I am trying to compare two list of same type using multiple properties of that type.
For example,
I have a class named Details
public class Details
{
public int id;
public string symbol;
public string code;
}
I have below two lists:
List<Details> list1 = new List<Details>();
List<Details> list2 = new List<Details>();
list1.Add(new Details() { id=1,symbol="ANSI",code="NITE"});
list1.Add(new Details() { id = 1, symbol = "ANSI", code = "CALGO" });
list1.Add(new Details() { id = 1, symbol = "ANSI", code = "CANT" });
list1.Add(new Details() { id=2,symbol="ANSI",code="NITE"});
list1.Add(new Details() { id = 2, symbol = "ANSI", code = "CALGO" });
list1.Add(new Details() { id = 2, symbol = "ANSI", code = "CANT" });
list2.Add(new Details() { id = 1, symbol = "ANSI", code = "NITE" });
list2.Add(new Details() { id = 1, symbol = "ANSI", code = "CALGO" });
list2.Add(new Details() { id = 2, symbol = "ANSI", code = "NITE" });
I want only that data from List1 which has same id, symbol but different code.
So, in above scenario result will be as below.
list1.Add(new Details() { id = 1, symbol = "ANSI", code = "CANT" });
list1.Add(new Details() { id = 2, symbol = "ANSI", code = "CALGO" });
list1.Add(new Details() { id = 2, symbol = "ANSI", code = "CANT" });
It would be great if this can be achieved through Linq instead of using foreach.
I tried below but that's not correct.
var temp =list1.Where(x=>list2.Any(z=>x.id==z.id && string.Equals(x.symbol,z.symbol) && !string.Equals(x.code,z.code)));
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It looks like you need rows to satisfy two conditions, not one, in order to make the output:
id
and symbol
, andid
, symbol
, and code
.Here is how to do that with LINQ directly:
var tmp = list1.Where(x=>
list2.Any(z=>x.id==z.id && x.symbol==z.symbol)
&& !list2.Any(z => x.id==z.id && x.symbol==z.symbol && x.code==z.code));
Demo.
An alternative based on applying De Morgan's laws:
var tmp = list1.Where(x=>
list2.Any(z=>x.id==z.id && x.symbol==z.symbol)
&& list2.All(z => x.id!=z.id || x.symbol!=z.symbol || x.code!=z.code));
Demo.
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