darinkes

    <!--Works-->
    <Image Source="resm:CrossTestAppAvalonia.Images.info2_blue.png" Width="32" Height="32" Margin="5"/>
    <!--Works-->
    <Image Source="resm:CrossTestAppAvalonia.Images.warning2_yellow.png" Width="32" Height="32" Margin="5"/>

    <!--Works-->
    <TextBox Name="textbox" Margin="5">
      <i:Interaction.Behaviors>
        <ia:DataTriggerBehavior Binding="{Binding MyProperty.Boolean}" ComparisonCondition="Equal" Value="true">
          <ia:ChangePropertyAction TargetObject="{Binding #textbox}" PropertyName="Text" Value="info2_blue.png" />

darinkes

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using System;

namespace Test.Desktop
{
    public class MyImage : Control

darinkes

    class GuiStateTemplate : DataTemplate, IDataTemplate
    {
        [TypeConverter(typeof(EnumConverter))]
        public GuiState State { get; set; }

        bool IDataTemplate.Match(object data)
        {
            var enumVal = (GuiState)Enum.Parse(typeof(GuiState), data.ToString());
            var result = State == enumVal;
            Logging.Debug(string.Format("GuiStateTemplate Match: {0} == {1} ({2})", State, enumVal, result));