What is XAML in WPF? Explained with Simple Examples

Image
In this article, we’ll dive into one of the core building blocks of WPF — XAML. We’ll explore how it works and why it plays such an important role in building modern desktop applications. What is XAML? XAML stands for eXtensible Application Markup Language. It’s a markup language used to design the user interface in WPF applications. XAML allows developers and designers to work separately, making the code cleaner and easier to manage. Think of it as HTML for WPF apps. XAML Syntax XAML uses XML-style syntax. Every UI element is an XML tag. Attributes define properties like height, width, and content. You can also nest elements inside others to create more complex layouts. For example, placing a TextBlock inside a Grid layout. <Grid>     <TextBlock Text="Hello, WPF World!"                 Width="200"                 Height="50"              ...

Validation By Exception (Display Error message by ToolTip) in Wpf using MVVM

View

<Window x:Class="WpfPrismTutorial.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfPrismTutorial"
        mc:Ignorable="d"
        prism:ViewModelLocator.AutoWireViewModel="True"
        xmlns:prism="http://prismlibrary.com/"
        xmlns:valid="clr-namespace:WpfPrismTutorial.Validations"
        Title="MainWindow" Height="450" Width="800">

    <Grid VerticalAlignment="Center" HorizontalAlignment="Left">
     
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="Validation by Exception" Margin="5,5"/>
             <TextBox Text="{Binding MainWindowModel.ValidationByException,UpdateSourceTrigger=PropertyChanged,
                        ValidatesOnExceptions=True}" x:Name="txt"  Height="30" Width="300">
                <TextBox.Style>
                    <Style TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
                        <Style.Triggers>
                            <Trigger  Property="Validation.HasError" Value="true">
                                <Setter Property="ToolTip" Value="Invalid input"/>
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </TextBox.Style>
            </TextBox>
        </StackPanel>
     
    </Grid>
</Window>


ViewModel 

 public class MainWindowViewModel : BindableBase
    {
        private MainWindowModel mainWindowModel = new MainWindowModel();

        public MainWindowModel MainWindowModel
        {
            get { return mainWindowModel; }
            set { SetProperty(ref mainWindowModel, value); }
        }
    }


Model

 public class MainWindowModel : BindableBase
    {
        #region Validation By Exception

        private string _validationByException = string.Empty;

        public string ValidationByException
        {
            get { return _validationByException; }
            set

            {
                if (string.IsNullOrEmpty(value))
                    throw new Exception("Validation By Exception should not empty");
                SetProperty(ref _validationByException, value);
            }
        }
        #endregion
    }

Comments

Popular posts from this blog

Filter DataGrid and ListView in wpf using ICollectionView

Pagination of DataGrid in WPF using MVVM

How to Create TabControl using Prism Region