Bug 42479 - Using the Margin property in XAML page throws the runtime exception
Summary: Using the Margin property in XAML page throws the runtime exception
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.0
Hardware: PC Mac OS
: Normal major
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-07-12 06:25 UTC by Prashant Cholachagudda
Modified: 2017-01-18 09:25 UTC (History)
6 users (show)

Tags: ac
Is this bug a regression?: ---
Last known good build:

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Description Prashant Cholachagudda 2016-07-12 06:25:28 UTC
Xamarin.Forms (version throws an `Xamarin.Forms.Xaml.XamlParseException` on app startup, when use the `Margin` property in the XAML. 

The exception occurs on both Android and iOS

# Example:

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
		xmlns:local="clr-namespace:XamlMargin" x:Class="XamlMargin.XamlMarginPage"

	<StackLayout VerticalOptions="Center" Margin="0,20,15,5" >
		<Entry Placeholder="USERNAME" HorizontalTextAlignment="Center" Margin="5"/>
		<Entry Placeholder="PASSWORD" IsPassword="true" HorizontalTextAlignment="Center" Margin="5"/>
		<Button Text="Login" Margin="20" />

# Exception from iOS:

Xamarin.Forms.Xaml.XamlParseException: Position 5:3. No Property of name Margin found
  at Xamarin.Forms.Xaml.ApplyPropertiesVisitor.SetPropertyValue (System.Object xamlelement, XmlName propertyName, System.Object value, System.Object rootElement, INode node, Xamarin.Forms.Xaml.HydratationContext context, IXmlLineInfo lineInfo) [0x004a9] in <filename unknown>:0
  at Xamarin.Forms.Xaml.ApplyPropertiesVisitor.Visit (Xamarin.Forms.Xaml.ValueNode node, INode parentNode) [0x000d8] in <filename unknown>:0
  at Xamarin.Forms.Xaml.ValueNode.Accept (IXamlNodeVisitor visitor, INode parentNode) [0x00000] in <filename unknown>:0
  at Xamarin.Forms.Xaml.RootNode.Accept (IXamlNodeVisitor visitor, INode parentNode) [0x00054] in <filename unknown>:0
  at Xamarin.Forms.Xaml.XamlLoader.Visit (Xamarin.Forms.Xaml.RootNode rootnode, Xamarin.Forms.Xaml.HydratationContext visitorContext) [0x00076] in <filename unknown>:0
  at Xamarin.Forms.Xaml.XamlLoader.Load (System.Object view, System.String xaml) [0x00052] in <filename unknown>:0
  at Xamarin.Forms.Xaml.XamlLoader.Load (System.Object view, System.Type callingType) [0x0002e] in <filename unknown>:0
  at Xamarin.Forms.Xaml.Extensions.LoadFromXaml[TXaml] (Xamarin.Forms.Xaml.TXaml view, System.Type callingType) [0x00000] in <filename unknown>:0
  at XamlMargin.XamlMarginPage.InitializeComponent () [0x0000c] in /Users/prashantvc/Projects/XamlMargin/XamlMargin/obj/Debug/XamlMargin.XamlMarginPage.xaml.g.cs:21
  at XamlMargin.XamlMarginPage..ctor () [0x00008] in /Users/prashantvc/Projects/XamlMargin/XamlMargin/XamlMarginPage.xaml.cs:9
  at XamlMargin.App..ctor () [0x0000e] in /Users/prashantvc/Projects/XamlMargin/XamlMargin/App.xaml.cs:11
  at XamlMargin.iOS.AppDelegate.FinishedLaunching (UIKit.UIApplication app, Foundation.NSDictionary options) [0x00007] in /Users/prashantvc/Projects/XamlMargin/iOS/AppDelegate.cs:17
  at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Users/builder/data/lanes/3412/3cf8aaed/source/maccore/src/UIKit/UIApplication.cs:79
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/3412/3cf8aaed/source/maccore/src/UIKit/UIApplication.cs:63
  at XamlMargin.iOS.Application.Main (System.String[] args) [0x00008] in /Users/prashantvc/Projects/XamlMargin/iOS/Main.cs:17
Comment 1 Stephane Delcroix 2017-01-18 09:25:18 UTC
There's no `Margin` property defined on `ContentPage`. throwing the exception is the expected behavior...