尝试循环通过Azure表中的实体时出错

我一直收到这个错误，"当前值‘String.Empty’类型与预期的‘System.Boolean’类型不兼容"，当我尝试从Azure表中循环遍历一组实体时，我只是使用Azure的新手，所以这可能是一个非常容易的错误，我正在收到这个错误。

我的代码：

private void registerButton_Click(object sender, RoutedEventArgs e)
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("StorageConnectionString"));
        // Create the table client
        CloudTableClient tableClient = storageAccount.CreateCloudTableClient();
        // Get the data service context
        TableServiceContext serviceContext = tableClient.GetDataServiceContext();
        // Create a new customer entity
        user = new UserDetailsEntity();
        //Setting the fields of the new userEntity
        user.username = usernameText.Text;
        user.password = passwordText.Text;
        user.subscriptionID = subText.Text;
        user.subscriptionName = subscriptionNameText.Text;
        user.thumbprint = thumbprintText.Text;
        user.email = emailText.Text;
        user.phoneNumber = "3530" + numberText.Text;

        int rowCount = 1;

        CloudTableQuery<UserDetailsEntity> Query = (from en in serviceContext.CreateQuery<UserDetailsEntity>("userdetails")
                                                             select   en).AsTableServiceQuery<UserDetailsEntity>();
        //error occurs in the next line
        foreach (UserDetailsEntity ent in Query)
        {
            rowCount++;
        }
        user.RowKey = rowCount.ToString();


            // Add the new customer to the people table
            serviceContext.AddObject("userdetails", user);
            // Submit the operation to the table service
            serviceContext.SaveChangesWithRetries();
            //Set the variables so they can be retrieved when the next screen loads
            Application.Current.Properties["username"] = usernameText.Text;
            Application.Current.Properties["password"] = passwordText.Text;
            Window1 userHome = new Window1();
            this.Close(); //to close Password window 
            userHome.Show(); //to show Main form 
        }