mes-client/FileWatcher/Pagination.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Windows.Forms;

namespace FileWatcher
{
    public partial class Pagination : UserControl
    {
        #region 变量
        //申明一些全局变量用来在函数之间传递参数
        int PageSize;
        /// <summary>
        /// 当前页码
        /// </summary>
        public int Current_Page;
        /// <summary>
        /// 总页数
        /// </summary>
        int TotalPageCount;
        /// <summary>
        /// 一页展示的行数
        /// </summary>
        int RowCount;
        /// <summary>
        /// 主表的ID
        /// </summary>
        string Table_ID;
        /// <summary>
        /// 查询的表名
        /// </summary>
        string TableName;
        string Caller;
        /// <summary>
        /// 查询的字段
        /// </summary>
        string Field;
        /// <summary>
        /// 需要添加的图像操作列
        /// </summary>
        DataGridViewImageColumn dgic = null;
        string Condition = "";
        /// <summary>
        /// 删除按钮是否能够点击
        /// </summary>
        bool DeleteEnable1;
        /// <summary>
        /// 添加按钮是否能够点击
        /// </summary>
        bool AddEnable1;
        DataGridView Dgv;
        DataTable dt;
        DataHelper dh = SystemInf.dh;

        public bool DeleteEnable
        {
            get
            {
                return DeleteEnable1;
            }

            set
            {
                DeleteEnable1 = value;
            }
        }

        public bool AddEnable
        {
            get
            {
                return AddEnable1;
            }

            set
            {
                AddEnable1 = value;
            }
        }
        #endregion



        public Pagination()
        {
            InitializeComponent();
            //鼠标经过控件的时候显示文字
            toolTip1.SetToolTip(DownLoadTemplet, "下载模板");
            toolTip1.SetToolTip(UpLoadData, "上传数据");
            toolTip1.SetToolTip(ExportExcel, "导出数据");
            toolTip1.SetToolTip(Delete, "删除数据");
            toolTip1.SetToolTip(FirstPage, "第一页");
            toolTip1.SetToolTip(PreviousPage, "上一页");
            toolTip1.SetToolTip(NextPage, "下一页");
            toolTip1.SetToolTip(LastPage, "最后一页");
        }

        public delegate void OnCheckedChange(object sender, EventArgs e);

        //定义事件
        public event OnCheckedChange UserControlCheckedChanged;

        /// <summary>
        /// 将数据绑定到数据源
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="TableName"></param>
        /// <param name="Field"></param>
        public void BindDataToNavigator(DataGridView dgv, string tableName, string field, string ID, string caller, string condition, params DataGridViewImageColumn[] operate)
        {
            //将传来的值赋给全局变量
            Dgv = dgv;
            TableName = tableName;
            Table_ID = ID;
            Caller = caller;
            Field = field;
            Condition = condition;
            //每页显示的数据数量
            PageSize = int.Parse(this.ShowItemsNum.Text);
            //当前在多少页
            Current_Page = int.Parse(this.CurrentPage.Text);
            //获取记录的总行数
            RowCount = dh.getRowCount(TableName);
            //分页获取数据，先取第一页的
            dt = dh.getFieldsDatasByPageing(TableName, field, Current_Page, PageSize, Caller, condition);
            //给BindingSource指定一个DataTable
            RefreshTotalCount();
            //给父控件的DataGridView绑定数据
            dgv.DataSource = dt;
            dt.Dispose();
            for (int i = 0; i < operate.Length; i++)
            {
                dgic = operate[i];
                AddOperateColumnToDgv();
            }
        }

        //获取分页的数据
        public void GetPageData()
        {
            this.TotalPage.Text = "/ " + TotalPageCount.ToString();
            CurrentPage.Text = Current_Page.ToString();
            //取分页数据
            dt = dh.getFieldsDatasByPageing(TableName, Field, Current_Page, PageSize, Caller, Condition);
            //赋值给父窗体的DataGridView
            Dgv.DataSource = dt;
            AddOperateColumnToDgv();
        }

        //判断是否需要添加操作列
        private void AddOperateColumnToDgv()
        {
            if (dgic != null)
            {
                if (Dgv.Columns[dgic.Name] != null)
                {
                    Dgv.Columns.Remove(Dgv.Columns[dgic.Name]);
                }
                dgic.DisplayIndex = Dgv.Columns.Count;
                Dgv.Columns.Add(dgic);
            }
        }

        //第一页
        private void FirstPage_Click(object sender, EventArgs e)
        {
            Current_Page = 1;
            GetPageData();
            RefreshTotalCount();
        }

        //往前翻一页
        private void PreviousPage_Click(object sender, EventArgs e)
        {
            if (Current_Page > 1)
            {
                Current_Page--;
            }
            GetPageData();
            RefreshTotalCount();
        }

