Indexers in List vs Array

Question

How are the Indexers are defined in List and Arrays.

List lists=new List(); where MyStruct is a Structure.

Answer 1

I ran into this as well, when I was inspecting lambda expression types. When the lambda is compiled into an expression tree you can inspect the expression type for each node. It turns out that there is a special node type ArrayIndex for the Array indexer:

Expression> expression = () => new string[] { "Test" }[0];
Assert.Equal(ExpressionType.ArrayIndex, expression.Body.NodeType);

Whereas the List indexer is of type Call:

Expression> expression = () => new List() { "Test" }[0];
Assert.Equal(ExpressionType.Call, expression.Body.NodeType);

This just to illustrate that we can reason about the underlying architecture with lambda expressions.