winform 自定义分页控件 及DataGridview数据绑定

Posted 2020-09-08

 

 

分页效果如上图所示，用到的控件均为基本控件 ，其方法如下

右击项目-添加-新建项 选择用户控件 然后在用户控件中拖入所需要的Label，Button，Text

用户控件全部代码：

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace One.UI
{
    public partial class PagerControl : UserControl
    {
        public PagerControl()
        {
            InitializeComponent();
        }
        #region 分页字段和属性

        private int pageIndex = 1;
        /// <summary>  
        /// 当前页数  
        /// </summary>  
        public virtual int PageIndex
        {
            get { return pageIndex; }
            set { pageIndex = value; }
        }

        private int pageSize = 100;
        /// <summary>  
        /// 每页记录数  
        /// </summary>  
        public virtual int PageSize
        {
            get { return pageSize; }
            set { pageSize = value; }
        }

        private int recordCount = 0;
        /// <summary>  
        /// 总记录数  
        /// </summary>  
        public virtual int RecordCount
        {
            get { return recordCount; }
            set { recordCount = value; }
        }

        private int pageCount = 0;
        /// <summary>  
        /// 总页数  
        /// </summary>  
        public int PageCount
        {
            get
            {
                if (pageSize != 0)
                {
                    pageCount = GetPageCount();
                }
                return pageCount;
            }
        }

        #endregion
        #region 页码变化时触发事件
        public event EventHandler OnPageChanged;

        #endregion

        #region 分页及相关事件功能实现

        /// <summary>  
        /// 设窗体控件全部可用  
        /// </summary>  
        private void SetFormCtrEnabled()
        {
            linkFirst.Enabled = true;
            linkPrevious.Enabled = true;
            linkNext.Enabled = true;
            linkLast.Enabled = true;
                   }

        /// <summary>  
        /// 计算总页数  
        /// </summary>  
        /// <returns></returns>  
        private int GetPageCount()
        {
            if (PageSize == 0)
            {
                return 0;
            }
            int pageCount = RecordCount / PageSize;
            if (RecordCount % PageSize == 0)
            {
                pageCount = RecordCount / PageSize;
            }
            else
            {
                pageCount = RecordCount / PageSize + 1;
            }
            return pageCount;
        }
        /// <summary>  
        /// 用于客户端调用  
        /// </summary>  
        public void DrawControl(int count)
        {
            recordCount = count;
            DrawControl(false);
        }
        /// <summary>  
        /// 根据不同的条件，改变页面控件的呈现状态  
        /// </summary>  
        private void DrawControl(bool callEvent)
        {

            txtCurrentPage.Text = PageIndex.ToString();//当前页
            lblPageCount.Text = PageCount.ToString();//总页数
            lblTotalCount.Text = RecordCount.ToString();//总记录数
            txtPageSize.Text = PageSize.ToString();//每页记录数

            if (callEvent && OnPageChanged != null)
            {
                OnPageChanged(this, null);//当前分页数字改变时，触发委托事件  
            }
            SetFormCtrEnabled();
            if (PageCount == 1)//有且仅有一页时  
            {
                linkFirst.Enabled = false;
                linkPrevious.Enabled = false;
                linkNext.Enabled = false;
                linkLast.Enabled = false;
                           }
            else if (PageIndex == 1)//当前页为第一页时  
            {
                linkFirst.Enabled = false;
                linkPrevious.Enabled = false;
            }
            else if (PageIndex == PageCount)//当前页为最后一页时  
            {
                linkNext.Enabled = false;
                linkLast.Enabled = false;
            }
        }

        #endregion

        #region 相关控件事件

        //首页按钮  
        private void linkFirst_Click(object sender, EventArgs e)
        {
            PageIndex = 1;
            DrawControl(true);
        }

        //上一页按钮  
        private void linkPrevious_Click(object sender, EventArgs e)
        {
            PageIndex = Math.Max(1, PageIndex - 1);
            DrawControl(true);
        }

