While reading C# 8.0 recently, I came across an article about writing wasm. Here is an example of how to build Blazor.

    command prompt :dotnet new blazorserver -o BlazorApp --no-https  and cd BlazorApp ,and dotnet run

 Counter.razor

@page "/counter"

Counter

Counter

Current count: @currentCount

Click me

@code {
    private int currentCount = 0;

    private void IncrementCount()
    {
        currentCount++;
    }
}

at index.rator:

@page "/"

Counter

Hello, world!

Welcome to your new app.

to change:

@page "/counter"

Counter

Counter

Current count: @currentCount

Click me

@code {
    private int currentCount = 0;

    [Parameter]
    public int IncrementAmount { get; set; } = 1;

    private void IncrementCount()
    {
        currentCount += IncrementAmount;
    }
}

@page "/"

Hello, world!

Welcome to your new app.

learn to :

使用 Blazor 生成 Web 应用 - Learn | Microsoft Docs