Question

Similar to this question, but for VB.NET since I learned this is a language thing.

For instance, would the compiler know to translate

Dim s As String = ‘test ‘ + ‘this ‘ + ‘function’

to

Dim s As String = 'test this function' 

and thus avoid the performance hit with the string concatenation?

Answer 1

Yes. It Does. I only tested VS 2008 but I strongly suspect previous versions did as well.

VB.NET

Public Class Class1       Dim s As String = 'test ' + 'this ' + 'function'      Public Function test() As String         Return s     End Function  End Class 

I.L. – Notice the string ‘test this function’

{     .maxstack 8     L_0000: ldarg.0      L_0001: call instance void [mscorlib]System.Object::.ctor()     L_0006: nop      L_0007: ldarg.0      L_0008: ldstr 'test this function'     L_000d: stfld string ClassLibrary1.Class1::s     L_0012: nop      L_0013: ret  }