非静态字段、方法或属性“Functions.telemetry”PocSendGrid需要对象引用。

Question

我有以下错误：

An object reference is required for the non-static field, method, or property 'Functions.telemetry' 

在以下代码中：

 private TelemetryClient telemetry = new TelemetryClient();
        // This function will get triggered/executed when a new message is written 
        // on an Azure Queue called sendgridqueue.
        public static async Task ProcessQueueMessageAsync([QueueTrigger("sendgridqueue")] string message, TextWriter log)
        {
            Message msg = JsonConvert.DeserializeObject<Message>(message);
            await Execute(msg, log);           
        }


        static async Task Execute(Message message, TextWriter log)
        {
            telemetry.TrackEvent("WinGame");


            log.WriteLine(String.Format("{0}: Message is being sent with subject {1}, to {2}, and body{3}", DateTime.Now, message.Subject, message.To.ToString(), message.HtmlBody));
            var client = new SendGridClient(ConfigurationManager.AppSettings["Sendgridapikey"]);
            var from = new EmailAddress(message.From);
            var subject = message.Subject;
            var to = new EmailAddress(message.To.ToString());
            var plainTextContent = message.PlainTextBody;
            var htmlContent = message.HtmlBody;
            var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);
            log.WriteLine(String.Format("{0}: Message was sent with subject {1}, to {2}, and body{3}", DateTime.Now, message.Subject, message.To.ToString(), message.HtmlBody));

            log.WriteLine(String.Format("Message took: {0} between queueing and sending", (DateTime.Now - message.DateandTimeSent).TotalMilliseconds));

        }

但是，如果删除静态关键字，则会得到另一个错误，我不希望每次都实例化TelemetryClient。

Answer 1

telemetry是一个实例变量--每次实例化该类时都会创建一个新变量。

您的方法是静态的-它们不能访问实例变量。

一个简单的解决方案就是在您的TelemetryClient方法中实例化Execute：

static async Task Execute(Message message, TextWriter log)
{
    TelemetryClient telemetry = new TelemetryClient();
    telemetry.TrackEvent("WinGame");
    ...