C#•12mo ago

Full outer join two different structures - LINQ

Hello, is it possible to do following?

class Item
{
    public DateTime Date {get; set;}
    public decimal Price {get; set;}
    public string Name {get; set;}
}

class Request
{
    public DateTime Date {get; set;}
    public decimal PayedAmount {get; set;}
}

class MergedItem
{ 
    public DateTime Date {get; set;}
    public decimal Price {get; set;}
    public string Name {get; set;}
    public decimal PayedAmount {get; set;}
}

List<Item> items;
List<Request> requests;
// How can I do something like 
var final = items.UnionOnKey(requests, "Date").Select(x => new MergedItem()
{
  Date = x.item != null ? x.item.Date : x.request.Date,
  Price = x.item ? x.item.Price : 0m,
  Name = x.item ? x.item.Name : "",
  PayedAmount x.request ? x.request.PayedAmount : 0m
});

class Item
{
    public DateTime Date {get; set;}
    public decimal Price {get; set;}
    public string Name {get; set;}
}

class Request
{
    public DateTime Date {get; set;}
    public decimal PayedAmount {get; set;}
}

class MergedItem
{ 
    public DateTime Date {get; set;}
    public decimal Price {get; set;}
    public string Name {get; set;}
    public decimal PayedAmount {get; set;}
}

List<Item> items;
List<Request> requests;
// How can I do something like 
var final = items.UnionOnKey(requests, "Date").Select(x => new MergedItem()
{
  Date = x.item != null ? x.item.Date : x.request.Date,
  Price = x.item ? x.item.Price : 0m,
  Name = x.item ? x.item.Name : "",
  PayedAmount x.request ? x.request.PayedAmount : 0m
});

I simply need to include both a and b if the other one is null as well as match the two together

1 Reply

cap5lut•12mo ago

u would do that with an left outer join, as far as i can see thats done with a group join combined with an select many https://dotnettutorials.net/lesson/left-outer-join-in-linq/

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LINQ Left Join in C#

In this article, I am going to discuss LINQ Left Outer Join in C# with Examples. The Left Join in C# is also called Left Outer Join in LINQ.

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Full outer join two different structures - LINQ