WF4.0实战（十一）：邮件通知

    在工作流开发中，邮件通知是必不可少。这篇文章中，我将是使用WF4.0一步一步打造一个功能完整的邮件通知节点。

    首先，新建一个WorkflowConsoleApplication项目，改名为MailNoticeDemo，如下图：

    添加一个CodeActivity活动命名为MailNotice，添加一个ActivityDesigner活动命名为MailNoticeDesigner。项目结构如下图：

MailNotice用于写发送邮件的业务逻辑，MailNoticeDesigner用于设计活动的界面，现在MailNotice和MailNoticeDesigner是没有任何关联的，我们在MailNotice类上添加[Designer(typeof(MailNoticeDesigner))]，关联MailNotice和MailNoticeDesigner，还需要引入System.ComponentModel命名空间，代码如下。

1. using System.Activities;
   using System.ComponentModel;
   using System.Activities.Presentation.Metadata;
   using System.Activities.Presentation.PropertyEditing;
   using System;
   namespace MailNoticeDemo
   {
   [Designer(typeof(MailNoticeDesigner))]
   public sealed class MailNotice : CodeActivity
   {

2.                  ………

3. }

这时，MailNotice和MailNoticeDesigner活动中还没有进行编码。在项目中引入一个邮件发送类MailHelper.cs，编写MailNotice代码，如下：

1. 
           
           
            
            
            
            
    
             
   
               [ 
              Designer( 
              typeof( 
              MailNoticeDesigner))] 
              
    
               
    public sealed class MailNotice : CodeActivity
    
               
    {
    
               
        public InArgument<string> Receive { get; set; }
    
               
        public InArgument<string> Subject { get; set; }
    
               
        public InArgument<string> Content { get; set; }
    
               
        public string Attachment { get; set; }
    
               
        static MailNotice()
    
               
        {
    
               
            AttributeTableBuilder builder = new AttributeTableBuilder();
    
               
            builder.AddCustomAttributes(typeof(MailNotice), "Attachment", new EditorAttribute(typeof(FilePickerEditor), typeof(DialogPropertyValueEditor)));
    
               
            MetadataStore.AddAttributeTable(builder.CreateTable());
    
               
        }
    
               
    
               
        // If your activity returns a value, derive from CodeActivity<TResult>
    
               
        // and return the value from the Execute method.
    
               
        protected override void Execute(CodeActivityContext context)
    
               
        {
    
               
    
               
            SMTP smtp = new SMTP("你邮箱地址·", "显示的名称", new string[] { Receive.Get(context) }, null, null, Subject.Get(context), Content.Get(context), new string[] { Attachment }, "邮件发送服务", 25, "你邮箱地址·", "你邮箱密码", false);
    
               
            try
    
               
            {
    
               
                smtp.Send();
    
               
            }
    
               
           catch (Exception ex)  
    
               
            { 
    
               
               string error = ex.Message; 
    
               
                if (ex.InnerException != null) 
    
               
                { 
    
               
                     error = ex.InnerException.Message;  
    
               
                }
    
               
                 Console.WriteLine("邮箱发送失败: " + error); 
    
               
             }
         }
    
               
    }
    
               
   设计MailNoticeDesigner活动的UI，设计UI之前让你可以先了解一下ExpressionTextBox。详见：expressiontextbox-101
   通过expressiontextbox和WPF的控件，设计UI界面如下：
    
   Xaml代码如下：
   
                   
                   
                    
                    
                    
                    
    
                     
    
                      
    
                       
    
                        
   <sap:ActivityDesigner x:Class="MailNoticeDemo.MailNoticeDesigner"
    
                        
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    
                        
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    
                        
       xmlns:sap="clr-namespace:System.Activities.Presentation;assembly=System.Activities.Presentation"
    
                        
       xmlns:sapc="clr-namespace:System.Activities.Presentation.Converters;assembly=System.Activities.Presentation"
    
                        
       xmlns:sapv="clr-namespace:System.Activities.Presentation.View;assembly=System.Activities.Presentation" 
    
                        
                         mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="221" d:DesignWidth="336">
    
                        
       <sap:ActivityDesigner.Resources>
    
                        
           <ResourceDictionary x:Uid="ResourceDictionary_1">
    
                        
               <sapc:ArgumentToExpressionConverter x:Uid="sadv:ArgumentToExpressionConverter_1" x:Key="ArgumentToExpressionConverter" />
    
