首先是免责声明 - 我是WF的新手，我只使用WF4玩了3天 - 所以对我可能有的任何良性或蹩脚的问题道歉......
我正在尝试在我的项目中实现WF4状态机。以下是一些背景信息：
代码：
public void Initialize(WinSipNetLib.WinSipItf winSipItf, string hostname, string user, string password)
{
try
{
WinSipItf = winSipItf;
var Itf = WinSipItf;
var input = new Dictionary<string, object>
{
{"winSipItf", Itf}
};
this.WorkFlowHostApp = new WorkflowApplication(new Activity1(), input)
{
Idle = this.OnWorkflowIdle,
Completed = this.OnWorkflowCompleted
};
// Setup the Tracking to output in the debug window
WorkFlowHostApp.Extensions.Add(new Tracker());
this.WorkFlowHostApp.Extensions.Add(this);
this.workflowBusy.Reset();
Console.WriteLine("Starting Workflow");
this.WorkFlowHostApp.Run();
}
catch (Exception ex)
{
Console.Write(ex);
}
}
手机初始状态为Initial，它具有目标状态PhoneIdle的自动/空触发器。 OnEntrace到Initial状态我需要用网络堆栈执行几个Phone注册 - 注册一个回调（同步操作）并注册网络堆栈管理器（async）。所有这些功能都存在于我通过接口层中构建的API访问的较低级别的非托管代码中。注册成功后，我在接口层获得回调并触发事件。因此，我的注册活动看起来像这样：
public sealed class Register : NativeActivity<Int32>
{
// Define an activity input argument of type string
[RequiredArgument]
public InArgument<WinSipNetLib.WinSipItf> winSipItf { get; set; }
#region Constants and Fields
private readonly Variable<NoPersistHandle> _noPersistHandle = new Variable<NoPersistHandle>();
internal const string BookmarkName = "WaitingForAccountStatusEvent";
/// <summary>
/// The transition callback.
/// </summary>
private BookmarkCallback registrationCallback;
#endregion
#region Properties
///// <summary>
///// Gets or sets PhoneTransition.
///// </summary>
//public PhoneTransition PhoneTransition { get; set; }
/// <summary>
/// Gets a value indicating whether CanInduceIdle.
/// </summary>
protected override bool CanInduceIdle
{
get
{
return true;
}
}
/// <summary>
/// Gets TransitionCallback.
/// </summary>
private BookmarkCallback RegistrationCallback
{
get
{
return this.registrationCallback ?? (this.registrationCallback = new BookmarkCallback(this.OnRegistrationCallback));
}
}
#endregion
#region Methods
/// <summary>
/// The cache metadata.
/// </summary>
/// <param name="metadata">
/// The metadata.
/// </param>
protected override void CacheMetadata(NativeActivityMetadata metadata)
{
metadata.RequireExtension(typeof(Tracker));
metadata.RequireExtension(typeof(Phone));
metadata.RequireExtension(typeof(WaitForRegistrationExt));
// !!! and one more for GUI
// Provide a Func<T> to create the extension if it does not already exist
metadata.AddDefaultExtensionProvider(() => new WaitForRegistrationExt());
metadata.AddArgument(new RuntimeArgument("winSipItf", typeof(WinSipNetLib.WinSipItf), ArgumentDirection.In, true));
metadata.AddArgument(new RuntimeArgument("Result", typeof(int), ArgumentDirection.Out, false));
metadata.AddImplementationVariable(_noPersistHandle);
}
protected override void Execute(NativeActivityContext context)
{
// Enter a no persist zone to pin this activity to memory since we are setting up a delegate to receive a callback
var handle = _noPersistHandle.Get(context);
handle.Enter(context);
// Get Phone extension needed to call the functions in WinSipItf
Phone phone = (Phone)context.GetExtension<Phone>();
// Get (which may create) the extension
WaitForRegistrationExt regExt = context.GetExtension<WaitForRegistrationExt>();
// Add the callback
regExt.AddRegistrationCallback(winSipItf.Get(context));
bool bRet = phone.WinSipItf.RegisterDBusCallback("WinSipPhone");
// Obtain the runtime value of the Text input argument
if (bRet == false)
{
this.Result.Set(context, bRet.ToString());
return;
}
string hostname = "demo2.demo.com";
string username = "406";
string password = "123123";
string id = username + "@" + hostname;
String regUri = hostname;
if (phone.WinSipItf.DoSipRegister(id, regUri, username, password) == 0)
{
this.Result.Set(context, bRet.ToString());
return;
}
// Set a bookmark - the extension will resume when the Gizmo is fired
context.CreateBookmark(BookmarkName, RegistrationCallback);
//context.CreateBookmark(this.PhoneTransition.ToString(), this.RegistrationCallback);
//// Obtain the runtime value of the Text input argument
//string text = context.GetValue(this.Text);
//Result.Set(context, string.Format("The text is {0}", text));
}
/// <summary>
/// The on transition callback.
/// </summary>
/// <param name="context">
/// The context.
/// </param>
/// <param name="bookmark">
/// The bookmark.
/// </param>
/// <param name="value">
/// The value.
/// </param>
/// <exception cref="InvalidOperationException">
/// </exception>
private void OnRegistrationCallback(NativeActivityContext context, Bookmark bookmark, object value)
{
if (value is WinSipItf.MSGDATA)
{
}
////if (value is StateTransitionResult)
//{
// this.Result.Set(context, value as StateTransitionResult);
//}
//else if (value != null)
//{
// // Resumed with something else
// throw new InvalidOperationException(
// "You must resume PhoneTransition bookmarks with a result of type StateTransitionResult");
//}
// Exit the no persist zone
var handle = _noPersistHandle.Get(context);
handle.Exit(context);
}
#endregion
}
正如您从代码中看到的那样，我制作了像phone.WinSipItf.DoSipRegister这样的cals
有效吗？我认为所有状态机都在与WinSipItf对象构造的线程不同的线程上执行...
多余的说我不知道这个...我甚至无法在Execute或CacheMetadata中破解。不知道此时该怎么做。
值得一提的是我的xaml图是完全构建的，但是我试图通过构造这个自定义活动来实现Initial状态并将其转换为Idle状态......
也许我已经开始从一个简单的问题开始了：我得到“必须活动参数的值'winSipItf'未被提供”警告当我将我的Register活动放在初始状态条目上时。我检查了所有代码，我不明白为什么。我错过了什么？
答案 0 :(得分：3)
首先，由于您不熟悉Workflow，因此您可能需要执行Introduction to State Machine Hands On Lab。
第二 - 我有一个示例应用程序，演示如何支持回调（是的，工作流正在另一个线程上执行）Windows Workflow Foundation (WF4) - Activity Callbacks and Event Handlers。
答案 1 :(得分：0)
您没有添加工作流定义，但错误“未提供所需活动参数的值'winSipItf'”似乎是未设置Register活动的winSipItf参数的结果。它被标记为必需，因此需要使用工作流中的VB表达式进行设置。您正在向工作流提供名称为winSipItf的参数，但该参数与worklfow参数相关联，并且不会传播到包含具有相同参数名称的活动。