datagridview导出为excel文件的C#实例 急！

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Data;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;

namespace AssetsManage.Operation
{
class Export
{
private static System.Windows.Forms.DataGridView gridView;
private static System.Windows.Forms.ToolStripProgressBar toolStripProgressBar1;
private static Timer time;
private static DataSet objSet = new DataSet();
private static SaveFileDialog saveFileDialog = new SaveFileDialog();
private static SaveFileDialog saveFileDialog2 = new SaveFileDialog();

public static System.Windows.Forms.DataGridView _gridView
{
get { return gridView; }
set { gridView = value;}
}
public static System.Windows.Forms.ToolStripProgressBar _toolStripProgressBar1
{
get { return toolStripProgressBar1; }
set { toolStripProgressBar1 = value;}
}
public static Timer _time
{
get { return time; }
set { time = value;}
}
public static DataSet _objSet
{
get { return objSet; }
set { objSet.Clear(); objSet = value; }
}

//导出当前页DataGridView中的数据到EXcel中
public static void ExportTOExcel()
{
if (gridView.Rows.Count == 0)
{
MessageBox.Show("没有数据可供导出！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
saveFileDialog.FilterIndex = 0;
saveFileDialog.RestoreDirectory = true;
saveFileDialog.CreatePrompt = true;
saveFileDialog.Title = "导出文件保存路径";
saveFileDialog.ShowDialog();
string strName = saveFileDialog.FileName;
if (strName.Length != 0)
{
toolStripProgressBar1.Visible = true;
System.Reflection.Missing miss = System.Reflection.Missing.Value;
Microsoft.Office.Interop.Excel.ApplicationClass excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
excel.Application.Workbooks.Add(true); ;
excel.Visible = false;//若是true，则在导出的时候会显示EXcel界面。
if (excel == null)
{
MessageBox.Show("EXCEL无法启动！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
sheet.Name = "test";

//生成字段名称
for (int i = 0; i < gridView.ColumnCount; i++)
{
excel.Cells[1, i + 1] = gridView.Columns[i].HeaderText.ToString();
}
//填充数据
for (int i = 0; i < gridView.RowCount - 1; i++)
{
for (int j = 0; j < gridView.ColumnCount; j++)
{
if (gridView[j, i].Value == typeof(string))
{
excel.Cells[i + 2, j + 1] = "" + gridView[i, j].Value.ToString();
}
else
{
excel.Cells[i + 2, j + 1] = gridView[j, i].Value.ToString();
}
}
toolStripProgressBar1.Value += 100 / gridView.RowCount;
}
sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
book.Close(false, miss, miss);
books.Close();
excel.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
GC.Collect();
MessageBox.Show("数据已经成功导出到：" + saveFileDialog.FileName.ToString(), "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
toolStripProgressBar1.Value = 0;
toolStripProgressBar1.Visible = false;
}
}
}

//-------------------------------------------------------------------------------------------------------------------------------------
//导出整个DataGridView中的数据到Excel中
public static void ExportTOExcel2()
{
if (gridView.Rows.Count == 0)
{
MessageBox.Show("没有数据可供导出！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
saveFileDialog2.Filter = "Execl files (*.xls)|*.xls";
saveFileDialog2.FilterIndex = 0;
saveFileDialog2.RestoreDirectory = true;
//saveFileDialog2.CreatePrompt = true;
saveFileDialog2.Title = "导出文件保存路径";
saveFileDialog2.FileName = null;
saveFileDialog2.ShowDialog();
string FileName = saveFileDialog2.FileName;

if (FileName.Length != 0)
{
toolStripProgressBar1.Visible = true;
System.Data.DataTable dt = objSet.Tables[0];

FileStream objFileStream;
StreamWriter objStreamWriter;
string strLine = "";
objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);
objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
toolStripProgressBar1.Value = 0;

for (int i = 0; i < dt.Columns.Count; i++)
{
strLine = strLine + dt.Columns[i].ColumnName.ToString() + Convert.ToChar(9);

}
objStreamWriter.WriteLine(strLine);
strLine = "";

for (int i = 0; i < dt.Rows.Count; i++)
{
strLine = strLine + (i + 1) + Convert.ToChar(9);
for (int j = 1; j < dt.Columns.Count; j++)
{
strLine = strLine + dt.Rows[i][j].ToString() + Convert.ToChar(9);