                        
           </ResourceDictionary>
    
                        
           </sap:ActivityDesigner.Resources>
    
                        
           <Grid Height="190" Width="328">
    
                        
           <Grid.RowDefinitions>
    
                        
               <RowDefinition Height="28"></RowDefinition>
    
                        
               <RowDefinition  Height="28"></RowDefinition>
    
                        
               <RowDefinition  Height="54"></RowDefinition>
    
                        
               <RowDefinition Height="47" />
    
                        
               <RowDefinition Height="31*" />
    
                        
           </Grid.RowDefinitions>
    
                        
           <Grid.ColumnDefinitions>
    
                        
               <ColumnDefinition Width=".2*"></ColumnDefinition>
    
                        
               <ColumnDefinition Width=".8*"></ColumnDefinition>
    
                        
           </Grid.ColumnDefinitions>
    
                        
           <Label Content="收件人" Height="28" HorizontalAlignment="Left" Grid.Row="0" Grid.Column="0" Name="label1" VerticalAlignment="Top" />
    
                        
           <sapv:ExpressionTextBox  Grid.Row="0" Grid.Column="1"
    
                        
                                    OwnerActivity="{Binding Path=ModelItem}" 
    
                        
                                    Expression="{Binding Path=ModelItem.Receive, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
    
                        
                                    UseLocationExpression="False"   />
    
                        
           <Label Content="主题："  Grid.Row="1" Grid.Column="0"  HorizontalAlignment="Left"  Name="label2" VerticalAlignment="Top" />
    
                        
           <sapv:ExpressionTextBox  Grid.Row="1" Grid.Column="1"
    
                        
                                    OwnerActivity="{Binding Path=ModelItem}" 
    
                        
                                    Expression="{Binding Path=ModelItem.Subject, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
    
                        
                                    UseLocationExpression="False"   />
    
                        
           <Label Content="正文：" Grid.Row="2" HorizontalAlignment="Left"  Name="label3" VerticalAlignment="Top"   />
    
                        
           <sapv:ExpressionTextBox  Grid.Row="2" Grid.Column="1" 
    
                        
                                    OwnerActivity="{Binding Path=ModelItem}" 
    
                        
                                    Expression="{Binding Path=ModelItem.Content, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
    
                        
                                    UseLocationExpression="False" Margin="0,0,0,1" Grid.RowSpan="2" />
    
                        
   
    
                        
       </Grid>
    
                        
   </sap:ActivityDesigner>
    
                       
    
                      
    
                      
   
    
                     
    
                    
    
              
    
             
    
            
   这样我们就完成了这个邮件活动。测试一下。在Workflow1中拖入这个活动。输入收件人、主题、正文，如下图：
      
   设置附件，如下图：
    
   启动工作流发送邮件：

   1. WorkflowInvoker.Invoke(new Workflow1()); 

   你会发现这个活动的图标不够美观，让我们修改一下这个自定义活动的图标。 在MailNoticeDesigner.xaml中加入下面代码

    

   < sap : ActivityDesigner.Icon >

   1.         <DrawingBrush>

   2.             <DrawingBrush.Drawing>

   3.                 <ImageDrawing>

   4.                     <ImageDrawing.Rect>

   5.                         <Rect Location="0,0" Size="16,16" ></Rect>

   6.                     </ImageDrawing.Rect>

   7.                     <ImageDrawing.ImageSource>

   8.                         <BitmapImage UriSource="mail.ico" ></BitmapImage>

   9.                     </ImageDrawing.ImageSource>

   10.                 </ImageDrawing>

   11.             </DrawingBrush.Drawing>

   12.         </DrawingBrush>

   13.     </sap:ActivityDesigner.Icon>

   14. 设置图标mail.ico，将Build action设置为Resource，如下图：

   16. 看一下我们最终打造的邮件活动：

   18. 总结：这篇文章详细讲解了创建WF4.0一个自定义活动的完整过程,虽然很简单，但对创建自定义活动很有参考价值。

       代码：/Files/zhuqil/MailNoticeDemo.rar
       

原文链接： http://www.cnblogs.com/zhuqil/archive/2010/04/29/WFMAIL.html