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A Pluggable Architecture for Building Silverlight Applications with MVVM

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6 Jul 2011CPOL7 min read 145.8K   2.2K   90  
This article describes building a sample Silverlight application with the MVVM Light toolkit, WCF RIA Services, and a pluggable application architecture using MEF.
 
<UserControl x:Class="IssueVision.Client.AuditIssue"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
    xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.SL4"
    xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
    xmlns:common="clr-namespace:IssueVision.Common;assembly=IssueVision.Common"
    Loaded="UserControl_Loaded" Unloaded="UserControl_Unloaded"
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">

    <Grid x:Name="LayoutRoot"
          common:DefaultButtonHelper.DefaultButton="{Binding ElementName=auditButton}">
        <Grid.RowDefinitions>
            <RowDefinition Height="1*" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="4*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <data:DataGrid x:Name="dataGrid_IssueHistory" Grid.Row="0" Grid.Column="0"
                       AutoGenerateColumns="False"
                       ItemsSource="{Binding Path=IssueHistorySource.View}"
                       SelectionMode="Single" IsReadOnly="True">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="SelectionChanged">
                    <cmd:EventToCommand PassEventArgsToCommand="True"
                                        Command="{Binding Path=SelectionChangedCommand}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
            <data:DataGrid.Columns>
                <data:DataGridTextColumn Header="ID" Binding="{Binding IssueID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" Width="35" />
                <data:DataGridTextColumn Header="Action" Binding="{Binding Action, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" Width="*" />
                <data:DataGridTextColumn Header="Time Stamp" Binding="{Binding DateCreated, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" Width="4*" />
                <data:DataGridTextColumn Header="Status" Binding="{Binding Status.Name, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" Width="*" />
                <data:DataGridTextColumn Header="Pri" Binding="{Binding Priority, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" Width="35" />
                <data:DataGridTextColumn Header="Assigned To" Binding="{Binding AssignedToID, Mode=OneWay, TargetNullValue=Open, ValidatesOnNotifyDataErrors=False}" Width="70" />
            </data:DataGrid.Columns>
        </data:DataGrid>
        <controls:GridSplitter Grid.Row="1" Grid.Column="0"
                               Height="14" HorizontalAlignment="Stretch"/>
        <Grid x:Name="grid_IssueHistoryItem" Grid.Row="2" Grid.Column="0">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="326*" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="295*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="600*" />
                <ColumnDefinition Width="94*" />
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Row="0" Grid.Column="0"
                   HorizontalAlignment="Stretch" VerticalAlignment="Center"
                   Margin="4" Text="Issue Title" />
            <TextBox x:Name="textBox_IssueTitle" Grid.Row="0" Grid.Column="1"
                 VerticalAlignment="Center" IsReadOnly="True"
                 Text="{Binding Path=IssueHistoryItem.Title, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
            <Border Grid.Row="0" Grid.Column="2"
                BorderBrush="Silver" BorderThickness="1"
                CornerRadius="3" Margin="5">
                <StackPanel>
                    <TextBlock HorizontalAlignment="Center" Text="Issue ID" />
                    <TextBlock HorizontalAlignment="Center"
                           Text="{Binding Path=IssueHistoryItem.IssueID, Mode=OneWay, TargetNullValue='None', ValidatesOnNotifyDataErrors=False}" />
                </StackPanel>
            </Border>
            <ScrollViewer Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="34*" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Row="0" Grid.Column="0"
                               FontWeight="Bold" Margin="4" 
                               Text="Issue Info" />
                    <TextBlock Grid.Row="1" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Type" />
                    <ComboBox x:Name="comboBox_Type" Grid.Row="1" Grid.Column="1" 
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=IssueTypeEntries}"
                              DisplayMemberPath="Name"
                              SelectedValuePath="IssueTypeID"
                              SelectedValue="{Binding Path=IssueHistoryItem.IssueTypeID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="2" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Priority" />
                    <ComboBox x:Name="comboBox_Priority" Grid.Row="2" Grid.Column="1"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=PriorityEntries}"
