How to render Razor Page with a model in .Net Core app and send it with HttpClient

Question

I'm working on Service which is generating dynamic Razor page connected with model, and the page needs to be sent to another service through HttpClient . This is the ActionResult which is generating the view:

// GET: /Details/
public async Task<IActionResult> DetailsSend(int id)
{
    if (id == null)
    {
        return NotFound();
    }
    
    var details = await _context.Details
        .FirstOrDefaultAsync(d=> d.Id == id);

    return View(details);
}

But i don't want to return this View(details). I want to send this dynamic view via httpclient. Any suggestion?

Presumably you want to render the razor view to a string. There are lots of articles and posts about that (e.g. https://stackoverflow.com/q/483091/120955). Then you can send the result via HttpClient. — StriplingWarrior, Jun 08 '21 at 17:44

score 1 · Accepted Answer · answered Jun 09 '21 at 07:53

You could render the view as string like below:

public class EmployeesController : Controller
{
    private readonly YourDbContext _context;
    private readonly Microsoft.AspNetCore.Mvc.ViewEngines.ICompositeViewEngine _viewEngine;

    public EmployeesController(ICompositeViewEngine viewEngine, YourDbContext context)
    {
        _viewEngine = viewEngine;
        _context = context;
    }
    public async Task<string> DetailsSend(int id)
    {
        var details = await _context.Details
            .FirstOrDefaultAsync(d => d.Id == id);
        string view = "";
        ViewData.Model = details;
        using (var writer = new StringWriter())
        {
            ViewEngineResult viewResult = _viewEngine.FindView(ControllerContext, "Details", false);
            ViewContext viewContext = new ViewContext(
                                                        ControllerContext,
                                                        viewResult.View,
                                                        ViewData,
                                                        TempData,
                                                        writer,
                                                        new HtmlHelperOptions()
                                                        );

            await viewResult.View.RenderAsync(viewContext);
            view = writer.GetStringBuilder().ToString();
        }

        return view;
    }
}

Then you could use HttpClient to call this api and get the result like below:

public async Task<IActionResult> Index()
{
    var url = "https://localhost:portNumber/ControllerName/detailssend/1";//it should be the url of your api
    var httpClient = new HttpClient();
    var response = await httpClient.GetAsync(url);
    using (var content = response.Content)
    {
        //get the json result from your api
        var result = await content.ReadAsStringAsync();
    }
}

can you describe how you create IHttpActionResult for the url ``` "https://localhost:portNumber/ControllerName/detailssend/1" ``` or something or you direct send from async Task? — Rajzer, Jun 10 '21 at 07:29
Hi @Rajzer, not sure what do you mean.Maybe could you please explain more for me? It is just the common way about how to use httpclient to call api. — Rena, Jun 10 '21 at 07:35
And I think what is the importance should be how to generate view to dynamic string in your scenario. — Rena, Jun 10 '21 at 07:37

score -3 · Answer 2 · edited Jun 08 '21 at 17:08

-3

You should write as follows:

 var details = (await context (d => d.Id == id)).Details.FirstOrDefaultAsync();

edited Jun 08 '21 at 17:08

Grigory Zhadko

1,484
1
19
33

answered Jun 08 '21 at 07:13

Saeed

1
1

1

This is incorrect code (it won't compile), and it doesn't answer the question. – StriplingWarrior Jun 08 '21 at 17:42

How to render Razor Page with a model in .Net Core app and send it with HttpClient

2 Answers2