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EF6 CodeFirst+Repository+Ninject+MVC4+EasyUI实践(八) - wangweimutou 阅读原文»
前言
- 本篇幅将对系统的菜单管理模块进行说明，系统的菜单采用树形结构，这样可以更好地方便层级设计和查看。本示例将说明如何通过EntityFramework读取递归的菜单树形结构，以及结合EasyUI的treegrid在Asp.net MVC上显示树形菜单和管理操作。
Easyui-treegrid的使用方法
- 首先我们来看一下treegrid的基本使用方法。很简单，和easyui-datagrid差不多。
<table title="Folder Browser" class="easyui-treegrid" style="width:700px;height:250px"
data-options="
url: 'treegrid_data1.json',
method: 'get',
rownumbers: true,
idField: 'id',
treeField: 'name' ">
<thead>
<tr>
<th data-options="field:'name'" width="220">Name</th>
<th data-options="field:'size'" width="100" align="right">Size</th>
<th data-options="field:'date'" width="150">Modified Date</th>
</tr>
</thead>
</table>
data-options="
url: 'treegrid_data1.json',
method: 'get',
rownumbers: true,
idField: 'id',
treeField: 'name' ">
<thead>
<tr>
<th data-options="field:'name'" width="220">Name</th>
<th data-options="field:'size'" width="100" align="right">Size</th>
<th data-options="field:'date'" width="150">Modified Date</th>
</tr>
</thead>
</table>
- 之前说过data-options可以通过GET方式发送异步请求，读取json数据后就可以加载数据呢。Treegrid中的data-options有两个关键参数idField(主键字段)、treeField(显示字段)，上面很明显是利id作为主键字段，name作为显示字段。我们查看一下treegrid_data1.json文件究竟是怎样的格式。
[{
"id":1,
"name":"C",
"size":"",
"date":"02/19/2010",
"children":[{
"id":2,
"name":"Program Files",
"size":"120 MB",
"date":"03/20/2010",
"children":[{
"id":21,
"name":"Java",
"size":"",
"date":"01/13/2010",
"state":"closed",
"children":[{
"id":211,
"name":"java.exe",
"size":"142 KB",
"date":"01/13/2010"
},{
"id":212,
"name":"jawt.dll",
"size":"5 KB",
"date":"01/13/2010"
}]
},{
"id":1,
"name":"C",
"size":"",
"date":"02/19/2010",
"children":[{
"id":2,
"name":"Program Files",
"size":"120 MB",
"date":"03/20/2010",
"children":[{
"id":21,
"name":"Java",
"size":"",
"date":"01/13/2010",
"state":"closed",
"children":[{
"id":211,
"name":"java.exe",
"size":"142 KB",
"date":"01/13/2010"
},{
"id":212,
"name":"jawt.dll",
"size":"5 KB",
"date":"01/13/2010"
}]
},{
解析大型.NET ERP系统 分布式应用模式设计与实现 - James Li 阅读原文»
{
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo);
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath);
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath, ExcludeIncludeFieldsList fieldList);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression, IPrefetchPath2 prefetchPath);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression, IPrefetchPath2 prefetchPath, ExcludeIncludeFieldsList fieldList);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity, EntityCollection entitiesToDelete);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity, EntityCollection entitiesToDelete, string seriesCode);
void DeleteSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
bool IsSalesContractExist(Guid sessionId, String ContractNo);
bool IsSalesContractExist(Guid sessionId, IRelationPredicateBucket filterBucket);
int GetSalesContractCount(Guid sessionId, IRelationPredicateBucket filterBucket);
SalesContractEntity CloneSalesContract(Guid sessionId, String ContractNo);
void PostSalesContract(Guid sessionId, String ContractNo);
void PostSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
}
public class SalesContractManager : ManagerBase, ISalesContractManager
{
public SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo)
{
return GetSalesContract(sessionId, ContractNo, null);
}
public SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath)
{
return GetSalesContract(sessionId, ContractNo, prefetchPath, null);
}
BinaryServerFormatterSinkProvider provider = new BinaryServerFormatterSinkProvider();
provider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props = new Hashtable();
props["port"] = port;
TcpChannel channel = new TcpChannel(props, null, provider);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(ERP.BusinessLogic.SalesContractManager), "RemotingService", WellKnownObjectMode.SingleCall);
if (salesContractManager == null)
throw new AppException("Sever configuration error");
salesContractManager.SaveSalesContract(guid, salesContract);
Type[] types = assembly.GetTypes();
foreach (Type type in types)
{
if (type.Namespace == "ERP.BusinessLogic.Managers")
{
string serviceName = string.Empty;
object[] attributes = type.GetCustomAttributes(typeof(CommunicationService), true);
if (attributes.Length > 0)
serviceName = type.Name;
if (!string.IsNullOrEmpty(serviceName))
