VB.NET===textchanged与keypress的区别例程说明

Public Class Form1

    Private Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
        Label1.Text = Label1.Text + TextBox1.Text + vbCrLf
    End Sub

    Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
        If Asc(e.KeyChar) = 13 Then
            Label2.Text = Label2.Text + TextBox2.Text + vbCrLf
        End If
    End Sub
End Class
 

运行结果：

=======textchanged与keypress的区别========

textchanged：当text的属性值发生改变时，就会触发textchanged事件。相当于说每当输入一个字符的时候就会触发textchanged事件；

keypress：在输入字符或字符串后需要判断按下的键，（主要时判断键盘按键对应的Asc码值），此时才会触发keypress事件。