RIA Services之商业应用----4 Custom DataForm&ChangeTheme

1.        Custom Dataform用来新增一条记录。

前面那篇文章已经提到使用自定义DataForm来新增记录。可能你会觉得自定义DataForm干嘛，直接使用TextBlock和TextBox就行。

自定义一个Dataform可以让数据的验证更容易的实现。

A.       先定义一个Customrestaurant类，它继承了那面这两个接口。

 

下面那么多属性就是我们需要填写的所有字段。

然后我们添加一个验证规则是Name字段必须不为空且大于4个字符串。

    public string this[string columnName]

        {

            get

            {

                string result = null;

 

                if (columnName == "Name")

                {

                    if (String.IsNullOrEmpty(Name))

                        result = "Firstname has to be set!";

                    else if (Name.Length < 3)

                        result = "Firstname's length has to be at least 5 characters!";

                }

              

 

                return result;

          

 

 

B.       创建一个自定义控件，它的结构如下：

 

这里使用了两个DependencyProperty,第一个是是否编辑，第二个是让TheRestaurant作为它的一个属性。

我们这里使用Resource Dictionary来存放模板信息：

 

定义DataForm的模板如下：

< Style  targettype ="local:CusRestuarantDataForm">

         < Setter  Property ="Template">

             < Setter.Value >

                 < ControlTemplate  targettype ="local:CusRestuarantDataForm">

                     < Border  Background ="{ TemplateBinding  Background }"

                            BorderBrush="{TemplateBinding BorderBrush}"

                            BorderThickness="{TemplateBinding BorderThickness}"

                            CornerRadius="3" Width="{TemplateBinding Width}">

                         < 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 ="Auto"/>

                               

                             </ Grid.RowDeFinitions >

                             < Grid.ColumnDeFinitions >

                                 < ColumnDeFinition  Width ="150"/>

                                 < ColumnDeFinition  Width ="*"/>

                             </ Grid.ColumnDeFinitions >

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="0"

                    Text="Address:" Style="{StaticResource tb}" />

                             < TextBox  Grid.Column ="1"  Grid.Row ="0"                            x:Name="tAddress" Style="{StaticResource tx}"

    Text="{Binding Path=TheRestaurant.Address, Mode=TwoWay, ValidatesOnDataErrors=True}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="1"

                    Text="Code:" Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="1"                            x:Name="tCode" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.Code, ValidatesOnDataErrors=True}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="2"                              Text="ContactName:" Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="2"                            x:Name="tContactName" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.ContactName, Mode=TwoWay}" IsReadOnly="{Binding IsLocked}" />

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="3"  Text ="ContactTitle:"                     Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="3"                            x:Name="tContactTitle" Style="{StaticResource tx}"

                                Text="{Binding Path=TheRestaurant.ContactTitle,  TargetNullValue=Doctor}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="4"

                    Text="Fax:" Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="4"                            x:Name="tFax" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.Fax, Mode=TwoWay}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="5"                              Text="ID:" Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="5"                            x:Name="tID" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.ID, Mode=TwoWay}"                                     

                                 AcceptsReturn="True" textwrapping="Wrap" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="6"                              Text="Name:" Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="6"                            x:Name="tName" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.Name,  ValidatesOnDataErrors=True}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="7"  Text ="Phone:"                    Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="7"                            x:Name="tPhone" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.Phone,  ValidatesOnDataErrors=True}" IsReadOnly="{Binding IsLocked}"/>

 

                             < TextBlock  Grid.Column ="0"  Grid.Row ="8"                              Text="Region:"

                        Style="{StaticResource tb}"/>

                             < TextBox  Grid.Column ="1"  Grid.Row ="8"                            x:Name="tRegion" Style="{StaticResource tx}"

                                 Text="{Binding Path=TheRestaurant.Region, TargetNullValue=Beijing, ValidatesOnDataErrors=True}" IsReadOnly="{Binding IsLocked}"/>

                          

                         </ Grid >

                     </ Border >

                 </ ControlTemplate >

             </ Setter.Value >

         </ Setter >

     </ Style >

 

因为这个是自定义Dataform我们还可以使用数据绑定功能来让此DataForm作为查看每条记录的容器，只需要绑定RIA Service的数据源。

先说如何新增记录吧

需要创建一个子窗体。

 

在Home.xaml页面添加一个Add Record按钮：

 

Click事件如下：

  NewRestuarant cw = new NewRestuarant();

            CusRestuarantDataForm custDataform = new CusRestuarantDataForm();

            custDataform.Margin = new Thickness(3);

            custDataform.Width = 450;

            custDataform.TheRestaurant = new Customrstaurant();

            custDataform.IsLocked = false;

 

            cw.LayoutRoot.Children.Add(custDataform);

            cw.HasCloseButton = false;

            cw.Title = "New Restuarant Detail";

            cw.Closed += (s,args) =>

                {

                    if (cw.DialogResult.Value && custDataform.IsValid)

                    {

                      

                    }

                };

            cw.Closing += (s,args) =>

                {

                    if (!custDataform.IsValid && cw.DialogResult.Value)

                    {

                        MessageBox.Show("Some of field values are not valid.");

                        args.Cancel = true;

                    }

                };

            cw.Show();

           运行一下，

     

   最后一步是如何使用RIA Service更新数据源了。

在Closed事件发生后加入如下代码：

 

2.        使用SilverlightControlToolkit中的皮肤。

这里需要使用到ICommand方法。

先创建一个Class：

public  class ThemeChangeCommand :ICommand

    {

 

        public bool CanExecute(object parameter)

        {

            return true;

        }

 

        public event EventHandler CanExecuteChanged;

 

        public void Execute(object parameter)

        {

            Theme themeContainer = (Theme)((FrameworkElement)((ContentControl)Application.Current.RootVisual).Content).FindName("ThemeContainer");

            string themeName = parameter as string;

 

            if (themeName == null)

            {

                themeContainer.ThemeUri = null;

            }

            else

            {

                themeContainer.ThemeUri =new  Uri("/System.Windows.Controls.Theming." + themeName + ";component/Theme.xaml", UriKind.RelativeOrAbsolute);

            }

 

            if (CanExecuteChanged != null)

                CanExecuteChanged(this, new EventArgs());

        }

    }

 

第二步我们需要在APP.xaml中添加如下一句话：

    < helper : ThemeChangeCommand  x : Key ="themeCommand" />

 

最后就是修改MainPage.xaml中的Contentborder部分。

 

 

运行一下：

 

右键鼠标就能看到不同的皮肤了。选择个黑色的试试：

 

前提是你安装了最新的Silverlight Toolkit。