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

[Andreas Klemt]

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

a) If myDate.Equals(D ate.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" <ak******@hotma il.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

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

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

Thanks,
Andreas

[Andreas Klemt]

Hello,

results are:

a) If myDate.Equals(D ate.MinValue)
0,007439

b) If myDate = Date.MinValue
0,002253

Regards,
Andreas
"MS News (MS ILM)" <sq**********@h otmail.com> schrieb im Newsbeitrag
news:eD******** ******@tk2msftn gp13.phx.gbl...

Time stamp it
Run a loop 1000000000 times and see which one is better
Please let us know
"Andreas Klemt" <ak******@hotma il.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

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

a) If myDate.Equals(D ate.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(D ate.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(value type [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: [phone]
Fax: [phone]
Mobile: [phone]
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