之前,我通过4篇文章介绍了在WF4中开发基于事件的工作流的范例。请参考下面的链接。
Workflow Foundation 4.0中的事件驱动流程设计和应用(一)
Workflow Foundation 4.0中的事件驱动流程设计和应用(二)
Workflow Foundation 4.0中的事件驱动流程设计和应用(三)
Workflow Foundation 4.0中的事件驱动流程设计和应用(四)
这一篇是这个系列的最后一篇,介绍如何通过配置文件,而不是代码的方式启动宿主。这在现实工作中是相当有用的,请大家参考下面的实例。
【注意】有朋友也问到单独用数据库存储业务方面的数据,那是没有错的。一般可以通过自定义的Activity去完成这些操作,都是标准的ADO.NET的数据访问操作。这里就不做展开了。
这个案例的最终代码范例,请通过 这里 下载
1.修改之前的Host代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.Activities;
using System.ServiceModel.Activities;
using System.ServiceModel.Description;
using System.Activities.DurableInstancing;
using System.Runtime.DurableInstancing;
using System.Activities.Persistence;
using System.ServiceModel.Activities.Description;
using System.Xml.Linq;
namespace Host
{
class Program
{
static void Main(string[] args)
{
var host = new WorkflowServiceHost(
new DocumentReviewLib.DocumentReviewWorkflow(),
new Uri("http://localhost:8080/DRS"));
host.AddDefaultEndpoints();//这个方法是添加了一些标准的端点
host.Description.Behaviors.Add(
new ServiceMetadataBehavior() { HttpGetEnabled = true });
var store = new SqlWorkflowInstanceStore("server=(local)//sqlexpress;database=WF4;integrated security=true");
host.UnknownMessageReceived += (o, e) =>
{
Console.WriteLine("/n" + e.Message + "/n");
};
host.Description.Behaviors.Add(
new WorkflowIdleBehavior()
{
TimeToPersist = TimeSpan.FromSeconds(0)
});
XNamespace xNS = XNamespace.Get("http://xizhang.com/DocumentReview");
store.Promote("DocumentReview",
new List
() { xNS.GetName(
"TicketId") },
null);
host.WorkflowExtensions.Add(
new Extensions.MyInstanceStoreParticpant());
host.DurableInstancingOptions.InstanceStore = store;
host.Open();
var common =
new ServiceHost(
typeof(CommonService),
new Uri(
"http://localhost:8080/Common"));
common.AddServiceEndpoint(
typeof(ICommonService).FullName,
new BasicHttpBinding(),
"");
common.Open();
Console.WriteLine(
"Server is ready.");
Console.Read();
}
}
[ServiceContract]
public
interface ICommonService
{
[OperationContract]
int[] GetTicketIds();
}
public
class CommonService : ICommonService
{
public
int[] GetTicketIds()
{
var ctx =
new InstanceStoreDataContext();
return ctx.DocumentReviewTasks.Select(r => (
int)r.TicketId).ToArray();
}
}
}
2. 修改之后的Host代码(请大家比较一下有何区别)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.Activities;
using System.ServiceModel.Activities;
using System.ServiceModel.Description;
using System.Activities.DurableInstancing;
using System.Runtime.DurableInstancing;
using System.Activities.Persistence;
using System.ServiceModel.Activities.Description;
using System.Xml.Linq;
namespace Host
{
class Program
{
static void Main(string[] args)
{
var host = new WorkflowServiceHost(
new WorkflowService() {
ConfigurationName = "DocumentReviewLib.DocumentReviewWorkflow",
Body = new DocumentReviewLib.DocumentReviewWorkflow()
});
//这里可以通过进一步的Behavior定制来简化。此处略
XNamespace xNS = XNamespace.Get("http://xizhang.com/DocumentReview");
var store = (SqlWorkflowInstanceStoreBehavior)host.Description.Behaviors.FirstOrDefault(b => b.GetType() == typeof(SqlWorkflowInstanceStoreBehavior));
store.Promote("DocumentReview",
new List
() { xNS.GetName(
"TicketId") },
null);
//这里可以通过进一步的Behavior定制来简化。此处略
host.WorkflowExtensions.Add(
new Extensions.MyInstanceStoreParticpant());
host.Open();
var common =
new ServiceHost(
typeof(CommonService));
common.Open();
Console.WriteLine(
"Server is ready.");
Console.Read();
}
}
[ServiceContract]
public
interface ICommonService
{
[OperationContract]
int[] GetTicketIds();
}
public
class CommonService : ICommonService
{
public
int[] GetTicketIds()
{
var ctx =
new InstanceStoreDataContext();
return ctx.DocumentReviewTasks.Select(r => (
int)r.TicketId).ToArray();
}
}
}
3.添加的app.config文件内容
"1.0" encoding="utf-8" ?>
"Host.Properties.Settings.WF4ConnectionString" connectionString=
"Data Source=./sqlexpress;Initial Catalog=WF4;Integrated Security=True"
providerName=
"System.Data.SqlClient" />
"WorkflowService">
"Host.Properties.Settings.WF4ConnectionString"/>
"0" timeToUnload=
"0"/>
"true"/>
"DocumentReviewLib.DocumentReviewWorkflow" behaviorConfiguration=
"WorkflowService">
"http://localhost:8080/DRS"/>
"IDocumentReview" address=
"" binding=
"basicHttpBinding">
"Host.CommonService">
"http://localhost:8080/Common"/>
"Host.ICommonService" binding=
"basicHttpBinding" address=
"">
这个案例的最终代码范例,请通过 这里 下载