3

我不确定刚刚发生了什么，为什么今天早上我运行了我的项目并开始导致 System.ArgumentException 错误。也许我昨​​晚改变了一些东西，我又半睡半醒了。

我尝试寻找答案，它让我知道在财产中具有相同的名称？

我扫描了我的代码，它看起来和上次成功运行的代码一样......奇怪......

也许您可以帮助我寻找错误并启发我。

基本上错误是在这段代码中引起的

lvSubmeters.ItemsSource = this.store

在这段代码中

public MainPage()
{
    this.InitializeComponent();
    this.InitializeControlEvents();
    this.InitializeControls();
}

void InitializeControls()
{
    store = new DataStore();
    store.AllItems = new System.Collections.ObjectModel.ObservableCollection<ItemFields>();
    PopulateTempData();

    lvSubmeters.ItemsSource = this.store;
}

这是我的 PopulateTempData

void PopulateTempData()
{
    txCurrentBill.Text = "5308.07";
    txKwHUsed.Text = "710";
    txTotalAdditonalCharges.Text = "249.1";
    ComputeKwhPerSubmeter(txTotalAdditonalCharges, null);

    RefreshListView(new ItemFields()
    {
        MeterID = "1234",
        Fullname = "XOP",
        LastReading = 22980,
        NewReading = 23107,
        KwhPerSubmeter = Convert.ToDouble(txKwHPerSub.Tag),
        AdditionalCharges = Convert.ToDouble(txChargeForEachSubmeters.Tag)
    });
    RefreshListView(new ItemFields()
    {
        MeterID = "2345",
        Fullname = "Bigasan",
        LastReading = 0,
        NewReading = 0,
        KwhPerSubmeter = Convert.ToDouble(txKwHPerSub.Tag),
        AdditionalCharges = Convert.ToDouble(txChargeForEachSubmeters.Tag)
    });
    RefreshListView(new ItemFields()
    {
        MeterID = "3456",
        Fullname = "Store",
        LastReading = 0,
        NewReading = 0,
        KwhPerSubmeter = Convert.ToDouble(txKwHPerSub.Tag),
        AdditionalCharges = Convert.ToDouble(txChargeForEachSubmeters.Tag)
    });
    RefreshListView(new ItemFields()
    {
        MeterID = "4567",
        Fullname = "Social & Play",
        LastReading = 7056,
        NewReading = 7511,
        KwhPerSubmeter = Convert.ToDouble(txKwHPerSub.Tag),
        AdditionalCharges = Convert.ToDouble(txChargeForEachSubmeters.Tag)
    });
    RefreshListView(new ItemFields()
    {
        MeterID = "5678",
        Fullname = "Parlor",
        LastReading = 8277,
        NewReading = 8365,
        KwhPerSubmeter = Convert.ToDouble(txKwHPerSub.Tag),
        AdditionalCharges = Convert.ToDouble(txChargeForEachSubmeters.Tag)
    });
}

这是 ItemFields 模型

using System;

namespace ElectricSubmeterBillComputation.Models
{
    using System.ComponentModel;

    public class ItemFields : System.ComponentModel.INotifyPropertyChanged
    {
        string _meter_id = string.Empty;
        public string MeterID
        {
            get { return this._meter_id; }
            set
            {
                if (_meter_id != value)
                {
                    _meter_id = value;
                    NotifyPropertyChanged("MeterID");
                }
            }
        }

        string _fullname = string.Empty;
        public string Fullname
        {
            get { return this._fullname; }
            set
            {
                if (this._fullname != value)
                {
                    this._fullname = value;
                    NotifyPropertyChanged("Fullname");
                }
            }
        }

        int _lastreading = 0;
        public int LastReading
        {
            get { return this._lastreading; }
            set
            {
                if (this._lastreading != value)
                {
                    this._lastreading = value;
                    NotifyPropertyChanged("LastReading");
                }
            }
        }

        int _newreading = 0;
        public int NewReading
        {
            get { return this._newreading; }
            set
            {
                if (this._newreading != value)
                {
                    this._newreading = value;
                    NotifyPropertyChanged("NewReading");
                }
            }
        }

        int _kwhused = 0;
        public int KwHUsed
        {
            get { return this._kwhused; }
            set
            {
                if (this._kwhused != value)
                {
                    this._kwhused = value;
                    NotifyPropertyChanged("KwHUsed");
                }
            }
        }

        double _KwHPerSubmeter = 0.0;
        public double KwhPerSubmeter
        {
            get { return this._KwHPerSubmeter; }
            set
            {
                if (this._KwHPerSubmeter != value)
                {
                    this._KwHPerSubmeter = value;
                    NotifyPropertyChanged("KwhPerSubmeter");
                }
            }
        }

        double _kwhamount = 0.0;
        public double KwhUsedAmount
        {
            get { return this._kwhamount; }
            set
            {
                if (this._kwhamount != value)
                {
                    this._kwhamount = value;    
                    NotifyPropertyChanged("KwhUsedAmount");
                }
            }
        }

        double _add_charge = 0.0;
        public double AdditionalCharges
        {
            get { return this._add_charge; }
            set
            {
                if (this._add_charge != value)
                {
                    this._add_charge = value;
                    NotifyPropertyChanged("AdditionalCharges");
                }
            }
        }

        double _total_amount = 0.0;
        public double TotalAmount
        {
            get { return this._total_amount; }
            set
            {
                if (this._total_amount != value)
                {
                    this._total_amount = value;
                    NotifyPropertyChanged("TotalAmount");
                }
            }
        }

        public void Update()
        {
            KwHUsed = NewReading - LastReading;
            KwhUsedAmount = KwHUsed * KwhPerSubmeter;
            TotalAmount = KwhUsedAmount + AdditionalCharges;
        }

