winform设置边框颜色不像webform那么简单，可以通过设置FlatAppearance，也可以通过重绘实现。
一、设置按钮本身属性
buttonBubufx.FlatStyle = FlatStyle.Flat;
buttonBubufx.BackColor = Color.SkyBlue;
buttonBubufx.FlatAppearance.BorderColor = buttonBubufx.BackColor;
二、重绘，设置按钮的Region
private static int WM_NCPAINT = 0x0085;
private static int WM_ERASEBKGND = 0x0014;
private static int WM_PAINT = 0x000F;
[DllImport("user32.dll")]
static extern IntPtr GetDCEx(IntPtr hwnd, IntPtr hrgnclip, uint fdwOptions);
[DllImport("user32.dll")]
static extern int ReleaseDC(IntPtr hwnd, IntPtr hDC);
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_NCPAINT || m.Msg == WM_ERASEBKGND || m.Msg == WM_PAINT)
{
IntPtr hdc = Get
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