Pick 类

定义

public ref class Pick sealed : System::Activities::NativeActivity

[System.Windows.Markup.ContentProperty("Branches")]
public sealed class Pick : System.Activities.NativeActivity

[<System.Windows.Markup.ContentProperty("Branches")>]
type Pick = class
    inherit NativeActivity

Public NotInheritable Class Pick
Inherits NativeActivity

继承

Object

Activity

NativeActivity

Pick

属性

ContentPropertyAttribute

示例

下面的代码示例演示如何创建 Pick 活动。 此示例来自 “使用选取活动” 示例。

static Activity CreateWF()
{
    Variable<string> name = new Variable<string>();
    Sequence body = new Sequence
    {
        Variables = { name },
        Activities =
        {
            new WriteLine { Text = "What is your name? (You have 5 seconds to answer)" },
            new Pick
            {
               Branches =
               {
                   new PickBranch
                    {
                       Trigger = new ReadString
                       {
                           Result = name,
                           BookmarkName = bookmarkName
                       },
                       Action = new WriteLine
                       {
                           Text = new InArgument<string>(env => "Hello " + name.Get(env))
                       }
                   },
                   new PickBranch
                    {
                       Trigger = new Delay
                       {
                           Duration = TimeSpan.FromSeconds(5)
                       },
                       Action = new WriteLine
                       {
                           Text = "Time is up."
                       }
                   }
               }
           }
       }
    };

    return body;
}

注解

此活动的行为与在响应事件时只执行多个活动之一类似 Switch<T> 。 选择要执行的操作由从一组事件中选择的事件定义。