Silverlight+RIA Service Required验证失效问题的解决方案
Silverlight+RIA Service当我们给一个Model添加[Required]特性的时候，想必一定是要在内容Save之前进行不能为空的验证。
但是这个验证是基于PropertyChanged的，如果我们不修改内容，而直接提交窗口内容，那么由于没有产生PropertyChanged，所以原先的验证就不会被执行。
示例窗口：
1 <UserControl x:Class="SilverlightTest.MainPage"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
5 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
6 xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"
7 mc:Ignorable="d"
8 d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded">
9
10 <Grid x:Name="LayoutRoot" Background="White">
11 <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
12 <dataInput:ValidationSummary x:Name="vs" Visibility="Visible"></dataInput:ValidationSummary>
13 <StackPanel Orientation="Horizontal" Margin="5">
14 <TextBlock Text="User Name" Width="100"></TextBlock>
15 <TextBox x:Name="tbUserName" Width="150" Text="{Binding UserName, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}"></TextBox>
16 </StackPanel>
17 <StackPanel Orientation="Horizontal" Margin="5">
18 <TextBlock Text="User Address" Width="100"></TextBlock>
19 <TextBox x:Name="tbUserAddress" Text="{Binding UserAddress,Mode=TwoWay}" Width="150"></TextBox>
20 </StackPanel>
21 <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
22 <Button x:Name="btSave" Content="Save" Width="80" Margin="5" Click="btSave_Click"></Button>
23 <Button x:Name="btCancel" Content="Cancel" Width="80" Margin="5"></Button>
24 </StackPanel>
25 </StackPanel>
26 </Grid>
27 </UserControl>
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2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
5 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
6 xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"
7 mc:Ignorable="d"
8 d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded">
9
10 <Grid x:Name="LayoutRoot" Background="White">
11 <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
12 <dataInput:ValidationSummary x:Name="vs" Visibility="Visible"></dataInput:ValidationSummary>
13 <StackPanel Orientation="Horizontal" Margin="5">
14 <TextBlock Text="User Name" Width="100"></TextBlock>
15 <TextBox x:Name="tbUserName" Width="150" Text="{Binding UserName, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}"></TextBox>
16 </StackPanel>
17 <StackPanel Orientation="Horizontal" Margin="5">
18 <TextBlock Text="User Address" Width="100"></TextBlock>
19 <TextBox x:Name="tbUserAddress" Text="{Binding UserAddress,Mode=TwoWay}" Width="150"></TextBox>
20 </StackPanel>
21 <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
22 <Button x:Name="btSave" Content="Save" Width="80" Margin="5" Click="btSave_Click"></Button>
23 <Button x:Name="btCancel" Content="Cancel" Width="80" Margin="5"></Button>
24 </StackPanel>
25 </StackPanel>
26 </Grid>
27 </UserControl>
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