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Prepared chat application sample
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‎ChatApplication/ChatApplication.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.12.35521.163 d17.12
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChatApplication", "ChatApplication\ChatApplication.csproj", "{6BE82A5A-80DD-4553-A26D-FF454EB100EE}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{6BE82A5A-80DD-4553-A26D-FF454EB100EE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{6BE82A5A-80DD-4553-A26D-FF454EB100EE}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{6BE82A5A-80DD-4553-A26D-FF454EB100EE}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{6BE82A5A-80DD-4553-A26D-FF454EB100EE}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal

‎ChatApplication/ChatApplication/App.xaml‎

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<?xml version = "1.0" encoding = "UTF-8" ?>
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<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:ChatApplication"
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x:Class="ChatApplication.App">
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<Application.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<ResourceDictionary Source="Resources/Styles/Colors.xaml" />
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<ResourceDictionary Source="Resources/Styles/Styles.xaml" />
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</ResourceDictionary.MergedDictionaries>
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</ResourceDictionary>
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</Application.Resources>
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</Application>

‎ChatApplication/ChatApplication/App.xaml.cs‎

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namespace ChatApplication
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{
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public partial class App : Application
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{
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public App()
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{
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InitializeComponent();
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}
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protected override Window CreateWindow(IActivationState? activationState)
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{
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return new Window(new AppShell());
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}
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}
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}

‎ChatApplication/ChatApplication/AppShell.xaml‎

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<?xml version="1.0" encoding="UTF-8" ?>
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<Shell
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x:Class="ChatApplication.AppShell"
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xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:ChatApplication"
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Shell.FlyoutBehavior="Flyout"
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Title="ChatApplication">
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<ShellContent
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ContentTemplate="{DataTemplate local:MainPage}"
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Route="MainPage" />
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</Shell>

‎ChatApplication/ChatApplication/AppShell.xaml.cs‎

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namespace ChatApplication
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{
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public partial class AppShell : Shell
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{
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public AppShell()
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{
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InitializeComponent();
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}
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}
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}

‎ChatApplication/ChatApplication/ChatApplication.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
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<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net9.0-windows10.0.19041.0</TargetFrameworks>
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<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
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<!-- <TargetFrameworks>$(TargetFrameworks);net9.0-tizen</TargetFrameworks> -->
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<!-- Note for MacCatalyst:
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The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
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When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
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The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
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either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
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<!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
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<OutputType>Exe</OutputType>
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<RootNamespace>ChatApplication</RootNamespace>
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<UseMaui>true</UseMaui>
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<SingleProject>true</SingleProject>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<!-- Display name -->
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<ApplicationTitle>ChatApplication</ApplicationTitle>
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<!-- App Identifier -->
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<ApplicationId>com.companyname.chatapplication</ApplicationId>
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<!-- Versions -->
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<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
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<ApplicationVersion>1</ApplicationVersion>
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<!-- To develop, package, and publish an app to the Microsoft Store, see: https://aka.ms/MauiTemplateUnpackaged -->
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<WindowsPackageType>None</WindowsPackageType>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">15.0</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">15.0</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
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<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
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<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
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</PropertyGroup>
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<ItemGroup>
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<!-- App Icon -->
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<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
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<!-- Splash Screen -->
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<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
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<!-- Images -->
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<MauiImage Include="Resources\Images\*" />
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<MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />
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<!-- Custom Fonts -->
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<MauiFont Include="Resources\Fonts\*" />
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<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
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<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Maui.Controls" Version="9.0.21" />
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<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />
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<PackageReference Include="Syncfusion.Maui.ListView" Version="*" />
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</ItemGroup>
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</Project>

