Linq - retrieving data dependent on the object type?

The example you give could be solved using OfType : IEnumerable items = ... var results = items.OfType() . OrderBy(x => x. Created).ToList() If you have to support combinations of properties that cross classes i.

E all items that have the IsDeadly property, you could use a combination of reflection to check the properties you want to use and dynamic to enable the duck typing you need, since technically these are different IsDeadly properties, you just know they should be treated the same in your scenario Doing that you can then assign the properties in your anonymous type dynamically. I.e. The following example returns results for all of your types that have the IsDeadly property: var results = items.

OrderBy(x => x. Created) . Where(x => x.GetType().

GetProperty("IsDeadly")! =null) . Select( x => { dynamic o = x; return new { IsDeadly = o.

IsDeadly, Created = o. Created }; }) .ToList() Also as @Henk Holterman pointed out, it only makes sense to return an enumeration of anonymous types where each property of the returned type makes sense / is defined for all the items in the enumeration.

The example you give could be solved using OfType: IEnumerable items = ... var results = items.OfType() . OrderBy(x => x. Created).ToList(); If you have to support combinations of properties that cross classes i.

E all items that have the IsDeadly property, you could use a combination of reflection to check the properties you want to use and dynamic to enable the duck typing you need, since technically these are different IsDeadly properties, you just know they should be treated the same in your scenario. Doing that you can then assign the properties in your anonymous type dynamically. I.e.

The following example returns results for all of your types that have the IsDeadly property: var results = items. OrderBy(x => x. Created) .

Where(x => x.GetType(). GetProperty("IsDeadly")! =null) .

Select( x => { dynamic o = x; return new { IsDeadly = o. IsDeadly, Created = o. Created }; }) .ToList(); Also as @Henk Holterman pointed out, it only makes sense to return an enumeration of anonymous types where each property of the returned type makes sense / is defined for all the items in the enumeration.

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