WPF显示SQLITE数据(四)--分页显示
作者：互联网
目前使用的WPF CORE做的BOSS网站数据显示，是在DataGrid中一次性显示数据，这样如果数据量大了，会对系统有一定压力，所以一般需要分页进行显示，显示中我参考了网上的一些已由控件，加入我的程序中，达到了分页效果。
因为目前.net 5已经整合了.net core 3和.net Framework的功能，所以估计以后的趋势WPF也会都使用net core类库了，但是在开发使用中，发现目前的WPF CORE中无法添加WPF窗体和控件，经过多次试验，可以修改项目的.csproj文件，将<Project Sdk="Microsoft.NET.Sdk">改为<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">，然后直接添加一个已经写好的xaml分页控件(网上下载的，如果自己开发，又需要许多时间)，控件代码如下：
1 <UserControl x:Class="WpfApp1.DataGridPage"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
6 mc:Ignorable="d" Background="Transparent">
7 <UserControl.Resources>
8 <!--每页{0}/共{0}条-->
9 <Style x:Key="PageTextBlock1" TargetType="{x:Type TextBlock}">
10 <Setter Property="VerticalAlignment" Value="Center" />
11 <Setter Property="HorizontalAlignment" Value="Left" />
12 <Setter Property="FontSize" Value="13" />
13 <Setter Property="FontWeight" Value="Bold" />
14 </Style>
15 <!--首页上一页等-->
16 <Style x:Key="PageTextBlock2" TargetType="{x:Type TextBlock}">
17 <Setter Property="VerticalAlignment" Value="Center" />
18 <Setter Property="HorizontalAlignment" Value="Left" />
19 <Setter Property="Margin" Value="0,10,0,0" />
20 <Setter Property="Width" Value="40" />
21 <Setter Property="Height" Value="23" />
22 <Setter Property="FontSize" Value="13" />
23 <Setter Property="Cursor" Value="Hand" />
24 <Style.Triggers>
25 <Trigger Property="IsMouseOver" Value="True">
26 <Setter Property="Foreground" Value="#FF000000" />
27 <Setter Property="FontWeight" Value="Bold" />
28 </Trigger>
29 </Style.Triggers>
30 </Style>
31
32 </UserControl.Resources>
33 <Grid>
34 <Border CornerRadius="3" Background="Transparent" BorderBrush="#01544A" BorderThickness="1">
35 <Grid HorizontalAlignment="Stretch" Margin="5 0 1 0" VerticalAlignment="Top" Width="Auto" Height="25">
36 <Grid.ColumnDefinitions>
37 <ColumnDefinition Width="100"/>
38 <ColumnDefinition Width="300*" MinWidth="300"/>
39 </Grid.ColumnDefinitions>
40 <TextBlock Name="tbkRecords" Grid.Column="0" Style="{StaticResource PageTextBlock1}" Foreground="#01544A" Visibility="Visible" />
41 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Grid.Column="1">
42 <Grid>
43 <Grid.RowDefinitions >
44 <RowDefinition Height="30"></RowDefinition>
45 </Grid.RowDefinitions>
46 <Grid.ColumnDefinitions>
47 <ColumnDefinition Width="50"/>
48 <ColumnDefinition Width="50"/>
49 <ColumnDefinition Width="120*"/>
50 <ColumnDefinition Width="50"/>
51 <ColumnDefinition Width="30"/>
52 </Grid.ColumnDefinitions>
53 <TextBlock Grid.Column="0" Name="btnFirst" Text=" 首页" IsEnabled="False" Style="{StaticResource PageTextBlock2}" MouseDown="btnFirst_MouseDown"/>
54 <TextBlock Grid.Column="1" Name="btnPrev" Text="上一页" IsEnabled="False" Style="{StaticResource PageTextBlock2}" MouseDown="btnPrev_MouseDown" />
55 <Grid Grid.Column="2" Name="grid" Visibility="Visible" >
56 <TextBlock Text="第" Style="{StaticResource PageTextBlock2}" Width="15" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="0"></TextBlock>
57 <TextBox Width="30" Name="page" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="20,0,0,0"></TextBox>
58 <TextBlock HorizontalAlignment="Left" Width="60" VerticalAlignment="Bottom" Name="countPage" Text="页/共页" Style="{StaticResource PageTextBlock2}" Margin="55,0,0,0"></TextBlock>
59 <Button Name="btnGO" Content="GO" Width="25" Height="20" VerticalAlignment="Center" Margin="115,0,10,0" Click="btnGO_Click"></Button>
60 </Grid>
61 <TextBlock Grid.Column="3" Name="btnNext" Text="下一页" IsEnabled="False" Style="{StaticResource PageTextBlock2}" MouseDown="btnNext_MouseDown" Height="22" Margin="0,8,0,0" />
62 <TextBlock Grid.Column="4" Name="btnLast" Text="末页" IsEnabled="False" Style="{StaticResource PageTextBlock2}" MouseDown="btnLast_MouseDown"/>
63
64 </Grid>
65 </StackPanel>
66 </Grid>
67 </Border>
68 </Grid>
69 </UserControl>
主窗体的调用代码为：
1 using System.Data.SQLite;
2 using System.IO;
3 using System;
4 using System.Windows;
5 using System.Windows.Input;
6 using System.Windows.Media;
7 using System.Windows.Media.Imaging;
8 using System.Windows.Navigation;
9 using System.Windows.Shapes;
10 using System.Windows.Controls;
11 using System.Diagnostics;
12 using System.Data;
13
14 namespace WpfApp1
15 {
16 /// <summary>
17 /// Interaction logic for MainWindow.xaml
18 /// </summary>
