Enabled设置为False时,前景色和背景色也不改变的TextBox 并居中

1.公共方法

 

     public   class  MyTextBox : TextBox
    {
         protected   override   void  OnEnabledChanged(EventArgs e)
        {
             base .OnEnabledChanged(e);
             // 设置Enabled为False时
             if  ( this .Enabled)
            {
                 this .SetStyle(ControlStyles.UserPaint,  false );
               
            }
             else
                 this .SetStyle(ControlStyles.UserPaint,  true );
             // 再描绘
             this .Invalidate();
        }

         // 描绘TextBox
         protected   override   void  OnPaint(PaintEventArgs e)
        {
             base .OnPaint(e);
            System.Drawing.Brush b  =
                 new  System.Drawing.SolidBrush( this .ForeColor);

            StringFormat sf  =   new  StringFormat();
            sf.LineAlignment  =  StringAlignment.Center;
            sf.Alignment  =  StringAlignment.Center;
             // 描绘字符串
             // e.Graphics.DrawString(this.Text, this.Font, b, -1, 1);
            e.Graphics.DrawString( this .Text,  this .Font, b,  this .ClientRectangle, sf);

            b.Dispose();
        }
    }

 

 

2.页面 designer.cs修改为 MyTextBox