using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace NumericEx
{
    /************************************************************************/
    /* 希望实现的效果
     * 1.当数据在设定的最大值和最小值之间时，颜色是正常色
       2.当数据超出最大值时，颜色变为红色
       3.当数据低于最小值时，颜色变为蓝色
       4.当数据由超出最值范围变为在最值范围内时，颜色由异常色变为正常色*/
    /************************************************************************/
    public class NumericEx : NumericUpDown
    {
        /*public NumericEx() : base()
        {

        }*/

        public void SetValue(Decimal newValue, Decimal newMax, Decimal newMin, Decimal oldMax, Decimal oldMin)
        {
            if (newMax > oldMax)
            {
                this.Maximum = newMax;
                base.Maximum = newMax;
                this.Minimum = oldMin;
                this.BackColor = Color.Red;
                base.BackColor = Color.Red;
            }
            if (newMin < oldMin)
            {
                this.Minimum = newMin;
                this.Maximum = oldMax;
                this.BackColor = Color.SkyBlue;
            }
            this.Value = newValue;
            if (newMax <= oldMax)
            {
                this.Maximum = oldMax;
                this.Minimum = oldMin;
                this.BackColor = SystemColors.Window;
            }
            if (newMin >= oldMin)
            {
                this.Minimum = oldMin;
                this.Maximum = oldMax;
                this.BackColor = SystemColors.Window;
            }
            //this.Refresh();
        }
    }
}

//控件设定的最值范围是0~10
private void button2_Click(object sender, EventArgs e)
        {

            numericEx1.SetValue(12M, 12M, 0M, 10M, 0M);
          
        }