C# WPF 表單更改提示

時間 2020-01-08

標籤 c# wpf 表單更改提示欄目 C# 简体版

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C# WPF 表單更改提示

內容目錄git

實現效果
業務場景
編碼實現
本文參考
源碼下載

1.實現效果

未作修改的表單展現
github

表單變化，關閉窗體提示
express

來個Gif動態操做看看
c#

2.業務場景

表單修改後，關閉窗體前檢查提示微信

3.編碼實現

3.1 添加Nuget庫

使用 .Net Core 3.1 建立名爲「ValidateDataChange」的WPF解決方案，添加兩個Nuget庫：MaterialDesignThemes和MaterialDesignColors。app

MaterialDesign控件庫
ide

3.2 工程結構

4個文件變更：學習

App.xaml：添加MD控件樣式
MainWindow.xaml：主窗口實現效果
MainWindow.xaml.cs：主窗口後臺綁定及關閉驗證
Contact.cs：綁定的實體

3.3 App.xaml引入MD控件樣式

<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 主窗體 MainWindow.xaml

表單展現，使用MD控件的Snackbar做爲消息提示網站

<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="編輯聯繫人" 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="聯繫人" 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="郵件" 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，是否放棄修改？"
                ActionContent="放棄" ActionClick="SnackbarMessage_ActionClick"/>
        </materialDesign:Snackbar>
    </Grid>
</Window>

3.5 MainWindow.xaml.cs

數據綁定，窗體關閉前表單驗證：簡單使用hashcode判斷綁定實體是否有變化。

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)
        {
            //保存數據
        }

        private void SnackbarMessage_ActionClick(object sender, RoutedEventArgs e)
        {
            SnackbarUnsavedChanges.IsActive = false;
            discardChanges = true;
            this.Close();
        }
    }
}

3.6 Contact.cs

聯繫人實體類

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();
        }

    }
}