WPF：
<Window x:Class="simple.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:simple"
Title="MainWindow" ResizeMode="NoResize" Height="500" Width="530">
<Window.Resources>
<Style TargetType="{x:Type ListBox}">
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<Border BorderBrush="Black" BorderThickness="4" CornerRadius="5" Margin="6" >
<CheckBox x:Name="CheckBox" Checked="CheckBoxChecked" Unchecked="CheckBoxUnChecked" IsChecked="{Binding ElementName=BtnSelectAllOrUnSelectAll,Path=IsChecked,Mode=OneWay}">
<Image Source="{Binding }" Stretch="Fill" Width="100" Height="120" >
<Image.ToolTip>
<StackPanel>
<TextBlock Text="{Binding PixelWidth, StringFormat=Width: {0}}"/>
<TextBlock Text="{Binding PixelHeight, StringFormat=Height: {0}}"/>
<TextBlock Text="{Binding}" />
</StackPanel>
</Image.ToolTip>
</Image>
</CheckBox>
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Disabled"/>
</Style>
</Window.Resources>
<Window.DataContext>
<ObjectDataProvider ObjectType="{x:Type local:MainWindow}" MethodName="LoadImages" />
</Window.DataContext>
<Grid Margin="0,0,0,16" x:Name="grid">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<ListBox x:Name="ImageList" ItemsSource="{Binding}" Margin="-50,-8,93,0" RenderTransformOrigin="0.5,0.5" Height="289" VerticalAlignment="Top" >
<ListBox.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="0.975" ScaleY="0.997"/>
<SkewTransform AngleY="-8.98" AngleX="9.705"/>
<RotateTransform Angle="9.419"/>
<TranslateTransform Y="76.889" X="64.258"/>
</TransformGroup>
</ListBox.RenderTransform>
</ListBox>
<Button FontWeight="Bold" IsEnabled="False" Content="Download" Name="BtnDownloadImages" Click="DownloadImages" HorizontalAlignment="Left" Margin="286,383,0,0" VerticalAlignment="Top" Width="115" Height="57" RenderTransformOrigin="0.986,1.365"/>
<ToggleButton FontWeight="Bold" x:Name="BtnSelectAllOrUnSelectAll" Content="Select/Unselect" HorizontalAlignment="Left" Margin="53,383,0,0" VerticalAlignment="Top" Width="115" Height="57" RenderTransformOrigin="0.986,1.365"/>
<!--<ToolBarPanel HorizontalAlignment="Left" Height="17" Margin="315,366,0,0" VerticalAlignment="Top" Width="100"/>-->
<Button FontWeight="Bold" Height="21" HorizontalAlignment="Right" Margin="0,0,48,398" Name="BtnNext" VerticalAlignment="Bottom" Width="45" Content="Next" Click="ButtonClickNext" RenderTransformOrigin="0.289,0.571" />
<Button FontWeight="Bold" Content="Previous" Name="BtnPrevious" IsEnabled="False" HorizontalAlignment="Left" Margin="263,21,0,0" Click="ButtonClickPrevious" VerticalAlignment="Top" Width="54"/>
<StackPanel x:Name="loadButtons" HorizontalAlignment="Center" Orientation = "Horizontal" Height = "22" VerticalAlignment = "Top" Margin = "331,22,81,0" Width="110">
</StackPanel>
<Label FontWeight="Bold" Name="NumberOfSelectedImages" HorizontalAlignment="Left" Margin="24,36,0,0" VerticalAlignment="Top" ContentStringFormat="{}{0:0.##}" />
</Grid> </Window>
C＃：
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
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;
using System.Configuration;
using System.Xml;
namespace simple
{
public partial class MainWindow : Window
{
public MainWindow()
{
this.DataContext = check;
