spinner.ascx.cs

来自「这是asp.net^和Visual C++Sharp编写的串并口通讯的书籍 源代」· CS 代码 · 共 110 行

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Controls_Spinner : System.Web.UI.UserControl
{
    private int m_minValue;
    private int m_maxValue = 100;
    private int m_currentNumber = 0;
    public int MinValue//设置为可读写属性
    {
        get//读属性
        {
            return m_minValue;
        }
        set//写属性
        {
            if (value >= this.MaxValue)
            {
                throw new Exception("MinValue must be less than MaxValue.");
            }
            else
            {
                m_minValue = value;
            }
        }
    }

    public int MaxValue
    {
        get
        {
            return m_maxValue;
        }
        set
        {
            if (value <= this.MinValue)
            {
                throw new
                    Exception("MaxValue must be greater than MinValue.");
            }
            else
            {
                m_maxValue = value;
            }
        }
    }

    public int CurrentNumber
    {
        get
        {
            return m_currentNumber;
        }
    }

    protected void Page_Load(Object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            m_currentNumber =
                Int16.Parse(ViewState["currentNumber"].ToString());
        }
        else
        {
            m_currentNumber = this.MinValue;
        }
        DisplayNumber();
    }
    //自定义一个DisplayNumber()，用来获取当前图书价格
    protected void DisplayNumber()
    {
        textNumber.Text = this.CurrentNumber.ToString();
        ViewState["currentNumber"] = this.CurrentNumber.ToString();
    }

    protected void buttonUp_Click(Object sender, EventArgs e)
    {
        if (m_currentNumber == this.MaxValue)
        {
            m_currentNumber = this.MinValue;
        }
        else
        {
            m_currentNumber += 1;
        }
        DisplayNumber();//调用DisplayNumber方法
    }

    protected void buttonDown_Click(Object sender, EventArgs e)
    {
        if (m_currentNumber == this.MinValue)
        {
            m_currentNumber = this.MaxValue;
        }
        else
        {
            m_currentNumber -= 1;
        }
        DisplayNumber();//调用DisplayNumber方法
    }
}