RazorEngine 在运行时抛出 'the name model does not exist in the current context'

Question

我正在使用 RazorEngine 包生成 e-mail 模板。
这是该方法的代码：

public async Task<string> GetEmailTemplateAsString<T>(string viewName, T model)
{
    var templatePath = @$"{Directory.GetCurrentDirectory()}\Views\{viewName}.cshtml";
    var template = await File.ReadAllTextAsync(templatePath);

    var html = Engine.Razor.RunCompile(template, "weeklySummary", typeof(T), model);

    return html;
}

和视图：

@model CourseWork.Core.Models.EmailTemplate.WeeklySummaryModel

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background-color: lightgoldenrodyellow;
            font-family: Verdana, Geneva, Tahoma, sans-serif;
        }

        .greetings {
            text-align: center;
            border-bottom: 1px solid lightgray;
        }

        .main {
            display: block;
            border-bottom: 1px solid lightgray;
            text-align: center;
            padding-bottom: 21.28px;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        li {
            display: block;
            padding: 10px;
        }
    </style>
</head>
<body>
    <section class="greetings">
        <h1>Hello, @Model.User.DisplayName!</h1>
        <h3>Here is our weekly summary, specially for you</h3>
    </section>

    <section class="main">
        @foreach (var entry in Model.BoardThreadWithRepliesModels)
        {
            <h4>@entry.BoardName</h4>
            <h5>@entry.ThreadName</h5>
            <ul>
                @foreach (var reply in entry.Replies)
                {
                    <li>
                        <span>@reply.UserDisplayName</span>
                        <p>@reply.Content</p>
                        <img src="@reply.PicRelatedPath" alt="pic-related" />
                    </li>
                }
            </ul>
        }
    </section>
</body>
</html>

在我运行应用程序之后，我收到 CS0103 错误，问题的标题中有描述。

我尝试用谷歌搜索错误消息，但主要是所有结果都与 IntelliSense 不工作有关，这根本不是我的情况。

更新：调用代码：

*Dapper query*

var fullModel = new WeeklySummaryModel
{
    User = user,
    BoardThreadWithRepliesModels = models
};

return await _emailTemplateHelper.GetEmailTemplateAsString("WeeklySummary", fullModel);

UPD2：异常表明第 14 行第 18 行存在问题。它原来位于 auto-generated 代码中：

// <auto-generated/>
#pragma warning disable 1591
namespace CompiledRazorTemplates.Dynamic
{
    #line hidden
    using System.Threading.Tasks;
    using System;
    using System.Collections.Generic;
    using System.Linq;
    internal class RazorEngine_00fefb8ea0984fabaf601e182158fa32 : RazorEngine.Templating.TemplateBase<dynamic>
    {
        #pragma warning disable 1998
        public async override global::System.Threading.Tasks.Task ExecuteAsync()
        {
            Write(model);
            WriteLiteral(@" CourseWork.Core.Models.EmailTemplate.WeeklySummaryModel

<html lang=""en"">
<head>
    <meta charset=""UTF-8"">
    <meta http-equiv=""X-UA-Compatible"" content=""IE=edge"">
    <meta name=""viewport"" content=""width=device-width, initial-scale=1.0"">
    <title>Document</title>
    <style>
        body {
            background-color: lightgoldenrodyellow;
            font-family: Verdana, Geneva, Tahoma, sans-serif;
        }

        .greetings {
            text-align: center;
            border-bottom: 1px solid lightgray;
        }

        .main {
            display: block;
            border-bottom: 1px solid lightgray;
            text-align: center;
            padding-bottom: 21.28px;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        li {
            display: block;
            padding: 10px;
        }
    </style>
</head>
<body>
    <section class=""greetings"">
        <h1>Hello, ");
                          Write(Model.User.DisplayName);
            WriteLiteral("!</h1>\r\n        <h3>Here is our weekly summary, specially for you</h3>\r\n    </section>\r\n\r\n    <section class=\"main\">\r\n");
                     foreach (var entry in Model.BoardThreadWithRepliesModels)
        {
            WriteLiteral("            <h4>");
                       Write(entry.BoardName);
            WriteLiteral("</h4>\r\n            <h5>");
                       Write(entry.ThreadName);
            WriteLiteral("</h5>\r\n            <ul>\r\n");
                             foreach (var reply in entry.Replies)
                {
            WriteLiteral("                    <li>\r\n                        <span>");
                                     Write(reply.UserDisplayName);
            WriteLiteral("</span>\r\n                        <p>");
                                  Write(reply.Content);
            WriteLiteral("</p>\r\n                        <img");
            BeginWriteAttribute("src", " src=\"", 1563, "\"", 1590, 1);
            WriteAttributeValue("", 1569, reply.PicRelatedPath, 1569, 21, false);
            EndWriteAttribute();
            WriteLiteral(" alt=\"pic-related\" />\r\n                    </li>\r\n");
                            }
            WriteLiteral("            </ul>\r\n");
                    }
            WriteLiteral("    </section>\r\n</body>\r\n</html>");
        }
        #pragma warning restore 1998
    }
}
#pragma warning restore 1591

------------- END -----------

Answer 1

这个错误：

The name 'model' does not exist in the current context

通常在您尝试使用小写 m.

引用模板中的模型实例时发生

As explained here，模型的 type 是使用小写 @model 定义的，但是要引用模型的实例，您必须使用大写@Model 或 Model.

I cannot see nay incorrect reference to the view model in your script, but that doesn't mean it is not there.

尝试降级 nuget 包，版本 3 运行时完整异常应该包含更多信息，如下所示：

Errors while compiling a Template.
Please try the following to solve the situation:
  * If the problem is about missing/invalid references or multiple defines either try to load 
    the missing references manually (in the compiling appdomain!) or
    Specify your references manually by providing your own IReferenceResolver implementation.
    See https://antaris.github.io/RazorEngine/ReferenceResolver.html for details.
    Currently all references have to be available as files!
  * If you get 'class' does not contain a definition for 'member': 
        try another modelType (for example 'null' to make the model dynamic).
        NOTE: You CANNOT use typeof(dynamic) to make the model dynamic!
    Or try to use static instead of anonymous/dynamic types.
More details about the error:
 - error: (126, 58) The name 'model' does not exist in the current context
Temporary files of the compilation can be found in (please delete the folder):
...

它应该包含错误引用的行号和字符号以及编译模板的临时文件位置。

Answer 2

RazorEngine 是构建在 Microsoft 的 Razor 视图引擎之上的自定义库。它不具备您可能熟悉的 MVC 和 Razor 页面的所有功能。

只需删除 @model 指令。它应该可以工作，但如果没有，Visual Studio 无论如何在 IntelliSense 的意义上都没有多大帮助。

RazorEngine 在运行时抛出 'the name model does not exist in the current context'

RazorEngine throws 'the name model does not exist in the current context' at runtime

c#

asp.net-core-webapi

razorengine