Question

我正在使用树控件，要求将数据展平后再将其交给控件。我已经尝试了各种在线示例，但无法完全“平整”数据。

设备的电表很多
结果列表必须是DeviceHierarchyDataItem的（拼合）列表

类似代码的样子：
我猜我在这儿走错了路...

public IQueryable<DeviceHierarchyDataItem> Query(int circuitConnectId)
{
    var devices = (from device in UnitOfWork.Device
                   join deviceCircuit in UnitOfWork.DeviceCircuit on device.Id equals deviceCircuit.DeviceId
                   where
                        deviceCircuit.CircuitConnectId == circuitConnectId
                   select device)
                   .Include( x=> x.Meters);

    // Not sure what to do NEXT (previous attempts have failed)
}

类：

public class DeviceHierarchyDataItem
{
    public int Id { get; set; } //<-- the 'Id' of the Device or Meter

    public int? ChildOf { get; set; }  //<-- the 'Id' of the PARENT Device or NULL

    public int CircuitConnectId { get; set; }

    public string DisplayName { get; set; } //<-- the 'Name' of the Device or Meter
}

public class Device
{
    public int Id { get; set; }

    public string DeviceName { get; set; }

    public List<Meter> Meters { get; set; }
}

public class Meter
{
    public int Id { get; set; }

    public string MeterName { get; set; }
}

Answer 1

您可以使用SelectMany展平集合的集合。

var devices = (from device in UnitOfWork.Device
               join deviceCircuit in UnitOfWork.DeviceCircuit on device.Id equals deviceCircuit.DeviceId
               where
                    deviceCircuit.CircuitConnectId == circuitConnectId
               select device)
               .Include( x=> x.Meters);

var deviceHierarchyDataItems = devices
    .SelectMany(device => device.Meters.Select(meter => new DeviceHierarchyDataItem
    {
        Id = meter.Id,
        ChildOf = device.Id,
        CircuitConnectId = 0, // don't know what you need here
        DisplayName = meter.MeterName
    }))
    .Concat(devices.Select(device => new DeviceHierarchyDataItem
    {
        Id = device.Id,
        ChildOf = null,
        CircuitConnectId = 0, // don't know what you need here
        DisplayName = device.DeviceName
    }));

或者：

var deviceHierarchyDataItems = devices
    .SelectMany(device => device.Meters.Select(meter => new DeviceHierarchyDataItem
    {
        Id = meter.Id,
        ChildOf = device.Id,
        CircuitConnectId = 0, // don't know what you need here
        DisplayName = meter.MeterName
    }).Concat(new List<DeviceHierarchyDataItem>()
    {
        new DeviceHierarchyDataItem
        {
            Id = device.Id,
            ChildOf = null,
            CircuitConnectId = 0, // don't know what you need here
            DisplayName = device.DeviceName
        }
    }));

Answer 2

Dynamic Data是用于处理列表的绝佳软件包。

使用反应式树功能展平列表。找到示例here。

Answer 3

尝试以下代码：

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

namespace ConsoleApplication86
{
    class Program
    {
        static void Main(string[] args)
        {
            int circuitConnectId = 123;
            var devices = (from device in UnitOfWork.Device
                           join deviceCircuit in UnitOfWork.DeviceCircuit on device.Id equals deviceCircuit.Id
                           where
                                deviceCircuit.CircuitConnectId == circuitConnectId
                           select new { device = device, deviceCircuit = deviceCircuit })
                           .Select(x => new
                           {
                               meters = x.device.Meters.Select(y => new { deviceName = x.device.DeviceName, deviceId = x.device.Id, meterId = y.Id, meterName = y.MeterName, circuitId = x.deviceCircuit.Id, circuitDisplayName = x.deviceCircuit.DisplayName }),
                           }).ToList();


         }
    }
    public class UnitOfWork
    {
        public static List<Device> Device { get; set; }
        public static List<DeviceHierarchyDataItem> DeviceCircuit { get; set; }
    }
    public class DeviceHierarchyDataItem
    {
        public int Id { get; set; } //<-- the 'Id' of the Device or Meter

        public int? ChildOf { get; set; }  //<-- the 'Id' of the PARENT Device or NULL

        public int CircuitConnectId { get; set; }

        public string DisplayName { get; set; } //<-- the 'Name' of the Device or Meter
    }

    public class Device
    {
        public int Id { get; set; }

        public string DeviceName { get; set; }

        public List<Meter> Meters { get; set; }
    }

    public class Meter
    {
        public int Id { get; set; }

        public string MeterName { get; set; }
    }
}

使用Linq展平设备和仪表数据

3 个答案: