将组合框中的值添加到WPF中的DataGrid中

Question

我有4个组合框，每个都在下拉菜单中标记。之后，在我的代码中，我想为ComboBox设置一个if-else语句。如果选择了项目，则会根据某些值(成本、项目类型和项目名称(将其添加到DataGrid中。

组合框的XAML(此问题的缩写(

<TextBlock>Electronics:</TextBlock>

<ComboBox>
<ComboBoxItem x:Name="cmbxElectronics">
<TextBlock x:Name="txtLaptop">Laptop</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock x:Name="txtPC">PC</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock x:Name="txtStove">Stove</TextBlock>
</ComboBoxItem>
<ComboBoxItem>
<TextBlock x:Name="txtCamera">Camera</TextBlock>
</ComboBoxItem>
</ComboBox>

这是数据网格XAML代码：

<StackPanel Grid.Row="0" Grid.Column="1" Margin="5">
<DataGrid Margin="5" Height="195">
<DataGrid.Columns>
<DataGridTextColumn Header=" Item" Width="*" />
<DataGridTextColumn Header=" Type" Width="*"/>
<DataGridTextColumn Header=" Cost($)" Width="*"/>    
</DataGrid.Columns>
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Background" Value="#3280fc"/>
<Setter Property="FontWeight" Value="SemiBold"/>
<Setter Property="BorderThickness" Value="0,0,1,2"/>
<Setter Property="BorderBrush" Value="Black"/>

</Style>

</DataGrid.Resources>
</DataGrid>
</StackPanel>

最后，这里是cs文件中的代码，它为DataGrid(Invoice(和计算总数的方法创建了类(只想知道如何将ComboBox设置为DataGrid(：

private class Invoice
{
public string Item { get; set; }
public string Type { get; set; }
public double Price { get; set; }
}
private void Calculate()
{
double price = 0;
const double HST = 0.18;
if (cmbxElectronics.IsSelected)
{

}

}

一旦我找到了其中一个，剩下的就应该很简单了。如果需要更多信息，请告诉我，谢谢。

Answer 1

主要关注绑定：

<DataGrid x:Name="DataGridInvoices" ItemsSource="{Binding}"  Height="236" Width="636" AutoGenerateColumns="False" CanUserAddRows="False" >
<DataGrid.Columns >
<DataGridTextColumn Header=" Item" Width="*"  Binding="{Binding Item}"/>
<DataGridTextColumn Header=" Type" Width="*"  Binding="{Binding Type}"/>
<DataGridTextColumn Header=" Cost($)" Width="*" Binding="{Binding Price}"/>
</DataGrid.Columns>

删除重复列并删除最后一个空白行：

AutoGenerateColumns="False" CanUserAddRows="False"

Xaml:

<Window x:Class="WpfApp5.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:WpfApp5"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<TextBlock>Electronics:</TextBlock>
<StackPanel Grid.Row="0" Grid.Column="1" Margin="5">
<DataGrid x:Name="DataGridInvoices" ItemsSource="{Binding}"  Height="236" Width="636" AutoGenerateColumns="False" CanUserAddRows="False" >
<DataGrid.Columns >
<DataGridTextColumn Header=" Item" Width="*"  Binding="{Binding Item}"/>
<DataGridTextColumn Header=" Type" Width="*"  Binding="{Binding Type}"/>
<DataGridTextColumn Header=" Cost($)" Width="*" Binding="{Binding Price}"/>
</DataGrid.Columns>
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Background" Value="#3280fc"/>
<Setter Property="FontWeight" Value="SemiBold"/>
<Setter Property="BorderThickness" Value="0,0,1,2"/>
<Setter Property="BorderBrush" Value="Black"/>
</Style>
</DataGrid.Resources>
</DataGrid>
</StackPanel>
<ComboBox x:Name="ComboBox1" HorizontalAlignment="Left" Margin="298,300,0,0" VerticalAlignment="Top" Width="120" SelectionChanged="ComboBox1_SelectionChanged">
<ComboBoxItem Content="Laptop"/>
<ComboBoxItem Content="PC"/>
<ComboBoxItem Content="Stove"/>
<ComboBoxItem Content="Camera"/>
</ComboBox>
</Grid>
</Window>

代码：

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
namespace WpfApp5
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
Invoice invoice;
List<Invoice> Laptop = new List<Invoice>()
{
new Invoice(){Item ="0",Type="A",Price=10000},
new Invoice(){Item ="1",Type="B",Price=20000},
new Invoice(){Item ="2",Type="A",Price=15000},
};
public MainWindow()
{
InitializeComponent();
}
private class Invoice
{
public string Item { get; set; }
public string Type { get; set; }
public double Price { get; set; }
}
private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Intercept the selected name
string sel = ComboBox1.SelectedItem.ToString();
string Rsel = sel.Substring(sel.IndexOf(" ") + 1);
if (Rsel == "Laptop")
{
DataGridInvoices.ItemsSource = Laptop;
}
}
}
}