使用linq返回具有列表＜oboct＞成员的对象

本文是小编为大家收集整理的关于使用linq返回具有列表<oboct>成员的对象的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。

中文
English

问题描述

我仍然是Linq到SQL的新事物.我正在寻找一种使用单个LINQ查询来获取对象的所有成员的方法.我遇到的问题是，一类成员是自定义对象的列表.它是这样的:

类:

public class RoomConfiguration
{
    public int ConfigID {get;set;}
    public string ConfigName { get; set; }
    public int RowCount { get; set; }
    public int ColCount { get; set; }
    public int FillDirection { get; set; }
    public string BigDoor { get; set; }
    public string SmallDoor { get; set; }
    public List<LineConfig> Lines { get; set; }
}

我正在寻找一个LINQ查询，该查询将填充此类的所有成员，包括行.线的数据来自我也定义了一个类的另一个表.

感谢任何可能有解决方案的人.帮助您非常感谢！

推荐答案

有点困难，不知道您的桌子如何相关，但是您可以做到这一点:

var configs = db.RoomConfigurations
                .Select( r => new RoomConfiguration
                 {
                     ConfigID = r.ConfigID,
                     ConfigName = r.ConfigName,
                     ...
                     Lines = db.LineConfigs
                               .Where( l => l.RoomConfigID == r.ConfigID )
                               .ToList()
                 });

或

var configs = db.RoomConfigurations
                .Join( db.LineConfigs, r => r.ConfigID, l => l.RoomConfigID, (r,l) => new { RoomConfig = r, LineConfigs = l } )
                .GroupBy( j => j.RoomConfig )
                .Select( g => new RoomConfiguration
                 {
                     ConfigID = g.Key.ConfigID,
                     ConfigName = g.Key.ConfigName,
                     ...
                     Lines = g.LineConfigs.ToList()
                 });

本文地址：https://www.itbaoku.cn/post/1556963.html

百度翻译此文有道翻译此文

问题描述

I am still somewhat new to Linq to SQL. I am looking for a way to get all members of an object by using a single linq query. The problem I haev run into is that one of the class members is a list of custom objects. It goes something like this:

Class:

public class RoomConfiguration
{
    public int ConfigID {get;set;}
    public string ConfigName { get; set; }
    public int RowCount { get; set; }
    public int ColCount { get; set; }
    public int FillDirection { get; set; }
    public string BigDoor { get; set; }
    public string SmallDoor { get; set; }
    public List<LineConfig> Lines { get; set; }
}

I am looking for a linq query that will fill in all of the members of this class, including Lines. The data for Lines comes from another table which I have defined a class for as well.

Thank you to anyone who may have a solution for this. Help is much appreciated!

推荐答案

It's a little hard, not knowing how your tables relate, but you could do this:

var configs = db.RoomConfigurations
                .Select( r => new RoomConfiguration
                 {
                     ConfigID = r.ConfigID,
                     ConfigName = r.ConfigName,
                     ...
                     Lines = db.LineConfigs
                               .Where( l => l.RoomConfigID == r.ConfigID )
                               .ToList()
                 });

var configs = db.RoomConfigurations
                .Join( db.LineConfigs, r => r.ConfigID, l => l.RoomConfigID, (r,l) => new { RoomConfig = r, LineConfigs = l } )
                .GroupBy( j => j.RoomConfig )
                .Select( g => new RoomConfiguration
                 {
                     ConfigID = g.Key.ConfigID,
                     ConfigName = g.Key.ConfigName,
                     ...
                     Lines = g.LineConfigs.ToList()
                 });

上一篇：C#: 获取带有所有父标签的XML节点内容

下一篇：Linq Any()的副作用