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Articles by Nizamuddin Siddiqui
Page 177 of 196
How to get the Unix timestamp in C#
A Unix timestamp is mainly used in Unix operating systems. But it is helpful for all operating systems because it represents the time of all time zones.Unix Timestamps represent the time in seconds. The Unix epoch started on 1st January 1970.So, Unix Timestamp is the number of seconds between a specific dateExampleto get the Unix Timestamp Using DateTime.Now.Subtract().TotalSeconds Methodclass Program{ static void Main(string[] args){ Int32 unixTimestamp = (Int32)(DateTime.Now.Subtract(new DateTime(1970, 1, 1))).TotalSeconds; Console.WriteLine("The Unix Timestamp is {0}", unixTimestamp); Console.ReadLine(); } }Output1596837896Exampleto get the Unix Timestamp Using DateTimeOffset.Now.ToUnixTimeSeconds() ...
Read MoreHow to create an array with non-default repeated values in C#?
We can create an array with non-default values using Enumerable.Repeat(). It repeated a collection with repeated elements in C#. Firstly, set which element you want to repeat and how many times.Example 1class Program{ static void Main(string[] args){ var values = Enumerable.Repeat(10, 5); foreach (var item in values){ System.Console.WriteLine(item); } Console.ReadLine(); } }Output10 10 10 10 10Example 2class Program{ static void Main(string[] args){ int[] values = Enumerable.Repeat(10, 5).ToArray(); foreach (var item in values){ System.Console.WriteLine(item); } Console.ReadLine(); } }Output10 10 10 10 10
Read MoreHow to make use of both Take and Skip operator together in LINQ C#?
The Take operator is used to return a given number of elements from an array and the Skip operator skips over a specified number of elements from an array.Skip, skips elements up to a specified position starting from the first element in a sequence.Take, takes elements up to a specified position starting from the first element in a sequence.Example 1class Program{ static void Main(string[] args){ List numbers = new List { 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 5, 6, 7, ...
Read MoreWhat is Shallow Copy and how it is different from Deep Copy in C#?
Shallow Copy −A shallow copy of an object copies the "main" object, but doesn’t copy the inner objects.The "inner objects" are shared between the original object and its copy.The problem with the shallow copy is that the two objects are not independent. If you modify the one object, the change will be reflected in the other object.Deep Copy −A deep copy is a fully independent copy of an object. If we copied our object, we would copy the entire object structure.If you modify the one object, the change will not be reflected in the other object.Exampleclass Program{ static void ...
Read MoreHow can we create a LOG filter for Logging purposes in C# ASP.NET WebAPI?
Action filters are used to add extra logic before or after action methods execution. The OnActionExecuting and OnActionExecuted methods are used to add our logic before and after an action method is executed.Let us create create a LogAttribute that implemets ActionFilterAttribute which logs some information before and after action method execution.LogAttribute −Exampleusing System; using System.Diagnostics; using System.Web.Http.Controllers; using System.Web.Http.Filters; namespace DemoWebApplication.Controllers{ public class LogAttribute : ActionFilterAttribute { public override void OnActionExecuting(HttpActionContext actionContext){ Debug.WriteLine(string.Format("Action Method {0} executing at {1}", actionContext.ActionDescriptor.ActionName, DateTime.Now.ToShortDateString()), ...
Read MoreHow to do versioning with custom media type in C# ASP.NET WebAPI?
Media types allow an API to inform the client how to interpret the data in the payload. In the HTTP protocol, Media Types are specified with identifiers like text/html, application/json, and application/xml, which correspond to HTML, JSON, and XML respectively, the most common web formats. There are other more APIspecific Media Types as well, such as application/vnd.api+json.Below are versions that needs to be send in media types.application/vnd.demo.students.v1+json StudentsV1Controller application/vnd.demo.students.v2+json StudentsV2ControllerAdding our own CustomControllerSelector will fix the above error.CustomControllerSelector −Exampleusing System.Linq; using System.Net.Http; using System.Text.RegularExpressions; using System.Web.Http; using System.Web.Http.Controllers; using System.Web.Http.Dispatcher; namespace WebAPI.Custom{ public class CustomControllerSelector : DefaultHttpControllerSelector{ ...
Read MoreHow to do versioning with accept header in C# ASP.NET WebAPI?
The Accept header tells the server in what file format the browser wants the data. These file formats are more commonly called as MIME-types. MIME stands for Multipurpose Internet Mail Extensions.Versioning can be send in Headers like below.Version=1 StudentsV1Controller Version=2 StudentsV2ControllerSince we have not handled the version in accept headers, we are getting 404 not found error as we only have StudentV1 and StudentV2 controller. Let us add our own CustomControllerSelector which implements the DefaultHttpControllerSelector class.CustomControllerSelector −Exampleusing System.Linq; using System.Net.Http; using System.Web.Http; using System.Web.Http.Controllers; using System.Web.Http.Dispatcher; namespace WebAPI.Custom{ public class CustomControllerSelector : DefaultHttpControllerSelector{ private HttpConfiguration _config; ...
Read MoreHow can we create an exception filter to handle unhandled exceptions in C#\\nASP.NET WebAPI?
An exception filter is executed when a controller method throws any unhandled exception that is not an HttpResponseException exception. The HttpResponseException type is a special case, because it is designed specifically for returning an HTTP response.Exception filters implement the System.Web.Http.Filters.IExceptionFilter interface. The simplest way to write an exception filter is to derive from the System.Web.Http.Filters.ExceptionFilterAttribute class and override the OnException method.Below is a filter that converts NotFiniteNumberException exceptions into HTTP status code 416, Requested Range Not Satisfiable.ExceptionFilterAttribute −Exampleusing System; using System.Net; using System.Net.Http; using System.Web.Http.Filters; namespace DemoWebApplication.Controllers{ public class ExceptionAttribute : ExceptionFilterAttribute{ public override void OnException(HttpActionExecutedContext ...
Read MoreHow to do versioning with the Querystring parameter in C# ASP.NET WebAPI?
The DefaultHttpControllerSelector class in web api is responsible for selecting the appropriate controller action method that we send in the URI.Say we have to implement versioning in the query string like belowv=1 StudentsV1Controller (Version 1) v=2 StudentsV2Controller (Version 2)If we pass the versioning information in the query string like http://localhost:58174/api/student?v=1 will result in 404 Not Found error response because the SelectController() method which is present in DefaultHttpControllerSelector will look for the StudentsController but we have only StudentsV1Controller and StudentsV2Controller.To handle this case, we should add our own CustomControllerSelector which implements the DefaultHttpControllerSelector class.CustomControllerSelector −Exampleusing System.Net.Http; using System.Web; using System.Web.Http; using ...
Read MoreHow to do Web API versioning with URI in C# ASP.NET WebAPI?
Once a Web API service is made public, different client applications start using our Web API services. As the business grows and requirements change, we may have to change the services as well, but the changes to the services should be done in way that does not break any existing client applications.This is when Web API versioning helps. We keep the existing services as is, so we are not breaking the existing client applications, and develop a new version of the service that new client applications can start using.One of the option to implement versioning is by using URI. Below ...
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