C# 在Aspnet Core中添加HTML块发送电子邮件的良好实践

在aspnet core中，我使用简单的HTML创建了一个局部视图：

<div style="background-color:#000;color:#fff;font-size:small">
E-mail enviado pela Quality Administrabem

电子邮件enviado pela质量管理员

在_emailSender.SendEmailAsync方法中，我希望插入部分视图中的内容以完成电子邮件。我认为最好的方法是创建一个局部视图并在那里调用它，但结果如下

和电子邮件收件箱邮件，这是结果：

我也考虑过使用StringBuilder，但这将是返工。那么，实现此块的最佳方法是什么呢？

看起来类

PartialViewResult

没有覆盖

ToString（）

。一种方便的扩展方法可以是：

公共静态字符串ConvertToString（此partialView结果为partialView，
控制器上下文（控制器上下文）
{
使用（var sw=new StringWriter（））
{
partialView.View=ViewEngines.Engines
.FindPartialView（controllerContext，partialView.ViewName）.View；
var vc=新视图上下文(
controllerContext、partialView.View、partialView.ViewData、partialView.TempData、sw）；
partialView.View.Render（vc，sw）；
var partialViewString=sw.GetStringBuilder（）.ToString（）；
返回部分密封圈；
}
}

取自

---

通过这种方式，您应该能够像添加部分（“\u RodapeEmailPadrao”）。ConvertToString（ControllerContext）

看起来您使用的是asp.net核心

标识

，它是由2.2中的Razor页面搭建的。请参阅下面的演示，它同时传递了一个模型

1.创建

IRazorPartialToStringRenderer

接口和

RazorPartialToStringRenderer

类

public interface IRazorPartialToStringRenderer
{
    Task<string> RenderPartialToStringAsync<TModel>(string partialName, TModel model);
}
//class
using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;
namespace YourNamespace
{
public class RazorPartialToStringRenderer : IRazorPartialToStringRenderer
{
    private IRazorViewEngine _viewEngine;
    private ITempDataProvider _tempDataProvider;
    private IServiceProvider _serviceProvider;
    public RazorPartialToStringRenderer(
        IRazorViewEngine viewEngine,
        ITempDataProvider tempDataProvider,
        IServiceProvider serviceProvider)
    {
        _viewEngine = viewEngine;
        _tempDataProvider = tempDataProvider;
        _serviceProvider = serviceProvider;
    }
    public async Task<string> RenderPartialToStringAsync<TModel>(string partialName, TModel model)
    {
        var actionContext = GetActionContext();
        var partial = FindView(actionContext, partialName);
        using (var output = new StringWriter())
        {
            var viewContext = new ViewContext(
                actionContext,
                partial,
                new ViewDataDictionary<TModel>(
                    metadataProvider: new EmptyModelMetadataProvider(),
                    modelState: new ModelStateDictionary())
                {
                    Model = model
                },
                new TempDataDictionary(
                    actionContext.HttpContext,
                    _tempDataProvider),
                output,
                new HtmlHelperOptions()
            );
            await partial.RenderAsync(viewContext);
            return output.ToString();
        }
    }
    private IView FindView(ActionContext actionContext, string partialName)
    {
        var getPartialResult = _viewEngine.GetView(null, partialName, false);
        if (getPartialResult.Success)
        {
            return getPartialResult.View;
        }
        var findPartialResult = _viewEngine.FindView(actionContext, partialName, false);
        if (findPartialResult.Success)
        {
            return findPartialResult.View;
        }
        var searchedLocations = getPartialResult.SearchedLocations.Concat(findPartialResult.SearchedLocations);
        var errorMessage = string.Join(
            Environment.NewLine,
            new[] { $"Unable to find partial '{partialName}'. The following locations were searched:" }.Concat(searchedLocations)); ;
        throw new InvalidOperationException(errorMessage);
    }
    private ActionContext GetActionContext()
    {
        var httpContext = new DefaultHttpContext
        {
            RequestServices = _serviceProvider
        };
        return new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
    }
}
}

4.获取字符串的部分视图

var body = await _renderer.RenderPartialToStringAsync("_RodapeEmailPadrao",YourModel);

指

    //omit other DI
    private readonly IRazorPartialToStringRenderer _renderer;
    public ForgotPasswordModel(IRazorPartialToStringRenderer renderer)
    {
        _renderer = renderer;
    }

var body = await _renderer.RenderPartialToStringAsync("_RodapeEmailPadrao",YourModel);