如何使用Expression Blend编辑在Visual Studio中创建的DataTemplate？

Question

对于那些在实际项目中使用Expression Blend和Visual Studio的人,请帮助我了解如何在日常开发/设计任务中使用Blend和Visual Studio,这是一个真实的场景:

我在Visual Studio中创建了以下简单的WPF应用程序.它显示了一个带有DataTemplate的客户对象列表,该对象以简单的橙色框显示客户.

我现在想通过使用Expression Blend 将一些pizazz放入这个DataTemplate中.

我在Expression Blend中打开这个项目,以为我会看到橙色的盒子,我可以改变它的颜色,在鼠标悬停时创建动画,调整大小等等.但是,我在Expression Blend中看到的只是一个完全空白的盒子.

所以我理解:

• Expression Blend 似乎无法理解我的数据来自ViewModel,因此不会显示它.这是Blend的限制还是我需要以某种方式更改我的代码,以便Blend可以解释在运行时会出现什么数据？
• 我正在使用具有"样本数据"功能的Expression Blend 3.使用此示例数据功能的最佳方法是什么,即使它无法解释C#并了解将从ViewModel属性中填充Listbox的哪些数据,我怎样才能使它至少产生一些虚拟数据,以便我可以操纵DataTemplate？

XAML:

<Window x:Class="TestStringFormat234.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <DataTemplate x:Key="DataTemplateCustomers">
            <Border CornerRadius="5" Background="Orange" Padding="5" Margin="3">
                <StackPanel Orientation="Horizontal">
                    <TextBlock>
                    <TextBlock.Text>
                        <MultiBinding StringFormat="{}{0} {1} (hired on {2:MMM dd, yyyy})">
                            <Binding Path="FirstName"/>
                            <Binding Path="LastName"/>
                            <Binding Path="HireDate"/>
                        </MultiBinding>
                    </TextBlock.Text>
                    </TextBlock>
                </StackPanel>
            </Border>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <ListBox ItemsSource="{Binding GetAllCustomers}"
                 ItemTemplate="{StaticResource DataTemplateCustomers}">
        </ListBox>
    </Grid>
</Window>

代码背后:

using System.Windows;
using System.Collections.ObjectModel;
using System;

namespace TestStringFormat234
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            DataContext = new CustomerViewModel();
        }
    }

    //view model
    public class CustomerViewModel
    {
        public ObservableCollection<Customer> GetAllCustomers {
            get {
                ObservableCollection<Customer> customers = new ObservableCollection<Customer>();
                customers.Add(new Customer { FirstName = "Jim", LastName = "Smith", HireDate = DateTime.Parse("2007-12-31") });
                customers.Add(new Customer { FirstName = "Jack", LastName = "Jones", HireDate = DateTime.Parse("2005-12-31") });
                return customers;
            }
        }
    }

    //model
    public class Customer
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime HireDate { get; set; }
    }
}

Answer 1

我只是想出来,所以请允许我回答我自己的问题.

我阅读了Laurent的Bugnion文章,并且发现我只需要调整上面的代码,这样我就可以在Expression Blend GUI中看到我的ViewModel中的数据,并且能够在Blend中编辑DataTemplate,保存它,以及然后继续在Visual Studio中编辑.

基本上改变是:(1)从代码后面取出DataContext语句,(2)在XAML中添加"本地"命名空间,(3)在XAML中定义本地数据提供者("TheDataProvider"),(4)绑定到它直接来自ListBox.

以下是完全适用于Expression Blend和Visual Studio的代码:

XAML:

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:TestStringFormat234"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" x:Name="window" x:Class="TestStringFormat234.Window1"
    Title="Window1" Height="300" Width="300" mc:Ignorable="d">
    <Window.Resources>
        <local:CustomerViewModel x:Key="TheDataProvider"/>

        <DataTemplate x:Key="DataTemplateCustomers">
            <Border CornerRadius="5" Padding="5" Margin="3">
                <Border.Background>
                    <LinearGradientBrush EndPoint="1.007,0.463" StartPoint="-0.011,0.519">
                        <GradientStop Color="#FFF4EEEE" Offset="0"/>
                        <GradientStop Color="#FFA1B0E2" Offset="1"/>
                    </LinearGradientBrush>
                </Border.Background>
                <StackPanel Orientation="Horizontal">
                    <TextBlock>
                    <TextBlock.Text>
                        <MultiBinding StringFormat="{}{0} {1} (hired on {2:MMM dd, yyyy})">
                            <Binding Path="FirstName"/>
                            <Binding Path="LastName"/>
                            <Binding Path="HireDate"/>
                        </MultiBinding>
                    </TextBlock.Text>
                    </TextBlock>
                </StackPanel>
            </Border>
        </DataTemplate>
    </Window.Resources>
    <Grid >
        <ListBox 
            ItemsSource="{Binding Path=GetAllCustomers, Source={StaticResource TheDataProvider}}"
            ItemTemplate="{StaticResource DataTemplateCustomers}" />
    </Grid>
</Window>

代码背后:

using System.Windows;
using System.Collections.ObjectModel;
using System;

namespace TestStringFormat234
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }

    //view model
    public class CustomerViewModel
    {
        public ObservableCollection<Customer> GetAllCustomers {
            get {
                ObservableCollection<Customer> customers = new ObservableCollection<Customer>();
                customers.Add(new Customer { FirstName = "Jim", LastName = "Smith", HireDate = DateTime.Parse("2007-12-31") });
                customers.Add(new Customer { FirstName = "Jack", LastName = "Jones", HireDate = DateTime.Parse("2005-12-31") });
                return customers;
            }
        }
    }

    //model
    public class Customer
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime HireDate { get; set; }
    }
}