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：

 1 using System;
 2 using System.Windows.Data;
 3 using System.Windows.Media;
 4
 5 namespace FileWatcher
 6 {
 7     public class BGConverter : IValueConverter
 8     {
 9         public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
10         {
11             string operation = (string)value;
12             switch(operation)
13             {
14                 case "Created":
15                     return Brushes.Green;
16
17                 case "Deleted":
18                     return Brushes.Red;
19
20                 case "Renamed":
21                     return Brushes.Orange;
22                 default:
23                     return Brushes.Black;
24             }
25
26         }
27
28         public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
29         {
30             return null;
31         }
32     }
33 }

前台代码如下：

 1 <Window x:Class="FileWatcher.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6         xmlns:local="clr-namespace:FileWatcher"
 7         mc:Ignorable="d"
 8         Title="FileWatcher" Height="434.877" Width="673.774"  Background="#FF387BB6">
 9     <Grid>
10         <Grid.RowDefinitions>
11             <RowDefinition Height="30"/>
12             <RowDefinition Height="*"/>
13         </Grid.RowDefinitions>
14         <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
15             <Label Content="文件夹路径：" Foreground="#FF224664"></Label>
16             <TextBox Width="168" Margin="2 4 2 0" Name="tbxPath" Text="D:\MyTest\Test"></TextBox>
17             <Button Content="开始监听" Margin="60 2 8 2" Click="Button_Click" Background="#FF2E76B6"/>
18         </StackPanel>
19         <DataGrid Grid.Row="1" Margin="5"  ItemsSource="{Binding FileCollection}" AutoGenerateColumns="False" Name="dataGrid"  CanUserAddRows="False">
20             <DataGrid.Resources>
21                 <local:BGConverter x:Key="bgconverter"/>
22                 <Style TargetType="DataGridRow">
23                     <Setter Property="Foreground" Value="{Binding Path=Operation, Converter={StaticResource bgconverter}}"/>
24                 </Style>
25             </DataGrid.Resources>
26             <DataGrid.Columns>
27                 <DataGridTemplateColumn>
28                     <DataGridTemplateColumn.CellTemplate>
29                         <DataTemplate>
30                             <CheckBox x:Name="cbCheck"  HorizontalAlignment="Center"
31                                       IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
32                                       Margin="3,2,0,0" Background="#07638a"/>
33                         </DataTemplate>
34                     </DataGridTemplateColumn.CellTemplate>
35                     <DataGridTemplateColumn.Header>
36                         <CheckBox x:Name="CheckAll"  Width="auto" Content="All"  Foreground="#F33A98E7" HorizontalAlignment="Center"
37                                   Background="Red" Margin="20 0 0 0"
38                                   IsChecked="{Binding DataContext.IsAllChecked, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=DataGrid}, UpdateSourceTrigger=PropertyChanged}"/>
39
40                     </DataGridTemplateColumn.Header>
41                 </DataGridTemplateColumn>
42                 <DataGridTextColumn Width="100" Header="File" Binding="{Binding FileName}" IsReadOnly="True"/>
43                 <DataGridTextColumn Header="Path" Width="120"  Binding="{Binding FilePath}" IsReadOnly="True"/>
44                 <DataGridTextColumn Header="Operation" Width="100" Binding="{Binding Operation}" IsReadOnly="True"/>
45                 <DataGridTextColumn Header="Date" Width="120"  Binding="{Binding Date}" IsReadOnly="True"/>
46                 <DataGridTextColumn Header="Note" Width="150"  Binding="{Binding Note}" IsReadOnly="False"/>
47
48
49             </DataGrid.Columns>
50         </DataGrid>
51     </Grid>
52 </Window>