                              SelectedItem="{Binding Path=IssueHistoryItem.Priority, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="3" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Severity" />
                    <ComboBox x:Name="comboBox_Severity" Grid.Row="3" Grid.Column="1"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=SeverityEntries}"
                              SelectedItem="{Binding Path=IssueHistoryItem.Severity, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="4" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Status" />
                    <ComboBox x:Name="comboBox_Status" Grid.Row="4" Grid.Column="1"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=StatusEntries}"
                              DisplayMemberPath="Name"
                              SelectedValuePath="StatusID"
                              SelectedValue="{Binding Path=IssueHistoryItem.StatusID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}"/>
                    <TextBlock Grid.Row="5" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Substatus" />
                    <ComboBox x:Name="comboBox_Substatus" Grid.Row="5" Grid.Column="1"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=SubstatusEntriesWithNull}"
                              DisplayMemberPath="DisplayName"
                              SelectedValuePath="SubStatusID2"
                              SelectedValue="{Binding Path=IssueHistoryItem.SubStatusID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="6" Grid.Column="0"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Platform" />
                    <data:DataGrid x:Name="dataGrid_Platform" Grid.Row="6" Grid.Column="1" Grid.RowSpan="3"
                                   VerticalAlignment="Top" Height="60" Margin="4"
                                    IsHitTestVisible="False" IsTabStop="False"
                                    ColumnWidth="Auto" AutoGenerateColumns="False" 
                                    SelectionMode="Single"
                                    ItemsSource="{Binding Path=PlatformEntries, Mode=OneWay}">
                        <data:DataGrid.Columns>
                            <data:DataGridTemplateColumn Header="Operating System" Width="Auto" SortMemberPath="OSVersion">
                                <data:DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                            <TextBlock Text="{Binding OS, ValidatesOnNotifyDataErrors=False}" />
                                            <TextBlock Text=" " />
                                            <TextBlock Text="{Binding OSVersion, ValidatesOnNotifyDataErrors=False}" />
                                            <TextBlock Text=" (" />
                                            <TextBlock Text="{Binding Processor, ValidatesOnNotifyDataErrors=False}" />
                                            <TextBlock Text=")" />
                                        </StackPanel>
                                    </DataTemplate>
                                </data:DataGridTemplateColumn.CellTemplate>
                            </data:DataGridTemplateColumn>
                            <data:DataGridTemplateColumn Header="Browser" Width="Auto" SortMemberPath="BrowserVersion">
                                <data:DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                            <TextBlock Text="{Binding Browser, ValidatesOnNotifyDataErrors=False}" />
                                            <TextBlock Text=" " />
                                            <TextBlock Text="{Binding BrowserVersion, ValidatesOnNotifyDataErrors=False}" />
                                        </StackPanel>
                                    </DataTemplate>
                                </data:DataGridTemplateColumn.CellTemplate>
                            </data:DataGridTemplateColumn>
                            <data:DataGridTextColumn Header="Language" Width="*" Binding="{Binding Language, ValidatesOnNotifyDataErrors=False}" />
                        </data:DataGrid.Columns>
                    </data:DataGrid>
                    <TextBlock Grid.Row="1" Grid.Column="2"
                               VerticalAlignment="Center" Margin="4" 
                               Text="Opened"/>
                    <TextBox Grid.Row="1" Grid.Column="3"
                             Margin="4" IsReadOnly="True"
                             Text="{Binding Path=IssueHistoryItem.OpenedDate, Mode=OneWay, StringFormat=\{0:F\}, ValidatesOnNotifyDataErrors=False}"/>
                    <TextBlock Grid.Row="2" Grid.Column="2"
                           VerticalAlignment="Center" Margin="4" 
                           Text="Opened By" />
                    <TextBox Grid.Row="2" Grid.Column="3"
                             Margin="4" MinHeight="25" IsReadOnly="True"
                             Text="{Binding Path=IssueHistoryItem.OpenedByID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}"/>
                    <TextBlock Grid.Row="3" Grid.Column="2"
                             VerticalAlignment="Center" Margin="4" 
                             Text="Changed" />
                    <TextBox Grid.Row="3" Grid.Column="3"
