performance - What is the most efficient way to do look-up table in C# -

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What is the most effective way to table lookup in C #

Up tables such as < / P> 

  0 "thing 1" 1 "thing 2" 2 "reserved" 3 "reserved" 4 "reserved" 5 "no problem"

Someone wants "thing 1" or "thing 2" to pass through 0 or 1. But they can pass some more, I have 256 such types of things and maybe 200 of them are reserved.

Want to set it so what's most efficient?

  • A string array or dictionary variable that receives all values ​​and then rounds up and returns values ​​to that location.

I have a problem with this problem "safe" value I do not want to make those unnecessary "reserved" values ​​or else I can have an I statement against "reserved" all different locations , But now they can only be 2-3, can be 2-3, 40-55 and byte in all the different places. This statement, if uncontrolled is accelerated then

  • My second option which I was thinking was a switch statement. And I will have all 50ish known values ​​and they will fall through reserve values ​​and through default.

I am thinking that there is too much processing by making this string array or making a dictionary and returning the proper value.

  • Something else? 

  The way? Var things = new dictionary & lt; Int, string & gt; (); Things [0] = "Cheese 1"; Things [1] = "thing 2"; Things [4711] = "Carmen Sandigo";

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