WF4 RC的“类型未定义”异常
我在调用我的工作流时（动态地）开始了以下异常：
处理工作流树时遇到以下错误：'DynamicActivity'：活动'1：DynamicActivity'的私有实现具有以下验证错误：编译器错误遇到处理表达式“TryCast（simplerule_out，OutputBase2）”。 类型'OutputBase2'未定义。
'DynamicActivity'：活动'1：DynamicActivity'的私有实现具有以下验证错误：编译器错误遇到处理表达式“Res”。 类型'OutputBase2'未定义。
'DynamicActivity'：活动'1：DynamicActivity'的私有实现具有以下验证错误：编译器错误遇到处理表达式“Res”。 类型'OutputBase2'未定义。
'DynamicActivity'：活动'1：DynamicActivity'的私有实现具有以下验证错误：编译器错误遇到处理表达式“New List（Of OutputBase2）”。 类型'OutputBase2'未定义。
工作流程非常简单，在VS 2010 beta 2上运行良好！
我所要做的就是创建我的抽象自定义类型“OutputBase2”的新列表。
public class OutputBase2
{
public OutputBase2() { }
public bool Succeeded { get; set; }
}
class Example
{
public void Exec()
{
ActivityBuilder builder = new ActivityBuilder();
builder.Name = "act1";
var res = new DynamicActivityProperty { Name = "Res", Type = typeof(OutArgument<List<OutputBase2>>), Value = new OutArgument<List<OutputBase2>>() };
builder.Properties.Add(res);
builder.Implementation = new Sequence();
((Sequence)builder.Implementation).Activities.Add(new Assign<List<OutputBase2>> { To = new VisualBasicReference<List<OutputBase2>> { ExpressionText = res.Name }, Value = new VisualBasicValue<List<OutputBase2>>("New List(Of OutputBase2)") });
Activity act = getActivity(builder);
var res2 = WorkflowInvoker.Invoke(act);
}
string getXamlStringFromActivityBuilder(ActivityBuilder activityBuilder)
{
string xamlString;
StringBuilder stringBuilder = new StringBuilder();
System.IO.StringWriter stringWriter = new System.IO.StringWriter(stringBuilder);
System.Xaml.XamlSchemaContext xamlSchemaContext = new System.Xaml.XamlSchemaContext();
System.Xaml.XamlXmlWriter xamlXmlWriter = new System.Xaml.XamlXmlWriter(stringWriter, xamlSchemaContext);
System.Xaml.XamlWriter xamlWriter = System.Activities.XamlIntegration.ActivityXamlServices.CreateBuilderWriter(xamlXmlWriter);
System.Xaml.XamlServices.Save(xamlWriter, activityBuilder);
xamlString = stringBuilder.ToString();
return xamlString;
}
public Activity getActivity(ActivityBuilder t)
{
string xamlString = getXamlStringFromActivityBuilder(t);
System.IO.StringReader stringReader = new System.IO.StringReader(xamlString);
Activity activity = System.Activities.XamlIntegration.ActivityXamlServices.Load(stringReader);
return activity;
}
}
谢谢！
解决方案是在执行活动时添加'VisualBasicSettings'实例。
这个线程很有用：
http://social.msdn.microsoft.com/Forums/en-US/wfprerelease/thread/2b77771e-84a6-4ec3-a944-3de2a60201fc