19 public partial class MainWindow : Window
20 {
21 public MainWindow()
22 {
23 InitializeComponent();
24 }
25
26 // 数据库文件夹
27 static string DbPath = @"E:\mycsample\Boss\bin\x64\Debug\net5.0-windows";
28 System.Data.DataTable Dt = new System.Data.DataTable();
29
30 //与指定的数据库(实际上就是一个文件)建立连接
31 private static SQLiteConnection CreateDatabaseConnection(string dbName = null)
32 {
33 if (!string.IsNullOrEmpty(DbPath) && !Directory.Exists(DbPath))
34 Directory.CreateDirectory(DbPath);
35 dbName = dbName == null ? "mytest.db" : dbName;
36 var dbFilePath = System.IO.Path.Combine(DbPath, dbName);
37 return new SQLiteConnection("DataSource = " + dbFilePath+"; Pooling = true; FailIfMissing = false");
38 }
39
40 // 使用全局静态变量保存连接
41 private static SQLiteConnection connection = CreateDatabaseConnection();
42
43 // 判断连接是否处于打开状态
44 private static void Open(SQLiteConnection connection)
45 {
46 if (connection.State != System.Data.ConnectionState.Open)
47 {
48 connection.Open();
49 }
50 }
51
52 public static void ExecuteNonQuery(string sql)
53 {
54 // 确保连接打开
55 Open(connection);
56 using (var tr = connection.BeginTransaction())
57 {
58 using (var command = connection.CreateCommand())
59 {
60 command.CommandText = sql;
61 command.ExecuteNonQuery();
62 }
63 tr.Commit();
64 }
65 }
66
67 public static SQLiteDataReader ExecuteQuery(string sql)
68 {
69 // 确保连接打开
70 Open(connection);
71 using (var tr = connection.BeginTransaction())
72 {
73 using (var command = connection.CreateCommand())
74 {
75 command.CommandText = sql;
76 // 执行查询会返回一个SQLiteDataReader对象
77 var reader = command.ExecuteReader();
78 tr.Commit();
79 return reader;
80 //reader.Read()方法会从读出一行匹配的数据到reader中。注意：是一行数据。
81 //while (reader.Read())
82 //{
83 // // 有一系列的Get方法，方法的参数是列数。意思是获取第n列的数据，转成Type返回。
84 // // 比如这里的语句，意思就是：获取第0列的数据，转成int值返回。
85 // var time = reader.GetInt64(0);
86 //}
87 }
88 //tr.Commit();
89 }
90 }
91
92 private static void DeleteDatabase(string dbName)
93 {
94 var path = System.IO.Path.Combine(DbPath, dbName);
95 connection.Close();
96
97 // 置空，手动GC，并等待GC完成后执行文件删除。
98 connection = null;
99 GC.Collect();
100 GC.WaitForPendingFinalizers();
101 File.Delete(path);
102 }
103
104 private void Hyperlink_Click(object sender, RoutedEventArgs e)
105 {
106 System.Windows.Documents.Hyperlink link = (System.Windows.Documents.Hyperlink)e.OriginalSource;
107 //Process.Start("IEXPLORE.EXE",link.NavigateUri.AbsoluteUri);
108 string url = link.NavigateUri.AbsoluteUri;
109 Process p = new Process();
110 p.StartInfo.FileName = "cmd.exe";
111 p.StartInfo.UseShellExecute = false; //不使用shell启动
112 p.StartInfo.RedirectStandardInput = true;//喊cmd接受标准输入
113 p.StartInfo.RedirectStandardOutput = false;//不想听cmd讲话所以不要他输出
114 p.StartInfo.RedirectStandardError = true;//重定向标准错误输出
115 p.StartInfo.CreateNoWindow = true;//不显示窗口
116 p.Start();
117
118 //向cmd窗口发送输入信息 后面的&exit告诉cmd运行好之后就退出
119 p.StandardInput.WriteLine("start " + url + "&exit");
120 p.StandardInput.AutoFlush = true;
121 p.WaitForExit();//等待程序执行完退出进程
122 p.Close();
123 }
124
125 private void button_Click(object sender, RoutedEventArgs e)
126 {
127 SQLiteDataReader sr = ExecuteQuery("select id,title,url from one_level order by id");
128 if (sr != null)
129 {
130 Dt.Load(sr);
131 gridpage.ShowPages(dataGrid, Dt, 10);
132 //dataGrid.ItemsSource = Dt.DefaultView;
133 }
134 }
135
136 private void dataGrid_LoadingRow(object sender, DataGridRowEventArgs e)
137 {
138 e.Row.Header = e.Row.GetIndex() + 1;
139 }
140
141 private void dataGrid_UnLoadingRow(object sender, DataGridRowEventArgs e)
142 {
143 dataGrid_LoadingRow(sender, e);
144 if (dataGrid.Items != null)
145 {
146 for (int i = 0; i < dataGrid.Items.Count; i++)
147 {
148 try
149 {
150 DataGridRow row = dataGrid.ItemContainerGenerator.ContainerFromIndex(i) as DataGridRow;
151 if (row != null)
152 {
153 row.Header = (i + 1).ToString();
154 }
155 }
156 catch { }
157 }
158 }
159 }
160
161 private void Window_Loaded(object sender, RoutedEventArgs e)
162 {
163 //dataGrid.LoadingRow += new EventHandler<DataGridRowEventArgs>(dataGrid_LoadingRow);
164 //dataGrid.UnloadingRow += new EventHandler<DataGridRowEventArgs>(dataGrid_UnLoadingRow);
165 }
166 }
167 }
最后可以看到分页后的效果。
标签：SQLITE,--,System,private,dataGrid,Windows,connection,using,WPF 来源： https://www.cnblogs.com/djcsch2001/p/15451842.html