I have a routine that compares 2 intances of the same object to see if there are any changes. The problem is that even though there are no changes, it tells me there are. I have even tried running a new routine that shows a messagebox with both objects' property values. below is my code.
this is the actual comparison code:
Dim Properties() As PropertyInfo = pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance)
Dim PropertyItem As PropertyInfo
For Each PropertyItem In Properties
If ischanged = False Then
With PropertyItem
Dim o1 As New Object''These are just for testing and will be returned to refactored code
Dim o2 As New Object''These are just for testing and will be returned to refactored code
o1 = .GetValue(obj, Nothing)''These are just for testing and will be returned to refactored code
o2 = .GetValue(obj_original, Nothing)''These are just for testing and will be returned to refactored code
'TODO Comment These Out
Debug.WriteLine(String.Format("Property Name: {0} PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType))
Debug.WriteLine(String.Format(" Name {0}", .Name))
Debug.WriteLine(String.Format(" New Value {0}", o1))
Debug.WriteLine(String.Format("Original Value {0}", o2))
'Debug.WriteLine(String.Format(" isChanged {0}", ischanged.ToString))
Debug.WriteLine(Environment.NewLine)
If Not o1.Equals(o2) Then
ischanged = True
End If
End With
End If
Next
This is the code that I validate with first: it displays the information properly.
Private Shared Sub validateValues(ByVal obj As Object, ByVal obj_original As Object, ByVal ptype As Type)
Dim s As New StringBuilder
Dim Properties() As PropertyInfo = ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance)
Dim PropertyItem As PropertyInfo
For Each PropertyItem In Properties
With PropertyItem
s.AppendFormat("Property Name:{0} CurrentValue:{1} OriginalValue:{1}", .Name, .GetValue(obj, Nothing), ..GetValue(obj_original, Nothing))
s.Append(Environment.NewLine)
End With
Next
MessageBox.Show(s.ToString)
End Sub
--
--Eric Cathell, MCSA 6 1185
That's because the line:
If Not o1.Equals(o2) Then
ischanged = True
End If
is checking for reference equality, and not value equality. For example:
Dim myObj1 As Object = New Object()
Dim myObj2 As Object = New Object()
'Will return false because the references point to different object
MessageBox.Show(myObj1.Equals(myObj2))
myObj1 = myObj2
'Will return true because the references point to the same object
MessageBox.Show(myObj1.Equals(myObj2))
"ECathell" wrote: I have a routine that compares 2 intances of the same object to see if there are any changes. The problem is that even though there are no changes, it tells me there are. I have even tried running a new routine that shows a messagebox with both objects' property values. below is my code.
this is the actual comparison code: Dim Properties() As PropertyInfo = pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties If ischanged = False Then
With PropertyItem Dim o1 As New Object''These are just for testing and will be returned to refactored code Dim o2 As New Object''These are just for testing and will be returned to refactored code o1 = .GetValue(obj, Nothing)''These are just for testing and will be returned to refactored code o2 = .GetValue(obj_original, Nothing)''These are just for testing and will be returned to refactored code 'TODO Comment These Out Debug.WriteLine(String.Format("Property Name: {0} PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) Debug.WriteLine(String.Format(" Name {0}", .Name)) Debug.WriteLine(String.Format(" New Value {0}", o1)) Debug.WriteLine(String.Format("Original Value {0}", o2)) 'Debug.WriteLine(String.Format(" isChanged {0}", ischanged.ToString)) Debug.WriteLine(Environment.NewLine) If Not o1.Equals(o2) Then
ischanged = True End If
End With End If Next
This is the code that I validate with first: it displays the information properly.
Private Shared Sub validateValues(ByVal obj As Object, ByVal obj_original As Object, ByVal ptype As Type) Dim s As New StringBuilder
Dim Properties() As PropertyInfo = ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties With PropertyItem s.AppendFormat("Property Name:{0} CurrentValue:{1} OriginalValue:{1}", .Name, .GetValue(obj, Nothing), ..GetValue(obj_original, Nothing)) s.Append(Environment.NewLine)
End With Next MessageBox.Show(s.ToString)
End Sub -- --Eric Cathell, MCSA
That's because the line:
If Not o1.Equals(o2) Then
ischanged = True
End If
is checking for reference equality, and not value equality. For example:
Dim myObj1 As Object = New Object()
Dim myObj2 As Object = New Object()
'Will return false because the references point to different object
MessageBox.Show(myObj1.Equals(myObj2))
myObj1 = myObj2
'Will return true because the references point to the same object
MessageBox.Show(myObj1.Equals(myObj2))
"ECathell" wrote: I have a routine that compares 2 intances of the same object to see if there are any changes. The problem is that even though there are no changes, it tells me there are. I have even tried running a new routine that shows a messagebox with both objects' property values. below is my code.
