如何使用xaml将datagrid绑定到collectionviewsource [英] how to bind datagrid to collectionviewsource using xaml
问题描述
我的Person类：
public class Persons：ObservableCollection< Person>
{
// ...
}
xaml数据绑定：
< Window.Resources>
< local：Persons x：Key =_ Persons/>
< CollectionViewSource x：Key =cvsPersonsSource ={StaticResource _Persons}/>
< /Window.Resources>
datagrid绑定：
< DataGrid x：Name =myDataGridItemsSource ={Binding Source = {StaticResource cvsPersons}}/>
后面的代码：
_Persons =（Persons）this.Resources [_ Persons];
_persons = //一些方法来填充perons;
cvsPersons =（CollectionViewSource）this.Resources [cvsPersons];
cvsPersons.Source = _Persons;
以上工作。 我的问题是，为什么我需要使用cvsPersons.Source = _Persons来设置collectionviews源代码？我以为我的第一个片段中的xaml做了这个工作：
_cvsPersons.Source = _Persons;
如果我需要所有这些代码，那么xaml数据绑定代码似乎没有什么好处，我也可以做代码后面的一切从我的（或许很少）理解中，代码背后所需的唯一代码是引用由xaml设置的实例，即：
_Persons =（Persons）this.Resources [_ Persons];
_persons = //一些方法来填充perons;
cvsPersons =（CollectionViewSource）this.Resources [cvsPersons];
如果我没有_cvsPersons.Source = _Persons;那么我的数据网格没有被填充。我的xaml就不行了。我想我的问题是更多的概念相关..
为了避免你的代码背后的方法，你应该使用MVVM模式 MVVM模型视图ViewModel 。一个可能的解决方案可能是这样的Person（作为模型）：
public class Person
{
public string Name {get;组; }
public int Age {get;组; }
}
您可以使用ObservableCollection of Persons来实现ViewModel初始化属性。
public class ViewModel
{
public ObservableCollection< Person>人{get;组; }
public ViewModel（）
{
Persons = new ObservableCollection< Person>（）;
}
}
您的MainWindow.cs现在必须初始化ViewModel：
public partial class MainWindow：Window
{
public ViewModel ViewModel;
public MainWindow（）
{
ViewModel = new ViewModel（）;
ViewModel.Persons.Add（new Person
{
Age = 29，
Name =Mustermann
}）;
ViewModel.Persons.Add（new Person
{
Age = 35，
Name =Meyer
}）;
this.DataContext = ViewModel;
InitializeComponent（）;
}
将DataContext设置为ViewModel对象很重要。我添加了一个Button来添加一个Person的方法。
private void AddPersonOnClick（object sender，RoutedEventArgs e）
{
ViewModel.Persons.Add人
{
年龄= 55，
名称=沙
}）;
}
现在您可以在XAML中实例化一个CollectionViewSource，并将其绑定到Persons ObservableCollection属性在您的ViewModel中。
< Window x：Class =DataGridStackoverflow.MainWindow
xmlns =http： /schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns：x =http://schemas.microsoft.com/winfx/2006/xaml
标题=MainWindow高度=350Width =525>
< Window.Resources>
< CollectionViewSource x：Key =PersonsCollectionViewSourceSource ={Binding Persons}/>
< /Window.Resources>
< Grid>
< Grid.RowDefinitions>
< RowDefinition Height =*/>
< RowDefinition Height =Auto/>
< /Grid.RowDefinitions>
< DataGrid Grid.Row =0ItemsSource ={Binding Source = {StaticResource PersonsCollectionViewSource}}/>
< Button x：Name =AddPersonGrid.Row =1Click =AddPersonOnClickHorizontalAlignment =Left>添加人< / Button>
< / Grid>
最后你必须设置ItemsSource，当您发布到CollectionViewSource，它的作用就像一个魅力。
编辑
我尝试过你的解决方案，它也是有效的。 MainWindow.xaml：
< Window.Resources>
< dataGridStackoverflow：Persons x：Key =Persons/>
< CollectionViewSource x：Key =PersonsCollectionViewSourceSource ={StaticResource Persons}/>
< /Window.Resources>
< Grid>
< Grid.RowDefinitions>
< RowDefinition Height =*/>
< RowDefinition Height =Auto/>
< /Grid.RowDefinitions>
< DataGrid Grid.Row =0ItemsSource ={Binding Source = {StaticResource PersonsCollectionViewSource}}/>
< Button x：Name =AddPersonGrid.Row =1Click =AddPersonOnClickHorizontalAlignment =Left>添加人< / Button>
< / Grid>
重要的是，在InitializeComponent（）之后初始化您的人物集合。 MainWindow.cs
InitializeComponent（）;
人员=（人）this.FindResource（Persons）;
persons.Add（new Person
{
Age = 23，
Name =Dude
}）;
此解决方案没有代码隐藏结构可以设置ItemsSource。
I have a datagrid which is bound to a collectionviewsource, which is bound to an observablecollection. In following a guide I've set it up like so:
My Persons class:
public class Persons : ObservableCollection<Person>
{
//...
