ASP.NET Core中怎么实现Url rewrite功能

public class ReplaceQueryStringMiddleware
{
    private readonly RequestDelegate next;

    public ReplaceQueryStringMiddleware(RequestDelegate next)
    {
        this.next = next;
    }

    public async Task Invoke(
        Microsoft.AspNetCore.Http.HttpContext context)
    {
        var request = context.Request;
        var queryString = request.QueryString.Value;

            
        if (!string.IsNullOrWhiteSpace(queryString))
        {
            //如果这里给context.Request.QueryString或context.Request.Path重新赋值，相当于就是Url rewrite了 
            request.QueryString = new QueryString("?demoKey=demoValue");//注意前面要加上问号，否者会报异常
                
        }

        await next.Invoke(context);
    }
}

public static class ReplaceQueryStringMiddlewareExtension
{
    public static void UseReplaceQueryString(this IApplicationBuilder app)
    {
        app.UseMiddleware<ReplaceQueryStringMiddleware>();
    }
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    //启用ReplaceQueryString中间件
    app.UseReplaceQueryString();

    //因为我们在app.UseMvc之前调用了app.UseReplaceQueryString将URL的QueryString替换了，所以下面使用app.UseMvc后，在MVC Controller中用Request.QueryString读到的将会是替换后的"?demoKey=demoValue"
    //同样如果在app.UseReplaceQueryString中更改了context.Request.Path的值，那么在下面app.UseMvc后，MVC读到的Request.Path也是更改后新的Url值，这会导致MVC根据新的Url来调用不同的Controller和Action，实现了Url rewrite的功能
    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });

}