我正在尝试为典型的二元列表情况定义一个用户控件(其中有两个物品列表并排和按钮控件,以导致从一个项目转移到一个项目中其他(。我不是很精通WPF-我学到的大部分内容都是通过这样的网站零碎的。我了解到,我可以为控件创建自定义依赖属性属性,以便可以将控件中的项目(按钮,文本框等(推迟绑定,直到实际使用控件为止。但是,对于我的控件,我将拥有这两个列表(可能是因为我的大多数代码迄今已涉及到它们(,但是它们需要比绑定更多,所以我想做的就是这样的事情:
<MyUserControl . . . .>
<DataGrid . . . .>
<DataGrid . . . .>
</MyUserControl>
,但我不知道如何做到这一点。我认为可能有某种方法可以将ContentControls用作数据杂志的替身,然后以某种方式将数据杂志链接回USerControl中的ContentControls,但我不太了解ContentControls,我发现使用它们的示例似乎都没有完全适用于我想做的事情。
有人可以将我指向正确的方向吗?谢谢。
我做了更多的研究,并在这里找到了一种有希望的方法:如何通过用户的XAML动态地添加控件?
我做了一个小的概念验证项目,它效果很好,所以我想在这里分享。它使用Galasoft的MVVM轻框架。
我创建了一个用文本块,一个contentControl和一个按钮的用户控件:
<UserControl x:Class="DataGridInUserControlDemo.UserControls.DGPlusUC"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:ignore="http://www.galasoft.ch/ignore"
mc:Ignorable="d ignore"
x:Name="ControlRoot">
<Grid DataContext="{Binding ElementName=ControlRoot}" Margin="10, 10, 10, 10" MinHeight="300" MinWidth="300">
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="5*"/>
<RowDefinition Height="2*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="{Binding Path=BannerText}" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="20"/>
<ContentControl Grid.Row="1" Content="{Binding Path=InnerContent}" />
<Button Grid.Row="2" x:Name="DemoButton" Content="{Binding Path=ButtonContent}" Command="{Binding Path=ButtonCommand}" Width="75" Height="25" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>
</UserControl>
我希望将userControl外部绑定的属性本身与自定义依赖关系绑定。
这是包含依赖关系定义的用户控件的代码 - 刺激:
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace DataGridInUserControlDemo.UserControls
{
public partial class DGPlusUC : UserControl
{
public DGPlusUC()
{
InitializeComponent();
}
public const string BannerTextPropertyName = "BannerText";
public string BannerText
{
get
{
return (string)GetValue(BannerTextProperty);
}
set
{
SetValue(BannerTextProperty, value);
}
}
public static readonly DependencyProperty BannerTextProperty = DependencyProperty.Register(
BannerTextPropertyName,
typeof(string),
typeof(DGPlusUC));
public const string ButtonContentPropertyName = "ButtonContent";
public string ButtonContent
{
get
{
return (string)GetValue(ButtonContentProperty);
}
set
{
SetValue(ButtonContentProperty, value);
}
}
public static readonly DependencyProperty ButtonContentProperty = DependencyProperty.Register(
ButtonContentPropertyName,
typeof(string),
typeof(DGPlusUC));
public const string ButtonCommandPropertyName = "ButtonCommand";
public ICommand ButtonCommand
{
get
{
return (ICommand)GetValue(ButtonCommandProperty);
}
set
{
SetValue(ButtonCommandProperty, value);
}
}
public static readonly DependencyProperty ButtonCommandProperty = DependencyProperty.Register(
ButtonCommandPropertyName,
typeof(ICommand),
typeof(DGPlusUC));
public const string InnerContentPropertyName = "InnerContent";
public UIElement InnerContent
{
get
{
return (UIElement)GetValue(InnerContentProperty);
}
set
{
SetValue(InnerContentProperty, value);
}
}
public static readonly DependencyProperty InnerContentProperty = DependencyProperty.Register(
InnerContentPropertyName,
typeof(UIElement),
typeof(DGPlusUC));
}
}
这是主窗口的XAML:
<Window x:Class="DataGridInUserControlDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:ignore="http://www.galasoft.ch/ignore"
xmlns:demo="clr-namespace:DataGridInUserControlDemo.UserControls"
mc:Ignorable="d ignore"
Height="400"
Width="400"
Title="MVVM Light Application"
DataContext="{Binding Main, Source={StaticResource Locator}}">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Skins/MainSkin.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid x:Name="LayoutRoot">
<demo:DGPlusUC BannerText="{Binding UCTitle}" ButtonContent="{Binding ButtonText}" ButtonCommand="{Binding ButtonCommand}" HorizontalAlignment="Center" VerticalAlignment="Center">
<demo:DGPlusUC.InnerContent>
<Grid DataContext="{Binding Main, Source={StaticResource Locator}}">
<DataGrid ItemsSource="{Binding Path=DataItems}" AutoGenerateColumns="True" />
</Grid>
</demo:DGPlusUC.InnerContent>
</demo:DGPlusUC>
</Grid>
</Window>
自定义依赖性property(S(用作控件中的标签,以绑定到ViewModel中的属性。
注意包围的demo:DGPlusUC.InnerContent
-这是ContentControl的替换代码所在的位置。嵌入的UserControl继承了窗口的数据台面,但由于某种原因,本节没有进行尝试,在尝试一下之后,我只是举起了手并明确声明了DataContext。
这是ViewModel代码:
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.CommandWpf;
using DataGridInUserControlDemo.Model;
using System.Windows.Input;
using System.Collections.ObjectModel;
namespace DataGridInUserControlDemo.ViewModel
{
public class MainViewModel : ViewModelBase
{
private readonly IDataModel theModel;
private ObservableCollection<DataItem> _DataItems;
public ObservableCollection<DataItem> DataItems
{
get
{
return _DataItems;
}
set
{
if (_DataItems == value)
{
return;
}
var oldValue = _DataItems;
_DataItems = value;
RaisePropertyChanged(() => DataItems, oldValue, value, true);
}
}
private string _ButtonText = "First";
public string ButtonText
{
get
{
return this._ButtonText;
}
set
{
if (this._ButtonText == value)
{
return;
}
var oldValue = this._ButtonText;
this._ButtonText = value;
RaisePropertyChanged(() => ButtonText, oldValue, value, true);
}
}
private string _UCTitle = string.Empty;
public string UCTitle
{
get
{
return this._UCTitle;
}
set
{
if (this._UCTitle == value)
{
return;
}
var oldValue = this._UCTitle;
this._UCTitle = value;
RaisePropertyChanged(() => UCTitle, oldValue, value, true);
}
}
private ICommand _ButtonCommand;
public ICommand ButtonCommand
{
get
{
return this._ButtonCommand;
}
set
{
if (this._ButtonCommand == value)
{
return;
}
var oldValue = this._ButtonCommand;
this._ButtonCommand = value;
RaisePropertyChanged(() => ButtonCommand, oldValue, value, true);
}
}
public MainViewModel(IDataModel model)
{
this.theModel = model;
this._UCTitle = "DataGrid in User Control Demo";
this._DataItems = new ObservableCollection<DataItem>(this.theModel.SomeData);
this._ButtonCommand = new RelayCommand(this.ButtonCmd, () => { return true; }) ;
}
private void ButtonCmd()
{
if (this.ButtonText == "First")
{
this.ButtonText = "Second";
}
else
{
this.ButtonText = "First";
}
}
}
}
最后,这是结果:
usercontrol演示中的datagrid