如何使用数据绑定在不同的表上创建 Treeview

Question

我想创建一个树视图，第一级绑定到 "Customer" (id int, name nvarchar, surname nvarchar) 并且子节点绑定到其他表 "Order" (customer_id int, id int, o_date date, code nvarchar) 和另一个 "Cases" (customer_id int, id int, c_date date, issue nvarchar).

如果在客户中我有

ID Name Surname
1  Joe  Doe
2  Jim  White

并按顺序

Customer_ID ID o_date       code
1           1  01/01/2019   o001
1           2  01/01/2019   o002
2           3  01/01/2019   o003

案例

Customer_ID ID c_date       code
2           1  01/01/2019   issue 001

我希望看到

Joe Doe
  - o001
  - o002
Jim White
  - o003
  + issue 001

Answer 1

您需要加入table。也可能需要使用 Left Outer Join。参见：https://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable customerTable = new DataTable();
            customerTable.Columns.Add("ID", typeof(int));
            customerTable.Columns.Add("Name", typeof(string));
            customerTable.Columns.Add("Surname", typeof(string));

            customerTable.Rows.Add(new object[] {1, "Joe", "Doe"});
            customerTable.Rows.Add(new object[] {2, "Jim", "White"});

            DataTable orderTable = new DataTable();
            orderTable.Columns.Add("Customer_ID", typeof(int));
            orderTable.Columns.Add("ID", typeof(int));
            orderTable.Columns.Add("o_date", typeof(DateTime));
            orderTable.Columns.Add("code", typeof(string));

            orderTable.Rows.Add(new object[] {1, 1, DateTime.Parse("01/01/2019"), "o001"});
            orderTable.Rows.Add(new object[] {1, 2, DateTime.Parse("01/01/2019"), "o002"});
            orderTable.Rows.Add(new object[] {2, 3, DateTime.Parse("01/01/2019"), "o003"});

            DataTable caseTable = new DataTable();
            caseTable.Columns.Add("Customer_ID", typeof(int));
            caseTable.Columns.Add("ID", typeof(int));
            caseTable.Columns.Add("o_date", typeof(DateTime));
            caseTable.Columns.Add("code", typeof(string));

            caseTable.Rows.Add(new object[] {2, 1, DateTime.Parse("01/01/2019"), "issue 001"});

            var results = (from cust in customerTable.AsEnumerable()
                           join order in orderTable.AsEnumerable() on cust.Field<int>("ID") equals order.Field<int>("ID")
                           join caseT in caseTable.AsEnumerable() on cust.Field<int>("ID") equals caseT.Field<int>("ID")
                           select new { cust = cust, order = order, caseT = caseT })
                           .ToList();
        }

    }
}

如何使用数据绑定在不同的表上创建 Treeview

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