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From: Lucio Menci on 29 Jun 2010 05:37
Hi,

1.

In VB2010 the type (T) of the control variable of a For...Next cycle must
have the following operators:
Public Shared Operator >= (op1 As T, op2 As T) As B
Public Shared Operator <= (op1 As T, op2 As T) As B
Public Shared Operator - (op1 As T, op2 As T) As T
Public Shared Operator + (op1 As T, op2 As T) As T

I suggest to agree the use of For...Next cycle in that way:
Dim X1 As T
Dim X2 As T
Dim X3 As U
For X As T = X1 To X2 Step X3
....
Next X
Where is defined:
Public Shared Operator - (op1 As T, op2 As U) As T
Public Shared Operator + (op1 As T, op2 As U) As T

2.

The Extension attribute must be specified in a Module. I cannot use Shared
modifier in a Module. Then I cannot extend shared methods and properties. I
cannot also extend operators (that must be declared shared). The lexer should
ignore warnings for shared and operators routines in modules if they have
Extend attribute.

1+2.

I shuld define:
Public Module Pippo
<Extend> Public Shared Operator +(X As DateTime, Y As TimeSpan) As DateTime
Return X.Add(Y)
End Operator
<Extend> Public Shared Operator -(X As DateTime, Y As TimeSpan) As DateTime
Return X.Subtract(Y)
End Operator
End Module

to use a For...Next cycle like this:
For AvailableDays As Date = FirstDay To LastDay Step New TimeSpan(1, 0, 0, 0)
...
Next AvailableDays

Do you like this?

Thank you

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