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Artyom's questions

Martin Hope
Artyom
Asked: 2020-10-27 19:18:56 +0000 UTC
  • 2

您需要在DataGrid 其中显示数据库中的信息。例如我有一个类：

public partial class Orders
    {
        public Orders()
        {
            this.CustomersOrders = new HashSet<CustomersOrders>();
            this.OrdersProducts = new HashSet<OrdersProducts>();
        }

        public int order_id { get; set; }
        public Nullable<int> order_prodCount { get; set; }
        public string order_dateils { get; set; }
        public string order_status { get; set; }
        public System.DateTime order_date { get; set; }

        public virtual ICollection<CustomersOrders> CustomersOrders { get; set; }
        public virtual ICollection<OrdersProducts> OrdersProducts { get; 

set; }
}

一个类Orders与一个 类相关，Customers并Products通过多对多关系

  public partial class CustomersOrders
    {
        public int customersOrders_id { get; set; }
        public Nullable<int> order_id { get; set; }
        public Nullable<int> cust_id { get; set; }

        public virtual Customers Customers { get; set; }
        public virtual Orders Orders { get; set; }
    }

和

  public partial class OrdersProducts
    {
        public int ordersProducts_id { get; set; }
        public Nullable<int> order_id { get; set; }
        public Nullable<int> prod_id { get; set; }

        public virtual Orders Orders { get; set; }
        public virtual Products Products { get; set; }
    }

我如何输出Products和Customers，特别prod_name是从Products和custom_name custom_Surname从Customers 到我DataGrid的位置 order_dateils, order_status, order_date 以及如何将所有这些与连接起来XAML？

<DataGrid.Columns>
  <DataGridTextColumn Header="Product" Binding="{Binding .....???}"/>
  <DataGridTextColumn Header="Customer" Binding="{Binding .....???}"/>
  <DataGridTextColumn Header="Status" Binding="{Binding order_status}"/>
  <DataGridTextColumn Header="Dateils" Binding="{Binding order_dateils}"/>
  <DataGridTextColumn Header="Order Date" Binding="{Binding order_date}"/>
</DataGrid.Columns>
c#
Martin Hope
Artyom
Asked: 2020-10-27 01:08:06 +0000 UTC
  • 2

有一个 ComboBox，您需要在其中显示来自两个字段 (cust_name 和cust_Surname) 的信息。原来只是耙出来的cust_name。如何 在一行中显示cust_name 和？cust_Surname

 <ComboBox x:Name="Customer"
              Grid.Column="1" 
              Grid.Row="1"
              IsReadOnly="True"
              DisplayMemberPath="cust_name"  
              ItemsSource="{Binding Customers}" 
              SelectedItem="{Binding SelectedElementCustomers}"
              Style="{StaticResource ComboBoxStyle}"
              BorderBrush="{StaticResource brushWatermarkBorder}"/>

谢谢！

c#
Martin Hope
Artyom
Asked: 2020-09-19 14:29:51 +0000 UTC
  • 3

大家好：）
朋友们，请告诉我，如果我将一个对象的引用传递给一个方法，有什么联系？

public void Method(MyClass my) // какая связь?
{
    //..
}

可以的话请发链接！

组成很清楚。

public class ElectricEngine { }

public class Car
{
    ElectricEngine engine;
    public Car()
    {
        engine = new ElectricEngine();
    }
}

聚合

public abstract class Engine
{ }

public class Car
{
    Engine engine;
    public Car(Engine eng)
    {
        engine = eng;
    }
}

协会

class Team
{

}
class Player
{
    public Team Team { get; set; }
}

继承和实现 - 也不会引起问题）

c#