特定数据类型的特定控件 [英] Specific control for a specific DataType

问题描述

我有一个包含不同类型对象的列表:

I have a List which contains different types of objects:

    List<object> myList = new List<object>();
    DateTime date = DateTime.Now;
    myList.Add(date);
    int digit = 50;
    myList.Add(digit);
    myList.Add("Hello World");
    var person = new Person() { Name = "Name", LastName = "Last Name", Age = 18 };
    list.ItemsSource = myList;

    public class Person
    {
         public string Name { get; set; }
         public string LastName { get; set; }
         public int Age { get; set; }
    }

我想在带有不同控件的ListBox中看到它们.例如:DatePicker表示DateTime，TextBlock表示string，TextBox表示Person的名称和姓氏...

I want to see them in a ListBox with different kinds of controls. For instance: DatePicker for DateTime, TextBlock for string, TextBox for Person's Name and LastName...

是否可以通过XAML执行此任务?

Is it possible to do this task with XAML?

帮助表示赞赏.

推荐答案

<Window x:Class="MiscSamples.DataTemplates"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        Title="DataTemplates"
        Height="300"
        Width="300">
  <Window.Resources>

    <!-- DataTemplate for strings -->
    <DataTemplate DataType="{x:Type sys:String}">
      <TextBox Text="{Binding Path=.}" />
    </DataTemplate>

    <!-- DataTemplate for DateTimes -->
    <DataTemplate DataType="{x:Type sys:DateTime}">
      <DataTemplate.Resources>
        <DataTemplate DataType="{x:Type sys:String}">
          <TextBlock Text="{Binding Path=.}" />
        </DataTemplate>
      </DataTemplate.Resources>
      <DatePicker SelectedDate="{Binding Path=.}" />
    </DataTemplate>


    <!-- DataTemplate for Int32 -->
    <DataTemplate DataType="{x:Type sys:Int32}">
      <Slider Maximum="100"
              Minimum="0"
              Value="{Binding Path=.}"
              Width="100" />
    </DataTemplate>
  </Window.Resources>
  <ListBox ItemsSource="{Binding}" />
</Window>

后面的代码:

 public partial class DataTemplates : Window
    {
        public DataTemplates()
        {
            InitializeComponent();

            var myList = new List<object>();
            myList.Add(DateTime.Now);
            myList.Add(50);
            myList.Add("Hello World");

            DataContext = myList;
        }
    }

结果:

如您所见，完全没有理由使用在WPF中使用代码来操作UI元素(某些非常特殊的情况除外)

As you can see, there's no reason at all to use code to manipulate UI elements in WPF (except some very very specific cases)

请注意，通常不会为System命名空间内的类(例如System.String)创建DataTemplate.这仅是一个示例.如果确实需要，则可能必须创建每种类型的ViewModel.

Note that you don't usually create a DataTemplate for classes inside the System namespace (such as System.String. This is only to give you an example. If you really needed this you would probably have to create a ViewModel for each type.

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