I have a class called products. In my maintenance application I am instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_origin al is loaded at the same time as the original mProduct is instantiated.
I would like to know if there is a simple way to iterate through the properties of each and compare them for changes?
--
--Eric Cathell, MCSA
8  1520 
ok I have figured out so far I can do this with reflection. here is what I have so far.
Private Sub checkForChanges (ByVal pType As Type) ', ByVal poType As Type)
Dim productProperti es() As PropertyInfo = pType.GetProper ties(BindingFla gs.Public Or BindingFlags.In stance)
Dim PropertyItem As PropertyInfo
For Each PropertyItem In productProperti es
With PropertyItem
Debug.WriteLine (PropertyItem.N ame)
debug.WriteLine (mproduct.prope rty
End With
Next
End Sub
I got this far with an article from O'reilly. Now how do I use the propertyitem.na me to tie in with the actual class property? In otherwords, If propertyname is Customername who do I use that to access product.custome rname's value so that I can compare it to product_origina l.customername?
--
--Eric Cathell, MCSA
"ECathell" <ec******@nospa m.mountaire.com > wrote in message news:uZ******** ********@tk2msf tngp13.phx.gbl. ..
I have a class called products. In my maintenance application I am instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_origin al is loaded at the same time as the original mProduct is instantiated.
I would like to know if there is a simple way to iterate through the properties of each and compare them for changes?
--
--Eric Cathell, MCSA
IMHO, the best thing to do would be to have you class implement the
IComparable interface and then write the code to compare the two objects
and return the results.
Hope this helps,
Brian Swanson
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com: I have a class called products. In my maintenance application I am
instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_origin al is loaded at the same time as the original mProduct is
instantiated.
I would like to know if there is a simple way to iterate through the
properties of each and compare them for changes?
--
--Eric Cathell, MCSA
everything I find on icomparable shows it only as a method for sorting data.
How would I use it to compare the differences in the properties of the
Product object?
--
--Eric Cathell, MCSA
"Brian Swanson" <pu*******@gREM OVETHISmail.com > wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. .. IMHO, the best thing to do would be to have you class implement the
IComparable interface and then write the code to compare the two objects
and return the results.
Hope this helps,
Brian Swanson
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com: I have a class called products. In my maintenance application I am
instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_origin al is loaded at the same time as the original mProduct is
instantiated.
I would like to know if there is a simple way to iterate through the
properties of each and compare them for changes?
--
--Eric Cathell, MCSA
Having a class implement IComparable gives it a "CompareTo" method which
can takes an object as a parameter, you then compare the current
instance of your class (that was used to run CompareTo) to the instance
that was passed as a parameter.
I'll post an example if you need it, just let me know...
Hope this helps,
Brian Swanson
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com: everything I find on icomparable shows it only as a method for sorting
data.
How would I use it to compare the differences in the properties of the
Product object?
--
--Eric Cathell, MCSA
"Brian Swanson" <pu*******@gREM OVETHISmail.com > wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. .. IMHO, the best thing to do would be to have you class implement the
IComparable interface and then write the code to compare the two objects
and return the results.
Hope this helps,
Brian Swanson
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com: I have a class called products. In my maintenance application I am
instantiating two versions of this class.
mProduct is used in all transactions and changes
mProduct_origin al is loaded at the same time as the original mProduct
is
instantiated.
I would like to know if there is a simple way to iterate through the
properties of each and compare them for changes?
--
--Eric Cathell, MCSA
hmmm, I dont think that will still work because I am trying to compare the Properties of the class to see if they have been changed... here is some more code hope it helps...
mProduct = New Mountaire.Datab ase.Product(txt PLUnumber.Text, mCurrentFacilit y.Location)
mProduct_Origin al = New Mountaire.Datab ase.Product(txt PLUnumber.Text, mCurrentFacilit y.Location)
populateProduct Fields(mProduct )
This first bit creates 2 new product objects. The populateproduct fields populates text fields and boxes with the information on that product.
When the user moves off this particular product I need to verify that no changes were made. The easiest way for me to do this is to compare the properties of both product objects to see if they are different.
there are 45 or so properties of the product class that need to be compared. If I understand you right if I compare the 2 alone it will still work?
ie
private function CompareTo(by val obj as object) as integer implements icomparable.com pareto
dim other as product=ctype(o bj,product)
if me=other then return 0 else return 1
end function
Is that what you mean?
Eric
Sorry if I wasn't clear on this...You'll still have to compare the
individual properties in your "CompareTo" code, I was just suggesting
that you use the IComparable interface as a place to implement that
code.
Sorry for the confusion..
