Question

我有发票需求汇总单元gridview

Number     Description      Price     Qty    Total     Discount    Grand Total
5050       Screen           50        1      50        5           45
6060       Case             100       2      200       50          150

当我更改price，qty或discount的值时，我需要它来动态计算总计和总计。

Answer 1

我做了一个小例子（https://github.com/anderson-rancan/stackoverflow_31950624），所以：

使用属性，因此您的数据绑定可以正确使用您的代码

Private _description As String

Public Property Description() As String
    Get
        Return Me._description
    End Get
    Set(ByVal value As String)
        If Not (value = Me._description) Then
            Me._description = value
            Me.NotifyPropertyChanged()
        End If
    End Set
End Property

使用INotifyPropertyChanged更新您的表单和其他结构

Public MustInherit Class BusinessObject
    Implements INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

    Protected Sub NotifyPropertyChanged(<CallerMemberName()> Optional ByVal propertyName As String = Nothing)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
    End Sub

End Class

在您的商务对象中添加您的商务规则，以便他们自行更新

Private Sub Recalculate()
    Me.GrandTotal = Me._shopItems.Sum(Function(item) item.GrandTotal)
End Sub

将数据绑定添加到表单对象

Me._binding = New BindingSource()
Me._binding.DataSource = New Shop()
Me._binding.DataMember = "ShopItems"

Me.ShopItemsDataGridView.DataSource = Me._binding
Me.ShopItemsDataGridView.AutoGenerateColumns = True

使用这些方法，您可以自动重新计算总数并更新表单。

如果您需要更多信息，请使用Google for WinForms DataBinding或类似的东西。

选择行数据网格和单元格

1 个答案: