C# DataGridView导出Excel的两种经典方法

第一种是用数据流导出:

#region            SaveFileDialog saveFileDialog = new SaveFileDialog();            saveFileDialog.Filter = "Execl files (*.xls)|*.xls";            saveFileDialog.FilterIndex = 0;            saveFileDialog.RestoreDirectory = true;            saveFileDialog.CreatePrompt = true;            saveFileDialog.Title = "Export Excel File";            saveFileDialog.ShowDialog();            if (saveFileDialog.FileName == "")                return;            Stream myStream;            myStream = saveFileDialog.OpenFile();            StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));            string str = "";            try            {                for (int i = 0; i < dataGridView1.ColumnCount; i++)                {                    if (i > 0)                    {                        str += "\t";                    }                    str += dataGridView1.Columns[i].HeaderText;                }                sw.WriteLine(str);                for (int j = 0; j < dataGridView1.Rows.Count; j++)                {                    string tempStr = "";                    for (int k = 0; k < dataGridView1.Columns.Count; k++)                    {                        if (k > 0)                        {                            tempStr += "\t";                        }                        tempStr += dataGridView1.Rows[j].Cells[k].Value.ToString();                    }                    sw.WriteLine(tempStr);                }                sw.Close();                myStream.Close();            }            catch (Exception ex)            {                //MessageBox.Show(ex.ToString());            }            finally            {                sw.Close();                myStream.Close();            }#endregion

这种方法的优点就是导出比较快，但是excel的表格里面设置标题，字体样式等都不能弄，因为你是用数据流直接导出为excel的，除非你能在数据流中设置这些样式，这个我还没这本事，哪位大哥会的教一下...嘿嘿

第二种方法是直接写一个类，这个类直接操作EXCEL的：

using System;using System.Collections.Generic;using System.Windows.Forms;using System.Text;using System.Diagnostics;using System.IO;using Microsoft.Office.Interop.Excel;namespace Excel{    public class Export    {        /// <summary>        /// DataGridView导出Excel        /// </summary>        /// <param name="strCaption">Excel文件中的标题</param>        /// <param name="myDGV">DataGridView 控件</param>        /// <returns>0:成功;1:DataGridView中无记录;2:Excel无法启动;9999:异常错误</returns>        public int ExportExcel(string strCaption, DataGridView myDGV, SaveFileDialog saveFileDialog)        {            int result = 9999;                        //保存                        saveFileDialog.Filter = "Execl files (*.xls)|*.xls";            saveFileDialog.FilterIndex = 0;            saveFileDialog.RestoreDirectory = true;            //saveFileDialog.CreatePrompt = true;            saveFileDialog.Title = "Export Excel File";            if ( saveFileDialog.ShowDialog()== DialogResult.OK)            {                if (saveFileDialog.FileName == "")                {                    MessageBox.Show("请输入保存文件名！");                    saveFileDialog.ShowDialog();                }                    // 列索引，行索引，总列数，总行数                int ColIndex = 0;                int RowIndex = 0;                int ColCount = myDGV.ColumnCount;                int RowCount = myDGV.RowCount;                if (myDGV.RowCount == 0)                {                    result = 1;                }                // 创建Excel对象                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();                if (xlApp == null)                {                    result = 2;                }                try                {                    // 创建Excel工作薄                    Microsoft.Office.Interop.Excel.Workbook xlBook = xlApp.Workbooks.Add(true);                    Microsoft.Office.Interop.Excel.Worksheet xlSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.Worksheets[1];                    // 设置标题                    Microsoft.Office.Interop.Excel.Range range = xlSheet.get_Range(xlApp.Cells[1, 1], xlApp.Cells[1, ColCount]); //标题所占的单元格数与DataGridView中的列数相同                    range.MergeCells = true;                    xlApp.ActiveCell.FormulaR1C1 = strCaption;                    xlApp.ActiveCell.Font.Size = 20;                    xlApp.ActiveCell.Font.Bold = true;                    xlApp.ActiveCell.HorizontalAlignment = Microsoft.Office.Interop.Excel.Constants.xlCenter;                    // 创建缓存数据                    object[,] objData = new object[RowCount + 1, ColCount];                    //获取列标题                    foreach (DataGridViewColumn col in myDGV.Columns)                    {                        objData[RowIndex, ColIndex++] = col.HeaderText;                    }                    // 获取数据                    for (RowIndex = 1; RowIndex < RowCount; RowIndex++)                    {                        for (ColIndex = 0; ColIndex < ColCount; ColIndex++)                        {                            if (myDGV[ColIndex, RowIndex - 1].ValueType == typeof(string)                                || myDGV[ColIndex, RowIndex - 1].ValueType == typeof(DateTime))//这里就是验证DataGridView单元格中的类型,如果是string或是DataTime类型,则在放入缓存时在该内容前加入" ";                            {                                objData[RowIndex, ColIndex] = "" + myDGV[ColIndex, RowIndex - 1].Value;                            }                            else                            {                                objData[RowIndex, ColIndex] = myDGV[ColIndex, RowIndex - 1].Value;                            }                        }                        System.Windows.Forms.Application.DoEvents();                    }                    // 写入Excel                    range = xlSheet.get_Range(xlApp.Cells[2, 1], xlApp.Cells[RowCount, ColCount]);                    range.Value2 = objData;                    xlBook.Saved = true;                    xlBook.SaveCopyAs(saveFileDialog.FileName);                }                catch (Exception err)                {                    result = 9999;                }                finally                {                    xlApp.Quit();                    GC.Collect(); //强制回收                }                //返回值                result = 0;            }                        return result;        }    }}

这个优点是能设置样式什么的。缺点就是导出速度慢...

以上两种方法都是参考了很多料的..写在这里以便于相互学习..

补充一下：用第二种方法导出excel会有格式方面的变化，比如身份证号码按科学计算法导出了，不是按原先的模型

改进方法是在写入excel时添加一个格式声明：range.NumberFormatLocal = "@";

如：// 写入Excel

range = xlSheet.get_Range(xlApp.Cells[2, 1], xlApp.Cells[RowCount + 2, ColCount]);range.NumberFormatLocal = "@";range.Value2 = objData;