Stephen Shakespeare

Lambda VB.Net Max

‘Lambda

Dim dList As IList(Of Decision) = CType(DecisionBindingSource.DataSource, IList(Of Decision))
dNew.ID = dList.Max(Function(d) d.ID) + 1

Filed under VB.Net

Talking about How to: Bind Windows Forms Controls to DBNull Database Values

02-Feb-1010 Leave a comment

Quote How to: Bind Windows Forms Controls to DBNull Database Values

Filed under VB.Net

How to: Bind Objects to Windows Forms DataGridView Controls

02-Feb-1010 Leave a comment

Taken from MSDN Link Here but adjusted to make abstract

Private Sub SetupDGVComboBoxToEnum()
    SetupDGVComboBoxColumnToEnumType(GetType(Decision.StatusIDEnum))
    DGVColumnStatusID.DataPropertyName = "StatusID"
    DGVColumnStatusID.Name = "Status"
End Sub

Private Sub SetupDGVComboBoxColumnToEnumType(ByVal enumType As Type)
    DGVColumnStatusID.DataSource = [Enum].GetValues(enumType)
End Sub

Filed under VB.Net

Most Recently Used for objects on a form

02-Feb-1010 Leave a comment

Probably other ways of doing this. However this is my quickly devised method. Using a MRUToolStripDropDownButton.

Need to call MRUAdd after loading an object


Private mruList As IList(Of T) 

Private Sub MRUAdd() 
    If mruList.Contains(Me.cPadMain) Then
        mruList.Remove(Me.cPadMain)
    End If

'Lambda
    If mruList.Where(Function(m) m.ID = cPadMain.ID).Count = 0 Then
        mruList.Insert(0, Me.cPadMain)
    End If 
    MRUDisplay()

End Sub 


Private Sub MRUDisplay() 
    MRUToolStripDropDownButton.DropDownItems.Clear()

    'LINQ
    Dim MRU As IEnumerable(Of PadMain) = From pm In mruList Order By pm.PadMaterial Descending 
    For Each pm As PadMain In MRU 
        Dim tsi As New ToolStripMenuItem 
        tsi.Tag = pm.ID
        tsi.Text = pm.Pad + " in " + pm.Material.Material + " " + pm.ID.ToString 
        MRUToolStripDropDownButton.DropDownItems.Insert(0, tsi) 
        If MRUToolStripDropDownButton.DropDownItems.Count > 10 Then 
            Exit For
        End If 
    Next 

End Sub

Filed under VB.Net

LINQ samples

02-Feb-1010 Leave a comment

To use LINQ need

Imports System.Linq

May need reference to System.Core and System.Data

‘LINQ
Dim MRU As IEnumerable(Of PadMain) = From pm In mruList OrderBy pm.PadMaterial

LINQ to Entity Framework

Private context As BC.SWT.EntityModel.SOPEntities

Dim EntityConnectionString = Configuration.ConfigurationManager.ConnectionStrings(“SOPEntities”).ConnectionString
context = New BC.SWT.EntityModel.SOPEntities(EntityConnectionString)

Dim CustomerQuery AsObjectQuery(OfCustomer) = context.Customers
Dim results = From a In CustomerQuery Select a.CustomerID, a.Customer1 OrderBy Customer1

Filed under Entity Framework, VB.Net Tagged with Entity Framework, LINQ

Lambda

02-Feb-1010 Leave a comment

Lamda Where


If cPadMain.PadHistoryList.Where(Function(h) h.IsNew = True).Count <> 0 Then 
    Dim cPadHistoryData As New PadHistoryData(Me.ConnectionStringSettings) 
    For Each ph As PadHistory In cPadMain.PadHistoryList.Where(Function(h) h.IsNew = True) 
        cPadHistoryData.Insert(ph)
    Next 
End If

Lamda Max

Dim dList As IList(Of Decision) = CType(DecisionBindingSource.DataSource, IList(Of Decision))
dNew.ID = dList.Max(Function(d) d.ID) + 1

Lamda check for repeats

Public Function IsSupplierPriorityOK() As Boolean
 
    'Lambda Check for repeats
    For Each cs1 As Costing.ComponentSupplier In Me.ComponentSupplierList.OrderBy(Function(h) h.Priority)
        Dim p1 As Integer = cs1.Priority
        If Me.ComponentSupplierList.Where(Function(h) h.Priority = p1).Count <> 1 Then
            Return False
        End If
    Next
    Return True
 
End Function