.Net WebAPI 访问其他项目层操作
1.首先，配置一个公用的WEBAPI服务接口：
using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.Http; using System.Web.Http; using WebAPIService.Utility; ---引用的层 using Exceptions; ---引用的层 namespace Syngenta.FWA.WebUI.Controllers { [RoutePrefix("api/AppService")] public class AppServiceController : ApiController { // GET api/<controller> public IEnumerable<string> Get() { return new string[] { "value1", "value2" }; } // GET api/<controller>/5 public string Get(string jsonParams) { return null; } //POST api/<controller> [Route("Post")] public IHttpActionResult Post([FromBody]JsonContainer container) { try { return Ok(container.GetObject()); } catch (Exception Ex) { ExceptionManager.Publish(Ex); return BadRequest(dEx.Message); } catch (Exception ex) { var cutomException = GetCustomException(ex); ExceptionManager.Publish(cutomException); return BadRequest(cutomException.Message); } } [Route("PostActionList")] public IHttpActionResult PostActionList(JsonContainer[] containerList) { try { object[] objList = new object[containerList.Length]; for (int i = 0; i < containerList.Length; ++i) objList[i] = containerList[i].GetObject(); return Ok(objList); } catch (Exception ex) { ExceptionManager.Publish(ex); return BadRequest(ex.Message + "=>" + ex.StackTrace); } } [Route("PostService")] [HttpPost] public IHttpActionResult PostService([FromBody]JsonContainer container) { try { return Ok(container.GetObjectFromService()); } catch (Exception ex) { return BadRequest(ex.Message + "=>" + ex.StackTrace); } } [Route("PostAction")] [HttpPost] public IHttpActionResult PostAction([FromBody]JsonContainer container) { try { return Ok(container.GetObjectFromAction()); } catch (Exception ex) { return BadRequest(ex.Message + "=>" + ex.StackTrace); } } // PUT api/<controller>/5 public void Put(int id, [FromBody]string value) { } // DELETE api/<controller>/5 public void Delete(int id) { } private Exception GetCustomException(Exception exception) { if (exception.GetType() == typeof(Exception)) { return exception; } if (exception.InnerException != null) { return GetCustomException(exception.InnerException); } return exception; } } }
2.在引用的项目层里添加JasonContainer类（即引用），用来访问对应的类 ，规则是以BL开头及以Service结尾的.cs文件，通过反射生产对应的类实例
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Reflection; namespace WebAPIService { public class JsonContainer { const string BusinessNamespace = "BusinessLayer."; const string ServiceNamespace = "WebAPIService.Implements."; const string AdapterNamespace = "WebAPIService.Adapter."; public string Class { get; set; } public string Action { get; set; } public Dictionary<string, object> Parameters { get; set; } public object GetObject() { if (this.Class.EndsWith("service", StringComparison.OrdinalIgnoreCase)) { var t = Type.GetType(ServiceNamespace + Class); if (t == null) t = Type.GetType(ServiceNamespace + "BL" + Class); object obj = Activator.CreateInstance(t); var method = FindMethod(t); return method.Invoke(obj, GetParameters(method)); } else { if (!Class.StartsWith("BL", StringComparison.OrdinalIgnoreCase)) Class = "BL" + Class; Assembly assembly = AssemblyProvider.Provider.GetAssembly(AssemblyProvider.BusinessAssembly); var t = assembly.GetType(BusinessNamespace + Class); object bl = Activator.CreateInstance(t); //BL class instance var method = FindMethod(t); //Find if there's adpater var tAdapter = Assembly.GetCallingAssembly().GetType(AdapterNamespace + Class + "Adapter"); if (tAdapter == null) { return CallMethod(bl, method); } else { object objAdapter = Activator.CreateInstance(tAdapter); MethodInfo methodAdapter = tAdapter.GetMethod(Action + "Convert"); if (methodAdapter == null) //No such Apdater method, invoke BL method directly return CallMethod(bl, method); return methodAdapter.Invoke(objAdapter, new object[] { Parameters, bl, method }); } } } private MethodInfo FindMethod(Type