DependencyProperty例子

依赖属性示例

最新推荐文章于 2022-02-25 18:19:43 发布

最新推荐文章于 2022-02-25 18:19:43 发布 · 118 阅读

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本文介绍了一个使用.NET Framework工作流服务的示例程序，通过Activity基类定义了两个依赖属性：Account用于存储账户金额，SuccessEvent则是在账户操作成功时触发的事件。

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Drawing;
using System.Linq;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Serialization;
using System.Workflow.Runtime;
using System.Workflow.Activities;
using System.Workflow.Activities.Rules;

namespace DependencyPropertyExample
{
    public partial class Activity1 : System.Workflow.ComponentModel.Activity
    {
        public Activity1()
        {
            InitializeComponent();
        }

        public static DependencyProperty AccountProperty = DependencyProperty.Register("Account", typeof(Int32), typeof(Activity1));

        [DescriptionAttribute("Account")]
        [CategoryAttribute("Account Category")]
        [BrowsableAttribute(true)]
        [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
        public Int32 Account
        {
            get
            {
                return ((Int32)(base.GetValue(Activity1.AccountProperty)));
            }
            set
            {
                base.SetValue(Activity1.AccountProperty, value);
            }
        }

        public static DependencyProperty SuccessEvent = DependencyProperty.Register("Success", typeof(EventHandler), typeof(Activity1));

        [DescriptionAttribute("Success")]
        [CategoryAttribute("Success Category")]
        [BrowsableAttribute(true)]
        [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
        public event EventHandler Success
        {
            add
            {
                base.AddHandler(Activity1.SuccessEvent, value);
            }
            remove
            {
                base.RemoveHandler(Activity1.SuccessEvent, value);
            }
        }

        protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
        {
            base.RaiseEvent(SuccessEvent,this,EventArgs.Empty);
            if (Account <= 1000)
            {
                Console.WriteLine("钱也太少了吧，要大于1000的");
            }
            else
            {
                Console.WriteLine("存好了，下回多存点啊");
            } 

            return base.Execute(executionContext);
        }
    }
}