我有一个自定义活动列表(用C#编写),其中每个都来自NativeActivity,现在我在foreach循环的帮助下将所有这些活动添加到序列中。 现在的问题是,如果我需要从活动中获取某些价值并将其传递给另一项活动,我应该如何继续。
假设,activity1将一个字符串属性值设置为“某个文件名”(允许一个图像文件路径),并根据它在它旁边的活动,借助于for循环将其添加到序列中,取得它作为翻转该图像的输入。
获取文件的逻辑是activity1的Execute方法,并且在activity2的Execute方法中翻转图像。
提前致谢
答案 0 :(得分:2)
var workflow = new Sequence();
Variable<Dictionary<string,object>> variable = new Variable<Dictionary<string,object>>
{
Name = "SharedData"
};
workflow.Variables.Add(variable);
foreach (MyCustomActivity activity in mAddedActivities)
{
workflow.Activities.Add(activity);
}
WorkflowInvoker invoker = new WorkflowInvoker(workflow);
invoker.Invoke();
这就是我对实际实现所做的,不需要任何参与/争论,变量“共享数据”足以保存跨活动的数据。
现在,在重写代码活动“执行”方法的每个活动级别,您必须使用此代码摘录来获取输入/获取此工作流变量“SharedData”的值。
WorkflowDataContext dataContext = context.DataContext;
PropertyDescriptorCollection propertyDescriptorCollection = dataContext.GetProperties();
foreach (PropertyDescriptor propertyDesc in propertyDescriptorCollection)
{
if (propertyDesc.Name == "SharedData")
{
myData = propertyDesc.GetValue(dataContext) as Dictionary<string, object>;
if (myData == null) //this to check if its the initial(1st) activity.
myData = new Dictionary<string, object>();
//I'm adding here an additional value into the workflow variable
//its having signature same as that of workflow variable
//dictionary's key as what it is and value as an object
//which user can cast to what actually one wants.
myData.Add("islogonrequired", Boolean.TrueString);
//here I'm fetching some value, as i entered it in my previous activity.
string filePath = myData["filepath"].ToString();
propertyDesc.SetValue(dataContext, myData);
break;
}
}
希望这可以帮助别人.. 谢谢其他所有人的支持。
答案 1 :(得分:0)
var workflow = new Sequence();
//Variable<string> v = new Variable<string>
//{
// Name = "str"
//};
//workflow.Variables.Add(v);
Dictionary<string, object> abc = new Dictionary<string, object>();
abc.Add("thedata", "myValue");
foreach (MyCustomActivity activity in mAddedActivities)
{
if (activity.ActivityResult == null)
activity.ActivityResult = new Dictionary<string, object>();
activity.ActivityResult = abc;
workflow.Activities.Add(activity);
//new Assign<string>
// {
// To = v,
// Value = activity.ActivityResult["thedata"].ToString()
// };
}
WorkflowInvoker invoker = new WorkflowInvoker(workflow);
invoker.Invoke();
这就是我所做的,不知何故,它正在发挥作用。我不确定它是正确的方法,建议我一些意思!!,这里ActivityResult是通过某种接口成员在各种添加的活动之间共享的属性..