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com: hmmm, I dont think that will still work because I am trying to compare the Properties of the class to see if they have been changed... here is some more code hope it helps...
mProduct = New Mountaire.Datab ase.Product(txt PLUnumber.Text, mCurrentFacilit y.Location)
mProduct_Origin al = New Mountaire.Datab ase.Product(txt PLUnumber.Text, mCurrentFacilit y.Location)
populateProduct Fields(mProduct )
This first bit creates 2 new product objects. The populateproduct fields populates text fields and boxes with the information on that product.
When the user moves off this particular product I need to verify that no changes were made. The easiest way for me to do this is to compare the properties of both product objects to see if they are different.
there are 45 or so properties of the product class that need to be compared. If I understand you right if I compare the 2 alone it will still work?
ie
private function CompareTo(by val obj as object) as integer implements icomparable.com pareto
dim other as product=ctype(o bj,product)
if me=other then return 0 else return 1
end function
Is that what you mean?
Eric
no worries. Then we are back to reflection. I can get all the property names
from reflection, In fact I already have that code done. Do you know how I
can use that information to test the properties of the specific instances?
Dim productProperti es() As PropertyInfo =
pType.GetProper ties(BindingFla gs.Public Or BindingFlags.In stance)
'Dim oProductPropert ies() As PropertyInfo =
poType.GetPrope rties(BindingFl ags.GetProperty )
Dim PropertyItem As PropertyInfo
For Each PropertyItem In productProperti es
With PropertyItem
Debug.WriteLine (PropertyItem.N ame)
if mproduct.proper tyitem=mOrigina lProduct.proper tyitem then
isDifferent=tru e
End With
Next
of course propertyitem doesnt work...do you know how I could use it to make
it work?
--
--Eric Cathell, MCSA
"Brian Swanson" <pu*******@gREM OVETHISmail.com > wrote in message
news:us******** ******@tk2msftn gp13.phx.gbl... Sorry if I wasn't clear on this...You'll still have to compare the
individual properties in your "CompareTo" code, I was just suggesting that
you use the IComparable interface as a place to implement that code.
Sorry for the confusion..
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com:
hmmm, I dont think that will still work because I am trying to compare
the Properties of the class to see if they have been changed... here is
some more code hope it helps...
mProduct = New Mountaire.Datab ase.Product(txt PLUnumber.Text,
mCurrentFacilit y.Location)
mProduct_Origin al = New Mountaire.Datab ase.Product(txt PLUnumber.Text,
mCurrentFacilit y.Location)
populateProduct Fields(mProduct )
This first bit creates 2 new product objects. The populateproduct fields
populates text fields and boxes with the information on that product.
When the user moves off this particular product I need to verify that no
changes were made. The easiest way for me to do this is to compare the
properties of both product objects to see if they are different.
there are 45 or so properties of the product class that need to be
compared. If I understand you right if I compare the 2 alone it will
still work?
ie
private function CompareTo(by val obj as object) as integer implements
icomparable.com pareto
dim other as product=ctype(o bj,product)
if me=other then return 0 else return 1
end function
Is that what you mean?
Eric
I found the information I was looking for..if you are interested here it
is...
myClass.GetType .GetProperty("P ropertyName").g etvalue(myclass ,nothing)
that will return the value of that property. You can then use the following
code to loop through the properties of your class...
For Each PropertyItem In productProperti es
With PropertyItem
end with
next
--
--Eric Cathell, MCSA
"Brian Swanson" <pu*******@gREM OVETHISmail.com > wrote in message
news:us******** ******@tk2msftn gp13.phx.gbl... Sorry if I wasn't clear on this...You'll still have to compare the
individual properties in your "CompareTo" code, I was just suggesting that
you use the IComparable interface as a place to implement that code.
Sorry for the confusion..
"ECathell" <ec******@nospa m.mountaire.com > wrote in message
news:ec******@n ospam.mountaire .com:
hmmm, I dont think that will still work because I am trying to compare
the Properties of the class to see if they have been changed... here is
some more code hope it helps...
mProduct = New Mountaire.Datab ase.Product(txt PLUnumber.Text,
mCurrentFacilit y.Location)
mProduct_Origin al = New Mountaire.Datab ase.Product(txt PLUnumber.Text,
mCurrentFacilit y.Location)
populateProduct Fields(mProduct )
This first bit creates 2 new product objects. The populateproduct fields
populates text fields and boxes with the information on that product.
When the user moves off this particular product I need to verify that no
changes were made. The easiest way for me to do this is to compare the
properties of both product objects to see if they are different.
there are 45 or so properties of the product class that need to be
compared. If I understand you right if I compare the 2 alone it will
still work?
ie
private function CompareTo(by val obj as object) as integer implements
icomparable.com pareto
dim other as product=ctype(o bj,product)
if me=other then return 0 else return 1
end function
Is that what you mean?
Eric This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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