C# – How pass objects from one page to another on ASP.Net Core with razor pages

asp.net-corecrazor

I'm developing a web application using Asp.net core 2.0 with razor pages. I'm creating an object with some data and want to send that object to another page.

Actually I'm doing this:

var customObject = new{
   //some values
};
return RedirectToPage("NewPage", customObject);

I see that the url has the values of the object I'm sending, but I can't find how to take that values (in the NewPage instance).

Can anybody knows how to share objects between razor pages? Is this the correct way to achieve it? or Is there another better way?

Thanks in advance

Best Answer

You can pass parameters to specified handlers in the page model class, like this:

return RedirectToPage("Orders", "SingleOrder", new {orderId = order.Id});

Where the page model class method has this signature:

public void OnGetSingleOrder(int orderId)

If you are passing an object, you can pass the object directly, but in my experience any child objects are not populated.

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C# – How to update the GUI from another thread

The simplest way is an anonymous method passed into Label.Invoke:

// Running on the worker thread
string newText = "abc";
form.Label.Invoke((MethodInvoker)delegate {
    // Running on the UI thread
    form.Label.Text = newText;
});
// Back on the worker thread

Notice that Invoke blocks execution until it completes--this is synchronous code. The question doesn't ask about asynchronous code, but there is lots of content on Stack Overflow about writing asynchronous code when you want to learn about it.

C# – How to get the client’s IP address in ASP.NET MVC

The simple answer is to use the HttpRequest.UserHostAddress property.

Example: From within a Controller:

using System;
using System.Web.Mvc;

namespace Mvc.Controllers
{
    public class HomeController : ClientController
    {
        public ActionResult Index()
        {
            string ip = Request.UserHostAddress;

            ...
        }
    }
}

Example: From within a helper class:

using System.Web;

namespace Mvc.Helpers
{
    public static class HelperClass
    {
        public static string GetIPHelper()
        {
            string ip = HttpContext.Current.Request.UserHostAddress;
            ..
        }
    }
}

BUT, if the request has been passed on by one, or more, proxy servers then the IP address returned by HttpRequest.UserHostAddress property will be the IP address of the last proxy server that relayed the request.

Proxy servers MAY use the de facto standard of placing the client's IP address in the X-Forwarded-For HTTP header. Aside from there is no guarantee that a request has a X-Forwarded-For header, there is also no guarantee that the X-Forwarded-For hasn't been SPOOFED.

Original Answer

Request.UserHostAddress

The above code provides the Client's IP address without resorting to looking up a collection. The Request property is available within Controllers (or Views). Therefore instead of passing a Page class to your function you can pass a Request object to get the same result:

public static string getIPAddress(HttpRequestBase request)
{
    string szRemoteAddr = request.UserHostAddress;
    string szXForwardedFor = request.ServerVariables["X_FORWARDED_FOR"];
    string szIP = "";

    if (szXForwardedFor == null)
    {
        szIP = szRemoteAddr;
    }
    else
    {
        szIP = szXForwardedFor;
        if (szIP.IndexOf(",") > 0)
        {
            string [] arIPs = szIP.Split(',');

            foreach (string item in arIPs)
            {
                if (!isPrivateIP(item))
                {
                    return item;
                }
            }
        }
    }
    return szIP;
}

Best Answer

Related Solutions

C# – How to update the GUI from another thread

C# – How to get the client’s IP address in ASP.NET MVC

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