        #region INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }
        #endregion
    }
}

这是数据存储模型

using System;
using System.Collections.ObjectModel;

namespace ElectricSubmeterBillComputation.Models
{
    using System.ComponentModel;

    public class DataStore : INotifyPropertyChanged
    {
        ObservableCollection<ItemFields> _allItems;
        public ObservableCollection<ItemFields> AllItems
        {
            get { return this._allItems; }
            set
            {
                _allItems = value;
                NotifyPropertyChanged("AllItems");
            }
        }

        public void UpdateAllAmounts(double AdditionalChargersPerSubmeter)
        {
            foreach (ItemFields item in _allItems)
            {
                item.AdditionalCharges = AdditionalChargersPerSubmeter;
                item.Update();
            }
        }

        #region INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }
        #endregion
    }
}

最后，我的列表视图

<ListView Grid.Row="3" x:Name="lvSubmeters" ItemTemplate="{StaticResource SubmeterItems}" VerticalAlignment="Top" HorizontalAlignment="Stretch" SelectionChanged="lvSubmeters_SelectionChanged">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

和 SubmeterItems 模板

<DataTemplate x:Name="SubmeterItems">
    <Grid VerticalAlignment="Top" HorizontalAlignment="Stretch"  Margin="5,5,5,5">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="166"/>
            <ColumnDefinition Width="100*"/>
            <ColumnDefinition Width="200"/>
        </Grid.ColumnDefinitions>
        <StackPanel Grid.Column="0" VerticalAlignment="Top">
            <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="{Binding MeterID}" FontSize="24"  FontWeight="Bold" Foreground="#FF429AA3" />
            <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="{Binding Fullname}" FontSize="16"  />
        </StackPanel>
        <StackPanel Grid.Column="1" VerticalAlignment="Top" Height="95">
            <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text=" " FontSize="24"  FontWeight="Bold" Foreground="#FF429AA3" />
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="100"/>
                    <ColumnDefinition Width="29*"/>
                </Grid.ColumnDefinitions>
                <StackPanel Grid.Column="0">
                    <TextBlock Grid.Column="0" VerticalAlignment="Top" Text="Last Reading:" FontSize="14" Margin="0,0,5,5"  />
                    <TextBlock Grid.Column="0" VerticalAlignment="Top" Text="New Reading:" FontSize="14" Margin="0,0,5,5"  />
                    <TextBlock Grid.Column="0" VerticalAlignment="Top" Text="KW/H Used:" FontSize="14" Margin="0,0,5,5"  />
                </StackPanel>
                <StackPanel Grid.Column="1">
                    <TextBlock Grid.Column="1" VerticalAlignment="Top" Text="{Binding LastReading}" FontSize="14" Margin="0,0,5,5" FontWeight="Bold"  />
                    <TextBlock Grid.Column="1" VerticalAlignment="Top" Text="{Binding NewReading}" FontSize="14" Margin="0,0,5,5" FontWeight="Bold"  />
                    <TextBlock Grid.Column="1" VerticalAlignment="Top" Text="{Binding KwHUsed}" FontSize="14" Margin="0,0,5,5" FontWeight="Bold"  />
                </StackPanel>
            </Grid>
        </StackPanel>

        <StackPanel Grid.Column="2" VerticalAlignment="Bottom" HorizontalAlignment="Stretch" Background="Black">
            <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="{Binding KwhUsedAmount}" FontSize="20"  FontWeight="Bold" Foreground="Red" TextAlignment="Right" Margin="0,0,5,0" />
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="+" FontSize="20" Foreground="#99FF0000" TextAlignment="Right"  Margin="0,0,5,0"/>
                <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="{Binding AdditionalCharges}" FontSize="20" Foreground="#99FF0000" TextAlignment="Right"  Margin="0,0,5,0"/>
            </StackPanel>
            <TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Top" Text="{Binding TotalAmount}" FontSize="34" FontWeight="Bold" Foreground="Green" TextAlignment="Right"  Margin="0,0,5,0" />
        </StackPanel>
    </Grid>
</DataTemplate>

最后是堆栈跟踪

   at Windows.UI.Xaml.Controls.ItemsControl.put_ItemsSource(Object value)
   at ElectricSubmeterBillComputation.MainPage.InitializeControls() in d:\Codes\WindowsMetro\ElectricSubmeterBillComputation\ElectricSubmeterBillComputation\MainPage.xaml.cs:line 43
   at ElectricSubmeterBillComputation.MainPage..ctor() in d:\Codes\WindowsMetro\ElectricSubmeterBillComputation\ElectricSubmeterBillComputation\MainPage.xaml.cs:line 33
   at ElectricSubmeterBillComputation.ElectricSubmeterBillComputation_XamlTypeInfo.XamlTypeInfoProvider.Activate_1_MainPage() in d:\Codes\WindowsMetro\ElectricSubmeterBillComputation\ElectricSubmeterBillComputation\obj\Debug\XamlTypeInfo.g.cs:line 121
   at ElectricSubmeterBillComputation.ElectricSubmeterBillComputation_XamlTypeInfo.XamlUserType.ActivateInstance() in d:\Codes\WindowsMetro\ElectricSubmeterBillComputation\ElectricSubmeterBillComputation\obj\Debug\XamlTypeInfo.g.cs:line 277
4

1 回答 1

2

解决了..

lvSubmeters.ItemsSource = this.store;

它应该是

lvSubmeters.ItemsSource = this.store.AllItems;



所以为了制作上面的第一个代码

lvSubmeters.DataContext = this.store;

ListView 应该有

ItemsSource="{Binding AllItems}"
于 2012-06-22T02:40:48.503 回答