Question

我是Visual Basic的新手。我有一个小程序看起来像这样。 https://www.dropbox.com/s/xr44pxp3n79atkk/wall.png

它将通过累加所有墙面积来计算总面积。

Public Sub btnWallAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnWallAdd.Click
    FlowLayoutPanel1.Controls.Clear()
    FlowLayoutPanel1.AutoScroll = True

    For i As Integer = 1 To Val(txtWallNo.Text)
        Dim Width As New TextBox()
        Dim Height As New TextBox()

        Width.Name = "Width" & i
        Width.Text = Width.Name
        Height.Name = "Height" & i
        Height.Text = Height.Name

        FlowLayoutPanel1.Controls.Add(Width)
        FlowLayoutPanel1.Controls.Add(Height)

    Next
End Sub

我已根据用户输入的数字成功创建了动态文本框，但我不知道如何从这些文本框中获取值并添加它们。请教我怎么做。非常感谢你！抱歉我的英文！

Answer 1

您可以按名称访问控件，如下所示：

Dim txtWidth As TextBox = FlowLayoutPanel1.Controls.Item("Width" & i)

或者，如果您启用了选项严格，则需要明确说明类型转换：

Dim txtWidth As TextBox = CType(FlowLayoutPanel1.Controls.Item("Width" & i.ToString()), TextBox)

例如，要在所有墙上添加区域，您可以执行以下操作：

Public Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
    Dim totalArea As Decimal = 0
    For i As Integer = 1 To Val(txtWallNo.Text)
        Dim txtWidth As TextBox = CType(FlowLayoutPanel1.Controls.Item("Width" & i.ToString()), TextBox)
        Dim txtHeight As TextBox = CType(FlowLayoutPanel1.Controls.Item("Height" & i.ToString()), TextBox)
        totalArea = totalArea + (Decimal.Parse(txtHeight.Text) * Decimal.Parse(txtWidth.Text))
    Next
    lblResult.Text = totalArea.ToString()
End Sub

如何在动态生成的文本框中获取值

1 个答案: