I'm working on an ASP.NET application in Visual Studio 2019 using NET 5.0 and attempting to display database entries using a webgrid that i have named 'grid' but am unable to use 'grid.GetHtml'. Whenever I use it I receive the following error: Reference to type 'IHtmlString' claims it is defined in 'System.Web', but it could not be found.

I have tried reinstalling all my NuGet packages and rebuilding my solution multiple times but no luck.

I feel like there may be some inconsistencies between my target framework and my packages but I'm not sure how to fix this. I had to create a web.config file to establish my connection string to the DB but other than that my project is pretty bare bones and straight forward so far.

[Code with 'GetHtml' error] [1]: https://i.stack.imgur.com/BvfJ7.png

[List of NuGet Packages] [2]: https://i.stack.imgur.com/nkqf8.png

CodePudding user response：

Add the following to your file

using System.Web;

Check here also: The type 'System.Web.IHtmlString' is defined in an assembly that is not referenced

CodePudding user response：

I found the solution for my particular issue. When creating the project in Visual Studio 2019 I selected the template 'ASP.NET Web App (Model View Controller)'. Apparently this template is not compatible with .NET 4.x, which is what some of the packages I was using required. In fact, I couldn't even find a way to switch the targeted framework to something besides 5.0 or 3.1.

So I created a new project from scratch using the template 'ASP.NET Web Application (.NET Framework)' which allowed me to select frameworks from a larger list, including the .NET 4.x frameworks (I used 4.8, this included additional files by default like the web.config file) which was necessary for my project.