c# - 在 WF 4 中使用 ActivityBuilder 从用户那里获取输入

Question

我正在尝试编写一个简单的活动，该活动从用户那里收到其名称并打印“hello + username”消息。

问题是我无法通过代码访问用户名输入。

功能是：

static ActivityBuilder CreateTask1()
    {
        Dictionary<string, object> properties = new Dictionary<string, object>();
        properties.Add("User_Name", new InArgument<string>());

        var res = new ActivityBuilder();

        res.Name = "Task1";

        foreach (var item in properties)
        {
            res.Properties.Add(new DynamicActivityProperty { Name = item.Key, Type = item.Value.GetType(), Value = item.Value });
        }

        Sequence c = new Sequence();

        c.Activities.Add(new WriteLine { Text = "Hello " + properties["User_Name"] });

        res.Implementation = c;

        return res;
    }

跟随的输出将始终是“Hello User_Name”。

谢谢！

Answer 1

好的，我找到了答案（以及新的神奇“VisualBasicValue”类）：

static ActivityBuilder CreateTask1()
    {
        Dictionary<string, object> properties = new Dictionary<string, object>();
        properties.Add("User_Name", new InArgument<string>());

        var res = new ActivityBuilder();

        res.Name = "Task1";

        foreach (var item in properties)
        {
            res.Properties.Add(new DynamicActivityProperty { Name = item.Key, Type = item.Value.GetType(), Value = item.Value });
        }

        Sequence c = new Sequence();

        c.Activities.Add(new WriteLine { Text = new VisualBasicValue<string> { ExpressionText = "\"Hello \" + User_Name" } });

        res.Implementation = c;

        return res;
    }