大约两周前，我开始在WPF中开发，由于我只在WinForms中开发，因此我遇到了常见问题，但设法找到了解决方案。但是，目前我陷入了困境：将具有多列的项目(通过视觉基本代码，而不是 xaml)添加到列表视图中。
我不确定是否最好为此使用 Listview 或 DataGrid 控件，但基本上我希望用户能够将喜爱的歌曲添加到列表中，将它们保存到文件中并在打开应用程序时加载文件。列表视图当前有三列："艺术家"、"歌曲"和"状态"。
当我在WinForms中编程时，我曾经这样做：
Dim Song As New ListViewItem
Form1.ListView1.Items.Add(Song)
Song.Text = TextBox1.Text
Song.SubItems.Add(TextBox2.Text)
Song.SubItems.Add(TextBox3.Text)
然后，要保存：
Dim Song As New ListViewItem
Form1.ListView1.Items.Add(Song)
Song.Text = TextBox1.Text
Song.SubItems.Add(TextBox2.Text)
Song.SubItems.Add(TextBox3.Text)
Try
Dim myWriter As New IO.StreamWriter(PATH_DATABASE)
For Each myItem As ListViewItem In Form1.ListView1.Items
myWriter.WriteLine(myItem.Text & "|" & myItem.SubItems(1).Text & "|" & myItem.SubItems(2).Text & "|" & myItem.SubItems(3).Text
Next
myWriter.Close()
Catch ex As Exception
MsgBox("Error: " & ex.Message, vbCritical, "Error")
End Try
我一直在搜索，发现我需要使用绑定，所以我尝试了这个：
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel
Imports System.Windows
Public Structure Song
Public _artist As String
Public _title As String
Public _status As String
Property Artist() As String
Get
Return _artist
End Get
Set(ByVal Value As String)
_artist = Value
End Set
End Property
Property Title() As String
Get
Return _title
End Get
Set(ByVal Value As String)
_title = Value
End Set
End Property
Property Status() As String
Get
Return _status
End Get
Set(ByVal Value As String)
_status = Value
End Set
End Property
End Structure
Public Class WINDOW_AddSong
Dim songs As New ObservableCollection(Of Song)
Private Sub Button1_Click(sender As Object, e As RoutedEventArgs) Handles Button1.Click
Dim Song As New ListViewItem
For Each wnd As Window In Application.Current.Windows
If wnd.GetType Is GetType(MainWindow) Then
DirectCast(wnd, MainWindow).Listview1.Items.Add(Alimento)
Alimento.Content = New Song() With {._artist = "Lol", ._title = "Lol2", ._status = "Lol3"}
End If
Next
End Sub
End Class
在 XAML 列表视图中：
<GridViewColumn Header="Artist" DisplayMemberBinding="{Binding Artist}"/>
<GridViewColumn Header="Title" DisplayMemberBinding="{Binding Title}"/>
<GridViewColumn Header="Status" DisplayMemberBinding="{Binding Status}"/>
这有效，但我不确定这是否是 WPF 的做事方式。
但是，我被困在保存过程中：
Try
Dim myWriter As New IO.StreamWriter(PATH_DATABASE)
For Each wnd As Window In Application.Current.Windows
If wnd.GetType Is GetType(MainWindow) Then
For Each myItem As ListViewItem In DirectCast(wnd, MainWindow).Listview1.Items
myWriter.WriteLine(Song, Artist, Status)
Next
End If
Next
myWriter.Close()
Catch ex As Exception
MsgBox("Error: " & ex.Message, vbCritical, "Error")
End Try
这行不通。 此外，PATH_DATABASE只是一个目录。
总而言之，专家可以审查我的代码并检查我是否做"正确"的事情，如果可能的话，你能帮助我完成保存和加载过程吗？
谢谢。
我刚刚更新了您的结构(我使用了一个类，只是习惯的力量)以使用最新版本的 VS 中可用的自动属性值。属性的默认实现与 backer 字段一起内置。它像以前一样使用。
您在 ObservableCollection 方面走在正确的轨道上，但您需要通过添加 Event PropertyChanged 并提供 Sub OnPropertyChanged 来引发事件来实现 INotifyPropertyChanged。
在控件上设置绑定，并将列表视图的 ItemsSource 设置为可观察列表。
保存 Import System.Text，以便您可以使用 StringBuilder。循环遍历列表以生成要保存到文本文件的字符串。
我没有花任何时间试图让XAML Windows看起来不错。请原谅丑陋。
Class MainWindow
Public Songs As New ObservableCollection(Of Song)
Protected Sub OnLoad(sender As Object, e As RoutedEventArgs)
