最精简的自定义.net 开发框架

一、 通过自定义的HttpModule和HttpHandler，重写url，自定义路由规则，实现 Web API功能。 简单说

       就是  请求路径 例如 service/method, 那么就指向当前应用app下某个services的某个方法method。

首先，实现IHttpModule，对于请求路径 符合自定义规则的，交给自定义的HttpHandler

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public class UrlRoutingModule : IHttpModule     {         //其他成员         public RouteCollection RouteCollection { get; set; }         public void Init(HttpApplication context)         {             context.PostResolveRequestCache += new EventHandler(this.OnApplicationPostResolveRequestCache);                }                   private void OnApplicationPostResolveRequestCache(object sender, EventArgs e)        {                    HttpContext context = ((HttpApplication)sender).Context;            string path = context.Request.AppRelativeCurrentExecutionFilePath;                         //为了解决iis6 中framework4.0 与 framework2.0共存的问题             if (path.EndsWith("/eurl.axd"))            {                path = path.Substring(0, path.Length - 9);            }              string[] pathArray = path.Split('/');            string fileName = pathArray[pathArray.Length - 1];                       if (fileName.IndexOf(".") > 0)            {                context.RemapHandler(HttpContext.Current.Handler);            }            else            {                PageRouteHandler handler = new PageRouteHandler();                context.RemapHandler(handler);            }        }           #region IHttpModule 成员           public void Dispose()         {                                    }           #endregion     }

　　

自定义的httphandler 实现 IHttpHandler接口

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public class PageRouteHandler : IHttpHandler     {         public bool IsReusable         {             get { return true; }           }           public void ProcessRequest(HttpContext context)         {             string result = string.Empty;             string path = context.Request.AppRelativeCurrentExecutionFilePath;             string[] pathArray = path.Split('/');             Func<HttpContext, string> handler = null;               string serviceName = string.Empty;             string methodName = string.Empty;             if (pathArray.Length >= 3)             {                 serviceName = pathArray[1];                 methodName = pathArray[2];             }               if (!string.IsNullOrEmpty(serviceName) && !string.IsNullOrEmpty(methodName))             {                 handler = GetWebMethod(serviceName + "." + methodName);                 if (handler != null)                 {                     result = handler(context);                 }             }             if (handler == null)             {                 result = "{\"result\":\"not exist handler service\"}";               }               if (context.Request.AcceptTypes != null && context.Request.AcceptTypes.Contains("application/json"))             {                 context.Response.ContentType = "application/json";             }               string callback = context.Request["jsoncallback"];             if (!string.IsNullOrEmpty(callback))             {                 result = callback + "(" + result + ")";                 context.Response.AddHeader("Access-Control-Allow-Origin", "*");             }               context.Response.Write(result);           } }

　　

自定义的 pageroutehandler的作用，就是处理合法请求时，通过委托方式调用请求的方法，并把结果返回。 获取委托时使用了缓存，getwebmethod 代码如下

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public static Dictionary<string, Func<HttpContext, string>> WebMethods      {          get          {              Dictionary<string, Func<HttpContext, string>> _webMethods = HttpRuntime.Cache["WebMethods"] as Dictionary<string, Func<HttpContext, string>>;              if (_webMethods == null)              {                  _webMethods = new Dictionary<string, Func<HttpContext, string>>();              }              return _webMethods;          }      }        public static Func<HttpContext, string> GetWebMethod(string classMethodName)      {          if (string.IsNullOrEmpty(classMethodName))          {              return null;          }          string[] arrClassMethod = classMethodName.Split('.');          if (arrClassMethod.Length != 2)          {              return null;          }            Func<HttpContext, string> handler = null;          if (!WebMethods.ContainsKey(classMethodName))          {                string binPath = AppDomain.CurrentDomain.RelativeSearchPath;              foreach (string dll in Directory.GetFiles(binPath))              {                  FileInfo fi = new FileInfo(dll);                  if (fi.Extension.Equals(".dll", StringComparison.CurrentCultureIgnoreCase) && !fi.Name.StartsWith("system.") && !fi.Name.StartsWith("microsoft."))                  {                      Assembly assembly = Assembly.LoadFile(dll);                      string typeName = assembly.GetName().Name + "." + arrClassMethod[0];                      Type type = assembly.GetType(typeName, false, true);                      if (type != null)                      {                          handler = (Func<HttpContext, string>)Delegate.CreateDelegate(typeof(Func<HttpContext, string>), type.GetMethod(arrClassMethod[1], BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Static, null, new Type[1] { typeof(HttpContext) }, null));                          WebMethods.Add(classMethodName, handler);                          break;                      }                  }              }                      }          else          {              handler = WebMethods[classMethodName];          }          return handler;      }

　　

二  使用规则。首先在web config 的<httpModules>加上<add name="RouteModule" type="LinWebAPI.UrlRoutingModule, LinWebAPI"/>（这里type就是 你自己定义的httpmodule的类的全名了）。

    只要你把你的后台类暴露出来给前台调用，定义方法符合    public static string  method(HttpContext context)   这个规则即可。

   假设 你有个模块的类 TestServices  下有个 方法  public  static  string TestMethod(HttpContext context), 那么前端页面 通过 ajax请求路径为  Testservices/testmethod,

  至于请求的参数，你可以通过?a=x&b=y这种方式加到请求路径后面，也可以放通过post方式提交  例如  jquery的 $.ajax(url,{a:x,b:y}....。

  而对于 方法 TestMethod(HttpContext context),要获取请求的参数，直接从 string a = context.Request["a"]  即可。

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对于iis6，要支持这种不带扩展名的请求路径，需要

1. 打开 IIS Microsoft 管理控制台 (MMC)，右键单击本地计算机名称，然后单击“属性”。
2. 单击“MIME 类型”。
3. 单击“新建”。
4. 在“扩展名”框中，键入星号 (*)。
5. 在“MIME 类型”框中，键入 application/octet-stream。

对于iis7，要支持这种不带扩展名的请求路径，需要

1 网站托管模式为 经典模式
2 处理程序映射--》添加脚本映射--》配置（请求路径：* ；可执行文件：C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll)