WF4.0 应用篇(三) IActivityTemplateFactory

 

System.Activities.Presentation.IActivityTemplateFactory 模板

如果不想让用户设置Activity的所有属性，而希望很多属性都已按默认方式设置完成,可以使用IActivityTemplateFactory

简单的说，它就象是预先配置好的开箱即用的活动。一个简单的例子就是VS工具箱中Messaging分类下的ReceiveAndSendReply活动。但在System.Activities 程序集中并没有这个活动，它只是被称作ReceiveAndSendReply的IActivityTemplate。

 

接口

public interface IActivityTemplateFactory

{

Activity Create(DependencyObject target);

}

 

在Create方法中，可以创建预先配置好参数与属性的Activity

 

基本使用

myActivityA

public sealed class myActivityA : System.Activities.Presentation.IActivityTemplateFactory

{

 

public Activity Create(DependencyObject target)

{

System.Activities.Statements.Sequence sequence = new System.Activities.Statements.Sequence();

sequence.DisplayName = "wxwinter sequence";

 

System.Activities.Statements.WriteLine writeLine = new System.Activities.Statements.WriteLine();

writeLine.Text = new InArgument<string>("hello wxwinter");

writeLine.DisplayName = "wxwinter writeline";

 

sequence.Activities.Add(writeLine);

 

return sequence;

}

}

 

myActivityA 会出现在工具栏上

 

在设计器中使用

 

添加变量

public sealed class myActivityB : System.Activities.Presentation.IActivityTemplateFactory

{

 

 

public Activity Create(DependencyObject target)

{

 

var v1 = new Variable<string>() { Name = "v1", Default = "wxd" };

var v2 = new Variable<string>() { Name = "v2", Default = "wxwinter" };

var v3 = new Variable<string>() { Name = "v3", Default = "lzm" };

return new Sequence

{

Variables = { v1,v2,v3 },

Activities =

{

new WriteLine

{

Text = new VisualBasicValue<string>("v1")

}

 

}

};

}

 

}

 

 

改变设计器字体颜色

public class myActivityC : System.Activities.Presentation.IActivityTemplateFactory

{

 

 

public Activity Create(DependencyObject target)

{

//target is System.Activities.Presentation.View.ActivityTypeDesigner

// System.Activities.Presentation.View.ActivityTypeDesigner is System.Activities.Presentation.View.DesignerWithHeader

// System.Activities.Presentation.View.DesignerWithHeader is System.Activities.Presentation.WorkflowViewElement

 

System.Activities.Presentation.WorkflowViewElement workflowViewElement = target as WorkflowViewElement;

 

workflowViewElement.Foreground = System.Windows.Media.Brushes.Red;

 

return new Sequence();

}

}

 

 

添加参数

public class myActivityD : System.Activities.Presentation.IActivityTemplateFactory

{

public Activity Create(DependencyObject target)

{

//target is System.Activities.Presentation.View.ActivityTypeDesigner

// System.Activities.Presentation.View.ActivityTypeDesigner is System.Activities.Presentation.View.DesignerWithHeader

// System.Activities.Presentation.View.DesignerWithHeader is System.Activities.Presentation.WorkflowViewElement

 

System.Activities.Presentation.WorkflowViewElement workflowViewElement = target as WorkflowViewElement;

 

var k = workflowViewElement.ModelItem.Root.Properties["Properties"].Collection;

 

k.Add(new DynamicActivityProperty

{

Name = "wxd",

Type = typeof(InArgument<string>),

Value = new InArgument<string>()

});

 

 

return new Sequence

{

 

Activities =

{

new WriteLine

{

Text = new VisualBasicValue<string>("wxd")

}

 

}

};

}

}