How to add a Class Diagram to an ASP.NET Core project in VS 2017?

.net visual-studio asp.net-core visual-studio-2017 class-diagram
Serge picture Serge · Oct 11, 2018 · Viewed 7.6k times · Source

I followed the How to: Add class diagrams to projects, but I have no "Class Diagram" template in my ASP.NET Core project after installing the ClassDiagram Visual Studio Component (I restarted Visual Studio after the installation of the component):

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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
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ASP.NET and Web Tools 2017   15.8.05085.0
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ASP.NET Core Razor Language Services   15.8.31590
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ASP.NET Web Frameworks and Tools 2012   4.0.30625.0
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ASP.NET Web Frameworks and Tools 2017   5.2.60618.0
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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
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C# Tools   2.9.0-beta8-63208-01
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Common Azure Tools   1.10
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Devart Code Compare   4.2.236
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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
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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
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Visual Basic Tools   2.9.0-beta8-63208-01
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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
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Visual Studio Tools for Containers   1.0
Visual Studio Tools for Containers

Answer

Shimmy Weitzhandler picture Shimmy Weitzhandler · Dec 16, 2018

Well as answered here, this is a known issue (VOTE for MS to fix it!)

As a workaround, From the New File dialog box create a plain XML named Diagram.cd (replace Diagram with your choice), right click the file and select Open With..., and select XML (Text) Editor, then replace its contents with the following:

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

Then close the file saving it. When you reopen it normally it should work now.

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