c#数据绑定（3）——数据转化为信息
2024-08-28 00:59:57
文/嶽永鹏
本文主要在数据绑定1和2中新增了DataSet对象，练习了如何在DataSet中添加表、关系和约束，同时本文也简要的介绍了如何将数据转化为信息。
目标界面：
XAML代码：
<Grid Margin="2">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition />
</Grid.RowDefinitions>
<GroupBox Header="Customer" Grid.Row="0" Padding="5">
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="CustomerID" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="0" Grid.Column="1" Margin="2" Name="tbxCustomerID" Text="{Binding Path=CID}"/>
<TextBlock Grid.Row="1" Grid.Column="0" Text="CustomerName" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="1" Grid.Column="1" Margin="2" Name="tbxCustomerName" Text="{Binding Path=Name}"/>
<Button Grid.Row="2" Grid.Column="1" Content="Add New Customer" Margin="2" Name="btnAddCustomer" Padding="2" Click="btnAddCustomer_Click" />
</Grid>
</GroupBox>
<GroupBox Header="Order" Grid.Row="1" Padding="5">
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="OrderID" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="0" Grid.Column="1" Margin="2" Name="tbxOrderID" Text="{Binding Path=OID}"/>
<TextBlock Grid.Row="1" Grid.Column="0" Text="OrderName" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="1" Grid.Column="1" Margin="2" Name="tbxOrderName" Text="{Binding Path=Customer}"/>
<TextBlock Grid.Row="2" Grid.Column="0" Text="Subtotal" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="2" Grid.Column="1" Margin="2" Name="tbxSubtotal" Text="{Binding Path=Subtotal}"/>
<TextBlock Grid.Row="3" Grid.Column="0" Text="TaxRate" Margin="2" HorizontalAlignment="Right" VerticalAlignment="Center"/>
<TextBox Grid.Row="3" Grid.Column="1" Margin="2" Name="tbxTaxRate" Text="{Binding Path=TaxRate}"/>
<Button Grid.Row="4" Grid.Column="1" Content="Add New Order" Margin="2" Name="btnAddOrder" Padding="2" Click="btnAddOrder_Click" />
</Grid>
</GroupBox>
<ListView Name="lstDisplayCustomer" ItemsSource="{Binding}" Grid.Row="2" Margin="2" MinHeight="150">
<ListView.View>
<GridView>
<GridView.Columns>
<GridViewColumn Header="CustomerID" DisplayMemberBinding="{Binding CID}"/>
<GridViewColumn Header="CustomerName" DisplayMemberBinding="{Binding Name}"/>
<GridViewColumn Header="Total" DisplayMemberBinding="{Binding OrderTotals}" />
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
<ListView Name="lstDisplayOrder" ItemsSource="{Binding}" Grid.Row="3" Margin="2" MinHeight="150">
<ListView.View>
<GridView>
<GridView.Columns>
<GridViewColumn Header="OrderID" DisplayMemberBinding="{Binding OID}"/>
<GridViewColumn Header="Customer" DisplayMemberBinding="{Binding Customer}"/>
<GridViewColumn Header="Subtotal" DisplayMemberBinding="{Binding Subtotal}"/>
<GridViewColumn Header="TaxRate" DisplayMemberBinding="{Binding TaxRate}" />
<GridViewColumn Header="Total" DisplayMemberBinding="{Binding Total}"/>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
</Grid>
C# 代码：
DataSet business = NewData();
public MainWindow()
{
InitializeComponent();
}
private static DataSet NewData()
{
//-----build the parent table and add some data
DataTable customer = new DataTable("Customer");
customer.Columns.Add("CID", typeof(Int32));
customer.Columns.Add("Name", typeof(string));
//-------build the child table and add some data.
DataTable orders = new DataTable("Order");
orders.Columns.Add("OID", typeof(int));
orders.Columns.Add("Customer", typeof(Int32));
orders.Columns.Add("Subtotal", typeof(decimal));
orders.Columns.Add("TaxRate", typeof(decimal));
orders.Columns.Add("Total",typeof(decimal),"Subtotal*(1+TaxRate)");
//-----Link the table within a Dataset.
DataSet business = new DataSet();
business.Tables.Add(customer);
business.Tables.Add(orders);
business.Relations.Add(customer.Columns["CID"],orders.Columns["Customer"]);
customer.Columns.Add("OrderTotals" ,typeof(decimal),"Sum(Child.Total)");
return business;
}
private void btnAddCustomer_Click(object sender, RoutedEventArgs e)
{
//Vist datatable customer.
DataTable customer=business.Tables["Customer"];
NewMember(customer);
lstDisplayCustomer.DataContext = customer;
}
private DataTable NewMember(DataTable table)
{
DataRow newRow = table.NewRow();
newRow["CID"] = tbxCustomerID.Text;
newRow["Name"] = tbxCustomerName.Text;
table.Rows.Add(newRow);
return table;
}
private DataTable NewMemberOrder(DataTable table)
{
DataRow newRow = table.NewRow();
newRow["OID"] = tbxOrderID.Text;
newRow["Customer"] = tbxOrderName.Text;
newRow["Subtotal"] = tbxSubtotal.Text;
newRow["TaxRate"] = tbxTaxRate.Text;
table.Rows.Add(newRow);
return table;
}
private void btnAddOrder_Click(object sender, RoutedEventArgs e)
{
//Vist datatable order.
DataTable order = business.Tables["Order"];
NewMemberOrder(order);
lstDisplayOrder.DataContext = order;
}
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