mobile redirect, and return to desktop site : The Official Microsoft ASP.NET Forums

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mobile redirect, and return to desktop site

Jul 06, 2012 12:15 AM|LINK

Hey guys having a little problem I got this code:

string strUserAgent = Request.UserAgent.ToString().ToLower();

if (strUserAgent != null){
 
 if (Request.Browser.IsMobileDevice == true ||

 strUserAgent.Contains("iphone") ||
 strUserAgent.Contains("blackberry") ||
 strUserAgent.Contains("mobile") ||
 strUserAgent.Contains("android") ||
 strUserAgent.Contains("windows ce") ||
 strUserAgent.Contains("opera mini") ||
 strUserAgent.Contains("palm"))
 {
  
  Response.Redirect("http://m.thecodingguys.net");

 }

}

OK now this works perfectly and the user get redirected but say they want to go to the desktop site then what? Because this code will just to a redirect again.. how can I prevent this?

THANKS - CE
My Site | My Blog

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Re: mobile redirect, and return to desktop site

Jul 06, 2012 01:45 AM|LINK

I guess you could use a Query string to do this. Change the if statement so if there is a query string like IgnoreMobile=="true" it will not redirect

Developer at Sea World
Space Coast .Net User Group

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Re: mobile redirect, and return to desktop site

Jul 07, 2012 09:49 PM|LINK

I can't figure it out. My main site uses RazorC (CMS) the mobil was just hand coded using asp.net and master/and nested pages. At the bottom of mobile site is "return to desktop" site.

The thing is out is it going to pass on the information? That peice of code above is in the .cshtml layout page and it redirects the person to mobile site if it detects it.

THANKS - CE
My Site | My Blog

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Re: mobile redirect, and return to desktop site

Jul 07, 2012 11:09 PM|LINK

OK I have done this so far maybe someone get help. When the user clicks on Desktop Site a tracking cookie is added in their browser. Here is the code:

Response.Cookies["MobileDevice"].Value = "IgnoreMobileDevice";
            Response.Cookies["MobileDevice"].Expires = DateTime.Now.AddDays(30);

Now here is the code for the main site domain thecodngguys..

@{
 
string strUserAgent = Request.UserAgent.ToString().ToLower();

bool MobileDevice = Request.Browser.IsMobileDevice;

if (strUserAgent != null){
 
 if (MobileDevice == true ||

 strUserAgent.Contains("iphone") ||
 strUserAgent.Contains("blackberry") ||
 strUserAgent.Contains("mobile") ||
 strUserAgent.Contains("android") ||
 strUserAgent.Contains("windows ce") ||
 strUserAgent.Contains("opera mini") ||
 strUserAgent.Contains("palm"))
 {
   
    Response.Redirect("http://localhost:52097",false);
  
 } else {

  if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice"){
   
   MobileDevice = false;
  }
 


}
}

}

Now I got an error because if the cookie is not in their browser then you get

Object reference not set to an instance of an object.

And it points to line:

if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice")

Can someone clear this up?

THANKS - CE
My Site | My Blog

Edited by CriticalError on Jul 07, 2012 11:10 PM

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Mikesdotnett...

All-Star

154951 Points

19870 Posts

Moderator

MVP

Re: mobile redirect, and return to desktop site

Jul 08, 2012 06:49 AM|LINK

You should always check to see if a cookie is null or not before attempting to read values from it:

} else {
  if(Request.Cookies["MobileDevice"] != null){
    if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice"){
      MobileDevice = false;
    }
  }
}

Regards, Mike
Beginning ASP.NET Web Pages with WebMatrix | My Site | Twitter

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Re: mobile redirect, and return to desktop site

Jul 08, 2012 11:41 AM|LINK

Thanks for that Mike but there is another problem now, I just checked on my Android device and when I click "Desktop SIte" it just redirects back to the mobile site, it's not supposed to since the tracking cookie is saved and MobileDevice = false. What am I doing wrong?

THANKS - CE
My Site | My Blog

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Mikesdotnett...

