Search Results for: webapi

$.ajax No ‘Access-Control-Allow-Origin’ header is present on the requested resource with WebAPI

Enrico

I want to get data from a WebAPI with jquery $("#btnSend").click(function () { $("#sending").show(); $.ajax({ type: ‘GET’, url: ‘/Report/SendEmail?quote=18’, crossDomain: true, success: function (msg) { if (msg == ‘True’) { alert(‘Email sent to the client’); } $("#sending").hide(); }, error: function (request, status, error) { $("#sending").hide(); } }); }); and it produce ‘No Access-Control-Allow-Origin’ header is present on the requested resource error. The solution is to add in the result of the WebAPI the following code: Response.Headers.Add(“Access-Control-Allow-Methods”, “GET, POST”); Response.Headers.Add(“Access-Control-Allow-Headers”, “accept, authority”); Response.Headers.Add(“Access-Control-Allow-Credentials”, “true”); Happy coding!

Upload/Download Files using HttpClient

Enrico
C# .NET language

In this new post, I show you how to upload/download files using HttpClient in C# and .NET Core. Creating a new version of the Markdown Editor component for Blazor, I face some issues with the file upload. So, I was working to find a solution and now I can tell you how to do it. First, I will take a look at how to send multipart MIME data to a Web API using HttpClient. We will create two applications to demonstrate the data transfer between the client side and the server side. The server-side…

How to Export Data to Excel in Blazor

Enrico

In this new post, I’m going to show how to export data to Excel in Blazor WebAssembly or Server. Creating and exporting data to Excel file is one of the frequently used feature in web apps. First, for creating an export in Excel, I will use a free library that is a NuGet package. ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API. So, you can download the full source…

Integration with C# and ReactJS

Enrico

The goal for this project is to show a list of books with ReactJS from a WebAPI written in C#. You can download this project from Github. New project Start by creating a new ASP.NET MVC 4 project: 1. File → New → Project 2. Select ".NET Framework 4" and Templates → Visual C# → Web → ASP.NET MVC 4 Web Application. Call it "CSReact" 3. In the "New ASP.NET MVC 5 (or 4) Project" dialog, select the MVC (or empty) template. Install ReactJS.NET We need to install ReactJS.NET to…

Customize Json result in Web API

Enrico

If you work with Visual Studio 2015 and WebAPI, this short post is for you! We have to make our Web API project easy to debug so, I’m going to remove the XML formatter. I’m doing that because I’m in a test project and I’d like to see the response in the browser. The easily way to force the response to Json for all Web API requests is to remove the XML. Obviously you shouldn’t do it in production. Global.asax var formatters = GlobalConfiguration.Configuration.Formatters; formatters.Remove(formatters.XmlFormatter); Now we can start change…

Creating a URL shortener using ASP.NET WepAPI and MVC: error handling

Enrico

In the two previous post I discussed about the first step to creare this application and the implementation of the business logic. Now we can implement the error handling. We have two custom exception classes: ShorturlConflictException (when a segment already exists) and ShorturlNotFoundException (when a segment isn’t found in the database). There is also a third type: an unexpected exception, for example when there is no database connection. Normally, the user will see these errors. We have to build a mechanism where these exceptions are caught and a nice error…

Creating a URL shortener using ASP.NET WepAPI and MVC

Enrico

In this tutorial, I use several techniques and tools. I use Microsoft Visual Studio 2015 and the latest version of all components. ASP.NET MVC: Microsoft’s modern web application framework. As the name says, it pushes you to use the MVC (model view controller) software design principle. ASP.NET Web API: Web API and MVC are used together in many applications. With MVC, the HTML of the web pages are rendered on the server, and with Web API you can, like the name says, create an API. Web API also uses the…

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to… web.config issue

Enrico

I have a problem like this on server [A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from ‘System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ in the context ‘Default’ at location ‘C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll’. Type B originates from ‘System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ in the context ‘Default’ at location ‘C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_1.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll’. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: [A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from ‘System.Web.WebPages.Razor, Version=2.0.0.0,…