为单元测试等非WebBase的项目伪造一个HttpContext , Session 和HttpHeader

时间：2011-03-31 来源：听说读写

在做单元测试的时候HttpContext.Current是为null的

而有些dll是和HttpContext绑定的(很大原因是...net大部分用于web项目)

或者是试图在windows form 或者console中使用这些dll就挂了...

当然HttpContext.Current是可以赋值的...那么最最简单的方法就是直接new一个HttpContext给它啦

HttpRequest request = new HttpRequest("", "http://localhost", "");
            HttpContext.Current = new HttpContext(request, new HttpResponse(new System.IO.StringWriter()));

好吧如果需要Session的话还需要添加下面的代码

System.Web.SessionState.SessionStateUtility.AddHttpSessionStateToContext(
                                                                                             HttpContext.Current, new HttpSessionStateContainer
                                                                                               ("",
                                                                                                   new SessionStateItemCollection(),
                                                                                                   new HttpStaticObjectsCollection(),
                                                                                                   20000,
                                                                                                   true,
                                                                                                   HttpCookieMode.UseCookies,
                                                                                                   SessionStateMode.Off,
                                                                                                   false
                                                                                               )
                                                                                            );

问题又出现了......有的代码会读取HttpHeader...例如ip什么的经常就存储在这里

更郁闷的是HttpContext的类经常是不能设置HttpHeader的.....

因为这个是只读的.......

其实只读这东西在.net中基本是骗人的.也就编译时有点用

到运行时别说只读了连private 都可以通过反射弄出来

那么就用反射赋值给httpheader吧

var instance = HttpContext.Current.Request.ServerVariables;
                Type type = instance.GetType();
                BindingFlags temp = BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static;

                MethodInfo addStatic = null;
                MethodInfo makeReadOnly = null;
                MethodInfo makeReadWrite = null;


                MethodInfo[] methods = type.GetMethods(temp);
                foreach (MethodInfo method in methods)
                {
                    switch (method.Name)
                    {
                        case "MakeReadWrite": makeReadWrite = method;
                            break;
                        case "MakeReadOnly": makeReadOnly = method;
                            break;
                        case "AddStatic": addStatic = method;
                            break;
                    }
                }

                makeReadWrite.Invoke(instance, null);
                List<string[]> list = new List<string[]>();
                string ip = ServiceContext.IPAddress;
                list.Add(new string[] { "HTTP_X_FORWARDED_FOR", ip });
                list.Add(new string[] { "HTTP_CLIENT_IP", ip });
                list.Add(new string[] { "HTTP_X_FORWARDED", ip });
                list.Add(new string[] { "HTTP_X_CLUSTER_CLIENT_IP", ip });
                list.Add(new string[] { "HTTP_FORWARDED_FOR", ip });
                list.Add(new string[] { "HTTP_FORWARDED", ip });
                list.Add(new string[] { "REMOTE_ADDR", ip });
                foreach (string[] values in list)
                    addStatic.Invoke(instance, values);
                makeReadOnly.Invoke(instance, null);