Songs.Add(New Song("Nirvana", "Smells Like Teen Spirit", "Open"))
Songs.Add(New Song("John Lennon", "Imagine", "In Stock"))
Songs.Add(New Song("U2", "One", "Unknown"))
Songs.Add(New Song("Michael Jackson", "Billie Jean", "Open"))
lvSongs.ItemsSource = Songs
End Sub
Private Sub BtnAdd_Click(sender As Object, e As RoutedEventArgs)
Dim frm As New frmAdd
frm.mainForm = Me 'send the instance of the current form to the new form
frm.ShowDialog()
End Sub
Private Sub SaveList()
Dim sb As New StringBuilder
For Each item As Song In Songs
sb.AppendLine($"{item.Artist}|{item.Title}|{item.Status}")
Next
'call sb.ToString and write it to a .txt file
End Sub
End Class
主窗口 XAML
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WPF_BindComboBox"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid Loaded="OnLoad"
Name="root">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ListView Margin="10" Name="lvSongs" Grid.Row="0">
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="Name: " />
<TextBox x:Name="txtArtist"
Text="{Binding Artist, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
FontWeight="Bold"/>
<TextBlock Text=", " />
<TextBlock Text="Age: " />
<TextBox Text="{Binding Title}"
FontWeight="Bold" />
<TextBlock Text=" (" />
<TextBox Text="{Binding Status}" />
<TextBlock Text=")" />
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Button x:Name="btnAdd" Grid.Row="1" Height="25" Width="100" Content="Add a Song" Click="BtnAdd_Click"/>
</Grid>
</Window>
宋类
Public Class Song
Implements INotifyPropertyChanged
Public Property Artist() As String
Public Property Title() As String
Public Property Status() As String
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Protected Sub OnPropertyChanged(ByVal name As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))
End Sub
Public Sub New(art As String, Ttl As String, Stat As String)
Artist = art
Title = Ttl
Status = Stat
End Sub
End Class
"添加"窗口
Public Class frmAdd
Public mainForm As MainWindow
Private Sub BtnAdd_Click(sender As Object, e As RoutedEventArgs)
mainForm.Songs.Add(New Song(txtArtist.Text, txtTitle.Text, txtStatus.Text))
ClearForm()
End Sub
Private Sub ClearForm()
txtArtist.Clear()
txtTitle.Clear()
txtStatus.Clear()
End Sub
End Class
添加窗口 XAML
<Window x:Class="frmAdd"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WPF_BindComboBox"
mc:Ignorable="d"
Title="frmAdd" Height="172.641" Width="307.547">
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Grid.Row="0" Text="Artist" FontSize="16" FontWeight="Bold"/>
<TextBox x:Name="txtArtist" Grid.Column="1" Grid.Row="0" FontSize="16" Width="150" />
<TextBlock Grid.Column="0" Grid.Row="1" Text="Title" FontSize="16" FontWeight="Bold"/>
<TextBox x:Name="txtTitle" Grid.Column="1" Grid.Row="1" FontSize="16" Width="150"/>
<TextBlock Grid.Column="0" Grid.Row="2" Text="Status" FontSize="16" FontWeight="Bold"/>
<TextBox x:Name="txtStatus" Grid.Column="1" Grid.Row="2" FontSize="16" Width="150"/>
<Button x:Name="btnAdd" Grid.Column="1" Grid.Row="4" Content="Add Song" Click="BtnAdd_Click"/>
</Grid>
</Window>
编辑所需的导入
Imports System.Collections.ObjectModel
Imports System.ComponentModel
Imports System.Text