Program.cs

varbuilder=WebApplication.CreateBuilder();
builder.Services.AddControllersWithViews();
builder.Services.AddRazorPages();

varapp=builder.Build();
app.UseMiddleware<GreeterMiddleware>();
app.MapRazorPages();

app.Run();

publicclassGreeterMiddleware
{
RequestDelegate_next;

readonlyLinkGenerator_linkGenerator;

publicGreeterMiddleware(RequestDelegatenext,LinkGeneratorlinkGenerator)
{
_next=next;
_linkGenerator=linkGenerator;
}

publicasyncTaskInvokeAsync(HttpContexthttpContext)
{
EndpointendPoint=httpContext.GetEndpoint();

varmessage=endPoint.Metadata.GetMetadata<MessageAttribute>();

if(message!=null)
{
if(httpContext.Request.Method==HttpMethods.Get)
httpContext.Items.Add("GreetingFromMiddleWare",message.ContentGet);
elseif(httpContext.Request.Method==HttpMethods.Post)
httpContext.Items.Add("GreetingFromMiddleWare",message.ContentPost);
}

await_next.Invoke(httpContext);
}
}

[AttributeUsage(AttributeTargets.Class|AttributeTargets.Method)]
publicclassMessageAttribute:System.Attribute
{
publicstringContentGet{get;set;}

publicstringContentPost{get;set;}
}