this is the actual comparison code: Dim Properties() As PropertyInfo = pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties If ischanged = False Then
With PropertyItem Dim o1 As New Object''These are just for testing and will be returned to refactored code Dim o2 As New Object''These are just for testing and will be returned to refactored code o1 = .GetValue(obj, Nothing)''These are just for testing and will be returned to refactored code o2 = .GetValue(obj_original, Nothing)''These are just for testing and will be returned to refactored code 'TODO Comment These Out Debug.WriteLine(String.Format("Property Name: {0} PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) Debug.WriteLine(String.Format(" Name {0}", .Name)) Debug.WriteLine(String.Format(" New Value {0}", o1)) Debug.WriteLine(String.Format("Original Value {0}", o2)) 'Debug.WriteLine(String.Format(" isChanged {0}", ischanged.ToString)) Debug.WriteLine(Environment.NewLine) If Not o1.Equals(o2) Then
ischanged = True End If
End With End If Next
This is the code that I validate with first: it displays the information properly.
Private Shared Sub validateValues(ByVal obj As Object, ByVal obj_original As Object, ByVal ptype As Type) Dim s As New StringBuilder
Dim Properties() As PropertyInfo = ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties With PropertyItem s.AppendFormat("Property Name:{0} CurrentValue:{1} OriginalValue:{1}", .Name, .GetValue(obj, Nothing), ..GetValue(obj_original, Nothing)) s.Append(Environment.NewLine)
End With Next MessageBox.Show(s.ToString)
End Sub -- --Eric Cathell, MCSA
So then how do i check for value equality?
--
--Eric Cathell, MCSA
"rmacias" <rm*****@newsgroup.nospam> wrote in message
news:D1**********************************@microsof t.com... That's because the line:
If Not o1.Equals(o2) Then ischanged = True End If
is checking for reference equality, and not value equality. For example:
Dim myObj1 As Object = New Object() Dim myObj2 As Object = New Object()
'Will return false because the references point to different object MessageBox.Show(myObj1.Equals(myObj2))
myObj1 = myObj2
'Will return true because the references point to the same object MessageBox.Show(myObj1.Equals(myObj2))
"ECathell" wrote:
I have a routine that compares 2 intances of the same object to see if there are any changes. The problem is that even though there are no changes, it tells me there are. I have even tried running a new routine that shows a messagebox with both objects' property values. below is my code.
this is the actual comparison code: Dim Properties() As PropertyInfo = pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties If ischanged = False Then
With PropertyItem Dim o1 As New Object''These are just for testing and will be returned to refactored code Dim o2 As New Object''These are just for testing and will be returned to refactored code o1 = .GetValue(obj, Nothing)''These are just for testing and will be returned to refactored code o2 = .GetValue(obj_original, Nothing)''These are just for testing and will be returned to refactored code 'TODO Comment These Out Debug.WriteLine(String.Format("Property Name: {0} PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) Debug.WriteLine(String.Format(" Name {0}", .Name)) Debug.WriteLine(String.Format(" New Value {0}", o1)) Debug.WriteLine(String.Format("Original Value {0}", o2)) 'Debug.WriteLine(String.Format(" isChanged {0}", ischanged.ToString)) Debug.WriteLine(Environment.NewLine) If Not o1.Equals(o2) Then
ischanged = True End If
End With End If Next
This is the code that I validate with first: it displays the information properly.
Private Shared Sub validateValues(ByVal obj As Object, ByVal obj_original As Object, ByVal ptype As Type) Dim s As New StringBuilder
Dim Properties() As PropertyInfo = ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties With PropertyItem s.AppendFormat("Property Name:{0} CurrentValue:{1} OriginalValue:{1}", .Name, .GetValue(obj, Nothing), ..GetValue(obj_original, Nothing)) s.Append(Environment.NewLine)
End With Next MessageBox.Show(s.ToString)
End Sub -- --Eric Cathell, MCSA
Honestly, that depends on what the underlying type actually is. The Equals()
method in System.Object checks for reference equality. However, in a lot of
reference types derived from System.Object, the actual type overrides the
Equals() method to check for value equality (like System.String).
What are the System.Type values are you expecting on these properties? You
can try casting them to those specified types and then checking the values
using that types Equals() method (assuming it checks for value equality).
"ECathell" wrote: So then how do i check for value equality?
