Using lambda expressions for event handlers

Question

I currently have a page which is declared as follows   public partial class MyPage   System Web UI Page       protected void Page Load object sender  EventArgs e                  snip         MyButton Click     o  i    gt                          snip                     I ve only recently moved to  NET 3 5 from 1 1  so I m used to writing event handlers outside of the Page Load  My question is  are there any performance drawbacks or pitfalls I should watch out for when using the lambda method for this  I prefer it  as it s certainly more concise  but I do not want to sacrifice performance to use it  Thanks

User · Answer

No performance implications that I m aware of or have ever run into  as far as I know its just  syntactic sugar  and compiles down to the same thing as using delegate syntax  etc

User · Answer

EventHandler handler    s  e    gt  MessageBox Show  Woho     button Click    handler  button Click -  handler

User · Answer

There are no performance implications since the compiler will translate your lambda expression into an equivalent delegate   Lambda expressions are nothing more than a language feature that the compiler translates into the exact same code that you are used to working with   The compiler will convert the code you have to something like this   public partial class MyPage   System Web UI Page       protected void Page Load object sender  EventArgs e                  snip         MyButton Click    new EventHandler delegate  Object o  EventArgs a                           snip

User · Answer

Performance-wise it s the same as a named method  The big problem is when you do the following   MyButton Click -   o  i    gt            snip       It will probably try to remove a different lambda  leaving the original one there  So the lesson is that it s fine unless you also want to be able to remove the handler

[c#] Using lambda expressions for event handlers

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