DateTime problem

[JFieseler]

Hi all,

in a huge project i have the following problem.
I create an object which contains many private members (i know that this is
not correct, but it is a single use migration program). The members will be
filled from database tables. In the fill method i see in debug mode the
correct values. At the source where i create the object the DateTime members
of the object are not present (error: cannot obtain value). An statement like
this
DateTime dat = object.startDat e delivers 01/01/01.
If the object reference will be pass to a other method, inthis method is the
correct value present.
This all happens only for the DateTime members. Int32, Strinng are not
affected.

Who can help?

Josef Fieseler

[JFieseler]

RE: DateTime problem

Correction: I mind certainly "public members"

"JFieseler" wrote:

Hi all,
>
in a huge project i have the following problem.
I create an object which contains many private members (i know that this is
not correct, but it is a single use migration program). The members will be
filled from database tables. In the fill method i see in debug mode the
correct values. At the source where i create the object the DateTime members
of the object are not present (error: cannot obtain value). An statement like
this
DateTime dat = object.startDat e delivers 01/01/01.
If the object reference will be pass to a other method, inthis method is the
correct value present.
This all happens only for the DateTime members. Int32, Strinng are not
affected.
>
Who can help?
>
Josef Fieseler

[Morten Wennevik]

Re: DateTime problem

Hi Josef,

I'm not sure I follow you

I assume you have a startDate member in your object, but I'm not sure what
happens to this member. Is it set to null, DateTime.Minimu m or some other
value to begin with?

When does object.startDat e return 01/01/01?

I suspect you are trying to use an uninitizalied DateTime object, although
I may have misunderstood your letter.
Remember also that the debugger may not always show the correct
information.



On Fri, 11 Aug 2006 11:48:01 +0200, JFieseler
<JFieseler@disc ussions.microso ft.comwrote:

Correction: I mind certainly "public members"
>
"JFieseler" wrote:
>

>Hi all,
>>
>in a huge project i have the following problem.
>I create an object which contains many private members (i know that
>this is
>not correct, but it is a single use migration program). The members
>will be
>filled from database tables. In the fill method i see in debug mode the
>correct values. At the source where i create the object the DateTime
>members
>of the object are not present (error: cannot obtain value). An
>statement like
>this
>DateTime dat = object.startDat e delivers 01/01/01.
>If the object reference will be pass to a other method, inthis method
>is the
>correct value present.
>This all happens only for the DateTime members. Int32, Strinng are not
>affected.
>>
>Who can help?
>>
>Josef Fieseler

--
Happy Coding!
Morten Wennevik [C# MVP]

[JFieseler]

Re: DateTime problem

Hi Morten,

i will try to clarify my problem:

class X {public DateTime dat; ... public void LoadFromDB() }

Main:
X x = new x();
x.LoadFromDB; // If i debug the LoadFromDB method i see the correct date
value.
DateTime myDat = x.dat // Result = 01/01/01
AnyMethod(x)


public void AnyMethod(X x)
{
x.dat has the correct value!!!!!!!
}


Best regards
Joe


"Morten Wennevik" wrote:

Hi Josef,
>
I'm not sure I follow you
>
I assume you have a startDate member in your object, but I'm not sure what
happens to this member. Is it set to null, DateTime.Minimu m or some other
value to begin with?
>
When does object.startDat e return 01/01/01?
>
I suspect you are trying to use an uninitizalied DateTime object, although
I may have misunderstood your letter.
Remember also that the debugger may not always show the correct
information.
>
>
>
On Fri, 11 Aug 2006 11:48:01 +0200, JFieseler
<JFieseler@disc ussions.microso ft.comwrote:
>

Correction: I mind certainly "public members"

"JFieseler" wrote:

Hi all,
>
in a huge project i have the following problem.
I create an object which contains many private members (i know that
this is
not correct, but it is a single use migration program). The members
will be
filled from database tables. In the fill method i see in debug mode the
correct values. At the source where i create the object the DateTime
members
of the object are not present (error: cannot obtain value). An
statement like
this
DateTime dat = object.startDat e delivers 01/01/01.
If the object reference will be pass to a other method, inthis method
is the
correct value present.
This all happens only for the DateTime members. Int32, Strinng are not
affected.
>
Who can help?
>
Josef Fieseler

>
>
>
--
Happy Coding!
Morten Wennevik [C# MVP]
>

[Morten Wennevik]

Re: DateTime problem

Hm are you saying that myDat ends up 01/01/01 even if x.dat is correct?
Or do you mean x.dat is wrong when you call x.dat the first time, but
correct when you call it from AnyMethod? I assume 01/01/01 is not the
correct value.

I can't tell from your pseudocode what is wrong. It would help if you
could show us some real code.

dat will be 01/01/01 since a class variable of type DateTime will be
initialized to DateTime.Minimu m.
It will remain DateTime.Minimu m until changed. If you read from the
database, but dat is unchanged I'd check how you store the database value
into dat.


On Fri, 11 Aug 2006 12:42:02 +0200, JFieseler
<JFieseler@disc ussions.microso ft.comwrote:

Hi Morten,
>
i will try to clarify my problem:
>
class X {public DateTime dat; ... public void LoadFromDB() }
>
Main:
X x = new x();
x.LoadFromDB; // If i debug the LoadFromDB method i see the correct date
value.
DateTime myDat = x.dat // Result = 01/01/01
AnyMethod(x)
>
>
public void AnyMethod(X x)
{
x.dat has the correct value!!!!!!!
}
>
>
Best regards
Joe
>
>
"Morten Wennevik" wrote:
>

>Hi Josef,
>>
>I'm not sure I follow you
>>
>I assume you have a startDate member in your object, but I'm not sure
>what
>happens to this member. Is it set to null, DateTime.Minimu m or some
>other
>value to begin with?
>>
>When does object.startDat e return 01/01/01?
>>
>I suspect you are trying to use an uninitizalied DateTime object,
>although
>I may have misunderstood your letter.
>Remember also that the debugger may not always show the correct
>information.
>>
>>
>>
>On Fri, 11 Aug 2006 11:48:01 +0200, JFieseler
><JFieseler@dis cussions.micros oft.comwrote:
>>

Correction: I mind certainly "public members"
>
"JFieseler" wrote:
>
>Hi all,
>>
>in a huge project i have the following problem.
>I create an object which contains many private members (i know that
>this is
>not correct, but it is a single use migration program). The members
>will be
>filled from database tables. In the fill method i see in debug mode

>the

>correct values. At the source where i create the object the DateTime
>members
>of the object are not present (error: cannot obtain value). An
>statement like
>this
>DateTime dat = object.startDat e delivers 01/01/01.
>If the object reference will be pass to a other method, inthis method
>is the
>correct value present.
>This all happens only for the DateTime members. Int32, Strinng are

>not

>affected.
>>
>Who can help?
>>
>Josef Fieseler

>>
>>
>>
>--
>Happy Coding!
>Morten Wennevik [C# MVP]
>>

--
Happy Coding!
Morten Wennevik [C# MVP]

[JFieseler]

RE: DateTime problem

Yes, x.dat is correct (debugging the Load-Method) and myDat not! If i debug
the
Statement "DateTime myDat = x.dat" the value of x.dat.Year is: "error:
cannot obtain value"

"JFieseler" wrote:

Correction: I mind certainly "public members"
>
"JFieseler" wrote:
>

Hi all,

in a huge project i have the following problem.
I create an object which contains many private members (i know that this is
not correct, but it is a single use migration program). The members will be
filled from database tables. In the fill method i see in debug mode the
correct values. At the source where i create the object the DateTime members
of the object are not present (error: cannot obtain value). An statement like
this
DateTime dat = object.startDat e delivers 01/01/01.
If the object reference will be pass to a other method, inthis method is the
correct value present.
This all happens only for the DateTime members. Int32, Strinng are not
affected.

Who can help?

Josef Fieseler

[JFieseler]

Re: DateTime problem

Hi Morton,

i have found the solution per luck:

After the statement
DateTime myDat = x.dat
follows many Method Calls with many params. Nearly all params are self
defined objects.
I have change all params from "by value" to "by reference" and behold it
works correctly!
Many thanks for this chat.
Joe

"Morten Wennevik" wrote:

Hm are you saying that myDat ends up 01/01/01 even if x.dat is correct?
Or do you mean x.dat is wrong when you call x.dat the first time, but
correct when you call it from AnyMethod? I assume 01/01/01 is not the
correct value.
>
I can't tell from your pseudocode what is wrong. It would help if you
could show us some real code.
>
dat will be 01/01/01 since a class variable of type DateTime will be
initialized to DateTime.Minimu m.
It will remain DateTime.Minimu m until changed. If you read from the
database, but dat is unchanged I'd check how you store the database value
into dat.
>
>
On Fri, 11 Aug 2006 12:42:02 +0200, JFieseler
<JFieseler@disc ussions.microso ft.comwrote:
>

Hi Morten,

i will try to clarify my problem:

class X {public DateTime dat; ... public void LoadFromDB() }

Main:
X x = new x();
x.LoadFromDB; // If i debug the LoadFromDB method i see the correct date
value.
DateTime myDat = x.dat // Result = 01/01/01
AnyMethod(x)


public void AnyMethod(X x)
{
x.dat has the correct value!!!!!!!
}


Best regards
Joe


"Morten Wennevik" wrote:

Hi Josef,
>
I'm not sure I follow you
>
I assume you have a startDate member in your object, but I'm not sure
what
happens to this member. Is it set to null, DateTime.Minimu m or some
other
value to begin with?
>
When does object.startDat e return 01/01/01?
>
I suspect you are trying to use an uninitizalied DateTime object,
although
I may have misunderstood your letter.
Remember also that the debugger may not always show the correct
information.
>
>
>
On Fri, 11 Aug 2006 11:48:01 +0200, JFieseler
<JFieseler@disc ussions.microso ft.comwrote:
>
Correction: I mind certainly "public members"

"JFieseler" wrote:

Hi all,
>
in a huge project i have the following problem.
I create an object which contains many private members (i know that
this is
not correct, but it is a single use migration program). The members
will be
filled from database tables. In the fill method i see in debug mode
the
correct values. At the source where i create the object the DateTime
members
of the object are not present (error: cannot obtain value). An
statement like
this
DateTime dat = object.startDat e delivers 01/01/01.
If the object reference will be pass to a other method, inthis method
is the
correct value present.
This all happens only for the DateTime members. Int32, Strinng are
not
affected.
>
Who can help?
>
Josef Fieseler
>
>
>
--
Happy Coding!
Morten Wennevik [C# MVP]
>

>
>
>
--
Happy Coding!
Morten Wennevik [C# MVP]
>