-- --Eric Cathell, MCSA "rmacias" <rm*****@newsgroup.nospam> wrote in message news:D1**********************************@microsof t.com... That's because the line:
If Not o1.Equals(o2) Then ischanged = True End If
is checking for reference equality, and not value equality. For example:
Dim myObj1 As Object = New Object() Dim myObj2 As Object = New Object()
'Will return false because the references point to different object MessageBox.Show(myObj1.Equals(myObj2))
myObj1 = myObj2
'Will return true because the references point to the same object MessageBox.Show(myObj1.Equals(myObj2))
"ECathell" wrote:
I have a routine that compares 2 intances of the same object to see if there are any changes. The problem is that even though there are no changes, it tells me there are. I have even tried running a new routine that shows a messagebox with both objects' property values. below is my code.
this is the actual comparison code: Dim Properties() As PropertyInfo = pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties If ischanged = False Then
With PropertyItem Dim o1 As New Object''These are just for testing and will be returned to refactored code Dim o2 As New Object''These are just for testing and will be returned to refactored code o1 = .GetValue(obj, Nothing)''These are just for testing and will be returned to refactored code o2 = .GetValue(obj_original, Nothing)''These are just for testing and will be returned to refactored code 'TODO Comment These Out Debug.WriteLine(String.Format("Property Name: {0} PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) Debug.WriteLine(String.Format(" Name {0}", .Name)) Debug.WriteLine(String.Format(" New Value {0}", o1)) Debug.WriteLine(String.Format("Original Value {0}", o2)) 'Debug.WriteLine(String.Format(" isChanged {0}", ischanged.ToString)) Debug.WriteLine(Environment.NewLine) If Not o1.Equals(o2) Then
ischanged = True End If
End With End If Next
This is the code that I validate with first: it displays the information properly.
Private Shared Sub validateValues(ByVal obj As Object, ByVal obj_original As Object, ByVal ptype As Type) Dim s As New StringBuilder
Dim Properties() As PropertyInfo = ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) Dim PropertyItem As PropertyInfo For Each PropertyItem In Properties With PropertyItem s.AppendFormat("Property Name:{0} CurrentValue:{1} OriginalValue:{1}", .Name, .GetValue(obj, Nothing), ..GetValue(obj_original, Nothing)) s.Append(Environment.NewLine)
End With Next MessageBox.Show(s.ToString)
End Sub -- --Eric Cathell, MCSA
I am using reflection to view the property values of a custom class. The
strange thing is on my non-complex objects this already works fine. It is
just on this class for now.All my classes have an abstract base and a
concrete class. However, this class has enumerations attached. Maybe that is
where my error is because my other classes dont do this...
Region "PrePack Enumeration"
Public Enum PrePackTypes
ICEPACK
TRAYPACK
End Enum
' Private mPrepack As Boolean
Private xPrepack As PrePackTypes
Public Shadows Property Prepack() As PrePackTypes
Get
Select Case MyBase.PrePack
Case True
xPrepack = PrePackTypes.TRAYPACK
Case False
xPrepack = PrePackTypes.ICEPACK
End Select
Return xPrepack
End Get
Set(ByVal Value As PrePackTypes)
xPrepack = Value
Select Case xPrepack
Case PrePackTypes.ICEPACK
MyBase.PrePack = False
Case PrePackTypes.TRAYPACK
MyBase.PrePack = True
End Select
End Set
End Property
#End Region
#Region "TareType Enumeration"
Public Enum TareTypes
STANDARD
PERCENTAGE
End Enum
'Private mTareType As Boolean
Private xTaretype As TareTypes
Public Shadows Property TareType() As TareTypes
Get
Select Case MyBase.TareType
Case True
xTaretype = TareTypes.PERCENTAGE
Case False
xTaretype = TareTypes.STANDARD
End Select
Return xTaretype
End Get
Set(ByVal Value As TareTypes)
xTaretype = Value
Select Case xTaretype
Case TareTypes.PERCENTAGE
MyBase.TareType = True
Case TareTypes.STANDARD
MyBase.TareType = False
End Select
End Set
End Property
'
#End Region
#Region "StorageTypes Enumeration"
Public Enum StorageTypes
REFRIGERATED
FROZEN
End Enum
'Private mStorage As String
Private xStorage As StorageTypes
Public Shadows Property Storage() As StorageTypes
Get
Select Case mStorage
Case "REFRIGERATED"
xStorage = StorageTypes.REFRIGERATED
Case "FROZEN"
xStorage = StorageTypes.FROZEN
End Select
Return xStorage
End Get
Set(ByVal Value As StorageTypes)
xStorage = Value
Select Case xStorage
Case StorageTypes.FROZEN
mStorage = "FROZEN"
Case StorageTypes.REFRIGERATED
mStorage = "REFRIGERATED"
End Select
End Set
End Property
#End Region
#Region "DateTypes Enumeration"
Public Enum DateTypes
[code]
[PACKED]
[SELL_BY]
[JULIAN]
End Enum
'Private mDateType As String
Private xDateType As DateTypes
Public Shadows Property DateType() As DateTypes
Get
Select Case mDateType
Case "CODE"
