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Articles by Nizamuddin Siddiqui
Page 152 of 196
What is Content Negotiation in Asp.Net webAPI C#?
Content negotiation is the process of selecting the best representation for a given response when there are multiple representations available. Means, depending on the Accept header value in the request, the server sends the response. The primary mechanism for content negotiation in HTTP are these request headers −Accept − Which media types are acceptable for the response, such as "application/json, " "application/xml, " or a custom media type such as "application/vnd.example+xml"Accept-Charset − Which character sets are acceptable, such as UTF-8 or ISO 8859-1.Accept-Encoding − Which content encodings are acceptable, such as gzip.Accept-Language − The preferred natural language, such as "en-us".The ...
Read MoreWhat is the use of ChildActionOnly attribute in ASP .Net MVC C#?
Child Action is only accessible by a child request. It will not respond to the URL requests. If an attempt is made, a runtime error will be thrown stating - Child action is accessible only by a child request. Child action methods can be invoked by making child request from a view using Action() and RenderAction() html helpers.Child action methods are different from NonAction methods, in that NonAction methods cannot be invoked using Action() or RenderAction() helpers.Below is the Child Action Error when we try to invoke it using URL.ControllerExampleusing System.Collections.Generic; using System.Web.Mvc; namespace DemoMvcApplication.Controllers{ public class HomeController : ...
Read MoreWhat are the levels at which filters can be applied in ASP .Net MVC C#?
In an ASP .Net MVC application filters can be applied in three levels.Action Method LevelController LevelGlobal LevelAction Method LevelFilters that are applied at the Action Method level will work only particularly for that action method.using System.Web.Mvc; namespace DemoMvcApplication.Controllers{ public class HomeController : Controller{ [Authorize] //Action Method Level public string Index(){ return "Index Invoked"; } } }Controller LevelController level filters are applied to all the action methods. The following filter are applicable to all the action methods of the HomeController, but not on other controllers.using System.Web.Mvc; ...
Read MoreWhat are the three segments of the default route, that is present in ASP .Net MVC\\nC#?
The ASP.Net MVC Routing module is responsible for mapping incoming browser requests to particular MVC controller actions. When the ASP.NET MVC application launches then the application registers one or more patterns with the framework's route table to tell the routing engine what to do with any requests that matches those patterns. When the routing engine receives a request at runtime, it matches that request's URL against the URL patterns registered with it and gives the response according to a pattern match.ASP.NET introduced Routing to eliminate the needs of mapping each URL with a physical file. Routing enables us to define ...
Read MoreWhat is the significance of NonActionAttribute in ASP .Net MVC C#?
The NonAction attribute is used when we want a public method in a controller but do not want to treat it as an action method. An action method is a public method in a controller that can be invoked using a URL. So, by default, if we have any public method in a controller then it can be invoked using a URL request. To restrict access to public methods in a controller, NonAction attribute can be used.Now let us consider HomeController having two public methods MyMethod1 and MyMethod2.ControllerExampleusing System.Web.Mvc; namespace DemoMvcApplication.Controllers{ public class HomeController : Controller{ ...
Read MoreHow to use ViewBag in ASP .Net MVC C#?
ViewBag uses the dynamic feature that was introduced in to C# 4.0. It allows an object to have properties dynamically added to it. Internally, it is a dynamic type property of the ControllerBase class which is the base class of the Controller class.ViewBag only transfers data from controller to view, not visa-versa. ViewBag values will be null if redirection occurs. ViewBag is able to set and get value dynamically and able to add any number of additional fields without converting it to strongly typed.Storing data in ViewBag −ViewBag.Counties = countriesList;Retrieving data from ViewBag −string country = ViewBag.Countries;ControllerExampleusing System.Collections.Generic; using System.Web.Mvc; ...
Read MoreWhat are built-in message handlers in Asp.Net webAPI C#?
A message handler is a class that receives an HTTP request and returns an HTTP response. Message handlers derive from the abstract HttpMessageHandler class. Message handlers provide us the opportunity to process, edit, or decline an incoming request before it reaches the HttpControllerDispatcher.Message handlers are executed much earlier in the request processing pipeline, hence they are a great place to implement cross cutting concerns in Web API. Message Handlers are nothing but a chain of classes (it may be system defined or defined by us) that sits next to the process of HTTP request and response through a pipeline.For example, ...
Read MoreHow to create bars with gap among them if there are more categories using ggplot2 in R?
When the number of categories is large in numbers for a variable and we want to create a bar plot then the display of the bar plot becomes a little ambiguous because the bars are plotted very close to each other. To make the bars clearly visible, we can reduce the width of the bars and set different colors for them to make them visually attractive.geom_bar(width=0.2,color="red")Consider the below data frame −x
Read MoreHow to save the summary statistics into a data frame in R?
When we find the summary statistics of a data frame then the output is returned as a table and each of the column records the minimum, first quartile, median, median, third quartile, and maximum with their names. If we want to save this summary as a data frame then it is better to calculate it with apply function and store it as data.frame.ExampleConsider the below data frame − Live Demox1
Read MoreHow to determine the row that have min and max values in an R data frame column?
In data analysis, often we require to determine the minimum and maximum values because these values help us to understand the limits of a column or variable under consideration. This can be done by using which.max for maximum and which.min for minimum with single square brackets to extract the rows.ExampleConsider the below data frame − Live Demox1
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