本文整理汇总了VB.NET中System.Windows.Forms.Control.LostFocus事件的典型用法代码示例。如果您正苦于以下问题：VB.NET Control.LostFocus事件的具体用法？VB.NET Control.LostFocus怎么用？VB.NET Control.LostFocus使用的例子？那么恭喜您, 这里精选的事件代码示例或许可以为您提供帮助。
在下文中一共展示了Control.LostFocus事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1:
Private Sub TextBox1_Validating(ByVal sender As Object, _
ByVal e As System.ComponentModel.CancelEventArgs) _
Handles TextBox1.Validating
' If nothing is entered,
' an ArgumentException is caught; if an invalid directory is entered,
' a DirectoryNotFoundException is caught. An appropriate error message
' is displayed in either case.
Try
Dim directory As New System.IO.DirectoryInfo(TextBox1.Text)
directory.GetFiles()
ErrorProvider1.SetError(TextBox1, "")
Catch ex1 As System.ArgumentException
ErrorProvider1.SetError(TextBox1, "Please enter a directory")
Catch ex2 As System.IO.DirectoryNotFoundException
ErrorProvider1.SetError(TextBox1, _
"The directory does not exist." & _
"Try again with a different directory.")
End Try
End Sub
' This method handles the LostFocus event for TextBox1 by setting the
' dialog's InitialDirectory property to the text in TextBox1.
Private Sub TextBox1_LostFocus(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles TextBox1.LostFocus
OpenFileDialog1.InitialDirectory = TextBox1.Text
End Sub
' This method demonstrates using the ErrorProvider.GetError method
' to check for an error before opening the dialog box.
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
'If there is no error, then open the dialog box.
If ErrorProvider1.GetError(TextBox1) = "" Then
Dim dialogResult As DialogResult = OpenFileDialog1.ShowDialog()
End If
End Sub