Loaded += MyWindow_Loaded;
}
public int buttonCount = 4;
public int btnPreviousImage = 0;
public int buttonCountPerPage = 4;
public int pageCount = 0;
List<string> checkboxCheckedList = new List<string>();
private int pageIndex = 1;
int checkboxCheckedCount = 0;
public static List<BitmapImage> imgcloudinaryImages = new List<BitmapImage>();
public static List<BitmapImage> copycloudinaryImages = new List<BitmapImage>();
int xmlUrlCount = 0;
public List<BitmapImage> LoadImages()
{
List<string> xmldataCount = new List<string>();
//List of images
List<BitmapImage> loadImagesPerPage = new List<BitmapImage>(); //
bool status = false;
XmlTextReader xmldatareader = new XmlTextReader(ConfigurationManager.AppSettings["XmlFileUrl"]);
while (xmldatareader.Read())
{
if (xmldatareader.Name == "collection")
{
if (status)
status = false;
else
status = true;
}
if (status && (xmldatareader.NodeType == XmlNodeType.Element) && (xmldatareader.Name == "image"))
{
if (xmldatareader.HasAttributes)
{
xmldataCount.Add(xmldatareader.GetAttribute("url"));
}
}
}
foreach (var URL in xmldataCount)
{
var imgBitmap = new BitmapImage(new Uri(URL));
imgcloudinaryImages.Add(imgBitmap);
}
foreach (var image in imgcloudinaryImages)
{
xmlUrlCount += 1;
loadImagesPerPage.Add(image);
if (xmlUrlCount == int.Parse(ConfigurationManager.AppSettings["LoadImagesPerPage"]))
break;
}
copycloudinaryImages = imgcloudinaryImages;
return loadImagesPerPage;
}
private void MyWindow_Loaded(object sender, RoutedEventArgs e)
{
int totalImages = copycloudinaryImages.Count;
int pageSize = 6;
if (totalImages % pageSize == 0)
{
pageCount = totalImages / pageSize;
}
else
{
pageCount = (totalImages / pageSize) + 1;
}
loadButtons.Children.Clear();
for (int i = 0; i < pageCount; i++)
{
Button button = new Button()
{
Content = (i + 1).ToString(),
Tag = i
};
button.Width = 20;
button.Height = 20;
button.Click += new RoutedEventHandler(LoadButton);
loadButtons.Children.Add(button);
}
if (pageCount <= 4)
BtnNext.IsEnabled = false;
}
private void DownloadImages(object sender, RoutedEventArgs e)
{
try
{
Array.ForEach(Directory.GetFiles(ConfigurationManager.AppSettings["LocalFileUrl"]), File.Delete);
foreach (var
source in checkboxCheckedList)
{
int j = 1;
string remoteFileUrl = source;
string localFileName = ConfigurationManager.AppSettings["LocalFileUrl"] + "download" + j + ".JPG";
WebClient webClient = new WebClient();
while (File.Exists(localFileName))
{
j += 1;
localFileName = ConfigurationManager.AppSettings["LocalFileUrl"] + "download" + j + ".JPG";
}
webClient.DownloadFile(remoteFileUrl, localFileName);
}
if (checkboxCheckedList.Count > 0)
{
MessageBox.Show("Image Downloaded Successfully");
}
else
{
MessageBox.Show("No Image Selected");
}
}
catch (Exception e1)
{
MessageBox.Show(e1.Message);
}
}
public List<CheckBox> check = new List<CheckBox>();
private void CheckBoxChecked(object sender, RoutedEventArgs e)
{
copycloudinaryImages = imgcloudinaryImages;
BtnDownloadImages.IsEnabled = true;
string imagepath = Convert.ToString(((CheckBox)sender).DataContext);
if (imagepath == "{DisconnectedItem}")
{
checkboxCheckedCount += 1;
}
else
{
if (checkboxCheckedCount < 30)
{
checkboxCheckedList.Add(imagepath);
