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GridViewImageColumn problem

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Imran Aliyev
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Imran Aliyev asked on 23 Apr 2010, 06:54 AM

I am using Telerik RadGridView in my project. I want to show image in column.

                GridViewImageColumn col1 = new GridViewImageColumn();
                col1.Width = 100;
                col1.DataMemberBinding = new Binding("id");
                col1.Header = "PhotoByConverter";
                col1.DataMemberBinding.Converter = new ThumbnailConverter();
                grid.Columns.Add(col1);
                GridViewDataColumn col2 = new GridViewDataColumn();
                col2.Width = 100;
                col2.DataMemberBinding = new Binding("firstName");
                col2.Header = "Person name";
               
                grid.Columns.Add(col2);
                Grid.ItemsSource=DataTable; 
First column not wokrs but second works fine. I use Converter for image shown below

    public class ThumbnailConverter : IValueConverter
    {
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
                    IEnumerable<thumbNail> result = from n in thumbnails
                                        where n.personID == value.ToString()
                                        select n;
        if (result != null && result.First().thumbnail != null)
        {
            return result.First().thumbnail.file;
        }
        else
        {
            return null;
        }
    }
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new Exception("The method or operation is not implemented.");
    }
   } 

I found by id thumbnail of person and set it like data for GridViewImageColumn. I checked with Debuger conveter works properly. I can't undesrtand why it doesn't work. Any ideas?

I use 2009 Q3 version.

My converter returns byte[] type

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Imran Aliyev
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answered on 23 Apr 2010, 11:03 AM

İ investigate this problem and found out that with class collection everything works properly, but when I use DataTable image column doesn't work. 

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Vlad
Telerik team
answered on 26 Apr 2010, 09:14 AM
Hi,

Do you have any invalid bindings in the Visual Studio output window?

Sincerely yours,
Vlad
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Imran Aliyev
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answered on 26 Apr 2010, 09:27 AM

I create a simple project with simple code. This code not works. Name column bound fine, but Image column doesnt work

            FileStream fs = new FileStream("c:/temp/pic.jpeg", FileMode.Open, FileAccess.Read);  
            BinaryReader br = new BinaryReader(fs);  
            byte[] pic = br.ReadBytes((int)fs.Length);  
 
            DataTable dt = new DataTable();  
            dt.Columns.Add("id");  
            dt.Columns.Add("Image");  
            dt.Columns.Add("Name");  
 
            dt.Rows.Add("1", pic, "Imran");  
            dt.Rows.Add("2", pic, "Emin");  
 
            MyGrid.ItemsSource=dt; 

and my XAML:

<Window x:Class="WpfApplication3.Window1"  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
    Title="Window1" Height="400" Width="700" Loaded="Window_Loaded"  
        xmlns:local="clr-namespace:WpfApplication3"  
        xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView">  
    <Grid>  
        <telerik:RadGridView AutoGenerateColumns="False" x:Name="MyGrid" >  
            <telerik:RadGridView.Columns>  
 
                <telerik:GridViewImageColumn Header="Image" DataMemberBinding="{Binding Image}" />  
                <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}" Width="150" Header="Name"/>  
                         
            </telerik:RadGridView.Columns>  
        </telerik:RadGridView>  
    </Grid>  
</Window> 

 Yes I have in my output windows next errors:

System.Windows.Data Error: 39 : BindingExpression path error: 'Image' property not found on 'object' ''DataRow' (HashCode=33813864)'. BindingExpression:Path=Image; DataItem='DataRow' (HashCode=33813864); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')

What does it mean?

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Vlad
Telerik team
answered on 26 Apr 2010, 09:30 AM
Hi,

You can try DataMemberBinding="{Binding [Image]}" instead.

Regards,
Vlad
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Imran Aliyev
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answered on 26 Apr 2010, 09:33 AM
Thank you very much Vlad. It works!!!
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Vlad
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