nullable properties?

[mtsu_bravo]

I think I found a bug, below is a test case.

Public Class test

  Private _age As Nullable(Of Integer)

  Private _date As DateTime = Date.Now

  Public Property age() As Nullable(Of Integer)

  Get

  age = _age

  End Get

  Set(ByVal Value As Nullable(Of Integer))

  _age = Value

  End Set

  End Property

  Public Property dateNow() As DateTime

  Get

  dateNow = _date

  End Get

  Set(ByVal Value As DateTime)

  _date = Value

  End Set

  End Property

End Class

 

Dim testList As IList(Of test) = New List(Of test)

  Dim test1 As test = New test

  Dim test2 As test = New test

  Dim test3 As test = New test

  test1.age = 14

  testList.Add(test1)

  test2.age = 15

  testList.Add(test2)

  test3.age = 34

  testList.Add(test3)

  Chart1.DataSource = testList

  Chart1.DataBind()

 

any time I have a property with a type of nullable it just puts in zeros for the values. I saw some other posts were they had similar problems but were not using list objects.

[Frank]

Nullable objects are currently not supported when binding to CLR objects.

You need to use the Data API to pass these values as Chart.Hidden.

[mtsu_bravo]

Can you point me to the "Data API" documentation or provide me with an example of changing the example above to what you are refering to?

[Frank]

The documentation is part of the API documentatation. Inside the Chart Object, go to the Data property:

http://support.softwarefx.com/OnlineDoc/CfxNet70//WinAPI/Chart_Data.htm 

A sample app can be found at:

http://support.softwarefx.com/Samples/CfxNet70//Samples/PassingData/Default.aspx

The option you are interested in is API.

[zac morris]

 

Will this behavior be fixed in v8?  The increasing prevalence of nullable types in newer data access APIs (LINQ to SQL, Entity Framework) makes this shortcoming a pain.

Thanks,

Zac 

[Frank]

Integration with these new technologies is in the works.

[cbg3]

 +1 for nullable type support.

--Ben