	[x] Posted via EE Mobile
	Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.

Question

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

9.4

Observable Collection Not Dispalying in WPF Listbox

Asked by cardinalone in WPF and Silverlight

I am using an ObservableCollection in a C# class that picks up image files via a FileWatcher.
The FullPath property of my class is bound to my WPF ListBOx but nothing shows in the listbox.

View the Solution FREE for 30 Days

         
           
             1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101:
102:
103:
104:
105:
106:
107:
108:
109:
110:
111:
112:
113:
114:
115:
116:
117:
118:
119:
120:
121:
122:
123:
124:
125:
126:
127:
128:
129:
130:
131:
132:
133:
134:
135:
136:
137:
138:
139:
140:
141:
142:
143:
144:
145:
146:
147:
148:
149:
150:
151:
152:
153:
154:
155:
156:
157:
158:
159:
160:
161:
162:
163:
164:
165:
166:
167:
168:
169:
170:
171:
172:
173:
174:
175:
176:
177:
178:
179:
180:
181:
182:
183:
184:
185:
186:
187:
188:
189:
190:
191:
192:
193:
194:
195:
196:
197:
198:
199:
200:
201:
202:
203:
204:
205:
206:
207:
208:
209:
210:
211:
212:
213:
214:
215:
216:
217:
218:

           
           
             using System;
using System.IO;
 
namespace Wpf_SomethingFishy
{
    public class FishBook
    {
        string name;
        DateTime dateTime;
        string size;
        string path;
 
        public FishBook(string filename)
        {
            FileInfo info = new FileInfo(filename);
            size = (info.Length / 1024).ToString("N0") + " KB";
            dateTime = info.LastWriteTime;
            name = info.Name;
            path = info.DirectoryName;
        }
 
        public string Name
        {
            get { return name; }
        }
 
        public DateTime DateTime
        {
            get { return dateTime; }
        }
 
        public string Size
        {
            get { return size; }
        }
 
        public string Path
        {
            get { return path; }
        }
 
        public string FullPath
        {
            get { return System.IO.Path.Combine(Path, Name); }
        }
 
        public override string ToString()
        {
            return FullPath;
        }
    }
}
 
 
using System;
using System.IO;
using System.Collections.Generic;
using System.Collections.ObjectModel;
 
namespace Wpf_SomethingFishy
{
    public class FishBooks : ObservableCollection<FishBook>
    {
        Dictionary<string, FileSystemWatcher> watchers = new Dictionary<string, FileSystemWatcher>();
 
        public event EventHandler ItemsUpdated;
 
        protected override void ClearItems()
        {
            base.ClearItems();
            watchers.Clear();
        }
 
        protected override void InsertItem(int index, FishBook item)
        {
            base.InsertItem(index, item);
            if (!watchers.ContainsKey(item.Path))
            {
                FileSystemWatcher watcher = new FileSystemWatcher(item.Path, "*.png");
                watcher.EnableRaisingEvents = true;
                watcher.Created += new System.IO.FileSystemEventHandler(OnPhotoCreated);
                watcher.Deleted += new System.IO.FileSystemEventHandler(OnPhotoDeleted);
                watchers.Add(item.Path, watcher);
            }
        }
 
 
        void OnPhotoDeleted(object sender, System.IO.FileSystemEventArgs e)
        {
            int index = -1;
            for (int i = 0; i < Items.Count; i++)
            {
                if (Items[i].FullPath == e.FullPath)
                {
                    index = i;
                    break;
                }
            }
            if (index >= 0)
                Items.RemoveAt(index);
 
            if (ItemsUpdated != null)
                ItemsUpdated(this, new EventArgs());
        }
 
        void OnPhotoCreated(object sender, System.IO.FileSystemEventArgs e)
        {
            Items.Add(new FishBook(e.FullPath));
 
            if (ItemsUpdated != null)
                ItemsUpdated(this, new EventArgs());
        }
    }
}
 
