I've made derived image control class, that accepts image path, but when I use binding, some images display other record image; although data is right. Is it image property invalidate or something?
https://giphy.com/gifs/2A67UcAnOIjLDDkBE7
ImageUserControl.cs
using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
namespace WpfApp1
{
static class BitmapHelpers
{
public static BitmapImage ToBitmapImage(Uri source)
{
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.UriSource = source;
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
bitmap.EndInit();
return bitmap;
}
public static string GetThumbnailPath(string fullPath)
{
return Path.Combine(Path.GetDirectoryName(fullPath),
"thumb" + Path.GetFileName(fullPath));
}
}
public class ImageUserControl : Image
{
public static readonly DependencyProperty CanOpenFileExternallyProperty;
public static readonly DependencyProperty UseThumbnailProperty;
public static readonly DependencyProperty UriSourceProperty;
private string OriginalPath { get; set; }
private string ThumbnailPath { get; set; }
static ImageUserControl()
{
UseThumbnailProperty = DependencyProperty.Register("UseThumbnail", typeof(bool),
typeof(ImageUserControl),
new FrameworkPropertyMetadata(false));
UriSourceProperty = DependencyProperty.Register("UriSource", typeof(string),
typeof(ImageUserControl),
new FrameworkPropertyMetadata(null, OnUriSourcePropertyChanged));
}
private static void OnUriSourcePropertyChanged(DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
ImageUserControl uc = d as ImageUserControl;
uc.UriSource = e.NewValue.ToString();
try
{
string value = e.NewValue.ToString();
uc.OriginalPath = value;
if (uc.UseThumbnail && !string.IsNullOrWhiteSpace(value))
{
uc.ThumbnailPath = BitmapHelpers.GetThumbnailPath(value);
if (System.IO.File.Exists(uc.ThumbnailPath))
{
uc.Source = BitmapHelpers.ToBitmapImage(new Uri(uc.ThumbnailPath));
return;
}
}
if (!string.IsNullOrWhiteSpace(value) && System.IO.File.Exists(value))
uc.Source = BitmapHelpers.ToBitmapImage(new Uri(value));
else
uc.Source = null;
}
catch { uc.Source = null; }
}
public const string UriSourcePropertyName = "UriSource";
public string UriSource
{
get
{
return (string)GetValue(UriSourceProperty);
}
set
{
SetValue(UriSourceProperty, value);
}
}
public event EventHandler ImageChanged;
public void OnImageChanged()
{
ImageChanged?.Invoke(this, null);
}
public ImageUserControl()
{
}
public bool UseThumbnail
{
get { return (bool)GetValue(UseThumbnailProperty); }
set { SetValue(UseThumbnailProperty, value); }
}
}
}StudentViewModel.cs
using WpfApp1.Model;
using System.Collections.ObjectModel;
namespace WpfApp1.ViewModel
{
public class StudentViewModel
{
public ObservableCollection<Student> Students { get; set; }
public void LoadStudents()
{
ObservableCollection<Student> students = new ObservableCollection<Student>();
students.Add(new Student { FirstName = "One", LastName = "Red", Image= @"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg" });
students.Add(new Student { FirstName = "Two", LastName = "Green", Image= @"C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg" });
students.Add(new Student { FirstName = "Three", LastName = "Blue", Image= @"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg" });
students.Add(new Student { FirstName = "Four", LastName = "Cyan", Image= @"C:\Users\Public\Pictures\Sample Pictures\Koala.jpg" });
students.Add(new Student { FirstName = "Five", LastName = "Magenta" });
students.Add(new Student { FirstName = "Six", LastName = "Yellow", Image = @"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg" });
students.Add(new Student { FirstName = "Seven", LastName = "Black", Image = @"C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg" });
students.Add(new Student { FirstName = "Eight", LastName = "White", Image = @"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg" });
students.Add(new Student { FirstName = "Nine", LastName = "Orange", Image = @"C:\Users\Public\Pictures\Sample Pictures\Koala.jpg" });
students.Add(new Student { FirstName = "Ten", LastName = "Gray" });
Students = students;
}
}
}MainWindow.xaml
<Window x:Class = "WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable = "d"
Loaded="StudentViewControl_Loaded"
Title = "MainWindow" Height = "350" Width = "525"><DataGrid Name="DataGridStudents" ItemsSource="{Binding Students}" AutoGenerateColumns="False" CanUserAddRows="False"><DataGrid.Columns><DataGridTemplateColumn><DataGridTemplateColumn.CellTemplate><DataTemplate><local:ImageUserControl Height="50" UriSource="{Binding Image, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" UseThumbnail="True" /></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn><DataGridTextColumn Header="FirstName" Binding="{Binding Image}" /><DataGridTextColumn Header="FirstName" Binding="{Binding FirstName}" /><DataGridTextColumn Header="LastName" Binding="{Binding LastName}" /></DataGrid.Columns></DataGrid></Window>
I've also tested derived imageusercontrol with custom property, when i scrolled window very fast. Data on that property somehow pointed other record property
