Linq集团由和总和问题

我有以下实体:

包含订阅列表的帐户类:

public class Account
{
    /// 

    /// Account ID
    /// 
    public string ID { get; set; }

    /// 

    /// A List with all subscriptions
    /// 
    public IEnumerable Subscriptions { get; set; }
}

包含变体列表和附加内容的订阅类:

public class Subscription
{
    /// 

    /// Subscription ID
    /// 
    public string ID { get; set; }

    /// 

    /// Quantity of the subscription.
    /// 
    public int Quantity { get; set; }

    /// 

    /// A list with all subscription add ons
    /// 
    public IEnumerable AddOns { get; set; }

    /// 

    /// A List with all subscription variations
    /// 
    public IEnumerable Variations { get; set; }
}

带有变体列表的类添加:

public class AddOn
{
    /// 

    /// Gets or Sets add on id
    /// 
    public string ID { get; set; }

    /// 

    /// Quantity of the add on.
    /// 
    public int Quantity { get; set; }

    /// 

    /// A List with all add on variations
    /// 
    public IEnumerable Variations { get; set; }

}

变异类:

public class Variation
{
    /// 

    /// Variation ID
    /// 
    public string ID { get; set; }

    /// 

    /// offerUri
    /// 
    public string Code { get; set; }

    /// 

    /// Variation Value
    /// 
    public string Value { get; set; }

    /// 

    /// Variation Name
    /// 
    public string Name { get; set; }

}

我要做的是将所有附加组件与特定代码分组并对数量求和.例如我试过:

var groupAddOnsByCode = acc.Subscriptions.Select(s => s.AddOns.GroupBy(a => a.Variations.Select(v => v.Code).FirstOrDefault())).ToList();

这是一个正确的组添加,但我想要一个列表,每个订阅组添加ons代码和每个代码的总数量.

例如,如果订阅具有X个附加组件,并且每个添加的代码是1,2,...,X,我想按代码添加分组和使用此代码的总数量.我希望结果会像我有以下结构:

具有当前结构的伪代码(代码是指每个添加的变体类):

Subscription {
 //a list with X number of add ons
 AddOn1 = { Variation = { Code = 1 }, Quantity = 2 },
 AddOn2 = { Variation = { Code = 2 }, Quantity = 3 },
 ...
 AddOnX = { Variation = { Code = X }, Quantity = 4 }
}

我期待的是:

Subscription {
    AddOn1 { Variation = { Code = 1 }, Quantity = totalAmountOfQuantityForAddOnsWithCode = 1 },
    ...
    AddOnX { Variation = { Code = X }, Quantity = totalAmountOfQuantityForAddOnsWithCode = X },
}

您可以使用此dotnetfiddle来测试虚拟数据.

对不起,长篇文章,我将不胜感激任何帮助.还要记住我的c#和Linq知识是有限的.

如果我理解正确,以下可能会产生所需的结果

var result = acc.Subscriptions.Select(s => new
{
    Subscription = s,
    AddOns = s.AddOns.SelectMany(a => a.Variations, (a, v) => new { a, v })
        .GroupBy(e => e.v.Code, (key, elements) => new 
        { 
            Code = key,
            Quantity = elements.Sum(e => e.a.Quantity)
        }).ToList()
}).ToList();