TFS服务器端插件启动了两次

Question

我为TFS 2015实现了一个简单的WorkItemChangedEventHandler。

在我的TFS 2015 Express测试安装中，事件处理程序实例化两次。第一个实例是在TFS识别出 BinDirChangeOrDirectoryRename 作为新构建的结果之后立即创建的。第二次实例是在第一次访问数据库后立即创建的。

鉴于此源代码（注意，只有构造函数是相关的）：

using System;
using System.Diagnostics;
using Microsoft.TeamFoundation.Common;
using Microsoft.TeamFoundation.Framework.Server;
using Microsoft.TeamFoundation.WorkItemTracking.Server;

namespace MyFirstTfsPlugin
{
    public class TfsTriggerConfluenceUpdateOnWorkItemChanged : ISubscriber
    {
        public TfsTriggerConfluenceUpdateOnWorkItemChanged()
        {
            EventLog.WriteEntry("TFS Services", $"New Plugin Instance Created with Hash {GetHashCode()}");
        }

        public string Name => "WorkItemChangedEventHandler";

        public SubscriberPriority Priority => SubscriberPriority.Normal;

        public Type[] SubscribedTypes() => new[] { typeof(WorkItemChangedEvent) };

        public EventNotificationStatus ProcessEvent(
            IVssRequestContext requestContext,
            NotificationType notificationType,
            object notificationEventArgs,
            out int statusCode,
            out string statusMessage,
            out ExceptionPropertyCollection properties)
        {
            statusCode = 0;
            properties = null;
            statusMessage = String.Empty;
            return EventNotificationStatus.ActionPermitted;
        }
    }
}

我记录了以下事件：

Information 09.03.2017 17:37:16 TFS Services        9002    None    The application is being shutdown for the following reason: BinDirChangeOrDirectoryRename
Information 09.03.2017 17:37:23 TFS Services        0       None    New Plugin Instance Created with Hash 44661510
Information 09.03.2017 17:37:24 TFS Services        9001    None    Application Request Processing Started
Information 09.03.2017 17:37:58 MSSQL$SQLEXPRESS    17137   Server  Starting up database 'Tfs_DefaultCollection'.
Information 09.03.2017 17:37:58 TFS Services        0       None    New Plugin Instance Created with Hash 27996961

这是TFS 2015中的错误还是我错过了什么？

Answer 1

我已经测试了你的代码，并发现事件日志写了＆＃34;使用Hash xxxxxx创建的新插件实例＆＃34;不时，不只是两次（对不起，我无法找出为什么会发生这种情况）。

但是如果在ProcessEvent中添加EventLog.WriteEntry，则行为是正确的。更改工作项时，事件日志中只有一个条目：

using System;
using System.Diagnostics;
using Microsoft.TeamFoundation.Common;
using Microsoft.TeamFoundation.Framework.Server;
using Microsoft.TeamFoundation.WorkItemTracking.Server;

namespace MyFirstTfsPlugin
{
    public class TfsTriggerConfluenceUpdateOnWorkItemChanged : ISubscriber
    {
               //public TfsTriggerConfluenceUpdateOnWorkItemChanged()
    //{
    //    EventLog.WriteEntry("TFS Services 1", $"New Plugin Instance Created with Hash {GetHashCode()}");
    //}

        public string Name => "WorkItemChangedEventHandler";

        public SubscriberPriority Priority => SubscriberPriority.Normal;

        public Type[] SubscribedTypes() => new[] { typeof(WorkItemChangedEvent) };

        public EventNotificationStatus ProcessEvent(
            IVssRequestContext requestContext,
            NotificationType notificationType,
            object notificationEventArgs,
            out int statusCode,
            out string statusMessage,
            out ExceptionPropertyCollection properties)
        {
            EventLog.WriteEntry("TFS Services 2", $"workitem Created with Hash {GetHashCode()}");
            statusCode = 0;
            properties = null;
            statusMessage = String.Empty;
            return EventNotificationStatus.ActionPermitted;
        }
    }
}