后台代码如下：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Collections.ObjectModel;
  4 using System.ComponentModel;
  5 using System.IO;
  6 using System.Linq;
  7 using System.Windows;
  8
  9 namespace FileWatcher
 10 {
 11     public abstract class ViewModelBase : INotifyPropertyChanged
 12     {
 13         public virtual string DisplayName { get; set; }
 14
 15         public event PropertyChangedEventHandler PropertyChanged;
 16
 17         protected void OnPropertyChanged(string propertyName)
 18         {
 19             PropertyChangedEventHandler handler = PropertyChanged;
 20
 21             if (handler != null)
 22             {
 23                 handler(this, new PropertyChangedEventArgs(propertyName));
 24             }
 25         }
 26
 27     }
 28     /// <summary>
 29     /// Interaction logic for MainWindow.xaml
 30     /// </summary>
 31     public partial class MainWindow : Window, INotifyPropertyChanged
 32     {
 33         public event PropertyChangedEventHandler PropertyChanged;
 34
 35         protected void OnPropertyChanged(string propertyName)
 36         {
 37             PropertyChangedEventHandler handler = PropertyChanged;
 38
 39             if (handler != null)
 40             {
 41                 handler(this, new PropertyChangedEventArgs(propertyName));
 42             }
 43         }
 44         private List<string> fileList = new List<string>();
 45         private ObservableCollection<FileInfo> fileCollection = new ObservableCollection<FileInfo>();
 46         public ObservableCollection<FileInfo> FileCollection
 47         {
 48             get { return fileCollection; }
 49             set
 50             {
 51                 fileCollection = value;
 52                 OnPropertyChanged("FileCollection");
 53             }
 54         }
 55         private bool isAllChecked;
 56         public bool IsAllChecked
 57         {
 58             get { return isAllChecked; }
 59             set
 60             {
 61                 isAllChecked = value;
 62                 OnPropertyChanged("IsAllChecked");
 63
 64                 for (int i = 0; i < FileCollection.Count; i++)
 65                 {
 66                     FileCollection[i].IsChecked = isAllChecked;
 67                 }
 68                 //OnPropertyChanged("FilaCalibrationProtocols");
 69             }
 70         }
 71         FileSystemWatcher fsw = new FileSystemWatcher();
 72         public MainWindow()
 73         {
 74             InitializeComponent();
 75             dataGrid.DataContext = this;
 76             fsw.Path = @"C:\";   //设置监控的文件目录
 77             fsw.Filter = "*.*";   //设置监控文件的类型
 78             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
 79
 80             fsw.Created += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);  //绑定事件触发后处理数据的方法。
 81
 82             fsw.Deleted += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);
 83
 84             fsw.Changed += new FileSystemEventHandler(this.fileSystemWatcher_EventHandle);
 85
 86             fsw.Renamed += new RenamedEventHandler(this.fileSystemWatcher_Renamed);  //重命名事件与增删改传递的参数不一样。
 87
 88         }
 89         private void fileSystemWatcher_EventHandle(object sender, FileSystemEventArgs e)  //文件增删改时被调用的处理方法
 90         {
 91             this.Dispatcher.BeginInvoke(
 92                 new Action(() =>
 93                 {
 94
 95                     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 };
 96
 97                     if(e.ChangeType.ToString() == "Created")
 98                     {
 99                         var fileName = from file in fileList.Distinct()
100                                        where file == e.Name
101                                        select file;
102                         if (fileName.Count() > 0)
103                         {
104                             fileInfo.Note = $"{e.Name} have already been {e.ChangeType} before.";
105                             MessageBox.Show($"{e.Name} have already been {e.ChangeType} before.");
106                         }
107                     }
108
109                     fileCollection.Add(fileInfo);
110
111                     fileList.Add(e.Name);
112                 })
113          );
114
115         }
116         private void fileSystemWatcher_Renamed(object sender, RenamedEventArgs e)   //文件重命名时被调用的处理方法
117         {
118             this.Dispatcher.BeginInvoke(
119                new Action(() =>
120                {
121                    fileCollection.Add(new FileInfo() { Operation = e.ChangeType.ToString(), Date = DateTime.Now.ToLongTimeString(), FileName = e.OldName + " --> " + e.Name, FilePath = e.FullPath, IsChecked = false });
122                    fileList.Add(e.Name);
123                })
124         );
125
126         }
127
128         private void Button_Click(object sender, RoutedEventArgs e)
129         {
130             if(Directory.Exists(tbxPath.Text))
131             {
132                 fsw.Path = tbxPath.Text;
133             }
134             fsw.EnableRaisingEvents = true;
135         }
136     }
137     public class FileInfo : ViewModelBase
138     {
139         private bool isChecked;
140
141         public bool IsChecked
142         { get { return isChecked; } set { isChecked = value; OnPropertyChanged("IsChecked"); } }
143
144
145         private string fileName;
146         public string FileName
147         {
148             get { return fileName; }
149             set { fileName = value; }
150         }
151
152         private string filePath;
153         public string FilePath
154         {
155             get { return filePath; }
156             set { filePath = value; }
157         }
158
159         private string operation;
160         public string Operation
161         {
162             get { return operation; }
163             set { operation = value; }
164         }
165
166         private string date;
167         public string Date
168         {
169             get { return date; }
170             set { date = value; }
171         }
172
173         private string note;
174         public string Note
175         {
176             get { return note; }
177             set { note = value; }
178         }
179
180     }
181 }

运行结果如下：