用服务帐户执行此操作（此处更多详细信息https://developers.google.com/gmail/api/auth/web-server）
serviceAccountEmail = primaryLink.serviceEmailAddress;
certificate = new X509Certificate2(AppDomain.CurrentDomain.BaseDirectory + "certs//" + primaryLink.certificate, primaryLink.certificatePassword, X509KeyStorageFlags.Exportable);
try
{
credential = new ServiceAccountCredential(
new ServiceAccountCredential.Initializer(serviceAccountEmail)
{
User = z.us.emailAccount,
Scopes = new[] { "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile", "https://mail.google.com/" }
}.FromCertificate(certificate));
if (credential.RequestAccessTokenAsync(CancellationToken.None).Result)
{
gs = new GmailService(
new Google.Apis.Services.BaseClientService.Initializer()
{
ApplicationName = "Example",
HttpClientInitializer = credential
});
}
else
{
throw new Exception("gmail authentication Error.");
}
}
catch (Exception ex)
{
throw ex;
}
ListMessagesResponse respM = reqM.Execute();
if (respM.Messages != null)
{
foreach (Message m in respM.Messages)
{}
}
获得消息列表后，您可以遍历消息并使用MIME解析器或遍历消息结构以获取标题，正文等。
这个论坛有很多帖子都会介绍如何做到这一点。
我搜索了一个完整的例子，没有运气，但这是我的工作示例。基于https://developers.google.com/gmail/api/guides
这是获取第一封电子邮件地址的代码段，但您可以简单地遍历所有的findIds以获取所有电子邮件，并使用message.snippet获取正文：
List<string> foundIds = new List<string>();
string outputDir = "/EXAMPLE/EXAMPLE/"; // your preferred Dir to save attachments to
List<Google.Apis.Gmail.v1.Data.Thread> resultThread = new List<Google.Apis.Gmail.v1.Data.Thread>();
UsersResource.ThreadsResource.ListRequest requestThread = service.Users.Threads.List("me");
do
{
try
{
ListThreadsResponse responseThread = requestThread.Execute();
resultThread.AddRange(responseThread.Threads);
foreach (var item in responseThread.Threads )
{
foundIds.Add(item.Id);
}
requestThread.PageToken = responseThread.NextPageToken;
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
} while (!String.IsNullOrEmpty(requestThread.PageToken));
try
{
Message message = service.Users.Messages.Get("me", foundIds[0]).Execute();
IList<MessagePart> parts = message.Payload.Parts;
foreach (MessagePart part in parts)
{
if (!String.IsNullOrEmpty(part.Filename))
{
String attId = part.Body.AttachmentId;
MessagePartBody attachPart = service.Users.Messages.Attachments.Get("me", foundIds[0], attId).Execute();
// Converting from RFC 4648 base64 to base64url encoding
// see http://en.wikipedia.org/wiki/Base64#Implementations_and_history
String attachData = attachPart.Data.Replace('-', '+');
attachData = attachData.Replace('_', '/');
byte[] data = Convert.FromBase64String(attachData);
File.WriteAllBytes(Path.Combine(outputDir, part.Filename), data);
}
}
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
@BlackCat，你的ListMessages看起来不错。现在，要获取消息体，您必须解码MimeType“text / plain”或“text / html”。例如：
public static void GetBody(GmailService service, String userId, String messageId, String outputDir)
{
try
{
Message message = service.Users.Messages.Get(userId, messageId).Execute();
Console.WriteLine(message.InternalDate);
if (message.Payload.MimeType == "text/plain")
{
byte[] data = FromBase64ForUrlString(message.Payload.Body.Data);
string decodedString = Encoding.UTF8.GetString(data);
Console.WriteLine(decodedString);
}
else
{
IList<MessagePart> parts = message.Payload.Parts;
if (parts != null && parts.Count > 0)
{
foreach (MessagePart part in parts)
{
if (part.MimeType == "text/html")
{
byte[] data = FromBase64ForUrlString(part.Body.Data);
string decodedString = Encoding.UTF8.GetString(data);
Console.WriteLine(decodedString);
}
}
}
}
Console.WriteLine("----");
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
}