All-Star

154951 Points

19870 Posts

Moderator

MVP

Re: mobile redirect, and return to desktop site

Jul 08, 2012 04:40 PM|LINK

You need to check the value of the cookie before redirecting if the device is a mobile device, since the cookie value overrides the mobile device check:

@{
  string strUserAgent = Request.UserAgent.ToString().ToLower();
  bool MobileDevice = Request.Browser.IsMobileDevice;
  if(Request.Cookies["MobileDevice"] != null){
    if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice"){
      MobileDevice = false;
    }
  }
  if (strUserAgent != null){
    if (MobileDevice == true ||
      strUserAgent.Contains("iphone") ||
      strUserAgent.Contains("blackberry") ||
      strUserAgent.Contains("mobile") ||
      strUserAgent.Contains("android") ||
      strUserAgent.Contains("windows ce") ||
      strUserAgent.Contains("opera mini") ||
      strUserAgent.Contains("palm")){
        Response.Redirect("http://localhost:52097",false);
      }
   }
}

Regards, Mike
Beginning ASP.NET Web Pages with WebMatrix | My Site | Twitter

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CriticalErro...

Member

423 Points

394 Posts

Re: mobile redirect, and return to desktop site

Jul 08, 2012 06:09 PM|LINK

I tried this on Android and my dekstop PC (got a plugin to cahnge user agent) and it redirects to mobile site, but then when user goes to desktop site it still redirects back, I checked cookies and it did have the cookie Mobile Device with the above value.

The first part is this:

bool MobileDevice = Request.Browser.IsMobileDevice;
  if(Request.Cookies["MobileDevice"] != null){
    if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice"){
      MobileDevice = false;
    }
  }

So basically if there is a tracking cookie named Mobile Device and value IgnoreMobileDevice then MobileDevice should be false. However for some reason it still evaulates to true and redirects.

  if (strUserAgent != null){
    if (MobileDevice == true ||
      strUserAgent.Contains("iphone") ||
      strUserAgent.Contains("blackberry") ||
      strUserAgent.Contains("mobile") ||
      strUserAgent.Contains("android") ||
      strUserAgent.Contains("windows ce") ||
      strUserAgent.Contains("opera mini") ||
      strUserAgent.Contains("palm")){
        Response.Redirect("http://m.thecodingguys.net",false);
      }
   }
}

Now with the second part it says if (MobileDevice == true). The thing is if the tracking cookie is in the browser, then MobileDevice is not equal to true it's false so it should not redirect, but it always does.

THANKS - CE
My Site | My Blog

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TOMCIO

Contributor

3636 Points

832 Posts

Re: mobile redirect, and return to desktop site

Jul 08, 2012 07:50 PM|LINK

You have incorrect code that is why. Even if the MobileDevice is set to false you still check if strUserAgent contains "android" etc. so yes users will be redirected to mobile site because your code will detect "android"

Take a good look at your IF statement, what you do is:

if mobile device OR if contains "android" OR if contains ....

Anyway (i did not tetst it) but i think this is work for you:

string strUserAgent = Request.UserAgent.ToString().ToLower();
    bool MobileDevice = Request.Browser.IsMobileDevice;
    
    if (strUserAgent != null){
    if (strUserAgent.Contains("iphone") ||
      strUserAgent.Contains("blackberry") ||
      strUserAgent.Contains("mobile") ||
      strUserAgent.Contains("android") ||
      strUserAgent.Contains("windows ce") ||
      strUserAgent.Contains("opera mini") ||
      strUserAgent.Contains("palm")){
        MobileDevice=true;
      }
   }
    
  if(Request.Cookies["MobileDevice"] != null){
    if (Request.Cookies["MobileDevice"].Value == "IgnoreMobileDevice"){
      MobileDevice = false;
    }
  }

    if (MobileDevice == true ){
        Response.Redirect("http://m.thecodingguys.net",false);
      }

Tom | New Media Group, Inc.
Web: Chicago Website Design
r@zorC - Open Source ASP.net CMS for WebMatrix

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CriticalErro...

Member

423 Points

394 Posts

Re: mobile redirect, and return to desktop site

Jul 08, 2012 10:52 PM|LINK

Still makes the redirect is there anyway to tell the if statement to stop and no longer run?

Basically if the cookie has been detected no longer run the bottom if statement..

THANKS - CE
My Site | My Blog

Edited by CriticalError on Jul 08, 2012 11:26 PM

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