C# WPF 表单更改提示

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内容目录

实现效果
业务场景
编码实现
本文参考
源码下载

1.实现效果

未做修改的表单展示

表单变化，关闭窗体提示

来个Gif动态操作看看

2.业务场景

表单修改后，关闭窗体前检查提示

3.编码实现

3.1 添加Nuget库

使用 .Net Core 3.1 创建名为“ValidateDataChange”的WPF解决方案，添加两个Nuget库：MaterialDesignThemes和MaterialDesignColors。

MaterialDesign控件库

3.2 工程结构

4个文件变动：

App.xaml：添加MD控件样式
MainWindow.xaml：主窗口实现效果
MainWindow.xaml.cs：主窗口后台绑定及关闭验证
Contact.cs：绑定的实体

3.3 App.xaml引入MD控件样式

<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 主窗体 MainWindow.xaml

表单展示，使用MD控件的Snackbar作为消息提示

<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:SnackbarMessageContent="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

数据绑定，窗体关闭前表单验证：简单使用hashcode判断绑定实体是否有变化。

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", "632871194@qq.com", "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

联系人实体类

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();}}
}