Google使用ApiV3创建Cotact出错

Question

我正在使用google api 3.0版，我可以使用c＃成功登录gmail。并且在我能够成功检索联系人之后也获得访问代码。之后，我想添加新的联系人，但我无法使用以下代码创建新的联系人。 public static联系CreateContacts（ContactsRequest cr）         {             联系newEntry = new联系方式（）;

        // Set the contact's name.
        newEntry.Name = new Name()
        {
            FullName = "Harsh Desai",
            GivenName = "Harsh",
            FamilyName = "Desai",
        };
        newEntry.Content = "Notes";
        // Set the contact's e-mail addresses.
        newEntry.Emails.Add(new EMail()
        {
            Primary = true,
            Rel = ContactsRelationships.IsHome,
            Address = "h@gmail.com"
        });
        newEntry.Emails.Add(new EMail()
        {
            Rel = ContactsRelationships.IsWork,
            Address = "ha@example.com"
        });
        // Set the contact's phone numbers.
        newEntry.Phonenumbers.Add(new PhoneNumber()
        {
            Primary = true,
            Rel = ContactsRelationships.IsWork,
            Value = "9825277788",
        });
        newEntry.Phonenumbers.Add(new PhoneNumber()
        {
            Rel = ContactsRelationships.IsHome,
            Value = "0123654789",
        });
        // Set the contact's IM information.
        newEntry.PostalAddresses.Add(new StructuredPostalAddress()
        {
            Rel = ContactsRelationships.IsWork,
            Primary = true,
            Street = "1/Radhakrishna",
            City = "Surat",
            Postcode = "395007",
            Country = "India",
        });

        // Insert the contact.
        Uri feedUri = new Uri(ContactsQuery.CreateContactsUri("default"));

        Contact createdEntry = cr.Insert(feedUri, newEntry);
        Console.WriteLine("Contact's ID: " + createdEntry.Id);
        return createdEntry;
    }

我在这一行收到错误联系createdEntry = cr.Insert（feedUri，newEntry）。 错误是远程服务器返回错误：（400）错误请求。