C# 连接到exchangeServices以获取我的日历并获取错误

我尝试使用exchange服务器上的outlook帐户通过asp.net连接到C#exchange ews，并且在尝试获取日历时，我不断收到“当以没有邮箱的帐户发出请求时，您必须为任何可分辨文件夹ID指定邮箱主SMTP地址。”

连接到ews：

private ExchangeService ConnectToService(ExchangeRetrivalParams exchangeRetrivalParams)
{
    ExchangeService service = new ExchangeService(exchangeRetrivalParams.ExchangeVer);
    service.Credentials = new WebCredentials(exchangeRetrivalParams.Username, exchangeRetrivalParams.Password);
    service.UseDefaultCredentials = true;
    service.AutodiscoverUrl(exchangeRetrivalParams.Email, RedirectionUrlValidationCallback);
    return service;
}

正在尝试获取日历：

try {
    ExchangeService service = ConnectToService(email, username, password);

    int NUM_APPTS = NumberOfItems;

    // Initialize the calendar folder object with only the folder ID.
    CalendarFolder calendar = CalendarFolder.Bind(service, WellKnownFolderName.Calendar, new PropertySet());
    //get the start and end times
    DateTime startDate = new DateTime(2017, 7, 21);
    DateTime endDate = new DateTime(2017, 7, 23);

    // Set the start and end time and number of appointments to retrieve.
    CalendarView cView = new CalendarView(startDate, endDate, NUM_APPTS);
    // Limit the properties returned to the appointment's subject, start time, and end time.
    cView.PropertySet = new PropertySet(AppointmentSchema.Start,
                                        AppointmentSchema.End,
                                        AppointmentSchema.IsRecurring,
                                        AppointmentSchema.AppointmentType);
}
catch (Exception e) {
    lastOperationErrorMsg = e.Message;
    return null;
}

它失败于：

当以没有邮箱的帐户进行请求时，必须为任何可分辨文件夹ID指定邮箱主SMTP地址

关于：

CalendarFolder calendar=CalendarFolder.Bind（服务，WellKnownFolderName.calendar，新属性集（））

任何帮助都将不胜感激。
您可以同时使用webcredentials和UseDefaultCredentials，例如

 service.Credentials = new WebCredentials(exchangeRetrivalParams.Username, exchangeRetrivalParams.Password);
service.UseDefaultCredentials = true;

您应该使用一个或另一个，如果您试图模拟当前登录的用户，那么您必须处理Kerbros委派，例如，我建议您遵循
中的示例确定，因此我发现它与：

ExchangeService service = new ExchangeService("ExchangeVersion");
service.Credentials = new WebCredentials("Username", "Password", "Domain");
service.AutodiscoverUrl("Email", RedirectionUrlValidationCallback);

现在它连接并检索所有请求的约会（根据开始和结束日期）

希望这是一种良好的做法，如果我删除其中一项，它可以接受新的建议
：service.Credentials=newWebCredentials（ExchangeTrivalParams.Username，ExchangeTrivalParams.Password）；service.UseDefaultCredentials=true；然后我得到一个错误：“找不到自动发现服务。”