 
<Window x:Class="Wpf_SomethingFishy.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:src="clr-namespace:Wpf_SomethingFishy"
    Title="Under the Sea" Height="750" Width="590" WindowStyle="SingleBorderWindow" Background="Transparent">
    <Window.Resources>
        <src:FishBooks x:Key="FishBooksData"/>
        <LinearGradientBrush x:Key="ButtonBrushOrange" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Offset="0.45" Color="Orange" />
            <GradientStop Offset="0.45" Color="Orange" />
            <GradientStop Offset="0.6" Color="DarkOrange" />
            <GradientStop Offset="0.9" Color="DarkOrange" />
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="ButtonBrushBlack" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Offset="0.45" Color="DarkSlateGray"  />
            <GradientStop Offset="0.45" Color="DarkSlateGray" />
            <GradientStop Offset="0.6" Color="Black" />
            <GradientStop Offset="0.9" Color="Black" />
        </LinearGradientBrush>
        <ControlTemplate x:Key="buttonControlTemplate">
            <Grid Width="150" Height="Auto" >
                <Ellipse x:Name="Disc" Width="125" Height="125" Fill="{StaticResource ButtonBrushBlack}"></Ellipse>
                <Viewbox>
                    <ContentPresenter Margin="1" Content="{TemplateBinding Button.Content}"/>
                </Viewbox>
            </Grid>
        </ControlTemplate>
        <HierarchicalDataTemplate DataType="NavItems" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\shiirafish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@Header}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="NavItem" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\babelfish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@Type}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="NavItem1" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\redFish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@SubType}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="Fish" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\fish-1.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=Fish}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <XmlDataProvider x:Key="BlueDataProvider" XPath="NavItems" Source="BlueNavItems.xml" />
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </Window.Resources>
    
    <Grid Background="{StaticResource ButtonBrushOrange}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="220"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="0" VerticalAlignment="Top" Height="155">
        <WrapPanel  HorizontalAlignment="Left" Grid.Column="0" >
        <Button Template="{StaticResource buttonControlTemplate}" Click="btnGo_Click" >
            <Image Source="Fish\diver.png" Height="9" Width="9" />
        </Button>
        </WrapPanel>
        </StackPanel>
        <StackPanel Margin="0,161,0,0" Grid.RowSpan="2">
            <TreeView x:Name="treeViewBlue" Grid.Row="1" Foreground="Blue" Background="{StaticResource ButtonBrushOrange}" ItemsSource="{Binding Source={StaticResource BlueDataProvider}, XPath=.}" >
            </TreeView>
        </StackPanel>
        <StackPanel Name="ListStackPanel" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="0" Grid.RowSpan="2" Grid.Column="2" Grid.ColumnSpan="1" >
            <ListBox x:Name="fishBox" BorderThickness="0" BorderBrush="Transparent" Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" 
                     ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                     ItemsSource="{Binding Source={StaticResource FishBooksData}}" >
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapPanel Background="Orange"  />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="55" />
                                <RowDefinition/>
                                <RowDefinition/>
                            </Grid.RowDefinitions>
                            <Image Source="{Binding Path=FullPath}" Height="35" />
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </StackPanel>
    </Grid>
</Window>

           
         

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

Hall of Fame

1. chinu1310115,524
2. peterdungan96,130
3. unmeshdave79,975
4. jaime_oliv...56,858
5. apeter33,500
6. TSmooth32,450
7. CuteBug31,450
8. gauthampj20,785
9. neder16,400
10. ToddBeau...15,664
11. feddas14,740
12. TheLearn...13,000
13. VBRocks12,064
14. CodeCruiser11,300
15. apb29,750
16. ragbn9,400
17. TommyTw...9,150
18. nmarun8,200
19. emoreau8,060
20. tovvenki7,700
21. Idle_Mind7,500
22. rendaduiyan6,000
22. tetorvik6,000
24. Fernando...5,500
25. jarnsater5,350

1. chinu1310115,524
2. peterdungan102,130
3. adler7791,410
4. unmeshdave79,975
5. jaime_oliv...62,658
6. TSmooth35,650
7. apeter33,500
8. CuteBug32,450
9. gauthampj22,785
10. apb220,700
11. Fernando...17,000
12. neder16,400
13. ToddBeau...15,664
14. TheLearn...15,000
15. feddas14,740
16. VBRocks12,064
17. Idle_Mind11,500
18. CodeCruiser11,300
19. emoreau10,560
20. ragbn9,400
21. TommyTw...9,150
22. nmarun8,200
23. Dhaest7,840
24. tovvenki7,700
25. matrixnz7,000

Observable Collection Not Dispalying in WPF Listbox

Asked by cardinalone in WPF and Silverlight

About this solution