}
The xaml data bindings:
<Window.Resources>
<local:Persons x:Key="_Persons"/>
<CollectionViewSource x:Key="cvsPersons" Source="{StaticResource _Persons}" />
</Window.Resources>
The datagrid binding:
<DataGrid x:Name="myDataGrid" ItemsSource="{Binding Source={StaticResource cvsPersons}}"/>
The code behind:
_Persons = (Persons)this.Resources["_Persons"];
_persons = //some method to fill perons;
cvsPersons = (CollectionViewSource)this.Resources["cvsPersons"];
cvsPersons.Source = _Persons;
The above works. My question is, why do I need to set the collectionviewsource.source in code behind using cvsPersons.Source = _Persons;? I thought the xaml in my very first snippet did this job:
_cvsPersons.Source = _Persons;
If I need all this code behind then the xaml databinding code seems of little benefit, I may as well do everything in code behind. From my (perhaps little) understanding, the only code needed in code behind would be to reference the instances setup by xaml, ie:
_Persons = (Persons)this.Resources["_Persons"];
_persons = //some method to fill perons;
cvsPersons = (CollectionViewSource)this.Resources["cvsPersons"];
If I don't have _cvsPersons.Source = _Persons; then my datagrid does not get populated. My xaml as it stands doesn't do the job. I guess my question is more concept related..
To avoid your code behind approach you should use the MVVM-pattern MVVM Model View ViewModel . A possible solution could be a "Person" (acting as the Model) like this:
public class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
The you could implement a ViewModel initializing a property with an ObservableCollection of Persons.
public class ViewModel
{
public ObservableCollection<Person> Persons { get; set; }
public ViewModel()
{
Persons = new ObservableCollection<Person>();
}
}
Your MainWindow.cs now has to initialize the ViewModel:
public partial class MainWindow : Window
{
public ViewModel ViewModel;
public MainWindow()
{
ViewModel = new ViewModel();
ViewModel.Persons.Add(new Person
{
Age = 29,
Name = "Mustermann"
});
ViewModel.Persons.Add(new Person
{
Age = 35,
Name = "Meyer"
});
this.DataContext = ViewModel;
InitializeComponent();
}
It is important to set the DataContext to the ViewModel object. I added a Button an the method to add a Person.
private void AddPersonOnClick(object sender, RoutedEventArgs e)
{
ViewModel.Persons.Add(new Person
{
Age = 55,
Name = "Sand"
});
}
Now you can instantiate an CollectionViewSource in XAML and bind it to the Persons ObservableCollection property in your ViewModel.
<Window x:Class="DataGridStackoverflow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<CollectionViewSource x:Key="PersonsCollectionViewSource" Source="{Binding Persons}" />
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<DataGrid Grid.Row="0" ItemsSource="{Binding Source={StaticResource PersonsCollectionViewSource}}" />
<Button x:Name="AddPerson" Grid.Row="1" Click="AddPersonOnClick" HorizontalAlignment="Left">Add Person</Button>
</Grid>
Finally you have to set the ItemsSource as you posted it to the CollectionViewSource and it works like a charm.
EDIT
I tried your solution and it's working as well. MainWindow.xaml:
<Window.Resources>
<dataGridStackoverflow:Persons x:Key="Persons" />
<CollectionViewSource x:Key="PersonsCollectionViewSource" Source="{StaticResource Persons}" />
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<DataGrid Grid.Row="0" ItemsSource="{Binding Source={StaticResource PersonsCollectionViewSource}}" />
<Button x:Name="AddPerson" Grid.Row="1" Click="AddPersonOnClick" HorizontalAlignment="Left">Add Person</Button>
</Grid>
And it's important that you initialize your Persons Collection after the InitializeComponent(). MainWindow.cs
InitializeComponent();
Persons persons = (Persons)this.FindResource("Persons");
persons.Add(new Person
{
Age = 23,
Name = "Dude"
});
This solution works without code-behind constructs to set the ItemsSource.
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