[英]How can I access x:name in the code behind in Xamarin?
因此,我有一個MasterDetails設置,我想要實現的是以下內容:如果我在菜單(MasterView)中選擇一個項目,則會看到其結果(DetailsView)。 此DetailsView是具有ViewCells的ListView。 到現在為止還挺好。 現在,我想導航到DetailsPage內容的詳細信息。 讓我向您展示此代碼:
XAML-AssignmentListPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="App.Views.AssignmentListPage"
Title="Opdrachten">
<ListView x:Name="AssignmentsListView" Margin="20">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Padding="20,0,0,0" HorizontalOptions="StartAndExpand" Orientation="Horizontal">
<Label x:Name="myAssignments" Text="{Binding Title}" VerticalTextAlignment="Center" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
和代碼隱藏文件:
C#-AssignmentListPage.xaml.cs
public partial class AssignmentListPage : ContentPage
{
public AssignmentListPage ()
{
InitializeComponent ();
NavigateDetails();
}
protected override async void OnAppearing()
{
base.OnAppearing();
AssignmentsListView.ItemsSource = await
App.AssignmentManager.GetAssignmentsAsync();
}
public void NavigateDetails()
{
var tap = new TapGestureRecognizer();
tap.Tapped += (s, e) => OnLabelClickedAsync();
myAssignments.GestureRecognizers.Add(tap);
}
public async Task OnLabelClickedAsync()
{
await Navigation.PushAsync(new AssignmentDetailsPage());
}
}
問題是, myAssignments
的代碼中的myAssignments
給了我一個“無法解析符號...”錯誤。
我已經嘗試了以下方法,但均未成功:
在NavigateDetails()
函數中,我將myAssignments
替換為:
var asd = this.FindByName<Label>("myAssignments");
asd.GestureRecognizers.Add(tap);
我也嘗試過使用this
,例如:
this.myAssignments.GestureRecognizers.Add(tap);
你們能告訴我我做錯了嗎? 我無法訪問標簽。
在XAML中添加手勢識別器
<Label x:Name="myAssignments" Text="{Binding Title}" VerticalTextAlignment="Center" >
<Label.GestureRecognizers>
<TapGestureRecognizer Tapped="OnLabelClickedAsync" />
</Label.GestureRecognizers>
</Label>
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