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我試圖用鼠標重新訂購listView項目，當我開始拖動或放棄項目時，我得到這個神祕的Parameter is not valid ArgumentException。沒有其他細節，沒有堆棧跟蹤。崩潰整個應用程序。ArgumentException重新排序listViewItems
它時，我重新排序ObservableCollection<string>但不斷拍擊ObservableCollection<MyControl>
MyControl工作正常，只是一個簡單的UserControl有TextBlock內。我試過CollectionViewSource的方法和它是一樣的。
任何想法？
MainPage.xaml中
<Page
x:Class="App3.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App3"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<ListView ItemsSource="{Binding Items}" CanReorderItems="True" AllowDrop="True"/>
</Page>
MainPage.xaml.cs中
using Windows.UI.Xaml.Controls;
namespace App3
{
public sealed partial class MainPage : Page
{
private MainPageViewModel mainPageViewModel;
public MainPage()
{
this.InitializeComponent();
mainPageViewModel = new MainPageViewModel();
DataContext = mainPageViewModel;
// THIS IS NOT WORKING
MyControl myControl1 = new MyControl("Hello1");
MyControl myControl2 = new MyControl("Hello2");
MyControl myControl3 = new MyControl("Hello3");
mainPageViewModel.Items.Add(myControl1);
mainPageViewModel.Items.Add(myControl2);
mainPageViewModel.Items.Add(myControl3);
// THIS IS WORKING
//string s1 = "h1";
//string s2 = "h2";
//string s3 = "h3";
//mainPageViewModel.Items.Add(s1);
//mainPageViewModel.Items.Add(s2);
//mainPageViewModel.Items.Add(s3);
}
}
}
MainPageViewModel.cs
using System.Collections.ObjectModel;
namespace App3
{
public class MainPageViewModel : BaseModel
{
// THIS IS NOT WORKING
private ObservableCollection<MyControl> items = new ObservableCollection<MyControl>();
public ObservableCollection<MyControl> Items
{
get { return items; }
set
{
items = value;
OnPropertyChanged();
}
}
// THIS IS WORKING
//private ObservableCollection<string> items = new ObservableCollection<string>();
//public ObservableCollection<string> Items
//{
// get { return items; }
// set
// {
// items = value;
// OnPropertyChanged();
// }
//}
}
}
MyControl.xaml
<UserControl
x:Class="App3.MyControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App3"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400">
<TextBlock Name="tb"/>
</UserControl>
MyControl.cs
using Windows.UI.Xaml.Controls;
namespace App3
{
public sealed partial class MyControl : UserControl
{
public MyControl(string sName)
{
this.InitializeComponent();
tb.Text = sName;
}
}
}
BaseModel.cs
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace App3
{
public class BaseModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName]string name = "")
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
}
Ë DIT
看起來像重新排序簡單對象也沒有問題，所以我想在重新排序UserControl時出現了問題。
namespace App3
{
public class SampleClass
{
private string sName;
public SampleClass(string sName)
{
this.sName = sName;
}
public override string ToString()
{
return sName;
}
}
}
EDIT從CheckBox崩潰酷似MyControl派生2
重新排序對象。
using Windows.UI.Xaml.Controls;
namespace App3
{
public class MyCheckBox : CheckBox
{
public MyCheckBox(string sName)
{
Content = sName;
}
}
}
同樣爲標準複選框
CheckBox checkBox1 = new CheckBox() { Content = "hello1" };
CheckBox checkBox2 = new CheckBox() { Content = "hello2" };
CheckBox checkBox3 = new CheckBox() { Content = "hello3" };
mainPageViewModel.Items.Add(checkBox1);
mainPageViewModel.Items.Add(checkBox2);
mainPageViewModel.Items.Add(checkBox3);
EDIT 3
好像唯一的解決辦法是使用簡單的類用於保持數據
using Windows.UI.Xaml.Controls;
namespace App3
{
public class MyCheckBox : BaseModel
{
private string sName;
public string Name
{
get { return sName; }
set
{
sName = value;
OnPropertyChanged();
}
}
public MyCheckBox(string sName)
{
Name = sName;
}
}
}
和DataTemplate爲ListViewItem以顯示它
<Page
x:Class="App3.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App3"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<ListView ItemsSource="{Binding Items}" CanReorderItems="True" AllowDrop="True">
<ListView.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Name}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Page>
，而不是直接加入到UserControl項ListView。