switch/case with string
Thank you for the replies. It's good to know that switch on string can be used and it will be optimized! Discoveries like this can also give people confidence in the performance of C# and .NET in general.
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So it will optimize to do either a regular string comparison or a hashtable. The take-way being, prefer switch over if because it will optimize as your code evolves.
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For me it appears to use a hashtable if there are 10 or more cases. This is with .NET 1.1. Code Snippetswitch (s){ case"str1": Console.WriteLine("1"); break; case"str2":...
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The post about hashes says that the hash isn't used until more than a few cases are used. This would make sense.
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switch/case with string
Peter Ritchie wrote:I see nothing to do with hash tables when reflecting a switch statement. It performs the same instructions as if would (ldloc, ldstr, call System.String_Equality), the only...
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I see nothing to do with hash tables when reflecting a switch statement. It performs the same instructions as if would (ldloc, ldstr, call System.String : : op_Equality), the only difference is with a...
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switch/case with string
The two previous posts contradict. One has a link that says hash tables are used and the other says that it is simple ifs. Please let's "hash" this out.
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Yes the C# compiler converts switches into a series of if statements. With strings, it simply does a byte-wise comparison; it will not do a localized comparison.
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Check out this link for more info: http://benjaminm.net/PermaLink.aspx?guid=10071512-7fa5-43eb-9bbc-5c345d0e13f5. It seems that it does use some sort of hash table for the comparisons, although I seem...
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switch/case is using jump tables, but I do not exactly know on what it's based on the case of strings but I think it's using the direct representation of the strings. Maybe someone else knows some more...
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Thank you. What is the actual optimization mechanism (e.g. jump table based on hash of each string etc.)?
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If you step through your code you will see it is more efficient. instead of forcing the compiler and your run time to compare your string values, the switch case jumps to the correct case... I think...
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Does C# optimize switch/case for strings in any way such that it is more efficient than a series of if-else(s) ? For example, the C++ compiler can use jump tables for switch/case with integers. (Note:...
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