R – In Silverlight, what is the best way to convert between a System.Drawing.Color and a System.Windows.Media.Color

silverlight

I'm trying to convert from a System.Drawing.Color to a Silverlight System.Windows.Media.Color. I'm actually trying to pass this color through a service.

The System.Drawing.Color, passed over the wire, does not serialize the argb value independently.

I can convert the argb value to a 32-bit int

[DataMember]  
public int MyColor { get { return Color.Red.ToArgb(); } set {} }

But I don't see any corresponding method in System.Windows.Media.Color to convert that back.

What is the best way to do this?

Best Solution

The 32-bit representation of System.Drawing.Color assumes a set byte-ordering (e.g ARGB) and that each channel is represented by 8-bits.

Silverlight does not make these assumptions. Instead Media.Color is stored as four 32-bit floating point values and the ordering is based on the color profile.

To create a Media.Color value from a System.Drawing.Color you should use the FromArgb / FromRgb methods and pass in the four separate components.

If necessary You could get these components by AND'ing out the components from the combined 32-bit value. You know (or can find out) the order of the bytes in this color value, which is knowledge that Silverlight does not have.

Related Solutions

R – How to configure a get-only property for a Silverlight-enabled WCF service

In your example PropertyB is not marked with a DataMember attribute meaning that it won't be exposed in the WSDL and ignored by the serializer. But if you mark PropertyB with a DataMember then you must have a setter (private, proptected or public) in order to serialize it correctly otherwise you may get an exception. There are two ways I can think of having read-only properties serialized over the wire:

[DataContract]
public class SomeClass
{ 
    public SomeClass()
    {
        _propertyB = "Hi there";
    }

    [DataMember(Name="PropertyB")]
    private readonly string _propertyB;

    public string PropertyB
    {
        get { return _propertyB; }
    }
}

Or this:

[DataContract]
public class SomeClass
{ 
    public SomeClass()
    {
        PorpertyB = "Hi there";
    }

    [DataMember]
    public string PropertyB
    {
        get;
        private set;
    }
}

Please note that if you use svcutil.exe, the generated proxy class will have both public getter and setter for the property which might not be what you are looking for. In this case you can use the service contract and data contract assemblies on the client side.

R – the best way to display a grid of a large number of items in Silverlight

I can think only a simple two level ItemsControl(ListBox) solution for this. And the inner visual element can be a Styled CheckBox to look like 'O' or 'X' here is the sample I just made for you . Of course you do need to a DateHeader collection at the top aligned with the checkboxes.

alt text http://img339.imageshack.us/img339/8695/grid.jpg

XAML

    <UserControl.Resources>
    <DataTemplate x:Key="CellTemplate">
        <Grid Width="25" Height="25">
            <CheckBox IsChecked="{Binding IsPresent}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
        </Grid>
    </DataTemplate>
    <DataTemplate x:Key="RowTemplate">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="80"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <TextBlock Margin="4,0,0,0" Text="{Binding Name}" TextWrapping="Wrap"/>
            <ItemsControl ItemsSource="{Binding WorkingDays}" HorizontalAlignment="Left" VerticalAlignment="Top" ItemTemplate="{StaticResource CellTemplate}" Grid.Column="1" >
                <ItemsControl.ItemsPanel>   
                    <ItemsPanelTemplate>
                        <StackPanel Orientation="Horizontal"/>      
                    </ItemsPanelTemplate>               
                </ItemsControl.ItemsPanel>
            </ItemsControl>
        </Grid>
    </DataTemplate>
</UserControl.Resources>
<ItemsControl x:Name="lstWorkingDaysMain" ItemsSource="{Binding}" ItemTemplate="{StaticResource RowTemplate}" >
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <StackPanel Orientation="Vertical"/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
</ItemsControl>

public class Student
{
    public Student()
    {
        WorkingDays = new List<WorkingDay>();
    }

    public string Name { get; set; }
    public List<WorkingDay> WorkingDays { get; set; }
}

public class WorkingDay
{
    public bool IsPresent{get; set;}
    public DateTime Date { get; set; }
}

And the test data population at the code behind xaml.cs

 List<Student> students = new List<Student>();

        Student student = new Student() { Name = "Aaaaaa" };
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,5), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,6), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,7), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,8), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,9), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,10), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,11), IsPresent=true} );
        student.WorkingDays.Add(new WorkingDay() { Date=new DateTime(2009,5,12), IsPresent=true} );
        students.Add(student);

        student = new Student() { Name = "Bbbbbb" };
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 5), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 6), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 7), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 8), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 9), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 10), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 11), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 12), IsPresent = true });
        students.Add(student);


        student = new Student() { Name = "Cccccc" };
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 5), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 6), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 7), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 8), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 9), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 10), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 11), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 12), IsPresent = false });
        students.Add(student);


        student = new Student() { Name = "Dddddd" };
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 5), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 6), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 7), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 8), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 9), IsPresent = false });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 10), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 11), IsPresent = true });
        student.WorkingDays.Add(new WorkingDay() { Date = new DateTime(2009, 5, 12), IsPresent = true });
        students.Add(student);

        this.DataContext = students;

Best Solution

Related Solutions

R – How to configure a get-only property for a Silverlight-enabled WCF service

R – the best way to display a grid of a large number of items in Silverlight

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