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Linq selecting items that exist in both list

开发者 https://www.devze.com 2023-01-19 20:24 出处:网络
I have 2 list: myObject object1 = new myObject(id = 1, title = \"object1\"}; myObject objec开发者_Go百科t2 = new myObject(id = 2, title = \"object2\"};

I have 2 list:

myObject object1 = new myObject(id = 1, title = "object1"};
myObject objec开发者_Go百科t2 = new myObject(id = 2, title = "object2"};
myObject object3 = new myObject(id = 3, title = "object3"};

//List 1
List<myObject> myObjectList = new List<myObject>{object1, object2, object3};

//List 2
List<int> idList = new List<int>{2, 3};

Is there a way using Linq to pull only the objects in the first list that exist in the second list so that I am left with:

{object2, object3}

I looked at intersect but it seems that this will only work if both list are of the same type.

Any help would be greatly appreciated.

Thanks.


LINQ Solution:

myObjectList = myObjectList.Where(X => idList.Contains(X.id)).ToList();


IEnumerable<myObject> matches = myObjectList.Join(
    idList,
    o => o.Id,
    id => id,
    (o, id) => o);


The official LINQ solution as of .Net 6 is IntersectBy:

var matches = myObjectList.IntersectBy(idList, o => o.Id);
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