xDateType = DateTypes.CODE
Case "SELL-BY"
xDateType = DateTypes.SELL_BY
Case "PACKED"
xDateType = DateTypes.PACKED
Case "JULIAN"
xDateType = DateTypes.JULIAN
End Select
Return xDateType
End Get
Set(ByVal Value As DateTypes)
xDateType = Value
Select Case xDateType
Case DateTypes.CODE
mDateType = "CODE"
Case DateTypes.PACKED
mDateType = "PACKED"
Case DateTypes.SELL_BY
mDateType = "SELL-BY"
Case DateTypes.JULIAN
mdatetype = "JULIAN"
End Select
End Set
End Property
#End Region
#Region "WeightTypes Enumeration"
Public Enum WeightTypes
[FIXED]
[CATCH]
[KEYED]
End Enum
'Private mWeightType As String
Private xWeightType As WeightTypes
Public Shadows Property WeightType() As WeightTypes
Get
Select Case mWeightType
Case "FIXED"
xWeightType = WeightTypes.FIXED
Case "CATCH"
xWeightType = WeightTypes.CATCH
Case "KEYED"
xWeightType = WeightTypes.KEYED
End Select
Return xWeightType
End Get
Set(ByVal Value As WeightTypes)
xWeightType = Value
Select Case xWeightType
Case WeightTypes.CATCH
mWeightType = "CATCH"
Case WeightTypes.FIXED
mWeightType = "FIXED"
Case WeightTypes.KEYED
mWeightType = "KEYED"
End Select
End Set
End Property
'
#End Region
--
--Eric Cathell, MCSA
"rmacias" <rm*****@newsgroup.nospam> wrote in message
news:BB**********************************@microsof t.com... Honestly, that depends on what the underlying type actually is. The Equals() method in System.Object checks for reference equality. However, in a lot of reference types derived from System.Object, the actual type overrides the Equals() method to check for value equality (like System.String).
What are the System.Type values are you expecting on these properties? You can try casting them to those specified types and then checking the values using that types Equals() method (assuming it checks for value equality).
"ECathell" wrote:
So then how do i check for value equality?
-- --Eric Cathell, MCSA "rmacias" <rm*****@newsgroup.nospam> wrote in message news:D1**********************************@microsof t.com... > That's because the line: > > If Not o1.Equals(o2) Then > ischanged = True > End If > > is checking for reference equality, and not value equality. For > example: > > Dim myObj1 As Object = New Object() > Dim myObj2 As Object = New Object() > > 'Will return false because the references point to different object > MessageBox.Show(myObj1.Equals(myObj2)) > > myObj1 = myObj2 > > 'Will return true because the references point to the same object > MessageBox.Show(myObj1.Equals(myObj2)) > > "ECathell" wrote: > >> I have a routine that compares 2 intances of the same object to see if >> there are any changes. The problem is that even though there are no >> changes, it tells me there are. I have even tried running a new >> routine >> that shows a messagebox with both objects' property values. below is >> my >> code. >> >> >> this is the actual comparison code: >> Dim Properties() As PropertyInfo = >> pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) >> Dim PropertyItem As PropertyInfo >> For Each PropertyItem In Properties >> If ischanged = False Then >> >> With PropertyItem >> Dim o1 As New Object''These are just for testing and will >> be >> returned to refactored code >> Dim o2 As New Object''These are just for testing and will >> be >> returned to refactored code >> o1 = .GetValue(obj, Nothing)''These are just for testing >> and >> will be returned to refactored code >> o2 = .GetValue(obj_original, Nothing)''These are just for >> testing and will be returned to refactored code >> 'TODO Comment These Out >> Debug.WriteLine(String.Format("Property Name: {0} >> PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) >> Debug.WriteLine(String.Format(" Name {0}", >> .Name)) >> Debug.WriteLine(String.Format(" New Value {0}", o1)) >> Debug.WriteLine(String.Format("Original Value {0}", o2)) >> 'Debug.WriteLine(String.Format(" isChanged {0}", >> ischanged.ToString)) >> Debug.WriteLine(Environment.NewLine) >> If Not o1.Equals(o2) Then >> >> ischanged = True >> End If >> >> >> End With >> End If >> Next >> >> This is the code that I validate with first: it displays the >> information >> properly. >> >> Private Shared Sub validateValues(ByVal obj As Object, ByVal >> obj_original >> As Object, ByVal ptype As Type) >> Dim s As New StringBuilder >> >> Dim Properties() As PropertyInfo = >> ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) >> Dim PropertyItem As PropertyInfo >> For Each PropertyItem In Properties >> With PropertyItem >> s.AppendFormat("Property Name:{0} CurrentValue:{1} >> OriginalValue:{1}", .Name, .GetValue(obj, Nothing), >> ..GetValue(obj_original, Nothing)) >> s.Append(Environment.NewLine) >> >> End With >> Next >> MessageBox.Show(s.ToString) >> >> End Sub >> -- >> --Eric Cathell, MCSA
I fixed it...I think it had an issue with my shadows properties...changed
their name and voila....
