To be sure that I understand could someone confirm that lambda expressions use reflection?
To be sure that I understand could someone confirm that lambda expressions use reflection?
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To be sure that I understand could someone confirm that lambda expressions use reflection?
They can, but they are not required to. If they are compiled to a delegate, then no reflection is necessary: however, if they are compiled to ab expression tree, then an expression tree is absolutely reflection-based. Some parts of expression trees can be assembled directly from metadata tokens (ldtoken) – in particular methods (including operators and getters/setters, and types) – but some other parts cannot . This includes properties (
PropertyInfocannot be loaded by token) – so the IL for a compiled lambda can explicitly includeGetPropertyetc.But however it is loaded (token or reflection), an expression tree is expressed in terms of reflection (
MemberInfo, etc). This might later be compiled, or might be analysed by a provider.To help performance, the expression compiler may cache some or all of the expression tree, and re-use it.