{
if (clientActivatedServices.Contains(serviceName))
{
RemotingConfiguration.RegisterActivatedServiceType(type);
}
else if (singletonServices.Contains(serviceName))
{
RemotingConfiguration.RegisterWellKnownServiceType(type, serviceName + ".rem", WellKnownObjectMode.Singleton);
}
else
{
RemotingConfiguration.RegisterWellKnownServiceType(type, serviceName + ".rem", WellKnownObjectMode.SingleCall);
}
}
C/S架构的应用程序，将一些复杂的计算逻辑由客户端转移到服务器端可以改善性能，同时也为了其它方面的控制。.NET Remoting在局域网内调用的性能相当不错。ERP系统中基于.NET Remoting和WCF构建一个应用程序服务器(Application Server)。
分布式应用设计目标：
1 客户端的连接，服务器要能控制。服务器根据授权许可文件的内容，控制客户端并发数。
2 服务器崩溃，客户端要得到通知，挂起当前数据输入操作，当服务器可用时，客户端可自动重新连接 。
3 支持数据加密，对敏感的数据可用加密的端口和通道传输。
4 支持数据压缩，改善数据传输效率，因为要做一个压缩与解压缩动作，性能有所降低。
5 安全控制，应用程序服务器阻止未授权的或未签名的应用程序的连接。
6 客户端向服务器传送大文件，传送图片需要时性能优化
7 服务器端发现错误时，支持堆栈传回客户端以诊断原因。
8 开发和部署简单方便。
先设计服务器与客户端通信的接口，一个简单销售合同数据表的访问接口代码如下所示。
public interface ISalesContractManager{
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo);
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath);
SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath, ExcludeIncludeFieldsList fieldList);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression, IPrefetchPath2 prefetchPath);
EntityCollection GetSalesContractCollection(Guid sessionId, IRelationPredicateBucket filterBucket, ISortExpression sortExpression, IPrefetchPath2 prefetchPath, ExcludeIncludeFieldsList fieldList);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity, EntityCollection entitiesToDelete);
SalesContractEntity SaveSalesContract(Guid sessionId, SalesContractEntity salesContractEntity, EntityCollection entitiesToDelete, string seriesCode);
void DeleteSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
bool IsSalesContractExist(Guid sessionId, String ContractNo);
bool IsSalesContractExist(Guid sessionId, IRelationPredicateBucket filterBucket);
int GetSalesContractCount(Guid sessionId, IRelationPredicateBucket filterBucket);
SalesContractEntity CloneSalesContract(Guid sessionId, String ContractNo);
void PostSalesContract(Guid sessionId, String ContractNo);
void PostSalesContract(Guid sessionId, SalesContractEntity salesContractEntity);
}
再设计服务实现SalesContractManager,实现上面的接口。
[CommunicationService("SalesContractManager")]public class SalesContractManager : ManagerBase, ISalesContractManager
{
public SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo)
{
return GetSalesContract(sessionId, ContractNo, null);
}
public SalesContractEntity GetSalesContract(Guid sessionId, String ContractNo, IPrefetchPath2 prefetchPath)
{
return GetSalesContract(sessionId, ContractNo, prefetchPath, null);
}
注意到上面给上面的实现类添加了CommunicationService特性，也就是声明实现类是一个服务。
先来回顾一下最简单的.NET Remoting 客户端与服务器端代码设计模式。
服务器端的设计：
int port = Convert.ToInt32(ConfigurationManager.AppSettings["Port"]);BinaryServerFormatterSinkProvider provider = new BinaryServerFormatterSinkProvider();
provider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props = new Hashtable();
props["port"] = port;
TcpChannel channel = new TcpChannel(props, null, provider);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(ERP.BusinessLogic.SalesContractManager), "RemotingService", WellKnownObjectMode.SingleCall);
这里是用代码写死服务类，可以用配置文件增加服务类，也可用以反射的方法增加服务类。
客户端调用的代码如下：
ISalesContractManager salesContractManager =(IPdmServer)Activator.GetObject(typeof(ISalesContractManager),string.Format("{0}RemotingService", ApplicationServerUrl));if (salesContractManager == null)
throw new AppException("Sever configuration error");
salesContractManager.SaveSalesContract(guid, salesContract);
改善服务器端代码，让服务器主动搜索系统中打上CommunicationService特性的服务类。当新增加服务类型时，框架可自动识别并加载服务类型：
Assembly assembly = typeof(Manager).Assembly;Type[] types = assembly.GetTypes();
foreach (Type type in types)
{
if (type.Namespace == "ERP.BusinessLogic.Managers")
{
string serviceName = string.Empty;
object[] attributes = type.GetCustomAttributes(typeof(CommunicationService), true);
if (attributes.Length > 0)
serviceName = type.Name;
if (!string.IsNullOrEmpty(serviceName))
{
if (clientActivatedServices.Contains(serviceName))
{
RemotingConfiguration.RegisterActivatedServiceType(type);
}
else if (singletonServices.Contains(serviceName))
{
RemotingConfiguration.RegisterWellKnownServiceType(type, serviceName + ".rem", WellKnownObjectMode.Singleton);
}
else
{
RemotingConfiguration.RegisterWellKnownServiceType(type, serviceName + ".rem", WellKnownObjectMode.SingleCall);
}
}