In a .NET MAUI Project, I have a View which contains an Entry with an EntryBehavior having a x:Name="myTextValidationBehavior" which I want to use in one of my ViewModels
<?xml version="1.0" encoding="utf-8" ?>
<ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
x:Class="MyApp.Pages.Views.MyFoodInputControlView"
x:Name="this">
<StackLayout BindingContext="{x:Reference this}">
<Grid Margin="20, 0, 20, 0">
...
<StackLayout Grid.Row="0" Grid.Column="0" VerticalOptions="Center">
<Label Text="{Binding NameLabelString}" />
<Label Text="{Binding IsOptionalLabelString}" FontSize="12" />
</StackLayout>
<StackLayout Grid.Row="0" Grid.Column="1" VerticalOptions="Center" >
<Entry Text="{Binding EntryInput}" Placeholder="{Binding PlaceholderString}" Keyboard="{Binding KeyboardSetting}" Margin="5, 0, 5, 15">
<Entry.Behaviors>
<toolkit:TextValidationBehavior
Flags="ValidateOnValueChanged"
x:Name="myTextValidationBehavior"
toolkit:MultiValidationBehavior.Error="Entry may not be empty">
</toolkit:TextValidationBehavior>
</Entry.Behaviors>
</Entry>
</StackLayout>
</Grid>
</StackLayout>
</ContentView>
This ContentView is used in a ContentPage:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewModels="clr-namespace:MyApp.ViewModels"
xmlns:controls="clr-namespace:MyApp.Pages.Views"
x:DataType="viewModels:ManageItemsViewModel"
x:Class="MyApp.Pages.ManageItem"
Title="My Title">
<VerticalStackLayout>
...
<StackLayout>
<controls:MyFoodInputControlView NameLabelString="MyLabel1:"
IsOptionalLabelString="Mandatory"
PlaceholderString="e.g. This Placeholder"
EntryInput="{Binding FoodNameString}" />
<controls:MyFoodInputControlView NameLabelString="MyLable2:"
IsOptionalLabelString="Optional"
PlaceholderString="z.B. This Placeholder"
EntryInput="{Binding BrandNameString}" />
...
<StackLayout Margin="20, 50, 15, 0">
<Grid RowSpacing="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Button Grid.Row="0" Grid.Column="0" Margin="5"
Text="OK"
Command="{Binding SaveItemCommand}" />
<Button Grid.Row="0" Grid.Column="1" Margin="5"
Text="Cancel"
Command="{Binding CancelItemCommand}" />
</Grid>
</StackLayout>
</StackLayout>
</VerticalStackLayout>
</ContentPage>
DataBinding of the "SaveItemCommand", "CancelItemCommand", "FoodNameString" and "BranchNameString" are performed correctly within the ManageItemsViewModel.
namespace MyApp.ViewModels
{
public partial class ManageItemsViewModel : ObservableObject
{
[ObservableProperty]
private string foodNameString;
[ObservableProperty]
private string brandNameString;
[RelayCommand]
async Task SaveItem()
{
try
{
if (!myTextValidationBehavior.IsValid)
{
...
}
...
}
catch (Exception e)
{
await App.Current.MainPage.DisplayAlert("Error", e.Message, "OK");
}
}
[RelayCommand]
async Task Canceltem()
{
...
}
}
}
In the SaveItemCommand-Handler, I want to access the TextValidationBehavior which was named myTextValidationBehavior in MyFoodInputControlView.
But, I can't reference myTextValidationBehavior within the ManageItemsViewModel. It just does not find it and says The name 'myTextValidationBehavior' does not exist in the current context
How can I reference myTextValidationBehavior?
Tried to reference it in the ViewModel as described above