t) { var members = t.GetMember(Action, MemberTypes.Method, BindingFlags.Public | BindingFlags.Instance); if (members.Length == 1) return members.Single() as MethodInfo; else if (members.Length > 1) { var methods = members.Cast<MethodInfo>().Where(m => m.GetParameters().Length == this.Parameters.Count); foreach (var m in methods) //Find method with consistent parameter names { var matched = m.GetParameters().Select(p => p.Name).SequenceEqual(this.Parameters.Keys); if (matched) return m; } } throw new EntryPointNotFoundException(String.Format("{0} Not Found in {1}", Action, Class)); } [Obsolete] public object GetObjectFromService() { Type t = Type.GetType(ServiceNamespace + Class); object obj = Activator.CreateInstance(t); MethodInfo method = t.GetMethod(Action); if (method.GetParameters().Length > 0) return method.Invoke(obj, new object[] { Parameters }); else return method.Invoke(obj, null); } [Obsolete] public object GetObjectFromAction() { Assembly assembly = AssemblyProvider.Provider.GetAssembly(AssemblyProvider.BusinessAssembly); Type t = assembly.GetType(BusinessNamespace + Class); object obj = Activator.CreateInstance(t); MethodInfo method = t.GetMethod(Action); Type tAdapter = Type.GetType(AdapterNamespace + Class + "Adapter"); object objAdapter = Activator.CreateInstance(tAdapter); MethodInfo methodAdapter = tAdapter.GetMethod(Action + "Convert"); return methodAdapter.Invoke(objAdapter, new object[] { Parameters, obj, method }); } private object CallMethod(object bl, MethodInfo method) { var pValues = GetParameters(method); return method.Invoke(bl, pValues); } /// <summary> /// Generete parameters order by the method's signature /// </summary> /// <param name="method"></param> /// <returns></returns> private object[] GetParameters(MethodInfo method) { var pValues = method.GetParameters().Select(p => { var value = this.Parameters.Single(p2 => p2.Key.Equals(p.Name, StringComparison.OrdinalIgnoreCase)).Value; return value == null || value.GetType() == p.ParameterType ? value : Convert.ChangeType(value, p.ParameterType); }).ToArray(); if (pValues.Length == 0) return null; return pValues; } } }
3.在引用的项目层里添加AssemblyProvider.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Reflection; namespace WebAPIService { public class AssemblyProvider { static readonly AssemblyProvider instance = new AssemblyProvider(); public const string BusinessAssembly = "BusinessLayer"; static readonly Assembly businessAssembly = Assembly.Load(BusinessAssembly); static AssemblyProvider() { } AssemblyProvider() { } public Assembly GetAssembly(string assembleName) { if (assembleName == BusinessAssembly) return businessAssembly; return null; } public static AssemblyProvider Provider { get { return instance; } } } }
4.WebAPIConig.cs
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Http; using System.Web.Mvc; using System.Web.Optimization; using System.Web.Routing; namespace Syngenta.FWA.WebUI { public class WebApiApplication : System.Web.HttpApplication { protected void Application_Start() { AreaRegistration.RegisterAllAreas(); GlobalConfiguration.Configure(WebApiConfig.Register); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); } } }
前台代码可以配置一个公用的访问层来调用webapi (以AngularJS为例）
(function () { 'use strict'; angular .module('fwa') .factory('webapi', webapi); webapi.$inject = ['$http', '$httpParamSerializer']; function webapi($http, $httpParamSerializer) { return { post: function (className, actionName, parameters) { return $http({ method: 'POST', url: 'api/AppService/Post', data: JSON.stringify({ Class: className, Action: actionName, Parameters: parameters }) }); }, getMenu: function () { return $http({ method: 'get', url: 'api/Security' }); }, postList: function (actionList) { return $http({ method: 'POST', url: 'api/AppService/PostActionList', data: JSON.stringify(actionList) }); } } } })();