        //下一页按钮  
        private void linkNext_Click(object sender, EventArgs e)
        {
            PageIndex = Math.Min(PageCount, PageIndex + 1);
            DrawControl(true);
        }

        //尾页按钮  
        private void linkLast_Click(object sender, EventArgs e)
        {
            PageIndex = PageCount;
            DrawControl(true);
        }

        /// <summary>  
        /// 按下enter键，执行跳转页面功能  
        /// </summary>  
        private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e)
        {
             int num = 0;
            if (int.TryParse(txtCurrentPage.Text.Trim(), out num) && num > 0)
            {
                PageIndex = num;
                DrawControl(true);
            }
        }

        /// <summary>  
        /// 跳转页数限制  
        /// </summary>  
        private void txtCurrentPage_TextChanged(object sender, EventArgs e)
        {
            int num = 0;
            if (int.TryParse(txtCurrentPage.Text.Trim(), out num) && num > 0)
            {   //TryParse 函数，将字符串转换成等效的整数，返回bool型，判断是否转换成功。  
                //输入除数字以外的字符是转换不成功的  

                if (num > PageCount)   //输入数量大于最大页数时，文本框自动显示最大页数  
                {
                    txtCurrentPage.Text = PageCount.ToString();
                }
            }
        }

      
        #endregion
        bool isTextChanged = false;
        /// <summary>  
        /// 每页显示的记录数改变时  
        /// </summary>  
        private void txtPageSize_TextChanged(object sender, EventArgs e)
        {
            int num = 0;
            //输入不符合规范时，默认设置为100  
            if (!int.TryParse(txtPageSize.Text.Trim(), out num) || num <= 0)
            {
                num = 100;
                txtPageSize.Text = "100";
            }
            else
            {
                isTextChanged = true;

            }
            pageSize = num;
        }
        /// <summary>  
        /// 光标离开 每页设置文本框时，显示到首页  
        private void txtPageSize_Leave(object sender, EventArgs e)
        {
            if (isTextChanged)
            {
                isTextChanged = false;
                linkFirst_Click(null, null);
            }
        }

          }
}

用户控件完成后，生成解决方案就会在左侧工具栏中看到刚写好的分页控件，拖入到需要分页的窗体中赋值调用即可；

在窗体加载事件中激活分页控件方法

 private void OneForm_Load(object sender, EventArgs e)
        {
                       ShowData();
            //激活OnPageChanged事件  
            pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);

        }

分页控件页码发生变化时执行方法

 private void pagerControl1_OnPageChanged(object sender, EventArgs e)
        {
            ShowData();
        }

绑定Datagridview方法

 private void ShowData()
        {
            int count;///4.6日
            string strWhere = " 1=1 ";          
//可以添加where条件
                      
            pagerControl1.PageSize = 30;//设置显示记录数
            ds = bll.GetList(pagerControl1.PageIndex, pagerControl1.PageSize, strWhere, out count);//4.6
            dataGridViewX1.DataSource = ds.Tables[0];
            pagerControl1.DrawControl(count);
        }

bll.GetList为数据读取返回dataset类型

 public DataSet GetList(int PageIndex, int PageSize, string strWhere, out int count)
        {
            StringBuilder strSql = new StringBuilder();
            //strSql.Append(" select * from ( ");
            strSql.Append(" select   ROW_NUMBER() over(order by Material_TimeAdd) num,*  ");
            strSql.Append("  FROM tabel");
if (strWhere.Trim() != "")
            {
                strSql.Append(" where " + strWhere);
            }
            count = DbHelperSQL.Query(strSql.ToString()).Tables[0].Rows.Count;

            strSql.Append(" ) t where t.num between " + ((PageIndex - 1) * PageSize + 1) + " and " + PageSize * PageIndex);
            DataSet ds = DbHelperSQL.Query(" select * from ( " + strSql.ToString());

            return ds;


        }

第一次写东西，希望能够帮助需要的人。。。。。。