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Showing posts with the label MVC

Log exception to file in c# .net core application explained

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In production environment when any bug gets reported at that time as developer wants to get the exception details of bug to resolve the issue on high priority.
In some case there might be situation where exception is not logged in table but developer wants to check the bug immediately. for that purpose we need to write the
exception details including stack trace of bug in file. To implement this easily i am going to demonstrate the implementation of custom logging in file as below.

First we need to construct the exception and logger method in custom logger class as shown below.


public class CustomLogger { public static List<string> ConstructExceptionDetails(Exception ex,string FunctionName) { return new List<string>() { $"{DateTime.Now} - {FunctionName}", $"Exception: {ex.Message}", $"StackTrace: {ex.StackTrace}", $"InnerException: {ex.InnerException?.…
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Dependency injection in ASP.NET Core MVC controller explained step by step

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ASP.NET Core MVC controllers should request their dependencies explicitly via their constructors. In some instances, individual controller actions may require a service, and it may not make sense to request at the controller level. In this case, you can also choose to inject a service as a parameter on the action method.

With ASP.NET 5 MVC6, we get a feature called dependency injection baked right into the framework for us.

Dependency injection is a technique that follows the Dependency Inversion Principle, allowing for applications to be composed of loosely coupled modules. ASP.NET Core has built-in support for dependency injection, which makes applications easier to test and maintain.

ASP.NET Core's built-in support for constructor-based dependency injection extends to MVC controllers. By simply adding a service type to your controller as a constructor parameter, ASP.NET Core will attempt to resolve that type using its built in service container. Services are typically, but not alw…
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Introduction of Asp.net MVC Basics for beginners

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MVC is an architectural pattern which separates the representation and user interaction.
It's divided into three broader sections,

ModelViewController. 
Below is how each one of them handles the task.
View : The View is responsible for the look and feel.
Model: Model represents the real world object and provides data to the View.
Controller: The Controller is responsible for taking the end user request and loading the appropriate Model and View.

Advantages of ASP.NET MVC


Extensive support for TDD. With asp.net MVC, views can also be very easily unit tested.Complex applications can be easily managedSeparation of concerns. Different aspects of the application can be divided into Model, View and Controller.ASP.NET MVC views are light weight, as they do not use view-state.It provides extensive support for URL Routing that helps to make friendly URLs (means friendly for human as well as Search Engines).Support for existing ASP.NET features like membership and roles, authentication and authoriz…
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Security Exception in ASP.NET on shared hosting environment [solved]

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When i was trying to host my newly developed website on shared server and i stuck with following exception

Security Exception in ASP.NET

[SecurityException: Request failed.] System.Security.CodeAccessSecurityEngine.ThrowSecurityException(RuntimeAssembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandleInternal rmh, SecurityAction action, Object demand, IPermission permThatFailed) +165 System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Object assemblyOrString, PermissionSet granted, PermissionSet refused, RuntimeMethodHandleInternal rmh, SecurityAction action, Object demand, IPermission permThatFailed) +100 System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandleInternal rmh, Object assemblyOrString, SecurityAction action, Boolean throwException) +284 System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack cs, PermissionSet grants, Permissio…
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Dependency injection in MVC controller step by step

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ASP.NET Core MVC controllers should request their dependencies explicitly via their constructors. In some instances, individual controller actions may require a service, and it may not make sense to request at the controller level. In this case, you can also choose to inject a service as a parameter on the action method.

With ASP.NET 5 MVC6, we get a feature called dependency injection baked right into the framework for us. 

Dependency injection is a technique that follows the Dependency Inversion Principle, allowing for applications to be composed of loosely coupled modules. ASP.NET Core has built-in support for dependency injection, which makes applications easier to test and maintain.

ASP.NET Core's built-in support for constructor-based dependency injection extends to MVC controllers. By simply adding a service type to your controller as a constructor parameter, ASP.NET Core will attempt to resolve that type using its built in service container. Services are typically, but not al…
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Asp.Net MVC page life cycle quick overview

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There are seven main steps that happen when you make a request to an Asp.net MVC web applications.


Routing Asp.net Routing is the first step in MVC request cycle. Basically it is a pattern matching system that matches the request’s URL against the registered URL patterns in the Route Table. When a matching pattern found in the Route Table, the Routing engine forwards the request to the corresponding IRouteHandler for that request. The default one calls the MvcHandler. The routing engine returns a 404 HTTP status code against that request if the patterns is not found in the Route Table. When application starts at first time, it registers one or more patterns to the Route Table to tell the routing system what to do with any requests that match these patterns. An application has only one Route Table and this is setup in the Global.asax file of the application.


MvcHandler The MvcHandler is responsible for initiating the real processing inside ASP.NET MVC. MVC handler implements IHttpHa…
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All about tempdata in Asp.Net MVC

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Image
TempData in ASP.NET MVC is basically a dictionary object derived from TempDataDictionary. TempData stays for a subsequent HTTP Request as opposed to other options (ViewBag and ViewData) those stay only for current request. So, TempData can be used to maintain data between controller actions as well as redirects.

Note: Just like ViewData, typecasting and null checks required for TempData also in order to avoid errors.

Let’s see how we can use TempData in a practical scenario to pass data from one controller action to another.


//Controller Action 1 (TemporaryEmployee)public ActionResult TemporaryEmployee() { Employee employee = new Employee { EmpID = "121", EmpFirstName = "Imran", EmpLastName = "Ghani" }; TempData["Employee"] = employee; return RedirectToAction("PermanentEmployee"); } //Co…
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File extension validation using javascript in MVC

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This is article which demonstrate the validation of allowed file extension for upload of files in MVC using javascript. In this article i have used validation for valid image format like Jpeg, Jpg,Gif and png image format. If users ties to upload any other file apart from above mentioned file then the javascript function will shows proper message to user to select appropriate files.

I have used html input file control for uploading of files in MVC application.

following is the html code for it.


<body> <div style="height:50px; padding-bottom:20px;"> @using (@Html.BeginForm("Create","FileUpload",FormMethod.Post,new{ enctype = "multipart/form-data"})) { <input type="file" id="file1" name="sdf" style=" margin-top:0px;" onchange="if( CheckExtention(this.value) ) {parent.ShowHideImage(true);this.form.submit();}" /> } </div> </body>
and following is the ja…
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Asp.Net MVC best practices part 1

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If you decided to develop the application using Asp.Net MVC application and. I am going to demonstrate you to follow the best practices in MVC to develop the robust web application. If you want to log the exceptions occurs in controllers you need to write try catch blocks in each action method. This approach is also not recommended because you need to write try catch block in each action method. To get ride of this you can handle exceptions and log each exception by using centralized approach. These approaches are as follows

Do not inherit the Controller base class directly to your ControllersCreate new base custom controller class which inherits the base controller classInherit created base custom controller class to your controllersFollowing is the sample code which demonstrate the above best practices


public class BaseController : Controller { }
In above code I have inherited the controller class to custom base controller class and below is the code to use this created custom…
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