Getting Started

Step 1: Install EntityFrameworkCore.Diagrams

dotnet add package EntityFrameworkCore.Diagrams

Step 2: Add middleware

Use AddEfDiagrams() extension method in Configure() method of your Startup class to add middleware. Specify your DbContext type instead of ApplicationDbContext in the following example:

app.AddEfDiagrams<ApplicationDbContext>();

Here's how your Configure() method might look like after this step (notice highlighted line):

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
        app.UseBrowserLink();
        app.AddEfDiagrams<ApplicationDbContext>();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
    }

    app.UseStaticFiles();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

Notice that the middleware is added only in Development mode. This is important! Otherwise, any user in Production will se your model structure, which may not be desireable. This is not the case if you are developing public API, though.

Step 3: Start your app and see the diagram

Start your app and browse to /db-diagrams page. You should see the diagram now.