Question

如何计算列中所有值的总和并将其显示在label.content中。

创建专栏：

    Dim c7 As New DataGridTextColumn()
    c7.Header = "Iznos"
    c7.Width = 100
    c7.Binding = New Binding("Iznos")
    gridRacun.Columns.Add(c7)

创建项目的类：

Class Item
Private _Cijena As String
Private _Rabat As String
Private _PC As String
Private _Iznos As String



Property Kolicina() As Integer
    Get
        Return _Kolicina
    End Get
    Set(ByVal value As Integer)
        Me._Kolicina = value
    End Set
End Property
Property Cijena() As Decimal
    Get
        Return _Cijena
    End Get
    Set(ByVal value As Decimal)
        Me._Cijena = value
    End Set
End Property

Property Iznos() As Decimal
    Get
        Return _Iznos
    End Get
    Set(ByVal value As Decimal)
        Me._Iznos = Me._Kolicina * Me.Cijena
    End Set
End Property
End Class

向datagrid添加项目：

     Dim item = New Item With {.Cijena = Globals.cijenaTempG, .Rabat = Globals.rabatG, .PC = 1.0, .Iznos = 1.0}
    gridRacun.Items.Add(item)

我想计算名为“Iznos”的列的SUM并将其显示在labelSum.content中

Answer 1

我认为您可以迭代datagridview的行并计算总和

dim sum = 0  
for each row as datagridviewrow in gricRacun.rows  
 dim cellValue  as double 
if not double.tryparse(row.cells(c7.index).value,cellValue) then cellValue = 0  
sum += cellValue  
next row

您可以在文本更改事件和其他事件中触发它并分配您想要的位置

Answer 2

该列绑定到项目的属性。对属性求和并将其公开给视图，而不是关注网格本身。

' Calculate the sum (using Linq).
Dim sum = gridRacun.Items.OfType(Of Item)().Sum(Function(item) item.Iznos)
' Update the label.
labelSum.Content = sum

现在剩下的就是找出何时触发计算。尝试收听集合何时更改，或者是否更新了任何项目的属性。

计算列中的值的总和

2 个答案: