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C # WPF form prompt changes
Content Directory
- Achieve results
- Business scene
- Coding
- Reference article
- Source download
1. To achieve the effect
Form display without making changes
Form changes, close the form tips
Gif look to a dynamic operation
2. Business scene
When the form changes and close the window before the examination tips
3. Coding
3.1 Add Nuget library
Use .Net Core 3.1 to create WPF called "ValidateDataChange" solution, add two Nuget libraries: MaterialDesignThemes and MaterialDesignColors.
MaterialDesign control library
3.2 of engineering structures
4 file changes:
- App.xaml: Adding MD control style
- MainWindow.xaml: the main window to achieve results
- MainWindow.xaml.cs: The main window is closed and the background binding verification
- Contact.cs: entity bound
3.3 App.xaml introduction MD control style
<Application x:Class="ValidateDataChange.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ValidateDataChange"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml"/>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml"/>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml"/>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Blue.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>3.4 The main form MainWindow.xaml
Forms display, the MD control as a message prompts Snackbar
<Window x:Class="ValidateDataChange.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:ValidateDataChange"
mc:Ignorable="d"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
Title="编辑联系人" Height="500" Width="400" ResizeMode="NoResize" FontFamily="Roboto"
FontSize="14" WindowStartupLocation="CenterScreen" Closing="Window_Closing">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="100"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<materialDesign:ColorZone Mode="PrimaryMid" Grid.Row="0" VerticalAlignment="Stretch">
<TextBlock Text="联系人" VerticalAlignment="Center" Margin="20" FontSize="30"/>
</materialDesign:ColorZone>
<StackPanel Margin="10 30" Grid.Row="1">
<Grid>
<materialDesign:PackIcon Kind="Face" VerticalAlignment="Bottom" Margin="2 12" Foreground="{Binding BorderBrush, ElementName=TextBoxName}"/>
<TextBox x:Name="TextBoxName" Margin="5" materialDesign:HintAssist.Hint="名字" Padding="8 0 0 0" Text="{Binding Name}"
Style="{StaticResource MaterialDesignFloatingHintTextBox}"/>
</Grid>
<Grid>
<materialDesign:PackIcon Kind="At" VerticalAlignment="Bottom" Margin="2 12" Foreground="{Binding BorderBrush, ElementName=TextBoxEmail}"/>
<TextBox x:Name="TextBoxEmail" Margin="5" materialDesign:HintAssist.Hint="邮件" Padding="8 0 0 0" Text="{Binding Email}"
Style="{StaticResource MaterialDesignFloatingHintTextBox}"/>
</Grid>
<Grid>
<StackPanel Orientation="Horizontal" VerticalAlignment="Bottom" Margin="2 10">
<materialDesign:PackIcon Kind="Facebook" Foreground="{Binding BorderBrush, ElementName=TextBoxFacebook}"/>
<TextBlock Text="facebook.com/" Foreground="{Binding BorderBrush, ElementName=TextBoxFacebook}"/>
</StackPanel>
<TextBox x:Name="TextBoxFacebook" Margin="5" materialDesign:HintAssist.Hint="Facebook" Padding="54 0 0 0" Text="{Binding Facebook}"
Style="{StaticResource MaterialDesignFloatingHintTextBox}"/>
</Grid>
</StackPanel>
<Button Grid.RowSpan="2" Margin="50 72" HorizontalAlignment="Right" VerticalAlignment="Top" Style="{StaticResource MaterialDesignFloatingActionAccentButton}"
Click="Button_Click">
<materialDesign:PackIcon Kind="ContentSave"/>
</Button>
<materialDesign:Snackbar Grid.Row="1" HorizontalAlignment="Stretch" x:Name="SnackbarUnsavedChanges" VerticalAlignment="Bottom">
<materialDesign:SnackbarMessage
Content="有未保存的更改，是否放弃修改？"
ActionContent="放弃" ActionClick="SnackbarMessage_ActionClick"/>
</materialDesign:Snackbar>
</Grid>
</Window>3.5 MainWindow.xaml.cs
Binding data, form validation before the form is closed: using simple hashcode determines whether the binding entity changes.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace ValidateDataChange
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
int hash;
bool discardChanges;
public MainWindow()
{
InitializeComponent();
discardChanges = false;
var contact = new Contact("Dotnet9", "[email protected]", "Dotnet9");
hash = contact.GetHashCode();
this.DataContext = contact;
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (this.DataContext.GetHashCode() != hash && !discardChanges)
{
SnackbarUnsavedChanges.IsActive = true;
e.Cancel = true;
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
//保存数据
}
private void SnackbarMessage_ActionClick(object sender, RoutedEventArgs e)
{
SnackbarUnsavedChanges.IsActive = false;
discardChanges = true;
this.Close();
}
}
}3.6 Contact.cs
Contact entity class
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
namespace ValidateDataChange
{
internal class Contact : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
private string name;
public string Name
{
get { return name; }
set { name = value; NotifyPropertyChanged("Name"); }
}
private string email;
public string Email
{
get { return email; }
set { email = value; NotifyPropertyChanged("Email"); }
}
private string facebook;
public string Facebook
{
get { return facebook; }
set { facebook = value; NotifyPropertyChanged("Facebook"); }
}
public Contact(string name, string email, string facebook)
{
this.name = name;
this.email = email;
this.facebook = facebook;
}
public override int GetHashCode()
{
return (name + email + facebook).GetHashCode();
}
}
}4. Reference herein
Design com WPF Great God of learning videos: the Validate the Data Change
Open Source Control Library: MaterialDesignInXamlToolkit
site introduction to the MD of open source control library: Controls Introduction
5. Codes
Github Source Download: Download
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