checkboxCheckedCount += 1;
NumberOfSelectedImages.Content = checkboxCheckedCount + " Item Selected";
}
else
{
if (((CheckBox)sender).IsChecked == true)
{
checkboxCheckedCount += 1;
CheckBox myCheckBox = new CheckBox();
myCheckBox = ((CheckBox)sender);
check.Add(myCheckBox);
((CheckBox)sender).IsChecked = false;
((CheckBox)sender).IsEnabled = false;
}
}
}
}
private void CheckBoxUnChecked(object sender, RoutedEventArgs e)
{
checkboxCheckedCount -= 1;
if (checkboxCheckedCount <= 29)
{
if (checkboxCheckedCount == 0)
{
}
else
{
//checkboxCheckedCount -= 1;
foreach (var item in check)
{
item.IsEnabled = true;
}
}
}
else
{
foreach (var item in check)
{
item.IsEnabled = false;
}
}
string imagepath = Convert.ToString(((CheckBox)sender).DataContext);
checkboxCheckedList.Remove(imagepath);
NumberOfSelectedImages.Content = checkboxCheckedCount + " Item Selected";
}
private void ButtonClickNext(object sender, System.EventArgs e)
{
int totalImages = copycloudinaryImages.Count;
int pageSize = 6;
if (totalImages % pageSize == 0)
{
pageCount = totalImages / pageSize;
}
else
{
pageCount = (totalImages / pageSize) + 1;
}
int noOfButtonsLoad = 4;
loadButtons.Children.Clear();
if (BtnPrevious.IsEnabled == false)
{
buttonCount = 4;
buttonCountPerPage = 4;
}
if ((noOfButtonsLoad*pageSize) <=totalImages)
{
for (int i = 1; i <= noOfButtonsLoad; i++)
{
if (pageCount == buttonCount + i)
{
BtnNext.IsEnabled = false;
break;
}
if (buttonCountPerPage == pageCount - 1)
{
break;
}
Button button = new Button()
{
Content = (i + buttonCount).ToString(),
Tag = i + buttonCount
};
button.Width = 20;
button.Height = 20;
button.Click += new RoutedEventHandler(LoadButton);
loadButtons.Children.Add(button);
btnPreviousImage = i;
buttonCountPerPage += 1;
if (i == 4)
buttonCount += i;
}
}
BtnPrevious.IsEnabled = true;
}
void LoadButton(object sender, RoutedEventArgs e)
{
pageIndex = (int)(sender as Button).Tag;
ImageList.DataContext = copycloudinaryImages.Skip(6 * pageIndex).Take(6).ToList();
// ImageList.UpdateLayout();
}
private void ButtonClickPrevious(object sender, System.EventArgs e)
{
BtnNext.IsEnabled = true;
int back = 0;
loadButtons.Children.Clear();
if (buttonCountPerPage - 4 <= 0)
{
back = buttonCountPerPage;
for (int i = 1; i <= back; i++)
{
Button button = new Button()
{
Content = (i).ToString(),
Tag = i
};
button.Width = 20;
button.Height = 20;
button.Click += new RoutedEventHandler(LoadButton);
loadButtons.Children.Add(button);
}
BtnPrevious.IsEnabled = false;
}
else
{
back = buttonCountPerPage - 4;
for (int i = back; i <= buttonCountPerPage - 1; i++)
{
Button button = new Button()
{
Content = (i).ToString(),
Tag = i
};
button.Width = 20;
button.Height = 20;
button.Click += new RoutedEventHandler(LoadButton);
loadButtons.Children.Add(button);
}
buttonCountPerPage -= 4;
}
btnPreviousImage -= 4;
if (back == 1)
BtnPrevious.IsEnabled = false;
if (BtnPrevious.IsEnabled == false)
buttonCount = 0;
}
}
}
当我单击选择所有按钮时，它会选择所有图像，但它仅添加6个图像用于列表。请帮我。当我尝试在checkbox_checked事件中调试代码时，我使用select / unselect按钮选择所有图像，但是一些图像与datacontext断开连接。 DisconncetedItems来自不同的datacontext。如何解决它。 请帮帮我
答案 0 :(得分：0)
ListBox默认使用UI虚拟化。将该属性设置为false以停止获取断开连接的项目。
<ListBox VirtualizingStackPanel.IsVirtualizing="False"/>