我正在研究基于this one的数据网格示例。
<dg:DataGrid x:Name="datagrid" ItemsSource="{Binding Teams}" SelectionEnabled="True" SelectedItem="{Binding SelectedTeam}" ActiveRowColor="Red"
RowHeight="70" HeaderHeight="50" BorderColor="#CCCCCC" HeaderBackground="#E0E6F8" Focused="Datagrid_Focused"
PullToRefreshCommand="{Binding RefreshCommand}" IsRefreshing="{Binding IsRefreshing}"
>
<x:Arguments>
<ListViewCachingStrategy>RetainElement</ListViewCachingStrategy>
</x:Arguments>
<dg:DataGrid.HeaderFontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Tablet>15</OnIdiom.Tablet>
<OnIdiom.Phone>12</OnIdiom.Phone>
</OnIdiom>
</dg:DataGrid.HeaderFontSize>
<dg:DataGrid.Columns>
<dg:DataGridColumn Title="Logo" PropertyName="Logo" Width="100" SortingEnabled="False">
<dg:DataGridColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding}" HorizontalOptions="Center" VerticalOptions="Center" Aspect="AspectFit" HeightRequest="60" />
</DataTemplate>
</dg:DataGridColumn.CellTemplate>
</dg:DataGridColumn>
<dg:DataGridColumn Title="Team" PropertyName="Name" Width="2*">
<dg:DataGridColumn.CellTemplate>
<DataTemplate>
<Grid x:Name="gridtest" BindingContext="{Binding .}">
<Grid.GestureRecognizers>
<TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"/>
</Grid.GestureRecognizers>
<Label x:Name="label1" Text="{Binding Name,Mode=TwoWay}" />
<Editor x:Name="editorTest" Completed="Editor_Completed" BindingContext="{Binding .}" Focused="Editor_Focused">
</Editor>
</Grid>
</DataTemplate>
</dg:DataGridColumn.CellTemplate>
</dg:DataGridColumn>
<dg:DataGridColumn Title="Win" PropertyName="Win" Width="0.95*"/>
<dg:DataGridColumn Title="Loose" PropertyName="Loose" Width="1*"/>
<dg:DataGridColumn PropertyName="Home">
<dg:DataGridColumn.FormattedTitle>
<FormattedString>
<Span Text="Home" ForegroundColor="Black" FontSize="13" FontAttributes="Bold"/>
<Span Text=" (win-loose)" ForegroundColor="#333333" FontSize="11" />
</FormattedString>
</dg:DataGridColumn.FormattedTitle>
</dg:DataGridColumn>
<dg:DataGridColumn Title="Percentage" PropertyName="Percentage" StringFormat="{}{0:0.00}" />
</dg:DataGrid.Columns>
</dg:DataGrid>
我有一个团队模型，我在编辑器中输入的名称应绑定在该模型属性中。在静态情况下，它可以正常工作。如何在动态情况下实现效果，
我有添加按钮。仅在添加按钮中，我要将项目添加到集合团队中，
private void AddButton_Clicked(object sender, EventArgs e)
{
viewModel.Teams.Add(new Models.Team()
{
Win = 73,
Name = "",
Loose = 9,
Percentage = 0.89,
Conf = "46-6",
Div = "15-1",
Home = "39-2",
Road = "34-7",
Last10 = "8-2",
Streak = "W 4",
Logo = "gsw.png"
});
}
打开编辑器时，datagrid selectedItem事件不起作用。文本未绑定到模型属性Name。
单击保存按钮时，我需要更新的收藏集。
如何实现这种情况？
由于您已使用MVVM，因此您应该处理ViewModel中的所有逻辑。您可以在模型中绑定Editor的Text。
<Editor Text="{Binding editorText,Mode=TwoWay}"... />在模型中
定义新属性
public class Team : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(string property) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(property)); } string editorText; public string EditorText { get { return editorText; } set { if(value!=null) { editorText = value; OnPropertyChanged("EditorText"); } } } //... }打开编辑器时，datagrid selectedItem事件不起作用。
这可能是插件的问题。您可以在编辑器聚焦时设置SelectItem。
在您的项目中添加以下课程
using System; using Xamarin.Forms; namespace xxx { public class BehaviorBase<T> : Behavior<T> where T : BindableObject { public T AssociatedObject { get; private set; } protected override void OnAttachedTo (T bindable) { base.OnAttachedTo (bindable); AssociatedObject = bindable; if (bindable.BindingContext != null) { BindingContext = bindable.BindingContext; } bindable.BindingContextChanged += OnBindingContextChanged; } protected override void OnDetachingFrom (T bindable) { base.OnDetachingFrom (bindable); bindable.BindingContextChanged -= OnBindingContextChanged; AssociatedObject = null; } void OnBindingContextChanged (object sender, EventArgs e) { OnBindingContextChanged (); } protected override void OnBindingContextChanged () { base.OnBindingContextChanged (); BindingContext = AssociatedObject.BindingContext; } } }using System; using System.Reflection; using System.Windows.Input; using Xamarin.Forms; namespace xxx { public class EventToCommandBehavior : BehaviorBase<View> { Delegate eventHandler; public static readonly BindableProperty EventNameProperty = BindableProperty.Create ("EventName", typeof(string), typeof(EventToCommandBehavior), null, propertyChanged: OnEventNameChanged); public static readonly BindableProperty CommandProperty = BindableProperty.Create ("Command", typeof(ICommand), typeof(EventToCommandBehavior), null); public static readonly BindableProperty CommandParameterProperty = BindableProperty.Create ("CommandParameter", typeof(object), typeof(EventToCommandBehavior), null); public static readonly BindableProperty InputConverterProperty = BindableProperty.Create ("Converter", typeof(IValueConverter), typeof(EventToCommandBehavior), null); public string EventName { get { return (string)GetValue (EventNameProperty); } set { SetValue (EventNameProperty, value); } } public ICommand Command { get { return (ICommand)GetValue (CommandProperty); } set { SetValue (CommandProperty, value); } } public object CommandParameter { get { return GetValue (CommandParameterProperty); } set { SetValue (CommandParameterProperty, value); } } public IValueConverter Converter { get { return (IValueConverter)GetValue (InputConverterProperty); } set { SetValue (InputConverterProperty, value); } } protected override void OnAttachedTo (View bindable) { base.OnAttachedTo (bindable); RegisterEvent (EventName); } protected override void OnDetachingFrom (View bindable) { DeregisterEvent (EventName); base.OnDetachingFrom (bindable); } void RegisterEvent (string name) { if (string.IsNullOrWhiteSpace (name)) { return; } EventInfo eventInfo = AssociatedObject.GetType ().GetRuntimeEvent (name); if (eventInfo == null) { throw new ArgumentException (string.Format ("EventToCommandBehavior: Can't register the '{0}' event.", EventName)); } MethodInfo methodInfo = typeof(EventToCommandBehavior).GetTypeInfo ().GetDeclaredMethod ("OnEvent"); eventHandler = methodInfo.CreateDelegate (eventInfo.EventHandlerType, this); eventInfo.AddEventHandler (AssociatedObject, eventHandler); } void DeregisterEvent (string name) { if (string.IsNullOrWhiteSpace (name)) { return; } if (eventHandler == null) { return; } EventInfo eventInfo = AssociatedObject.GetType ().GetRuntimeEvent (name); if (eventInfo == null) { throw new ArgumentException (string.Format ("EventToCommandBehavior: Can't de-register the '{0}' event.", EventName)); } eventInfo.RemoveEventHandler (AssociatedObject, eventHandler); eventHandler = null; } void OnEvent (object sender, object eventArgs) { if (Command == null) { return; } object resolvedParameter; if (CommandParameter != null) { resolvedParameter = CommandParameter; } else if (Converter != null) { resolvedParameter = Converter.Convert (eventArgs, typeof(object), null, null); } else { resolvedParameter = eventArgs; } if (Command.CanExecute (resolvedParameter)) { Command.Execute (resolvedParameter); } } static void OnEventNameChanged (BindableObject bindable, object oldValue, object newValue) { var behavior = (EventToCommandBehavior)bindable; if (behavior.AssociatedObject == null) { return; } string oldEventName = (string)oldValue; string newEventName = (string)newValue; behavior.DeregisterEvent (oldEventName); behavior.RegisterEvent (newEventName); } } }在xaml中
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:xxx" mc:Ignorable="d" x:Name="page" // set name here x:Class="xxx.MainPage"><Editor.Behaviors> <local:EventToCommandBehavior EventName="Focused" Command="{Binding Source={x:Reference page},Path=BindingContext.xxxCommand}" CommandParameter="{Binding }" /> </Editor.Behaviors>在ViewModel中]
xxxCommand = new Command((model)=>{ var item = model as Team; SelectedTeam = item; // ... });