將項目添加到ObservableCollection不會更改ListView

Question

當我向可觀察的集合中添加項目時，我無法弄清楚為什么我的ListView沒有更新。 這是UI的開頭

這是我添加項目后的樣子

無論出於何種原因，ListView都不選擇工作訂單，也不選擇簽入日期，但是它確實更新了TechCount ...

這是ListView代碼：

<ListView Grid.Row="2" 
        ItemsSource="{Binding LaborItems}"      
        SelectedItem="{Binding SelectedLaborItem}" 
        Margin="10,10,10,9">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="#" Width="55" DisplayMemberBinding="{Binding Labor.WorkOrderNo}"/>
            <GridViewColumn Header="Date" Width="100" DisplayMemberBinding="{Binding Labor.Time.CheckIn}"/>
            <GridViewColumn Header="Techs" DisplayMemberBinding="{Binding TechCount}" />
        </GridView>
    </ListView.View>
</ListView>

在圖片中查看相關代碼更容易，所以我正在做一個簡短的屏幕，而不是原始代碼

當我單擊UI上的+按鈕時，將運行第26行。 TechCount具有與CheckIn類似的實現，后者僅引用Labor中的字段。

這是完整的viewmodel代碼：

public class ServiceItemsViewModel : ViewModelBase
{
    public Labor Labor { get; set; }
    public ObservableCollection<Labor> LaborItems { get; private set; } = new ObservableCollection<Labor>();

public ServiceItemsViewModel()
{
    Labor = new Labor();
    Labor.Rates = new LaborRatesDual();
    AddLaborCommand = new DelegateCommand(addLabor, null);
}

public ICommand AddLaborCommand { get; private set; }

private void addLabor(object obj)
{
    LaborItems.Add(Labor);
    Labor = new Labor();
}

private bool canAddLabor(object arg)
{
    if (Labor.Duration.Minutes < 1)
    {
        return false;
    }

    //if (AdditionalBillingRate <= 0 || AdditionalPayoutRate <= 0)
    //{
    //    return false;
    //}

    return true;
}

public DateTime CheckIn
{
    get { return Labor.Time.CheckIn; }
    set
    {
        Labor.Time.CheckIn = value;
        RaisePropertyChanged(nameof(Labor));
    }
}
public DateTime CheckOut
{
    get { return Labor.Time.CheckOut; }
    set
    {
        Labor.Time.CheckOut = value;
        RaisePropertyChanged(nameof(Labor));
        ((DelegateCommand)AddLaborCommand).RaiseCanExecuteChanged();
    }
}
public int TechCount
{
    get { return Labor.TechCount; }
    set
    {
        Labor.TechCount = value;
        RaisePropertyChanged(nameof(Labor));
    }
}
public decimal InitialPayoutRate
{
    get { return Labor.Rates.InitialPayoutRate; }
    set
    {
        Labor.Rates.InitialPayoutRate = value;
        RaisePropertyChanged(nameof(Labor));
        //((DelegateCommand)AddLaborCommand).RaiseCanExecuteChanged();
    }
}
public decimal AdditionalPayoutRate
{
    get { return Labor.Rates.AdditionalPayoutRate; }
    set
    {
        Labor.Rates.AdditionalPayoutRate = value;
        RaisePropertyChanged(nameof(Labor));
        //((DelegateCommand)AddLaborCommand).RaiseCanExecuteChanged();
    }
}
public decimal InitialBillingRate
{
    get { return Labor.Rates.InitialBillingRate; }
    set
    {
        Labor.Rates.InitialBillingRate = value;
        RaisePropertyChanged(nameof(Labor));
        //((DelegateCommand)AddLaborCommand).RaiseCanExecuteChanged();
    }
}
public decimal AdditionalBillingRate
{
    get { return Labor.Rates.AdditionalBillingRate; }
    set
    {
        Labor.Rates.AdditionalBillingRate = value;
        RaisePropertyChanged(nameof(Labor));
        //((DelegateCommand)AddLaborCommand).RaiseCanExecuteChanged();
    }
}

private Labor selectedLaborItem;
public Labor SelectedLaborItem
{
    get { return selectedLaborItem; }
    set
    {
        selectedLaborItem = value;
        RaisePropertyChanged(nameof(Labor));
    }
}

單擊+按鈕后的人工內容：

Answer 1

您的列綁定是錯誤的：

<GridViewColumn Header="#" Width="55" DisplayMemberBinding="{Binding **Labor.**WorkOrderNo}"/>
<GridViewColumn Header="Date" Width="100" DisplayMemberBinding="{Binding **Labor.**Time.CheckIn}"/>
<GridViewColumn Header="Techs" DisplayMemberBinding="{Binding TechCount}" />

請參閱上面的星號區域。

Answer 2

您已經綁定了勞工組

ItemsSource="{Binding LaborItems}" 

勞動不是勞動的財產

<GridViewColumn Header="#"    Width="55"  DisplayMemberBinding="{Binding WorkOrderNo}"/>
<GridViewColumn Header="Date" Width="100" DisplayMemberBinding="{Binding Time.CheckIn}"/>