                             Margin="4" IsReadOnly="True" 
                             Text="{Binding Path=IssueHistoryItem.LastChange, StringFormat=\{0:F\}, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="4" Grid.Column="2"
                             VerticalAlignment="Center" Margin="4" 
                             Text="Changed By" />
                    <TextBox Grid.Row="4" Grid.Column="3"
                             Margin="4" MinHeight="25" IsReadOnly="True"
                             Text="{Binding Path=IssueHistoryItem.ChangedByID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}"/>
                    <TextBlock Grid.Row="5" Grid.Column="2"
                             VerticalAlignment="Center" Margin="4" 
                             Text="Assigned To" />
                    <ComboBox x:Name="comboBox_AssignedTo" Grid.Row="5" Grid.Column="3"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=UserEntriesWithNull}"
                              DisplayMemberPath="DisplayName"
                              SelectedValuePath="Name"
                              SelectedValue="{Binding Path=IssueHistoryItem.AssignedToID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="6" Grid.Column="2"
                              VerticalAlignment="Center" Margin="4" 
                              Text="Resolution" />
                    <ComboBox x:Name="comboBox_Resolution" Grid.Row="6" Grid.Column="3"
                              Margin="4" MinHeight="25"
                              IsHitTestVisible="False" IsTabStop="False"
                              ItemsSource="{Binding Path=ResolutionEntriesWithNull}"
                              DisplayMemberPath="DisplayName"
                              SelectedValuePath="ResolutionID2"
                              SelectedValue="{Binding Path=IssueHistoryItem.ResolutionID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" />
                    <TextBlock Grid.Row="7" Grid.Column="2"
                              VerticalAlignment="Center" Margin="4" 
                              Text="Resolved By" />
                    <TextBox Grid.Row="7" Grid.Column="3"
                              Margin="4" MinHeight="25" IsReadOnly="True"
                              Text="{Binding Path=IssueHistoryItem.ResolvedByID, Mode=OneWay, ValidatesOnNotifyDataErrors=False}"/>
                </Grid>
            </ScrollViewer>
            <controls:GridSplitter Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="3"
                               HorizontalAlignment="Stretch" />
            <controls:TabControl Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="3">
                <controls:TabItem Header="Details">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="164*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Row="0" Grid.Column="0"
                               Text="Description" />
                        <TextBox x:Name="textBox_Description" Grid.Row="1" Grid.Column="0"
                             AcceptsReturn="True" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap"
                             Text="{Binding Path=IssueHistoryItem.Description, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" IsReadOnly="True" />
                        <controls:GridSplitter Grid.Row="0" Grid.Column="1"  Grid.RowSpan="2"
                                           HorizontalAlignment="Stretch"/>
                        <TextBlock Grid.Row="0" Grid.Column="2"
                               Text="Repro Steps" />
                        <TextBox x:Name="textBox_ReproSteps" Grid.Row="1" Grid.Column="2"
                             AcceptsReturn="True" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap" 
                             Text="{Binding Path=IssueHistoryItem.ReproSteps, Mode=OneWay, ValidatesOnNotifyDataErrors=False}" IsReadOnly="True" />
                    </Grid>
                </controls:TabItem>
            </controls:TabControl>
        </Grid>
        <TextBlock Grid.Row="3" Grid.Column="0"
                   VerticalAlignment="Center" HorizontalAlignment="Right"
                   Margin="0,5,167,5" Text="Issue ID :" />
        <TextBox Grid.Row="3" Grid.Column="0"
                   VerticalAlignment="Center" HorizontalAlignment="Right"
                   Width="75" Height="23" Margin="0,5,86,5" 
                   Text="{Binding Path=CurrentIssueID, Mode=TwoWay}"/>
        <Button x:Name="auditButton" Grid.Row="3" Grid.Column="0"
                   VerticalAlignment="Center" HorizontalAlignment="Right"
                   Width="75" Height="23" Margin="0,5,5,5"
                   Content="Audit"
                   Command="{Binding Path=AuditIssueCommand}"/>
    </Grid>
</UserControl>

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Weidong Shen
Software Developer (Senior)
United States United States
Weidong has been an information system professional since 1990. He has a Master's degree in Computer Science, and is currently a MCSD .NET

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Posted 20 Aug 2010

Article Copyright 2010 by Weidong Shen
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