将Razor视图页面呈现为WebApi核心中的字符串

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Razor;
using System.IO;
using System.Threading.Tasks;

public class RazorViewToStringRenderer
{
    private readonly IRazorViewEngine _razorViewEngine;

    public RazorViewToStringRenderer(IRazorViewEngine razorViewEngine)
    {
        _razorViewEngine = razorViewEngine;
    }

    public async Task<string> RenderViewToStringAsync<TModel>(string viewName, TModel model)
    {
        var actionContext = new ActionContext();
        var viewResult = _razorViewEngine.FindView(actionContext, viewName, false);

        if (viewResult.View == null)
        {
            throw new ArgumentNullException($"{viewName} does not match any available view");
        }

        using (var sw = new StringWriter())
        {
            var viewDictionary = new ViewDataDictionary<TModel>(new EmptyModelMetadataProvider(), new ModelStateDictionary())
            {
                Model = model
            };

            var viewContext = new ViewContext(
                actionContext,
                viewResult.View,
                viewDictionary,
                new TempDataDictionary(actionContext.HttpContext, _tempDataProvider),
                sw,
                new HtmlHelperOptions()
            );

            await viewResult.View.RenderAsync(viewContext);
            return sw.ToString();
        }
    }
}

public class MyController : ControllerBase
{
    private readonly RazorViewToStringRenderer _viewToStringRenderer;

    public MyController(RazorViewToStringRenderer viewToStringRenderer)
    {
        _viewToStringRenderer = viewToStringRenderer;
    }

    public async Task<IActionResult> GetViewAsString()
    {
        var model = new MyModel(); // 替换为实际的模型对象
        var viewName = "MyView"; // 替换为实际的视图名称

        var viewString = await _viewToStringRenderer.RenderViewToStringAsync(viewName, model);

        return Ok(viewString);
    }
}