        //往后翻一页
        private void NextPage_Click(object sender, EventArgs e)
        {
            if (Current_Page < TotalPageCount)
            {
                Current_Page++;
            }
            GetPageData();
            RefreshTotalCount();
        }

        //最后一页
        private void LastPage_Click(object sender, EventArgs e)
        {
            Current_Page = TotalPageCount;
            CurrentPage.Text = TotalPageCount.ToString();
            GetPageData();
            RefreshTotalCount();
        }

        private void ExportExcel_Click(object sender, EventArgs e)
        {
            ExcelExport("Data");
        }

        //用户手动输入页码的时候获取数据
        private void CurrentPage_KeyDown(object sender, KeyEventArgs e)
        {
            //判断用户是否按下回车键
            if (e.KeyValue == (int)Keys.Enter)
            {
                //判断是否是数字类型的
                if (IsNumOrNull(CurrentPage.Text))
                {
                    Current_Page = int.Parse(CurrentPage.Text);
                    //判断是否是合理的页码
                    if (Current_Page >= 1 && Current_Page <= TotalPageCount)
                    {
                        GetPageData();
                    }
                    else
                    {
                        MessageBox.Show("请输入正确的页码");
                    }
                }
                else
                {
                    CurrentPage.Text = "1";
                    MessageBox.Show("页码必须是不为空的正整数");
                }
            }
        }

        //判断是不是数字或者空值
        private bool IsNumOrNull(object Num)
        {
            //判断是否是数组
            foreach (char c in Num.ToString())
            {
                if (!char.IsDigit(c))
                {
                    return false;
                }
            }
            //判断是否为空值
            if (Num.ToString() == "")
            {
                return false;
            }
            return true;
        }

        //刷新总页数
        private void RefreshTotalCount()
        {
            //获取记录的总行数
            if (Condition.Trim() != "")
            {
                RowCount = dh.getRowCount(TableName, Condition);
            }
            else
            {
                RowCount = dh.getRowCount(TableName);
            }
            //取模后+1来确定总的页数
            TotalPageCount = RowCount / PageSize + 1;
            //设置总页数Label显示的值
            TotalPage.Text = "/ " + TotalPageCount.ToString();
        }

        //删除按钮
        private void Delete_Click(object sender, EventArgs e)
        {
            //CheckBox需要失去焦点的时候值才变化,手动使焦点到按钮这
            Delete.Focus();
            UserControlCheckedChanged?.Invoke(sender, new EventArgs());
            {
                List<string> DeleteID = new List<string>();
                for (int i = 0; i < Dgv.Rows.Count; i++)
                {
                    if (Dgv.Rows[i].Cells["Choose"].FormattedValue.ToString() == "True")
                    {
                        DeleteID.Add(Dgv.Rows[i].Cells[Table_ID].FormattedValue.ToString());
                    }
                }
                if (DeleteID.ToArray().Length > 0)
                {
                    //取的配置的数据是从DataTable里面判断的，取的是固定字段的Dgv用第二种
                    string tablename = TableName;
                    if (TableName.Contains("join"))
                    {
                        tablename = TableName.Substring(0, TableName.IndexOf("left")).Trim();
                    }
                    dh.DeleteDataByID(tablename, Table_ID, DeleteID.ToArray());
                    GetPageData();
                    RefreshTotalCount();
                }
            }
        }

        //添加新的数据
        private void Add_Click(object sender, EventArgs e)
        {
            ((DataTable)Dgv.DataSource).Rows.Add();
        }

        private void DownLoadTemplet_Click(object sender, EventArgs e)
        {
            ExcelExport("Templet");
        }

        //选择导出Excel时是选择导出数据的还是模板
        private void ExcelExport(string DataOrTemplet)
        {
           
        }

        private void UpLoadData_Click(object sender, EventArgs e)
        {
            
        }

        private void ShowItemsNum_SelectedValueChanged(object sender, EventArgs e)
        {
            if (IsNumOrNull(ShowItemsNum.SelectedItem))
            {
                PageSize = int.Parse(ShowItemsNum.SelectedItem.ToString());
                //推荐合理的行数
                //int AdviceNum = DgvHeight / DgvRowHeight - 3;
                if (PageSize >= 1)
                {
                    RefreshTotalCount();
                    GetPageData();
                }
                else
                {
                    MessageBox.Show("请输入正确的数字");
                }
            }
            else
            {
                MessageBox.Show("页码必须是不为空的正整数");
            }
        }

        private void Pagination_Load(object sender, EventArgs e)
        {
            Delete.Enabled = DeleteEnable1;
            Add.Enabled = AddEnable1;
        }
    }
}