当我尝试使用以下代码（用于记录剧院旅行的应用程序）添加日志或搜索日志时，我会被发送到 App.g.i.cs 自动生成的代码。我使用了断点并逐步执行了代码，它似乎完成了整个子例程，然后当它到达末尾时它抛出了这个，也许是 UI 的问题？
#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
UnhandledException += (sender, e) =>
{
if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
};
#endif
这是我的主页xaml代码
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyTheatreLog.MainPage"
xmlns:viewmodel="clr-namespace:MyTheatreLog.ViewModel"
x:DataType="viewmodel:MainViewModel"
Title="Theatre Log">
<Grid RowDefinitions="50, Auto, Auto, *, Auto"
ColumnDefinitions=".8*,.05*,.15*"
Padding="10"
RowSpacing="10"
ColumnSpacing="10">
<Entry Placeholder="New Log"
Grid.ColumnSpan="3"
Text="{Binding Show}"
Grid.Row="1"/>
<DatePicker Grid.Row="2"
Grid.Column="0"
Date="{Binding Date}"/>
<Button Text="+"
FontSize="30"
WidthRequest="20"
HeightRequest="20"
Command="{Binding AddCommand}"
Grid.Row="2"
Grid.Column="3"
HorizontalOptions="End"/>
<CollectionView Grid.Row="3" Grid.ColumnSpan="3"
ItemsSource="{Binding Shows}"
SelectionMode="None"
>
<CollectionView.ItemTemplate>
<DataTemplate x:DataType="viewmodel:ShowItem">
<SwipeView>
<Grid Padding="0,5">
<Frame CornerRadius="8"
HasShadow="True">
<Frame.GestureRecognizers>
<TapGestureRecognizer NumberOfTapsRequired="2"
Command="{Binding Source={RelativeSource AncestorType={x:Type viewmodel:MainViewModel}}, Path=DetailsCommand}"
CommandParameter="{Binding .}"/>
</Frame.GestureRecognizers>
<Grid ColumnDefinitions="*, 90">
<Label Text="{Binding Title}"
Grid.Column="0"
FontSize="14"/>
<Label Text="{Binding DateString}"
Grid.Column="1"/>
</Grid>
</Frame>
</Grid>
</SwipeView>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
<Entry Placeholder="Search Logs"
Grid.Row="4"
Text="{Binding Searchentry}"/>
<Button Grid.Row="4"
Grid.Column="1"
Grid.ColumnSpan="2"
Text="Search"
Command="{Binding SearchCommand}"/>
</Grid>
</ContentPage>
和我的 ViewModel 代码
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System.Collections.ObjectModel;
namespace MyTheatreLog.ViewModel
{
public class ShowItem
{
public string Title { get; set; }
public string DateString { get; set; }
}
public partial class MainViewModel : ObservableObject
{
private LocalDatabase localDatabase;
string appDataDirectory = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "MyTheatreLog");
public MainViewModel()
{
if (!Directory.Exists(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "MyTheatreLog")))
{
Directory.CreateDirectory(Path.Combine(appDataDirectory, "MyTheatreLog"));
}
Shows = new ObservableCollection<ShowItem>();
localDatabase = new LocalDatabase();
LoadLogs();
}
public void LoadLogs()
{
try
{
string[] logfiles = Directory.GetFiles(appDataDirectory, "*.txt");
Shows.Clear();
foreach (string file in logfiles)
{
using(StreamReader savefile = new StreamReader(file))
{
Title = savefile.ReadLine();
Datestring = savefile.ReadLine();
savefile.Close();
}
if (!string.IsNullOrEmpty(Title) && !string.IsNullOrEmpty(Datestring))
{
var showItem = new ShowItem { Title = Title, DateString = Datestring };
Shows.Add(showItem);
}
}
}
catch(Exception ex)
{
Console.WriteLine("Error loading logs " + ex.Message);
}
}
[ObservableProperty]
ObservableCollection<ShowItem> shows;
[ObservableProperty]
string show;
bool searching = false;
[ObservableProperty]
string title;
[ObservableProperty]
DateTime date = DateTime.Today;
[ObservableProperty]
string searchentry;
[ObservableProperty]
string filename;
[ObservableProperty]
String datestring;
[RelayCommand]
void Add()
{
// checks if entry is empty
if (string.IsNullOrWhiteSpace(Show))
return;
Datestring = Date.ToString("dd/MM/yyyy");
// adds show
Show = Show.Trim();
string filetitle = Show.Replace(" ", "") + Datestring.Replace("/", "");
Filename = filetitle + ".txt";
using (StreamWriter savefile = new StreamWriter(System.IO.Path.Combine(appDataDirectory, Filename), true))
{
//saves to file
savefile.WriteLine(Show);
savefile.WriteLine(Datestring);
savefile.Close();
}
LoadLogs();
Show = string.Empty;
}
[RelayCommand]
void Search()
{
try
{
var Showsholder = new ObservableCollection<ShowItem>();
Showsholder.Clear();
if (searching == false)
{
// checks if entry is empty
if (string.IsNullOrWhiteSpace(Searchentry))
return;
// fills Shows placeholder
foreach (var log in Shows)
{
Showsholder.Add(log);
}
Shows.Clear();
Searchentry = Searchentry.Trim();
Searchentry = Searchentry.ToLower();
foreach (var log in Showsholder)
{
string logtitle = log.Title;
string logsearched = logtitle.ToLower();
// Adds logs that match search
if (logsearched.Contains(Searchentry))
{
Shows.Add(log);
}
}
searching = true;
}
else
{
Shows.Clear();
LoadLogs();
searching = false;
}
Searchentry = string.Empty;
}
catch
{
Console.WriteLine("Error Searching");
}
}
[RelayCommand]
async Task Details(ShowItem s)
{
//navigates to Details Page
string filetitle = s.Title.Replace(" ", "");
string filedate = s.DateString.Replace("/", "");
Filename = filetitle + filedate + ".txt";
await Shell.Current.GoToAsync($"{"Details"}?Filename_={Filename}");
}
}
}
我对毛伊岛很陌生，我一直在尽力阅读并解决它，但没有运气
包含项目信息的新文件确实会在正确的位置以正确的名称创建，并在我下次运行代码时显示。
我遇到了同样的问题，我的问题是使用 x:Bind。
我需要使用绑定并更改模式：
<TextBlock Name="avgTimeDisplay" Text="{Binding AvgTime, Mode=TwoWay}" Visibility="{Binding LabelVisible, Mode=TwoWay}" ></TextBlock>
这与设置我的 ViewModel 一起：
public string AvgTime
{
get => avgTime;
set => SetProperty(ref avgTime, value);
}