C# Response.Write Error from scaffolded "dotnet new mvc"

C# Response.Write Error from scaffolded "dotnet new mvc"

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I'm familiar with PHP and JS, as well as MVC methodology, but I'm completely new to C# and have spent time looking for the documentation on this specific error.

I used dotnet new mvc to create a working app on port 5000. Also note, I am working in the Controller, not the model or view:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using ExelonPrime.Models;

namespace OptimusPrime.Controllers{
    public class ApiController : Controller
    {
        public void Help_Pdf()
        {
            Response.Write("test");
        }
    }
}

And the error I get (when trying to compile) is:

error CS1061: 'HttpResponse' does not contain a definition for 'Write' and no accessible extension method 'Write' accepting a first argument of type 'HttpResponse' could be found (are you missing a using directive or an assembly reference?)

If I'm missing a using directive, which one is it? I tried System.Web and that didn't work. How do I make this work?


In ASPNET Core, when writing an API, it's more common to return an object, or POCO in stead of directly writing to the response stream (although it indeed is possible)

try changing your

public void Help_Pdf()
{
    Response.Write("test");
}

to

[HttpGet()]
public IActionResult Help_Pdf()
{
    return Ok();
}

this will return an 204 (no content), you can pass data however, to the OK function, to add a body to the response object.

Error when running CRUD scaffolding for dotnet core asp.net, I believe this is a bug in the current ASP.NET Core. I don't know if it will get my problem is solved here for controllers with read/write actions. One thing that I really like about ASP.NET so far is that Visual Studio is able to generate code for me which I would have to write repeatedly by myself. A feature called Scaffolding creates a Controller and several Views on basis of a model.


I would recommend following through microsofts tutorial on using asp.net core.

https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/?view=aspnetcore-2.2

As far as this specific instance, rather than using Response.Write, I would do this

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using SampleWeb.Models;

namespace SampleWeb.Controllers
{
    public class ApiController : Controller
    {
        [HttpGet]
        public ActionResult<string> Help_Pdf()
        {
            return "test";
        }
    }
}

This specific sample might be helpful.

With this class, the url https://localhost:5001/api/Help_Pdf returns "test"

How To Fix Common Errors Using ASP.NET MVC Scaffolding , One thing that I really like about ASP.NET so far is that Visual Studio is able this post where I write about common problems that occur while scaffolding. Error: There was an error running the selected code generator: Try  Response.Write("Please Login: <br>") Response.WriteFile("login.txt") Remarks When this method is used with large files, calling the method might throw an exception.


If your trying to write directly to the response stream like that, you can do this:

public async Task Help_Pdf()
{
    await Response.WriteAsync("Test");
}

However, I'd recommend not doing this in your actual app, the method should return an IActionResult. IMO it's not good practice to write directly to the stream in your controller methods (not very test friendly).

Part 3, scaffolded Razor Pages in ASP.NET Core, This tutorial examines the Razor Pages created by scaffolding in the An example of a model error is posting a value for the date field that  Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great


HttpResponse.Write Method (System.Web), Writes a character to an HTTP response output stream. public: void Write(char ch​);. C# Copy. In this chapter, you learned what Scaffolded item is in the ASP.NET MVC 5 and how to use it in the program. Scaffolded makes developer job easier and creates controllers and views automatically based on models and database tables. In the next chapter, you will learn Model Binding in ASP.NET MVC 5.


Part 4, add a model to an ASP.NET Core MVC app, Part 4 of tutorial series on ASP.NET Core MVC. In this tutorial, you write the model classes first, and EF Core creates the database. Additional packages are installed automatically in the scaffolding step later in the tutorial. you get a Cannot open database or no such table: Movie error message. Reverse engineering is the process of scaffolding entity type classes and a DbContext class based on a database schema. It can be performed using the Scaffold-DbContext command of the EF Core Package Manager Console (PMC) tools or the dotnet ef dbcontext scaffold command of the .NET Command-line Interface (CLI) tools.


Can't get past Scaffolding a controller · Issue #7014 · dotnet , I get the following error: "Scaffolding failed. ASP.NET Core Razor Language Services 15.7.31476. Provides Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host. Scaffolding involves creating base templates for code or markup of project items through an automated method. In this article Bipin Joshi explains the basics of using the MvcScaffolding package to generate a CRUD interface for a database table.