tijian_jichuang/Code/SOH.Kernel/Common/ExcelDC.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Collections;
using System.Reflection;
using System.Windows.Forms;
using xiaoy.Excel;
using WinForm_Test;
using System.IO;

namespace SOH.Common
{
    public class ExcelDC
    {
        public DataTable GetDgvToTable(DataGridView dgv)
        {
            DataTable dt = new DataTable();

            for (int count = 0; count < dgv.Columns.Count; count++)
            {
                if (dgv.Columns[count].Visible == true)
                {
                    DataColumn dc = new DataColumn(dgv.Columns[count].HeaderText.ToString());
                    dt.Columns.Add(dc);
                }
            }
            DataRow dr = dt.NewRow();
            for (int i = 0; i < dgv.Rows.Count; i++)
            {
                for (int c = 0; c < dgv.Columns.Count; c++)
                {
                    if (dgv.Columns[c].Visible == true)
                    {
                        for (int n = 0; n < dt.Columns.Count; n++)
                        {
                            if (dgv.Columns[c].HeaderText == dr.Table.Columns[n].ColumnName)
                            {
                                dr[n] = dgv.Rows[i].Cells[c].Value == null ? "" : dgv.Rows[i].Cells[c].Value.ToString();
                            }
                        }
                    }
                }
                dt.Rows.Add(dr.ItemArray);
            }
            return dt;
        }
        public void ExportExcel(string fileName, DataGridView dgv)
        {
            DataTable myDGV = GetDgvToTable(dgv);
            //string res = "";
            if (myDGV.Rows.Count > 0)
            {

                string saveFileName = "";
                //bool fileSaved = false;  
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xls";
                saveDialog.Filter = "Excel文件|*.xls";
                saveDialog.FileName = fileName;
                saveDialog.ShowDialog();
                saveFileName = saveDialog.FileName;
                if (saveFileName.IndexOf(":") < 0)
                {
                    return; //被点了取消   
                }

                frmWaitingBox f = new frmWaitingBox((obj, args) =>
                {
                    ExcelFile.SetData(myDGV, saveFileName, ExcelVersion.Excel8, HDRType.Yes);
                    MessageBox.Show("导出成功！");

                }, 100000, "请等待...", false, false);
                f.ShowDialog();
            }
        }
        /// <summary>
        /// datatable导出excel
        /// 2023-09-27 xulu 添加方法
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="dgv"></param>
        public void ExportExcel(string fileName, DataTable dgv)
        {
            if (dgv.Rows.Count > 0)
            {

                string saveFileName = "";
                //bool fileSaved = false;  
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xls";
                saveDialog.Filter = "Excel文件|*.xls";
                saveDialog.FileName = fileName;
                saveDialog.ShowDialog();
                saveFileName = saveDialog.FileName;
                if (saveFileName.IndexOf(":") < 0)
                {
                    return; //被点了取消   
                }

                frmWaitingBox f = new frmWaitingBox((obj, args) =>
                {
                    //数据源为空
                    if (dgv == null)
                    {
                        throw new Exception("无数据可导");
                    }
                    //保存路径为空
                    if (string.IsNullOrEmpty(saveFileName))
                    {
                        throw new Exception("未设置Excel保存路径");
                    }
                    //删除文件
                    if (File.Exists(saveFileName))
                    {
                        File.Delete(saveFileName);
                    }

                    DataTableToExcel(dgv, saveFileName);
                    MessageBox.Show("导出成功！");

                }, 100000, "请等待...", false, false);
                f.ShowDialog();
            }
        }

        /// <summary>
        /// datatable转excel(主要解决字段长度不够的报错问题)
        /// 2023-09-27 xulu 添加方法
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        private static bool DataTableToExcel(DataTable dt, string filePath)
        {
            try
            {
                string bufferLine = "";
                StreamWriter swObj = new StreamWriter(filePath, false, System.Text.Encoding.UTF8);
                string strLine="";
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    strLine = strLine + dt.Columns[i].Caption.ToString() + ",";      //写列标题
                }
                swObj.WriteLine(strLine);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    bufferLine = "";
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j > 0)
                        {
                            bufferLine += ",";
                        }
                        String handleStr = dt.Rows[i][j].ToString();

                        //特殊符号转义，回车、换行

                        if (dt.Rows[i][j].ToString().Contains("\r\n"))
                        {


                            handleStr = dt.Rows[i][j].ToString().Replace("\r\n", ";");
                        }

                        if (dt.Rows[i][j].ToString().Contains("\n") || dt.Rows[i][j].ToString().Contains("\r"))
                        {
                            handleStr = dt.Rows[i][j].ToString().Replace("\n", "").Replace("\r", "");
                        }

                        //特殊符号转义，逗号
                        if (dt.Rows[i][j].ToString().Contains(","))
                        {
                            //双引号             
                            if (dt.Rows[i][j].ToString().Contains("\""))
                            {
                                handleStr = dt.Rows[i][j].ToString().Replace("\"", "\"\"");
                            }
                            //逗号转义  
                            handleStr = "\"" + handleStr + "\"";
                        }
                        bufferLine += handleStr;
                    }
                    swObj.WriteLine(bufferLine);
                }
                swObj.Close();
                return true;
            }
            catch
            {
                return false;
            }
        }

    }
}