Vb.Net - 动态更改文本框背景颜色的类 [英] Vb.Net - Class to Change Textbox BackColor Dynamically

问题描述

我想知道如何创建一个类来更改表单内的每个文本框 BackColor.更具体:

I'd like to know how to create a Class to change each textbox BackColor inside a Form. To be more Specific:

1. 当文本框为空时，文本框 BackColor 为白色.
2. 当文本框获得焦点时，文本框的BackColor发生变化.
3. 当文本框有任何文本时，文本框的背景颜色会发生变化.
4. 当文本框失去焦点时，文本框的BackColor发生变化.

目前，我正在这样做.

Private Sub tb_Login_Enter(sender As Object, e As EventArgs) Handles tb_Login.Enter
    tb_Login.BackColor = Color.LightCyan
End Sub

Private Sub tb_Login_Leave(sender As Object, e As EventArgs) Handles tb_Login.Leave
    If tb_Login.Text <> "" Then
        tb_Login.BackColor = Color.LightGreen
    Else
        tb_Login.BackColor = Color.White
    End If

但是，我的 from 中有很多 TextBox，那么，如何为它创建一个 Class 呢?

But, I have many TextBox in my from, so, how can I create a Class for it?

谢谢

推荐答案

您需要做的就是从 TextBox 控件继承.

All you need to do is inherit from the TextBox control.

Public Class TextBoxEx
    Inherits TextBox

    Private Sub TextBoxEx_Enter(sender As Object, e As EventArgs) Handles Me.Enter
        Me.BackColor = Color.LightCyan
    End Sub

    Private Sub TextBoxEx_Leave(sender As Object, e As EventArgs) Handles Me.Leave
        If Me.Text <> "" Then
            Me.BackColor = Color.LightGreen
        Else
            Me.BackColor = Color.White
        End If
    End Sub
End Class

构建您的项目，然后用新的 TextBoxEx 控件替换您的 TextBox 控件.

Build your project and then replace your TextBox controls with the new TextBoxEx control.

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