如何在VS 2017中向ASP.NET核心项目添加类图？

Question

我遵循了How to: Add class diagrams to projects，但是在安装了ASP.NET Visual Studio组件之后，我的ClassDiagram核心项目中没有“类图”模板(在安装该组件后我重新启动了Visual Studio )：

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Microsoft Visual Studio Enterprise 2017 
Version 15.8.7
VisualStudio.15.Release/15.8.7+28010.2046
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Enterprise

Visual C++ 2017   00369-60000-00001-AA695
Microsoft Visual C++ 2017

ASP.NET and Web Tools 2017   15.8.05085.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services   15.8.31590
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2012   4.0.30625.0
For additional information, visit https://www.asp.net/

ASP.NET Web Frameworks and Tools 2017   5.2.60618.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   15.8.05023.0
Azure App Service Tools v3.0.0

Azure Functions and Web Jobs Tools   15.9.02009.0
Azure Functions and Web Jobs Tools

C# Tools   2.9.0-beta8-63208-01
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Devart Code Compare   4.2.236
Devart Code Compare
Copyright (c) 2012-2017 Devart. All rights reserved.
http://www.devart.com/codecompare/

JavaScript Language Service   2.0
JavaScript Language Service

Microsoft Azure Tools   2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.10730.2

Microsoft Continuous Delivery Tools for Visual Studio   0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager   1.0
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers   1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

NuGet Package Manager   4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

ProjectServicesPackage Extension   1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

ResourcePackage Extension   1.0
ResourcePackage Visual Studio Extension Detailed Info

ResourcePackage Extension   1.0
ResourcePackage Visual Studio Extension Detailed Info

Snapshot Debugging Extension   1.0
Snapshot Debugging Visual Studio Extension Detailed Info

SQL Server Data Tools   15.1.61808.07020
Microsoft SQL Server Data Tools

TypeScript Tools   15.8.20822.2001
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools   2.9.0-beta8-63208-01
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.2 for F# 4.5   15.8.0.0.  Commit Hash: 55a3dc3231c95c77f81ee53f7d29152029da7408.
Microsoft Visual F# Tools 10.2 for F# 4.5

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Containers   1.0
Visual Studio Tools for Containers

Answer 1

很好的回答了here，这是一个known issue (投票给MS来解决它！)

作为一种解决办法，可以从新建文件对话框中创建一个名为Diagram.cd的普通XML (将Diagram替换为您选择的内容)，右键单击该文件并选择打开方式...，选择XML (文本)编辑器，然后将其内容替换为以下内容：

<?xml version="1.0" encoding="utf-8" ?>
<ClassDiagram MajorVersion="1" MinorVersion="1">
  <Font Name="Segoe UI" Size="9" />
</ClassDiagram>

然后关闭文件并保存它。当您正常重新打开它时，它现在应该可以工作了。