限制 OpenFileDialog 的多选 [英] Limit OpenFileDialog's Multiselect

问题描述

我有一个 OpenFileDialog，它的 MultiSelect 属性是 ON.我的问题是如何限制要选择的项目数量，例如只能选择 5 个项目?

I have a OpenFileDialog and its MultiSelect property is ON. My question is how can I limit the number of items to be selected, for example 5 items only?

谢谢

推荐答案

当用户单击确定"按钮时，您可以使用 FileOk 事件检查用户选择的文件.如果您不满意，则显示一条消息并将 CancelEventArgs.Cancel 属性设置为 True 以防止对话框关闭.像这样:

You can use the FileOk event to check the file(s) selected by the user when he clicks the OK button. If you are not happy then display a message and set the CancelEventArgs.Cancel property to True to prevent the dialog from closing. Like this:

    Dim dlg As New OpenFileDialog()
    dlg.Multiselect = True
    AddHandler dlg.FileOk, Sub(s, ce)
                               If dlg.FileNames.Length > 5 Then
                                   MessageBox.Show("Please select no more than 5 files")
                                   ce.Cancel = True
                               End If
                           End Sub
    If dlg.ShowDialog = Windows.Forms.DialogResult.OK Then
        '' etc...
    End If

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