VB.Net Exclamation Point (!)

Question

The following code is designer generated:

Me.lblXRay.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))

What's the 8.0! mean?

Answer 1

it mean type single

Answer 2

From the msdn library

Type Characters. Appending the literal type character F to a literal forces it to the Single data type. Appending the identifier type character ! to any identifier forces it to Single.

Answer 3

This dates back to very early versions of Microsoft Basic. These type characters let you both set the type of an identifier and a literal:

    Dim singleVar! = 1.2!
    Dim doubleVar# = 1.2#
    Dim decimalVar@ = 1.2@
    Dim integerVar% = 12%
    Dim longVar& = 12&
    Dim stringVar$ = "12"

    Function ReturnsString$(ByVal takesLong&)