DatePicker返回颜色更改 [英] DatePicker Back color Change

问题描述

我在我的VB.NET应用程序中使用了Datepicker，我尝试更改背景颜色并使用下面的代码

  protected  覆盖  void  WndProc（ ref  System.Windows.Forms.Message m）
 {
  if （m.Msg == WM_ERASEBKGND）
 {
 Graphics g = Graphics.FromHdc（< big> < /   big  >  m.WParam 的）; 
 g.FillRectangle（ new  SolidBrush（_backColor），ClientRectangle）; 
 g.Dispose（）; 
  return ; 
} 
 
  base  .WndProc（ ref  m）; 
} 

但我得到了Exception，任何人都帮助我

解决方案

<$ c有什么问题$ c> System.Windows.Forms.DateTimePicker.BackColor = ... ？请参阅：

http://msdn.microsoft.com/en-us/library/system.windows.forms.datetimepicker%28v=vs.110%29.aspx [ ^ ]，

http://msdn.microsoft.com/en- us / library / 0625h0ta（v = vs.110）.aspx [ ^ ]。



选择直接低级别通常不是一个好主意Windows消息处理，因为它可能严重损害代码的平台可移植性。在某些情况下，你必须这样做，以及P / Invoke，但除非真的需要，否则最好一定要避免它......



< DD> -SA

I have used Datepicker in my VB.NET application , i tried change the backcolor and use the below code

protected override void WndProc(ref System.Windows.Forms.Message m)
{
     if(m.Msg == WM_ERASEBKGND)
     {
       Graphics g = Graphics.FromHdc(<big></big>m.WParam);
       g.FillRectangle(new SolidBrush(_backColor), ClientRectangle);
       g.Dispose();
       return;
     }

     base.WndProc(ref m);
}

But i got Exception anyone help me

解决方案

What's wrong with System.Windows.Forms.DateTimePicker.BackColor = …? Please see:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datetimepicker%28v=vs.110%29.aspx[^],
http://msdn.microsoft.com/en-us/library/0625h0ta(v=vs.110).aspx[^].

It is usually not a good idea to opt for direct low-level Windows message handling, as it can seriously compromise platform portability of your code. In certain cases, you have to do it, as well as P/Invoke, but it's the best to avoid it by all means unless this is really needed…

—SA

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