求助，如何在窗口控件panel动态判定是否存在多个chart，然后删除，重新动态创建新chart

以下代码执行总报错

    Dim pn As WinForm.Panel
    Dim chrt As WinForm.Chart
    For Each ctl As winform.control In e.form.controls("pn1").Children
        If e.form.controls("pn1").ExistControl(ctl.name) Then
           e.form.controls("pn1").RemoveControl(ctl.name)
        End If
    Next

很简单那，你创建的图表控件全部用char开头， 这样就可以遍历控件，凡是名称chart开头的，都是图表控件

代码写了很多测试都报错，具体如何写循环判定删除

Dim cnt as integer
For Each c As Winform.Control In e.Form.Controls
     if c.Name.Startswith("Chart") then
           cnt = cnt + 1
     end if
Next
if cnt > 0 then
     MessageBox.show(cnt & "个图表")
end if

注意名何区分大小写，chart不等于Chart

解决了

    For Each c As Winform.Control In e.Form.Controls
        If c.name.contains("chart") Then
            e.Form.RemoveControl(c.name)
        End If
    Next