例2：订单处理
顺序工作流如图：
后台代码：
代码
public sealed partial class OrderWorkflow : SequentialWorkflowActivity
{
public OrderWorkflow()
{
InitializeComponent();
}public int AccountId { get; set; }
private double accountAmount;
private bool accountExist;public int GoodsID { get; set; }
private double goodsAmount;
private bool goodsExist;private void AccountNull_ExecuteCode(object sender, EventArgs e)
{
Console.Write(" this is accountId : {0} is null ", AccountId.ToString());
}private void CheckAccount_ExecuteCode(object sender, EventArgs e)
{
switch (AccountId)
{
case 1001:
accountAmount = 100;
accountExist = true;
break;
case 1002:
accountAmount = 500;
accountExist = false;
break;
case 1003:
accountAmount = 1000;
accountExist = true;
break;
default:
accountAmount = 0;
accountExist = false;
break;
}
}private void CheckGoods_ExecuteCode(object sender, EventArgs e)
{
switch (GoodsID)
{
case 2001:
goodsAmount = 20;
goodsExist = true;
break;
case 2002:
goodsAmount = 30;
goodsExist = false;
break;
case 2003:
goodsAmount = 40;
goodsExist = true;
break;
default:
goodsAmount = 0;
goodsExist = false;
break;
}
}private void GoodsNull_ExecuteCode(object sender, EventArgs e)
{
Console.Write(" this is goodsId : {0} is null ", GoodsID.ToString());
}private void AmountNotEnough_ExecuteCode(object sender, EventArgs e)
{
Console.Write(" Sorry: your account's amount is {0}, this is goodsId's amount is {1} ", accountAmount.ToString(), goodsAmount.ToString());
}private void CalOrder_ExecuteCode(object sender, EventArgs e)
{
this.accountAmount -= goodsAmount;
Console.Write(" your order is success!! your account' amount is {0} ", this.accountAmount.ToString());
}
我们清楚这里涉及到账号和产品的验证过程，如何整个系统中不可能仅仅在订单处理过程中附带该过程
因此我们应尽可能的细化这些步骤。这就是自定义活动
第一验证账号信息：AccountActivity 活动名称应以Activity结尾
代码如下：
代码
public sealed partial class AccountActivity: Activity
{
public AccountActivity()
{
InitializeComponent();
}public static DependencyProperty AccountIdProperty = DependencyProperty.Register("AccountId", typeof(int), typeof(AccountActivity));[DescriptionAttribute(
"AccountId")]
[CategoryAttribute("AccountId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int AccountId
{
get
{
return ((int)(base.GetValue(AccountActivity.AccountIdProperty)));
}
set
{
base.SetValue(AccountActivity.AccountIdProperty, value);
}
}public static DependencyProperty AccountAmountProperty = DependencyProperty.Register("AccountAmount", typeof(double), typeof(AccountActivity));[DescriptionAttribute(
"AccountAmount")]
[CategoryAttribute("AccountAmount Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public double AccountAmount
{
get
{
return ((double)(base.GetValue(AccountActivity.AccountAmountProperty)));
}
set
{
base.SetValue(AccountActivity.AccountAmountProperty, value);
}
}
public static DependencyProperty AccountExistProperty = DependencyProperty.Register("AccountExist", typeof(bool), typeof(AccountActivity));[DescriptionAttribute(
"AccountExist")]
[CategoryAttribute("AccountExist Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public bool AccountExist
{
get
{
return ((bool)(base.GetValue(AccountActivity.AccountExistProperty)));
}
set
{
base.SetValue(AccountActivity.AccountExistProperty, value);
}
}protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
switch (AccountId)
{
case 1001:
AccountAmount = 100;
AccountExist = true;
break;
case 1002:
AccountAmount = 505;
AccountExist = false;
break;
default:
AccountAmount = 0;
AccountExist = false;
break;
}
Console.Write(" this accmountId is {0} exist is {1} ", AccountId.ToString(), AccountExist.ToString());
return base.Execute(executionContext);
}
}
第二产品信息验证
代码
public partial class GoodsActivity: Activity
{
public GoodsActivity()
{
InitializeComponent();
}public static DependencyProperty GoodsIdProperty = DependencyProperty.Register("GoodsId", typeof(int), typeof(GoodsActivity));[DescriptionAttribute(
"GoodsId")]