‎ChatApplication/ChatApplication/MainPage.xaml‎

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<?xml version="1.0" encoding="utf-8" ?>
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<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:listView="clr-namespace:Syncfusion.Maui.ListView;assembly=Syncfusion.Maui.ListView"
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xmlns:local="clr-namespace:ChatApplication"
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x:Class="ChatApplication.MainPage">
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<ContentPage.BindingContext>
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<local:ViewModel/>
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</ContentPage.BindingContext>
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<ContentPage.Resources>
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<ResourceDictionary>
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<DataTemplate x:Key="IncomingMessage">
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<Grid Padding="10,5">
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="Auto"/>
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<ColumnDefinition Width="*"/>
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</Grid.ColumnDefinitions>
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<Image WidthRequest="40" HeightRequest="40" HorizontalOptions="Start"
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VerticalOptions="Start" Margin="5"
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Source="{Binding ProfilePicture}">
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</Image>
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<StackLayout Grid.Column="1" Orientation="Vertical" Padding="5,0">
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<Label Text="{Binding Name}" TextColor="Gray" FontSize="12"
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FontAttributes="Bold" HorizontalOptions="Start"/>
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<Label Text="{Binding Text}" TextColor="Black" BackgroundColor="LightGray"
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Padding="10" MaximumWidthRequest="250"
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HorizontalOptions="StartAndExpand" VerticalOptions="Center"/>
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<Label Text="{Binding Timestamp, StringFormat='{0:HH:mm}'}"
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TextColor="Gray" FontSize="10" HorizontalOptions="Start"/>
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</StackLayout>
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</Grid>
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</DataTemplate>
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<DataTemplate x:Key="OutgoingMessage">
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<Grid Padding="10,5">
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="*" />
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<ColumnDefinition Width="Auto" />
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<ColumnDefinition Width="Auto"/>
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</Grid.ColumnDefinitions>
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<StackLayout Grid.Column="1" Orientation="Vertical" Padding="5,0"
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VerticalOptions="CenterAndExpand">
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<Label Text="{Binding Name}" TextColor="Gray" FontSize="12"
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FontAttributes="Bold" HorizontalOptions="End" />
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<Label Text="{Binding Text}" TextColor="White"
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BackgroundColor="DodgerBlue" Padding="10"
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HorizontalOptions="EndAndExpand" VerticalOptions="Center"
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MaximumWidthRequest="250" />
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<Label Text="{Binding Timestamp, StringFormat='{0:HH:mm}'}"
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TextColor="Gray" FontSize="10" HorizontalOptions="End"/>
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</StackLayout>
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<Image Grid.Column="2" WidthRequest="40" HeightRequest="40" Margin="5"
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HorizontalOptions="End" VerticalOptions="Start"
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Source="{Binding ProfilePicture}">
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</Image>
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</Grid>
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</DataTemplate>
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<local:MyDataTemplateSelector x:Key="dataTemplateSelector"
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IncomingDataTemplate="{StaticResource IncomingMessage}"
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OutgoingDataTemplate="{StaticResource OutgoingMessage}"/>
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</ResourceDictionary>
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</ContentPage.Resources>
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<listView:SfListView ItemsSource="{Binding Messages}"
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ItemTemplate="{StaticResource dataTemplateSelector}"
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AutoFitMode="Height">
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</listView:SfListView>
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</ContentPage>

‎ChatApplication/ChatApplication/MainPage.xaml.cs‎

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using System.Collections.ObjectModel;
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namespace ChatApplication
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{
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public partial class MainPage : ContentPage
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{
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public MainPage()
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{
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InitializeComponent();
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}
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}
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public class Message
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{
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public string? Name { get; set; }
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public string? Text { get; set; }
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public bool IsIncoming { get; set; }
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public string? ProfilePicture { get; set; }
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public DateTime Timestamp { get; set; }
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}
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public class ViewModel
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{
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public ObservableCollection<Message> Messages { get; set; }
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public ViewModel()
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{
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Messages = new ObservableCollection<Message>
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{
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new Message { Name = "You", Text = "Hi everyone! I'm very excited to share the news that our team is launching a new mobile application.", IsIncoming = false, ProfilePicture = "andrea.png", Timestamp = DateTime.Now.AddMinutes(-2)},
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new Message { Name = "Harrison", Text = "Oh, that's great!", IsIncoming = true, ProfilePicture = "harrison.png", Timestamp = DateTime.Now.AddMinutes(-1)},
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new Message { Name = "Margaret", Text = "That is a good news.", IsIncoming = true, ProfilePicture = "margaret.png", Timestamp = DateTime.Now.AddMinutes(2)},
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new Message { Name = "Nancy", Text = "Are we going to develop the app natively or as a hybrid?", IsIncoming = true, ProfilePicture = "nancy.png", Timestamp = DateTime.Now.AddMinutes(3)},
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new Message { Name = "You", Text = "We should develop this app using .NET MAUI, as it offers a native experience and performance while allowing for seamless cross-platform development.", IsIncoming = false, ProfilePicture = "andrea.png", Timestamp = DateTime.Now.AddMinutes(5)},
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new Message { Name = "Steven", Text = "I haven't heard of .NET MAUI. What's .NET MAUI?", IsIncoming = true, ProfilePicture = "steven.png", Timestamp = DateTime.Now.AddMinutes(7)},
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new Message { Name = "You", Text = ".NET MAUI is a new library that allows you to build native user interfaces for Android, iOS, macOS, and Windows from a single shared C# codebase.", IsIncoming = false, ProfilePicture = "andrea.png", Timestamp = DateTime.Now.AddMinutes(9)},
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new Message { Name = "David", Text = "That's impressive.", IsIncoming = true, ProfilePicture = "david.png", Timestamp = DateTime.Now.AddMinutes(10)},
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};
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}
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}
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public class MyDataTemplateSelector : DataTemplateSelector
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{
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public DataTemplate? IncomingDataTemplate { get; set; }
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public DataTemplate? OutgoingDataTemplate { get; set; }
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protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
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{
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if (item is Message message)
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{
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return message.IsIncoming ? IncomingDataTemplate : OutgoingDataTemplate;
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}
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return null;
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}
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}
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}

‎ChatApplication/ChatApplication/MauiProgram.cs‎

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using Microsoft.Extensions.Logging;
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using Syncfusion.Maui.Core.Hosting;
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namespace ChatApplication
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{
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public static class MauiProgram
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{
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public static MauiApp CreateMauiApp()
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{
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var builder = MauiApp.CreateBuilder();
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builder
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.UseMauiApp<App>()
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.ConfigureSyncfusionCore()
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.ConfigureFonts(fonts =>
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{
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fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
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fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
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});
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#if DEBUG
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builder.Logging.AddDebug();
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#endif
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return builder.Build();
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}
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}
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}

‎ChatApplication/ChatApplication/Platforms/Android/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
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<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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<uses-permission android:name="android.permission.INTERNET" />
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</manifest>

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