}
objStreamWriter.WriteLine(strLine);
toolStripProgressBar1.Value += 100 / dt.Rows.Count;
strLine = "";
}
objStreamWriter.Close();
objFileStream.Close();
MessageBox.Show("数据已经成功导出到：" + saveFileDialog2.FileName.ToString(), "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
toolStripProgressBar1.Value = 0;
toolStripProgressBar1.Visible = false;
}
}
}

//————————————————————————————————————————————————————————————————————
//导出到XML(整个数据源)

public static void ExportTOXML()
{
if (gridView.Rows.Count == 0)
{
MessageBox.Show("没有数据可供导出！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
saveFileDialog2.Filter = "XML files (*.xml)|*.xml";
saveFileDialog2.FilterIndex = 0;
saveFileDialog2.RestoreDirectory = true;
//saveFileDialog2.CreatePrompt = true;
saveFileDialog2.Title = "导出文件保存路径";
saveFileDialog2.FileName = null;
saveFileDialog2.ShowDialog();
string FileName = saveFileDialog2.FileName;

if (FileName.Length != 0)
{
toolStripProgressBar1.Visible = true;
objSet.WriteXml(saveFileDialog2.FileName.ToString());
for (int i = 0; i < objSet.Tables[0].Rows.Count; i++)
{
toolStripProgressBar1.Value += 100 / objSet.Tables[0].Rows.Count;
}
MessageBox.Show("数据已经成功导出到：" + saveFileDialog2.FileName.ToString(), "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
toolStripProgressBar1.Value = 0;
toolStripProgressBar1.Visible = false;
}
}
}
}
}

以下是我项目中的一个类文件一部分，希望对你有所帮助：
-----------------------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Data;
using System.Data.OleDb;
using DevComponents.DotNetBar;

namespace U8Report
{
public static class DGVOutputer
{

public static void Output2Excel(DataGridView dgv, string filePath,string filename)
{
if (dgv.DataSource == null)
{
MessageBoxEx.Show("没有任何数据可以导出！", "上海凯汀妮软件有限公司",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}

StringBuilder sb;
string connString;
if (dgv.Rows.Count == 0)
{
MessageBoxEx.Show("没有任何数据可以导出！", "上海凯汀妮软件有限公司",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
sb = new StringBuilder();
connString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Extended Properties=Excel 8.0;" +
"data source=" + filePath;
//生成创建表的脚本
sb.Append("CREATE TABLE ");
sb.Append( "[" + filename + "] ( ");
for (int i = 0; i < dgv.Columns.Count; i++)
{

if (dgv.Columns[i].Visible == false) continue;
sb.Append(string.Format("{0} varchar,", "[" + dgv.Columns[i].HeaderText + "]"));
}

sb.Remove(sb.Length - 1, 1);
sb.Append(")");
using (OleDbConnection objConn = new OleDbConnection(connString))
{
OleDbCommand objCmd = new OleDbCommand();
objCmd.Connection = objConn;
objCmd.CommandText = sb.ToString();
try
{
objConn.Open();
objCmd.ExecuteNonQuery();
}
catch
{
return;
}

//插入脚本
sb.Remove(0, sb.Length);
sb.Append("INSERT INTO ");
sb.Append("[" + filename + "] ( ");
for (int i = 0; i < dgv.Columns.Count; i++)
{
if (dgv.Columns[i].Visible == false) continue;
sb.Append("[" + dgv.Columns[i].HeaderText + "],");
}
sb.Remove(sb.Length -1, 1);
sb.Append(") values (");

for (int i = 0; i < dgv.Columns.Count; i++)
{
if (dgv.Columns[i].Visible == false) continue;
sb.Append("@" + dgv.Columns[i].HeaderText + ",");
}
sb.Remove(sb.Length -1, 1);
sb.Append(")");

objCmd.CommandText = sb.ToString();
OleDbParameterCollection param = objCmd.Parameters;

for (int i = 0; i < dgv.Columns.Count; i++)
{
if (dgv.Columns[i].Visible == false) continue;
param.Add(new OleDbParameter("@" + dgv.Columns[i].HeaderText, OleDbType.VarChar));
}

foreach (DataGridViewRow row in dgv.Rows)
{

int j = 0;
for (int i = 0; i < dgv.Columns.Count; i++)
{
if (row.Cells[i].Visible == false) continue;
param[j].Value = row.Cells[i].Value;
j += 1;
}

objCmd.ExecuteNonQuery();
}
}
}

}
}

代码好全啊，做个记号，以后会需要到的