[CategoryAttribute("GoodsId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int GoodsId
{
get
{
return ((int)(base.GetValue(GoodsActivity.GoodsIdProperty)));
}
set
{
base.SetValue(GoodsActivity.GoodsIdProperty, value);
}
}public static DependencyProperty GoodsAmountProperty = DependencyProperty.Register("GoodsAmount", typeof(double), typeof(GoodsActivity));[DescriptionAttribute(
"GoodsAmount")]
[CategoryAttribute("GoodsAmount Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public double GoodsAmount
{
get
{
return ((double)(base.GetValue(GoodsActivity.GoodsAmountProperty)));
}
set
{
base.SetValue(GoodsActivity.GoodsAmountProperty, value);
}
}public static DependencyProperty GoodsExistProperty = DependencyProperty.Register("GoodsExist", typeof(bool), typeof(GoodsActivity));[DescriptionAttribute(
"GoodsExist")]
[CategoryAttribute("GoodsExist Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public bool GoodsExist
{
get
{
return ((bool)(base.GetValue(GoodsActivity.GoodsExistProperty)));
}
set
{
base.SetValue(GoodsActivity.GoodsExistProperty, value);
}
}protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
switch (GoodsId)
{
case 2001:
GoodsAmount = 50;
GoodsExist = true;
break;
case 2002:
GoodsAmount = 100;
GoodsExist = false;
break;
default:
GoodsAmount = 0;
GoodsExist = false;
break;
}
Console.Write("this GoodsId is {0} exist is {1} ", GoodsId.ToString(), GoodsExist.ToString());
return base.Execute(executionContext);
}
}
第三订单处理
代码
public sealed partial class OrderActivity : Activity
{
public OrderActivity()
{
InitializeComponent();
}public static DependencyProperty AccountIdProperty = DependencyProperty.Register("AccountId", typeof(int), typeof(OrderActivity));[DescriptionAttribute(
"AccountId")]
[CategoryAttribute("AccountId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int AccountId
{
get
{
return ((int)(base.GetValue(OrderActivity.AccountIdProperty)));
}
set
{
base.SetValue(OrderActivity.AccountIdProperty, value);
}
}public static DependencyProperty GoodsIdProperty = DependencyProperty.Register("GoodsId", typeof(int), typeof(OrderActivity));[DescriptionAttribute(
"GoodsId")]
[CategoryAttribute("GoodsId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int GoodsId
{
get
{
return ((int)(base.GetValue(OrderActivity.GoodsIdProperty)));
}
set
{
base.SetValue(OrderActivity.GoodsIdProperty, value);
}
}protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
Console.Write("this AccountId is {0} ", AccountId.ToString());
Console.Write("this GoodsId is {0} ", GoodsId.ToString());
return base.Execute(executionContext);
}
}
自定义活动到现在就都已经完成了。
来看看新工作流是什么样吧
新建顺序工作流
CustomerOrderActivity
两个工作流的任务是相同的。后者别前者更容易进行理解与维护，而产生的附加活动也能为其他工作流重用
需要指出的是 工作流的的各个活动的 属性可以互相绑定，而达到传递的目的
点击活动的属性。选择AccountID属性后点击后面的...弹出页面如图：
后台代码：
代码
public sealed partial class CustomerOrderActivity : SequentialWorkflowActivity
{
public CustomerOrderActivity()
{
InitializeComponent();
}
public static DependencyProperty AccountIdProperty = DependencyProperty.Register("AccountId", typeof(int), typeof(CustomerOrderActivity));[DescriptionAttribute(
"AccountId")]
[CategoryAttribute("AccountId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int AccountId
{
get
{
return ((int)(base.GetValue(CustomerOrderActivity.AccountIdProperty)));
}
set
{
base.SetValue(CustomerOrderActivity.AccountIdProperty, value);
}
}public static DependencyProperty GoodsIdProperty = DependencyProperty.Register("GoodsId", typeof(int), typeof(CustomerOrderActivity));[DescriptionAttribute(
"GoodsId")]
[CategoryAttribute("GoodsId Category")]
[BrowsableAttribute(true)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
public int GoodsId
{
get
{
return ((int)(base.GetValue(CustomerOrderActivity.GoodsIdProperty)));
}
set
{
base.SetValue(CustomerOrderActivity.GoodsIdProperty, value);
}
}
可以看出 工作流里 的代码很少了。更清爽了。因为主要的工作都已经在自定义活动中完成了。。。
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