asp.net 检测访问者是iphone,android,web（摘录）

aps.net
可以使用WebFormViewEngine来实现。
参考文章：http://www.hanselman.com/blog/MixMobileWebSitesWithASPNETMVCAndTheMobileBrowserDefinitionFile.aspx
源代码

public class MobileCapableWebFormViewEngine : WebFormViewEngine
{
    public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache)
    {
        ViewEngineResult result = null;
        var request = controllerContext.HttpContext.Request;

        //This could be replaced with a switch statement as other advanced / device specific views are created
        if (UserAgentIs(controllerContext, "iPhone"))
        {
            result = base.FindView(controllerContext, "Mobile/iPhone/" + viewName, masterName, useCache);
        }

        // Avoid unnecessary checks if this device isn't suspected to be a mobile device
        if (request.Browser.IsMobileDevice)
        {
            if (UserAgentIs(controllerContext, "MSIEMobile 6"))
            {
                result = base.FindView(controllerContext, "Mobile/MobileIE6/" + viewName, masterName, useCache);
            }
            else if (UserAgentIs(controllerContext, "PocketIE") && request.Browser.MajorVersion >= 4)
            {
                result = base.FindView(controllerContext, "Mobile/PocketIE/" + viewName, masterName, useCache);
            }

            //Fall back to default mobile view if no other mobile view has already been set
            if ((result == null || result.View == null) &&
                            request.Browser.IsMobileDevice)
            {
                result = base.FindView(controllerContext, "Mobile/" + viewName, masterName, useCache);
            }
        }

        //Fall back to desktop view if no other view has been selected
        if (result == null || result.View == null)
        {
            result = base.FindView(controllerContext, viewName, masterName, useCache);
        }

        return result;
    }

    private bool UserAgentIs(ControllerContext controllerContext, string userAgentToTest)
    {
        return (controllerContext.HttpContext.Request.UserAgent.IndexOf(userAgentToTest, StringComparison.OrdinalIgnoreCase) > 0);
    }
}

public class MobileCapableWebFormViewEngine : WebFormViewEngine
{
    public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache)
    {
        ViewEngineResult result = null;
        var request = controllerContext.HttpContext.Request;
 
        //This could be replaced with a switch statement as other advanced / device specific views are created
        if (UserAgentIs(controllerContext, "iPhone"))    
        {
            result = base.FindView(controllerContext, "Mobile/iPhone/" + viewName, masterName, useCache);
        }
 
        // Avoid unnecessary checks if this device isn't suspected to be a mobile device
        if (request.Browser.IsMobileDevice)
        {
            if (UserAgentIs(controllerContext, "MSIEMobile 6"))
            {
                result = base.FindView(controllerContext, "Mobile/MobileIE6/" + viewName, masterName, useCache);
            }
            else if (UserAgentIs(controllerContext, "PocketIE") && request.Browser.MajorVersion >= 4)
            {
                result = base.FindView(controllerContext, "Mobile/PocketIE/" + viewName, masterName, useCache);
            }
 
            //Fall back to default mobile view if no other mobile view has already been set
            if ((result == null || result.View == null) &&
                            request.Browser.IsMobileDevice)
            {
                result = base.FindView(controllerContext, "Mobile/" + viewName, masterName, useCache);
            }
        }
 
        //Fall back to desktop view if no other view has been selected
        if (result == null || result.View == null)
        {
            result = base.FindView(controllerContext, viewName, masterName, useCache);
        }
 
        return result;
    }
 
    private bool UserAgentIs(ControllerContext controllerContext, string userAgentToTest)
    {
        return (controllerContext.HttpContext.Request.UserAgent.IndexOf(userAgentToTest, StringComparison.OrdinalIgnoreCase) > 0);
    }
}

启用该引擎的使用方法：

protected void Application_Start()
       {
           AreaRegistration.RegisterAllAreas();

           RegisterRoutes(RouteTable.Routes);

           ViewEngines.Engines.Add(new MobileCapableWebFormViewEngine());

           ControllerBuilder.Current.SetControllerFactory(new NinjectControllerFactory());

           CronScheduler.Instance.startUp();


       }