在數據網格列中顯示ObservableCollection的元素

Question

我有一個程序，我正在讀取一個帶有2列的.csv文件，而我的模型有2個屬性。 我讀取這個模型的實例，然後將它們添加到我的ObvervableCollection中。

這裏是什麼樣子：

// My data field 
private ObservableCollection<Model> _internalFile = new ObservableCollection<Model>(); 

// My data accessor/setter 
public ObservableCollection<Model> InternalFile { get { return _internalFile; } set { _internalFile = value; } } 

Model x = new Model(); 

while (fileReader.Peek() != -1) 
    { 
    // words = read the line, split the line, make a list of columns 
    var words = fileReader.ReadLine().Split(',').ToList(); 
    if (words[0] != "Name") 
    { 
    x.asWord = words[0]; 
    x.asNumber = int.Parse(words[1]); 
    InternalFile.Add(x); 
    // InternalFile is a collection of 'Model' objects. 
    // So created 'Model' placeholder , x, and pile each instance of x 
    // in the collection to be displayed. 
    } 
    } 

我的XAML看起來像這樣

<Window x:Class="WpfMVVP.WindowView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:WpfMVVP" 
    Title="Window View" Height="350" Width="525" Background="White"> 
<Grid> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto"/> 
     <RowDefinition Height="Auto"/> 
    </Grid.RowDefinitions> 
    <DataGrid Grid.Row="0" AutoGenerateColumns="False" CanUserReorderColumns="False" ItemsSource="{Binding Path=InternalFile}"> 
     <DataGrid.Columns> 
      <DataGridTextColumn Header="As Word" IsReadOnly="True" Width="Auto" Binding="{Binding asWord}" /> 
      <DataGridTextColumn Header="As Number" IsReadOnly="True" Width="Auto" Binding="{Binding asNumber}" /> 
     </DataGrid.Columns> 
    </DataGrid> 

    <Label Grid.Row="1" Content="{Binding Status}" /> 
</Grid> 

在顯示時，我看到的列填充窗口，但所有行在文件結束之前讀取的最後一行。就好像ObservableCollection正在用新值覆蓋以前的元素。我不知道爲什麼它會這樣。

Answer 1

你只是創建Model一次，每一次瓦特/最近的數據讀覆蓋它。你想要做的是爲每行讀取創建一個新的Model。你可以簡單地在你的while循環中移動你的Model實例。 （見下文）

// My data field 
private ObservableCollection<Model> _internalFile = new ObservableCollection<Model>(); 

// My data accessor/setter 
public ObservableCollection<Model> InternalFile { get { return _internalFile; } set { _internalFile = value; } } 

while (fileReader.Peek() != -1) 
    { 
    Model x = new Model(); 
    // words = read the line, split the line, make a list of columns 
    var words = fileReader.ReadLine().Split(',').ToList(); 

     if ((words[0] != "Name") && (!String.IsNullOrEmpty(words[0])) 
     { 
     x.asWord = words[0]; 
     x.asNumber = int.Parse(words[1]); 
     InternalFile.Add(x); 
     // InternalFile is a collection of 'Model' objects. 
     // So created 'Model' placeholder , x, and pile each instance of x 
     // in the collection to be displayed. 
     } 
    }