WPF日积月累之文件监测与DataGrid指定Row的颜色

一、概述

关于DataGrid指定Row的颜色，我们可以使用转换器和DataGridRow的Style来实现。对于文件的检测，我们可以使用FileSystemWatcher来实现。

二、Demo

Converter代码如下：

using System;
using System.Windows.Data;
using System.Windows.Media;

namespace FileWatcher
{
    public class BGConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string operation = (string)value;
            switch(operation)
            {
                case "Created":
                    return Brushes.Green;
            
                case "Deleted":
                    return Brushes.Red;
                
                case "Renamed":
                    return Brushes.Orange;
                default:
                    return Brushes.Black;
            }
    
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return null;
        }
    }
}

前台代码如下：

<Window x:Class="FileWatcher.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:FileWatcher"
        mc:Ignorable="d"
        Title="FileWatcher" Height="434.877" Width="673.774"  Background="#FF387BB6">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
            <Label Content="文件夹路径：" Foreground="#FF224664"></Label>
            <TextBox Width="168" Margin="2 4 2 0" Name="tbxPath" Text="D:MyTestTest"></TextBox>
            <Button Content="开始监听" Margin="60 2 8 2" Click="Button_Click" Background="#FF2E76B6"/>
        </StackPanel>
        <DataGrid Grid.Row="1" Margin="5"  ItemsSource="{Binding FileCollection}" AutoGenerateColumns="False" Name="dataGrid"  CanUserAddRows="False">
            <DataGrid.Resources>
                <local:BGConverter x:Key="bgconverter"/>
                <Style TargetType="DataGridRow">
                    <Setter Property="Foreground" Value="{Binding Path=Operation, Converter={StaticResource bgconverter}}"/>
                </Style>
            </DataGrid.Resources>
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox x:Name="cbCheck"  HorizontalAlignment="Center"         
                                      IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"             
                                      Margin="3,2,0,0" Background="#07638a"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                    <DataGridTemplateColumn.Header>
                        <CheckBox x:Name="CheckAll"  Width="auto" Content="All"  Foreground="#F33A98E7" HorizontalAlignment="Center"                                       
                                  Background="Red" Margin="20 0 0 0"            
                                  IsChecked="{Binding DataContext.IsAllChecked, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=DataGrid}, UpdateSourceTrigger=PropertyChanged}"/>

                    </DataGridTemplateColumn.Header>
                </DataGridTemplateColumn>
                <DataGridTextColumn Width="100" Header="File" Binding="{Binding FileName}" IsReadOnly="True"/>
                <DataGridTextColumn Header="Path" Width="120"  Binding="{Binding FilePath}" IsReadOnly="True"/>
                <DataGridTextColumn Header="Operation" Width="100" Binding="{Binding Operation}" IsReadOnly="True"/>
                <DataGridTextColumn Header="Date" Width="120"  Binding="{Binding Date}" IsReadOnly="True"/>
                <DataGridTextColumn Header="Note" Width="150"  Binding="{Binding Note}" IsReadOnly="False"/>


            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

后台代码如下：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Windows;

namespace FileWatcher
{
    public abstract class ViewModelBase : INotifyPropertyChanged
    {
        public virtual string DisplayName { get; set; }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }

    }
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        private List<string> fileList = new List<string>();
        private ObservableCollection<FileInfo> fileCollection = new ObservableCollection<FileInfo>();
        public ObservableCollection<FileInfo> FileCollection
        {
            get { return fileCollection; }
            set
            {
                fileCollection = value;
                OnPropertyChanged("FileCollection");
            }
        }
        private bool isAllChecked;
        public bool IsAllChecked
        {
            get { return isAllChecked; }
            set
            {
                isAllChecked = value;
                OnPropertyChanged("IsAllChecked");

                for (int i = 0; i < FileCollection.Count; i++)
                {
                    FileCollection[i].IsChecked = isAllChecked;
                }
                //OnPropertyChanged("FilaCalibrationProtocols");
            }
        }
        FileSystemWatcher fsw = new FileSystemWatcher();
        public MainWindow()
        {
            InitializeComponent();
            dataGrid.DataContext = this;
            fsw.Path = @"C:";   //设置监控的文件目录
            fsw.Filter = "*.*";   //设置监控文件的类型
            fsw.NotifyFilter = NotifyFilters.FileName | NotifyFilters.DirectoryName | NotifyFilters.Size;   //设置文件的文件名、目录名及文件的大小改动会触发Changed事件

            fsw.Created += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);  //绑定事件触发后处理数据的方法。

            fsw.Deleted += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);

            fsw.Changed += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);

            fsw.Renamed += new RenamedEventHandler(this.fileSystemWatcher_Renamed);  //重命名事件与增删改传递的参数不一样。

        }
        private void fileSystemWatcher_EventHandle(object sender, FileSystemEventArgs e)  //文件增删改时被调用的处理方法
        {
            this.Dispatcher.BeginInvoke(
                new Action(() =>
                {
                  
                    var fileInfo = new FileInfo() { Operation = e.ChangeType.ToString(), Date = DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss"), FileName = e.Name, FilePath = e.FullPath, IsChecked = false };

                    if(e.ChangeType.ToString() == "Created")
                    {
                        var fileName = from file in fileList.Distinct()
                                       where file == e.Name
                                       select file;
                        if (fileName.Count() > 0)
                        {
                            fileInfo.Note = $"{e.Name} have already been {e.ChangeType} before.";
                            MessageBox.Show($"{e.Name} have already been {e.ChangeType} before.");
                        }
                    }
                 
                    fileCollection.Add(fileInfo);

                    fileList.Add(e.Name);
                })
         );

        }
        private void fileSystemWatcher_Renamed(object sender, RenamedEventArgs e)   //文件重命名时被调用的处理方法
        {
            this.Dispatcher.BeginInvoke(
               new Action(() =>
               {
                   fileCollection.Add(new FileInfo() { Operation = e.ChangeType.ToString(), Date = DateTime.Now.ToLongTimeString(), FileName = e.OldName + " --> " + e.Name, FilePath = e.FullPath, IsChecked = false });
                   fileList.Add(e.Name);
               })
        );
        
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if(Directory.Exists(tbxPath.Text))
            {
                fsw.Path = tbxPath.Text;
            }      
            fsw.EnableRaisingEvents = true;
        }
    }
    public class FileInfo : ViewModelBase
    {
        private bool isChecked;

        public bool IsChecked
        { get { return isChecked; } set { isChecked = value; OnPropertyChanged("IsChecked"); } }


        private string fileName;
        public string FileName
        {
            get { return fileName; }
            set { fileName = value; }
        }

        private string filePath;
        public string FilePath
        {
            get { return filePath; }
            set { filePath = value; }
        }

        private string operation;
        public string Operation
        {
            get { return operation; }
            set { operation = value; }
        }

        private string date;
        public string Date
        {
            get { return date; }
            set { date = value; }
        }

        private string note;
        public string Note
        {
            get { return note; }
            set { note = value; }
        }

    }
}

运行结果如下：