Difference? myDate.Equals(Date.MinValue) -or- myDate = Date.MinValue

[Andreas Klemt]

Hello,
what is the difference and what is better (performance etc) ?

a) If myDate.Equals(Date.MinValue)
b) If myDate = Date.MinValue

Thanks,
Andreas

[Jerry III]

Don't know about VB but in C# the operator calls the function. Depending on
the compiler the function might be faster (but most likely it will be the
same as the compiler will do the substitution, much like inline functions in
C++).

Jerry

"Andreas Klemt" <[email protected]> wrote in message
news:%[email protected]..

> Hello,
> what is the difference and what is better (performance etc) ?
>
> a) If myDate.Equals(Date.MinValue)
> b) If myDate = Date.MinValue
>
> Thanks,
> Andreas
>
>

[Andreas Klemt]

Hello,

results are:

a) If myDate.Equals(Date.MinValue)
0,007439

b) If myDate = Date.MinValue
0,002253

Regards,
Andreas


"MS News (MS ILM)" <[email protected]> schrieb im Newsbeitrag
news:[email protected]..

> Time stamp it
> Run a loop 1000000000 times and see which one is better
> Please let us know
>
>
> "Andreas Klemt" <[email protected]> wrote in message
> news:%[email protected]..

> > Hello,
> > what is the difference and what is better (performance etc) ?
> >
> > a) If myDate.Equals(Date.MinValue)
> > b) If myDate = Date.MinValue
> >
> > Thanks,
> > Andreas
> >
> >

>
>

[Natty Gur]

Take a look in IL and you will see that CLR use Boxing just for Equals.
Equals should be slower.

//000004: Dim myDate As Date
//000005: If myDate.Equals(Date.MinValue) Then
IL_0001: ldloca.s myDate
IL_0003: ldsfld valuetype [mscorlib]System.DateTime
[mscorlib]System.DateTime::MinValue
IL_0008: box [mscorlib]System.DateTime
IL_000d: call instance bool
[mscorlib]System.DateTime::Equals(object)
IL_0012: brfalse.s IL_0014
//000006:
//000007: End If
IL_0014: nop
//000008: If myDate = Date.MinValue Then
IL_0015: ldloc.0
IL_0016: ldsfld valuetype [mscorlib]System.DateTime
[mscorlib]System.DateTime::MinValue
IL_001b: call int32
[mscorlib]System.DateTime::Compare(valuetype [mscorlib]System.DateTime,

valuetype [mscorlib]System.DateTime)
IL_0020: ldc.i4.0
IL_0021: bne.un.s IL_0023
//000009:
//000010: End If

Natty Gur, CTO
Dao2Com Ltd.
34th Elkalay st. Raanana
Israel , 43000
Phone Numbers:
Office: +972-(0)9-7740261
Fax: +972-(0)9-7740261
Mobile: +972-(0)58-888377


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[Natty Gur]

Hi,

run ILdasm.exe, open your assembly and look for your method. befor open
it enable show source lines from view menu.


Natty Gur, CTO
Dao2Com Ltd.
34th Elkalay st. Raanana
Israel , 43000
Phone Numbers:
Office: +972-(0)9-7740261
Fax: +972-(0)9-7740261
Mobile: +972-(0)58-888377


*** Sent via Developersdex [url]http://www.developersdex.com[/url] ***
Don't just participate in USENET...get rewarded for it!