Convert C# to VB (LINQ - RemoveAll)

Question

User-2089506584 posted

Hi,

I have this book from sanders (Pro MVC 1) and the code below is what I'm trying to convert from C# to VB.

public void RemoveLine(Product product)
{
lines.RemoveAll(l => l.Product.ProductID == product.ProductID);
}

However, I don't have the intellisense for the RemoveAll method. [:(]

        Public Sub RemoveLine(ByVal product As ProductModel)
            Lines.RemoveAll(Function(c) c.Product.ProductID = product.ProductId)

        End Sub

Answer 1

User681036950 posted

What type of object is Lines?

Answer 2

User-2089506584 posted

Hi hoopslife,

It's type of IList

Private _Lines As New List(Of CartLine)
        Public ReadOnly Property Lines() As IList(Of CartLine)
            Get
                Return _Lines.AsReadOnly
            End Get
        End Property

Public Class CartLine

        Private _Product As Product
        Public Property Product() As Product
            Get
                Return _Product
            End Get
            Set(ByVal value As Product)
                _Product = value
            End Set
        End Property

    End Class

Answer 3

User681036950 posted

I believe it's because you made the Lines variable readonly.  Try to remove that and see if intellisense works.

Answer 4

User-2089506584 posted

Try to remove that and see if intellisense works.

Unfortunately, it did not. [:(]

Maybe the VB version is indeed the Remove method. Is it?

Answer 5

User681036950 posted

I just tried this in VB.NET and C# and RemoveAll() is not available for the IList.  You have to use a System.Collections.Generic.List object to use RemoveAll().

This will work - 

        Dim Lines As System.Collections.Generic.List(Of String)

        Lines.RemoveAll()

Private _Lines As New List(Of CartLine)    

Public Property Lines() As List(Of CartLine)

        Get

            Return _Lines

        End Get

        Set(ByVal value As List(Of CartLine))

            _Lines = value

        End Set

    End Property

        Public Sub RemoveLine(ByVal product As ProductModel)
            Lines.RemoveAll(Function(c) c.Product.ProductID = product.ProductId)

        End Sub

Answer 6

User-1542018982 posted

Hi,

If the type is IList, I think RemoveAll method not exists.
Refer link: http://msdn.microsoft.com/en-us/library/system.collections.ilist_members.aspx

I think there is line class that Implements IList with RemoveAll method.

Maybe links below can give you some ideas:
http://www.eggheadcafe.com/software/aspnet/32543773/use-linq-to-remove-object.aspx
http://www.aspfree.com/c/a/.NET/Generics-and-Interface-Based-Programming/

I'm new to System.Collections namespace. Hope the info can help.

Answer 7

User-2089506584 posted

Thank you so much, just like what I need! [:)]