[英]C# binding Questions
我有以下代码。 我的总计显示在 wpf 上,但是当我尝试计算我的小计时,它不起作用。 即使我的屏幕显示总字段的值,也只需返回 0。 我已经厌倦了直接在屏幕上引用 Total1 字段,但这也不起作用。 需要得到一个小计,然后计算税收和总计。 有任何想法吗? 我只是看不到我错过了什么。
c#
private string total1;
private string total2;
private string total3;
private string total4;
public string Total1
{
get
{
//string ProdId = ((ComboBoxItem)Product1.SelectedItem).Tag;
double qty1;
bool good = double.TryParse(quantity1, out qty1);
if (!(good)) qty1 = 0.0;
double len1;
bool good2 = double.TryParse(length1, out len1);
if (!(good2)) len1 = 0.0;
double pri1;
bool good3 = double.TryParse(price1, out pri1);
if (!(good3)) pri1 = 0.0;
double res = qty1 * len1 * pri1;
total1 = res.ToString();
return total1;
}
set
{
double qty1;
bool good = double.TryParse(quantity1, out qty1);
if (!(good)) qty1 = 0.0;
double len1;
bool good2 = double.TryParse(length1, out len1);
if (!(good2)) len1 = 0.0;
double pri1;
bool good3 = double.TryParse(price1, out pri1);
if (!(good3)) pri1 = 0.0;
double res = qty1 * len1 * pri1;
total1 = res.ToString();
OnPropertyChanged("Total1");
OnPropertyChanged("SubTotal");
}
}
public string SubTotal
{
get
{
double t1;
bool good = double.TryParse(total1, out t1);
if (!(good)) t1 = 0.0;
double t2;
bool good2 = double.TryParse(total2, out t2);
if (!(good2)) t2 = 0.0;
double t3;
bool good3 = double.TryParse(total3, out t3);
if (!(good3)) t3 = 0.0;
double t4;
bool good4 = double.TryParse(total4, out t4);
if (!(good4)) t4 = 0.0;
double res = t1 + t2 + t3 + t4;
return res.ToString();
}
set
{
double t1;
bool good = double.TryParse(total1, out t1);
if (!(good)) t1 = 0.0;
double t2;
bool good2 = double.TryParse(total2, out t2);
if (!(good2)) t2 = 0.0;
double t3;
bool good3 = double.TryParse(total3, out t3);
if (!(good3)) t3 = 0.0;
double t4;
bool good4 = double.TryParse(total4, out t4);
if (!(good4)) t4 = 0.0;
double res = t1 + t2 + t3 + t4;
subTotal = res.ToString();
OnPropertyChanged("SubTotal");
OnPropertyChanged("TaxTotal");
OnPropertyChanged("GrandTotal");
}
}
Xaml
<TextBox Grid.Column="11" Grid.Row="2" Width="80" Name="Total1" Height="24"
TextAlignment="Right" FontFamily="Arial" HorizontalAlignment="Center" IsReadOnly="True"
Text="{Binding Path=Total1, Mode=TwoWay}" />
<TextBox Grid.Column="7" Grid.Row="16" Width="80" Name="SubTotal" FontFamily="Arial"
TextAlignment="Right" Height="24" HorizontalAlignment="Center" IsReadOnly="True"
Text="{Binding Path=SubTotal, Mode=TwoWay}" />
有些事
这应该工作
public abstract class ObservableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
protected virtual void SetValue<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
{
field = value;
OnPropertyChanged(propertyName);
}
}
class ViewModel : ObservableObject
{
private int _quantity;
public int Quantity { get { return _quantity; } set { SetValue(ref _quantity, value); OnPropertyChanged(nameof(Total)); } }
private decimal _length;
public decimal Length { get { return _length; } set { SetValue(ref _length, value); OnPropertyChanged(nameof(Total)); } }
private decimal _price;
public decimal Price { get { return _price; } set { SetValue(ref _price, value); OnPropertyChanged(nameof(Total)); } }
public decimal Total => Quantity * Length * Price;
}
Xaml
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="80"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Grid.Column="0" Grid.Row="0" Text="Quantity"/>
<TextBox Grid.Column="1" Grid.Row="0" TextAlignment="Right"
Text="{Binding Quantity, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Grid.Column="0" Grid.Row="1" Text="Length"/>
<TextBox Grid.Column="1" Grid.Row="1" TextAlignment="Right"
Text="{Binding Length, UpdateSourceTrigger=PropertyChanged, StringFormat=#.##}" />
<TextBlock Grid.Column="0" Grid.Row="2" Text="Price"/>
<TextBox Grid.Column="1" Grid.Row="2" TextAlignment="Right"
Text="{Binding Price, UpdateSourceTrigger=PropertyChanged, StringFormat=#.##}" />
<TextBlock Grid.Column="0" Grid.Row="3" Text="Total"/>
<TextBox Grid.Column="1" Grid.Row="3" TextAlignment="Right" IsReadOnly="True"
Text="{Binding Total, Mode=OneWay, StringFormat=#.##}"/>
</Grid>
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