Common core base portion HttpContext 'common operations

 

* 1: NetCore context, a global static package itself HttpContextHelper

* 2: configuration file read Json

{
 // IConfiguration have the Configuration injection, two access nodes, colon .GetSection ( "the AppSettings:" + name) 
   Configuration.GetSection ( "" ) .Value;
}

 

* 3: Reading Session

// first download session expansion nuget package Microsoft.aspnetcore.http.extensions 
services.AddSession (); // write ConfigureServices in; 
app.UseSession (); // write Configure the 
HttpContextHelper.Current.Session.GetString ( " pwdqrcodekey " );

 

* 4: general fitter controller, inherited from: the Attribute, IActionFilter
/ **************** /

public class LoginFltAttribute : Attribute, IActionFilter
{
/// <summary>
/// 执行后
/// </summary>
/// <param name="context"></param>
public void OnActionExecuted(ActionExecutedContext context)
{}

/// <summary>
/// 执行前
/// </summary>
/// <param name="context"></param>
public void OnActionExecuting(ActionExecutingContext context)
{}
}

 

1. Gets the name of the similarities and differences of the current controller

// string actionName = filterContext.ActionDescriptor.ActionName; //MVC5写法
   string actionName = filterContext.Controller.GetType().Name; //Core写法

 

-2 Returning to the similarities and differences between the data dictionary view

filterContext.Result = new ViewResult { ViewName = "error", ViewData = new ViewDataDictionary<Return_Msg>(msg) }; //MVC5写法

/ * The ViewDataDictionary not instance, multi-flash monitoring using ViewData, he constructed, he can use the * / 
the ViewDataDictionary <Return_Msg> = ViewData new new the ViewDataDictionary <Return_Msg> (((the Controller) filterContext.Controller) .ViewData, MSG) ;
filterContext.Result = new ViewResult() { ViewName = "error", ViewData = viewdata }; //Core的写法

 

 

-3. Attribute controller to get

filterContext.Controller.ViewBag.RightBtnView //MVC5写法
Controller controller = filterContext.Controller as Controller;
controller.ViewBag.RightBtnView = btnView; //Core写法

 

-4. The controller acquires parameters (variable type is pDesc ​​The ParameterDescriptor)

int zbid = Convert.ToInt32 (filterContext.ActionParameters [pDesc.ParameterName]); // MV5 wording 
int zbid = filterContext.ActionArguments [pDesc.Name] .ToString (); // Core wording 
filterContext.ActionDescriptor.Parameters. IList <The ParameterDescriptor> // set form storage 
filterContext.ActionDescriptor.Parameters [ 0 ] .Name // get the first name of the parameter, the parameter name can only get, get a value not corresponding to the key value 
filterContext.ActionArguments // dictionary form of argument list, you can get the key and value value, more flexible

 

-5. Get current list of parameters List

List < String > arrQueryKeys filterContext.HttpContext.Request.QueryString.AllKeys.ToList = (); // MV5 wording 
List < String > arrQueryKeys filterContext.HttpContext.Request.Form.Keys.ToList = (); // distal Form Form Parameter set 
KeyValuePair < String , Microsoft.Extensions.Primitives.StringValues> [] filterContext.HttpContext.Request.Query.ToArray KK = (); // parameter list address bar, where converted into an array, Core wording

 

-5.1 current list, get the specified parameters, to obtain the corresponding value with the specified key, keyName = specified key

int zbid= Convert.ToInt32(filterContext.HttpContext.Request.Params[keyName]); //MV5的写法
int zbid = Convert.ToInt32(filterContext.HttpContext.Request.Form.FirstOrDefault(i => i.Key == keyName).Value);

 

-6. To get access to the full address of the domain name last,

filterContext.HttpContext.Request.UrlReferrer.OriginalString; // head MVC5 determination request has no "Referer" is empty 
filterContext.HttpContext.Request.Headers [ " the Referer " ]; // Core

 

7. determines whether a request Ajax

filterContext.HttpContext.Request.IsAjaxRequest () // MC5 
is determined whether the request is determined whether Ajax head has Head "X-Requested-With: XMLHttpRequest ", with a = Ajax request
 public  static  BOOL IsAjaxRequest ( the this the HttpRequest Request)
{
   bool result = false;
   var xreq = request.Headers.ContainsKey("x-requested-with");
   if (xreq)
   result = request.Headers["x-requested-with"] == "XMLHttpRequest";
   return result;
}

 

8. register. Already registered, you can get through this

protected virtual T CreateService<T>()
{
   // typeof(T) ==>接口名
   return (T)this.HttpContext.RequestServices.GetService(typeof(T));
}