Thanks for the help....
--
--Eric Cathell, MCSA
"rmacias" <rm*****@newsgroup.nospam> wrote in message
news:BB**********************************@microsof t.com... Honestly, that depends on what the underlying type actually is. The Equals() method in System.Object checks for reference equality. However, in a lot of reference types derived from System.Object, the actual type overrides the Equals() method to check for value equality (like System.String).
What are the System.Type values are you expecting on these properties? You can try casting them to those specified types and then checking the values using that types Equals() method (assuming it checks for value equality).
"ECathell" wrote:
So then how do i check for value equality?
-- --Eric Cathell, MCSA "rmacias" <rm*****@newsgroup.nospam> wrote in message news:D1**********************************@microsof t.com... > That's because the line: > > If Not o1.Equals(o2) Then > ischanged = True > End If > > is checking for reference equality, and not value equality. For > example: > > Dim myObj1 As Object = New Object() > Dim myObj2 As Object = New Object() > > 'Will return false because the references point to different object > MessageBox.Show(myObj1.Equals(myObj2)) > > myObj1 = myObj2 > > 'Will return true because the references point to the same object > MessageBox.Show(myObj1.Equals(myObj2)) > > "ECathell" wrote: > >> I have a routine that compares 2 intances of the same object to see if >> there are any changes. The problem is that even though there are no >> changes, it tells me there are. I have even tried running a new >> routine >> that shows a messagebox with both objects' property values. below is >> my >> code. >> >> >> this is the actual comparison code: >> Dim Properties() As PropertyInfo = >> pType.GetProperties(BindingFlags.Public Or BindingFlags.Instance) >> Dim PropertyItem As PropertyInfo >> For Each PropertyItem In Properties >> If ischanged = False Then >> >> With PropertyItem >> Dim o1 As New Object''These are just for testing and will >> be >> returned to refactored code >> Dim o2 As New Object''These are just for testing and will >> be >> returned to refactored code >> o1 = .GetValue(obj, Nothing)''These are just for testing >> and >> will be returned to refactored code >> o2 = .GetValue(obj_original, Nothing)''These are just for >> testing and will be returned to refactored code >> 'TODO Comment These Out >> Debug.WriteLine(String.Format("Property Name: {0} >> PropertyType:{1}", PropertyItem.Name, PropertyItem.PropertyType)) >> Debug.WriteLine(String.Format(" Name {0}", >> .Name)) >> Debug.WriteLine(String.Format(" New Value {0}", o1)) >> Debug.WriteLine(String.Format("Original Value {0}", o2)) >> 'Debug.WriteLine(String.Format(" isChanged {0}", >> ischanged.ToString)) >> Debug.WriteLine(Environment.NewLine) >> If Not o1.Equals(o2) Then >> >> ischanged = True >> End If >> >> >> End With >> End If >> Next >> >> This is the code that I validate with first: it displays the >> information >> properly. >> >> Private Shared Sub validateValues(ByVal obj As Object, ByVal >> obj_original >> As Object, ByVal ptype As Type) >> Dim s As New StringBuilder >> >> Dim Properties() As PropertyInfo = >> ptype.GetProperties(BindingFlags.Public Or BindingFlags.Instance) >> Dim PropertyItem As PropertyInfo >> For Each PropertyItem In Properties >> With PropertyItem >> s.AppendFormat("Property Name:{0} CurrentValue:{1} >> OriginalValue:{1}", .Name, .GetValue(obj, Nothing), >> ..GetValue(obj_original, Nothing)) >> s.Append(Environment.NewLine) >> >> End With >> Next >> MessageBox.Show(s.ToString) >> >> End Sub >> -- >> --Eric Cathell, MCSA This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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