XAML / Self binding, bindingcontext
Hello,
I want to bind the text property of a editor element to BindableProperty. Here is what I tried:
MyForm.xaml
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage x:Class="Com.Acme.MyForm"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:local="clr-namespace:Com.Acme;assembly=Com.Acme"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
>
<ContentPage.Content>
<Grid>
<Label Text="1" />
<Editor BindingContext="{local:MyForm}" Grid.Column="1" Text="{Binding Path=MyProperty}" />
</Grid>
</ContentPage.Content>
</ContentPage>
MyForm.cs
namespace Com.Acme {
public partial class MyForm : ContentPage {
public static readonly BindableProperty MyPropertyProperty = BindableProperty.Create(
"MyProperty",
typeof(Object),
typeof(MyForm),
null,
BindingMode.TwoWay,
null,
null,
null,
null,
null
);
public MyForm () {
InitializeComponent ();
}
public Object MyProperty {
get { return GetValue (MyPropertyProperty); }
set { SetValue(MyPropertyProperty, value); }
}
}
While the code above is running, I see around 60 block of this exception (all are different but similar) in Application Output panel and application exits in emulator:
[mono-rt] at <unknown> <0xffffffff>
[mono-rt] at (wrapper managed-to-native) System.Reflection.MonoCMethod.InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) <IL 0x0001c, 0xffffffff>
[mono-rt] at System.Reflection.MonoCMethod.InternalInvoke (object,object[]) [0x00002] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:535
[mono-rt] at System.Activator.CreateInstance (System.Type,bool) [0x000af] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System/Activator.cs:321
[mono-rt] at System.Activator.CreateInstance (System.Type) [0x00000] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System/Activator.cs:214
[mono-rt] at Xamarin.Forms.Xaml.CreateValuesVisitor.Visit (Xamarin.Forms.Xaml.ElementNode,Xamarin.Forms.Xaml.INode) <IL 0x00192, 0x00c57>
[mono-rt] at Xamarin.Forms.Xaml.ElementNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor,Xamarin.Forms.Xaml.INode) <IL 0x000b8, 0x006b7>
[mono-rt] at Xamarin.Forms.Xaml.ElementNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor,Xamarin.Forms.Xaml.INode) <IL 0x00058, 0x0038e>
[mono-rt] at Xamarin.Forms.Xaml.ElementNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor,Xamarin.Forms.Xaml.INode) <IL 0x0008f, 0x00576>
Where am I doing something wrong?
Well... I solved it. I'm writing the solution here.
First, I set the name of content page by x:Name directive and removed imported local namespace:
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage x:Class="Com.Acme.MyForm"
x:Name="xMyForm"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
>
...
then I changed BindingContext property as below:
...
<Editor BindingContext="{x:Reference Name=xMyForm}" Grid.Column="1" Text="{Binding Path=MyProperty}" />
...
now MyProperty value appears in the editor.
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