C#下一页按钮

Question

上一页 下一页按钮 list<>没有内容时 下一页不能按了 当按buttn时索引会变化  求好朋友给个思路  

Answer 1

判断list如果为空，下一页按钮的Enable设置为false.

Answer 2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace DatagirdviewTurn
{
    public partial class DatagirdvieTurnPages : UserControl
    {
        private int pageSize = 0;     // 每页显示行数   
        private int pageCount = 0;    // 页数=总记录数/每页显示行数   
        private int recordCount = 0;  // 总记录数   
        private int curPageNum = 0;   // 当前页号    
        private int curRowNum = 0;    // 当前记录行   
        private DataSet DS = new DataSet();
        private DataTable dtInfo = new DataTable();  
        public DatagirdvieTurnPages()
        {
            InitializeComponent();
          
        }
        private void InitDataSet()
        {
            pageSize = 10;                         // 设置页面行数     
            recordCount = dtInfo.Rows.Count;
            pageCount = (recordCount / pageSize);  // 计算出总页数  
            if ((recordCount % pageSize) > 0) { pageCount++; }
            curPageNum = 1;                        // 当前页数从1开始   
            curRowNum = 0;                         // 当前记录数从0开始     
            LoadData();
        }  
        private void LoadData()
        {
            int startPos = 0;                   // 当前页面开始记录行     
            int endPos = 0;                     // 当前页面结束记录行   
            DataTable dtTemp = dtInfo.Clone();  // 克隆DataTable结构框架     
            if (curPageNum == pageCount)
            {
                endPos = recordCount;
            }
            else
            {
                endPos = pageSize * curPageNum;
            }
            startPos = curRowNum;
            label1.Text = string.Format("第{0}页/共{1}页", curPageNum, pageCount);        // 从元数据源复制记录行    
            for (int i = startPos; i < endPos; i++)
            {
                dtTemp.ImportRow(dtInfo.Rows[i]);
                curRowNum++;
            }            dataGridView1.DataSource = dtTemp;
        }        private void DatagirdvieTurnPages_Load(object sender, EventArgs e)
        {
         
           
        }
        /// <summary>
        /// 初始化
        /// </summary>
        public void InitSys(DataTable Dt_Table)
        {
            if (Dt_Table.Rows.Count!=0)
            {
                dtInfo = Dt_Table;
                InitDataSet(); 
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            switch (((Button)sender).Text)
            {
                case "上一页":
                    curPageNum--;
                    if (curPageNum <= 0)
                    {
                        curPageNum = 0;
                        MessageBox.Show("已经是第一页，请点击“下一页”查看！");
                        return;
                    }
                    curRowNum = pageSize * (curPageNum - 1);
                    LoadData();
                    break;
                case "下一页":
                    curPageNum++;
                    if (curPageNum > pageCount)
                    {
                        curPageNum = pageCount;
                        MessageBox.Show("已经是最后一页，请点击“上一页”查看！");
                        return;
                    }
                    curRowNum = pageSize * (curPageNum - 1);
                    LoadData();
                    break;
            
                default:
                    break;
            }  
        }        private void button2_Click(object sender, EventArgs e)
        {
            switch (((Button)sender).Text)
            {
                case "上一页":
                    curPageNum--;
                    if (curPageNum <= 0)
                    {
                        curPageNum = 0;
                        MessageBox.Show("已经是第一页，请点击“下一页”查看！");
                        return;
                    }
                    curRowNum = pageSize * (curPageNum - 1);
                    LoadData();
                    break;
                case "下一页":
                    curPageNum++;
                    if (curPageNum > pageCount)
                    {
                        curPageNum = pageCount;
                        MessageBox.Show("已经是最后一页，请点击“上一页”查看！");
                        return;
                    }
                    curRowNum = pageSize * (curPageNum - 1);
                    LoadData();
                    break;
            
                default:
                    break;
            }  
        }    // 三个按钮的事件   
    }
}

Answer 3

  private int m_CurrentPage = 0;//当前页        private int m_PagesCount = 0;//页码总数        private List<string> ss = new List<string>();        /// <summary>
        /// 下一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnNext_Click(object sender, EventArgs e)
        {
            m_CurrentPage += 1;
            if (m_CurrentPage == m_PagesCount)
            {
                this.btnNext.Enabled = false;
            }
        }

Answer 4

谢谢楼上的好朋友们  
声明一个全局变量 int index=0;
然后在btn事件 index++ 或index--    index是list集合的索引就可以了

Answer 5

 int index = 0;
List<PersonInfo> lst = new List<PersonInfo>();
private void btnNext_Click(object sender, EventArgs e)
        {
            index++;
            PersonInfo pe = lst[index];
           // MessageBox.Show(p.Email,index.ToString());
            txtName.Text = pe.Name;
            txtAge.Text = pe.Age.ToString(); 
            txtAddress.Text = pe.Address;
            txtEmail.Text = pe.Email;
            txtSex.Text = pe.Sex;  
        }
新手代码写的有点乱套  哈哈