wpf - WPF 中设计时数据的问题

Question

嗨，我尝试在 wpf 中使用我的第一个设计时数据。我使用以下教程:

http://karlshifflett.wordpress.com/2009/10/21/visual-studio-2010-beta2-sample-data-project-templates/

http://karlshifflett.wordpress.com/2009/10/28/ddesigninstance-ddesigndata-in-visual-studio-2010-beta2/

我创建了简单的数据类，如下:

public class Avatar:INotifyPropertyChanged
    {
        private string _name;
        private string _surname;

        public string Name
        {
            get { return _name; }
            set
            {
                _name = value;
                NotifyPropertyChanged("Name");
            }
        }

        public string Surname
        {
            get { return _surname; }
            set
            {
                _surname = value;
                NotifyPropertyChanged("Surname");
            }
        }


        public new event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }

    }

然后我创建了示例数据:

<TestForDesignTimeData:Avatar xmlns:TestForDesignTimeData="clr-namespace:TestForDesignTimeData" Name="John" Surname="Smith"/>

并尝试在 wpf 窗口中使用设计时数据:

<Window x:Class="TestForDesignTimeData.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:TestForDesignTimeData="clr-namespace:TestForDesignTimeData"
        mc:Ignorable="d" 
        Title="MainWindow" Height="350" Width="525">

        <StackPanel d:DataContext="{d:DesignInstance TestForDesignTimeData:Avatar}">
            <TextBlock Background="Yellow" Height="40" Width="250"   Text="{Binding Path=Name}"/>
            <TextBlock Background="Yellow" Height="40" Width="250"   Text="{Binding Path=Surname}"/>
    </StackPanel>
</Window>

但我在设计器中看到空文本框。我做错了什么？

Answer 1

您需要从 Avatar 创建一个将在设计时使用的派生类，并在此类的构造函数中定义示例数据:

public class AvatarDesignTime : Avatar
{
   public AvatarDesignTime()
   {
      Name = "John";
      Surname = "Smith";
   }
}

然后，您需要为 DesignInstance 指定 IsDesignTimeCreatable=True 以便在设计时启用实例创建(否则您指定的类型仅用于有关类型成员的信息，以便在设计时间):

<StackPanel d:DataContext="{d:DesignInstance TestForDesignTimeData:AvatarDesignTime, IsDesignTimeCreatable=True}">