带边框底部的文本框仅在Widnows表单中 [英] TextBox with border bottom only in Widnows Forms

问题描述

我需要一个文本框，其底边框需要为两个像素，并且颜色为蓝色?

I need a textbox whose bottom border needs to be two pixel and color blue? How to do it?

推荐答案

通过在派生类中重写方法OnPaint.如果需要更多空间用于此声明，则还需要使用y覆盖方法SetClientSizeCore来调整客户端大小.
请参阅:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.onpaint.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setclientsizecore.aspx [ ^ ].

除了覆盖方法OnPaint，您还可以处理事件Paint，但是如果仍然必须创建派生类，则没有太大意义:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.paint.aspx [ ^ ].

渲染时，不要重复常见的错误:不要创建类System.Drawing.Graphics的实例，而是使用事件参数parameter中传递的实例.

—SA

By overriding of the method OnPaint in the derived class. If you need more room for this declaration, you would also need to adjust the client size using y overriding the method SetClientSizeCore.

Please see:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.onpaint.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setclientsizecore.aspx[^].

Instead of overriding of the method OnPaint you can also handle the event Paint, but it makes not much sense if you have to create a derived class anyway:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.paint.aspx[^].

When rendering, don''t repeat a common mistake: don''t create an instance of the class System.Drawing.Graphics, instead, use the one passed in the event argument parameter.

—SA

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