datagrid WPF中的计算列 [英] Calculated column in datagrid WPF
本文介绍了datagrid WPF中的计算列的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的XAML：
< Window x：Class =WpfApplication6.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：WpfApplication6
mc：Ignorable =d
Title =MainWindowHeight =350Width =525>
< Grid>
< DataGrid Name =grid>
< DataGrid.Resources>
< local：CalculatingConverter x：Key =CalculatingConverter/>
< /DataGrid.Resources>
< DataGrid.Columns>
< DataGridTextColumn Binding ={Binding Name}/>
< DataGridTextColumn Binding ={Binding Count}/>
< DataGridTextColumn Binding ={Binding Price}/>
< DataGridTextColumn
标题=总计
Binding ={Binding Converter = {StaticResource CalculatingConverter}}
/>
< /DataGrid.Columns>
< / DataGrid>
< / Grid>
这是我的代码： / p>
public partial class MainWindow：Window
{
public MainWindow（）
{
InitializeComponent（）;
列表< Item> items = new List< Item>（）;
items.Add（new Item（）{Name =Item1，Count = 2，Price = 10}）;
items.Add（new Item（）{Name =Item2，Count = 5，Price = 20}）;
this.grid.ItemsSource = items;
}
}
public class Item：INotifyPropertyChanged
{
private string name;
私人十进制价格;
private int count;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged（[CallerMemberName] string propertyName = null）
{
this.PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName））;
}
public string Name {
get
{
return this.name;
}
set
{
if（value！= name）
{
name = value;
OnPropertyChanged（）;
}
}
}
public decimal价格
{
get
{
return price;
}
set
{
if（value！= this.Price）
{
price = value;
OnPropertyChanged（）;
}
}
}
public int Count {
get
{
return count;
}
set
{
if（value！= count）
{
count = value;
OnPropertyChanged（）;
}
}
}
public decimal TotalPrice
{
get {return Price * Count; }
}
}
这是我的IConverter：
public class CalculatingConverter：IValueConverter
{
public object Convert（object value，Type targetType，object parameter ，System.Globalization.CultureInfo文化）
{
try
{
return（（Item）value）.Price *（（Item）value）.Count;
}
catch
{
return null;
}
}
public object ConvertBack（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
{
throw new NotImplementedException （）;
}
}
我该怎么做？
解决方案
最后感谢Ed Plunkett我在我的项目中实现了类和 INotifyPropertyChanged 价格和计数强制调用 OnPropertyChanged （TotalPrice）并且完美地工作：
public class Item：INotifyPropertyChanged
{
私有字符串名称;
私人十进制价格;
private int count;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged（[CallerMemberName] string propertyName = null）
{
this.PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName））;
}
public string Name {
get
{
return this.name;
}
set
{
if（value！= name）
{
name = value;
OnPropertyChanged（）;
}
}
}
public decimal价格
{
get
{
return price;
}
set
{
if（value！= this.Price）
{
price = value;
OnPropertyChanged（）;
OnPropertyChanged（TotalPrice）;
}
}
}
public int Count {
get
{
return count;
}
set
{
if（value！= count）
{
count = value;
OnPropertyChanged（）;
OnPropertyChanged（TotalPrice）;
}
}
}
public decimal TotalPrice
{
get {return Price * Count; }
}
}
I've a application with a datagrid in WPF with C#, I've 4 columns, and I need that the four column is calculated with respect to the other columns. I use IValueConverter, that works perfectly, but only calculates values of the column four when I change the row, and I need that when I change the cell 2 and 3, changes the 4 column.
This is my XAML:
<Window x:Class="WpfApplication6.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:WpfApplication6"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<DataGrid Name="grid">
<DataGrid.Resources>
<local:CalculatingConverter x:Key="CalculatingConverter" />
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}" />
<DataGridTextColumn Binding="{Binding Count}"/>
<DataGridTextColumn Binding="{Binding Price}" />
<DataGridTextColumn
Header="Total"
Binding="{Binding Converter={StaticResource CalculatingConverter}}"
/>
</DataGrid.Columns>
</DataGrid>
</Grid>
This is my code:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
List<Item> items = new List<Item>();
items.Add(new Item() { Name = "Item1", Count = 2, Price = 10 });
items.Add(new Item() { Name = "Item2", Count = 5, Price = 20 });
this.grid.ItemsSource = items;
}
}
public class Item : INotifyPropertyChanged
{
private string name;
private decimal price;
private int count;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public string Name {
get
{
return this.name;
}
set
{
if (value != name)
{
name = value;
OnPropertyChanged();
}
}
}
public decimal Price
{
get
{
return price;
}
set
{
if (value != this.Price)
{
price = value;
OnPropertyChanged();
}
}
}
public int Count {
get
{
return count;
}
set
{
if (value != count)
{
count = value;
OnPropertyChanged();
}
}
}
public decimal TotalPrice
{
get { return Price * Count; }
}
}
And this is my IConverter:
public class CalculatingConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
try
{
return ((Item)value).Price * ((Item)value).Count;
}
catch
{
return null;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
How can I do it?
解决方案
Finally thanks to Ed Plunkett i implement INotifyPropertyChangedin my item class and in Price and Count force to call to OnPropertyChanged("TotalPrice") and works perfectly:
public class Item : INotifyPropertyChanged
{
private string name;
private decimal price;
private int count;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public string Name {
get
{
return this.name;
}
set
{
if (value != name)
{
name = value;
OnPropertyChanged();
}
}
}
public decimal Price
{
get
{
return price;
}
set
{
if (value != this.Price)
{
price = value;
OnPropertyChanged();
OnPropertyChanged("TotalPrice");
}
}
}
public int Count {
get
{
return count;
}
set
{
if (value != count)
{
count = value;
OnPropertyChanged();
OnPropertyChanged("TotalPrice");
}
}
}
public decimal TotalPrice
{
get { return Price * Count; }
}
}
这篇关于datagrid WPF中的计算列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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