C#能不能像操作SQL数据库那样使用sql语句对excel进行读取更新等操作？

可以的话谁能给个简单的例子吗？
excel里面字段是怎么设，怎么读取的
还有excel里面由函数计算得出的数值在读取时会怎么样？

可以的 我这有个 操作excel 的例子 你可以参考下

这是一个完整的 excel 操作类 ，以前的一个项目用到的 DataSetToExcel

using System;
using System.Windows.Forms;
using System.Data;
using System.Collections;
using System.IO;
using System.Diagnostics;

namespace CHUmanager.MoonCake.Common
{
/// <summary>
/// DataSetToExcel 的摘要说明。
/// </summary>
public class DataSetToExcel
{
private DateTime beforeTime; //Excel启动之前时间
private DateTime afterTime; //Excel启动之后时间
public DataSetToExcel()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 导出到Excel
/// </summary>
/// <param name="filename">为要保存的excel文件名</param>
///<param name="GridX">要打开的DataGrid</param>
/// <param name="excelname">excelname为excel表的标题</param>
public bool ExportToExcel(string filename,DataGrid GridX,string excelname)
{
if(GridX==null) return false;

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 false; //被点了取消

beforeTime = DateTime.Now;//Excel启动之前时间
Excel.Application excel= new Excel.ApplicationClass(); //启动Excel进程
afterTime = DateTime.Now;//Excel启动之后时间
Excel._Workbook xBk = excel.Workbooks.Add(true);
Excel._Worksheet xSt = (Excel._Worksheet)xBk.ActiveSheet;
Excel.Range excelCell=null;
try
{
//赋值对象
object[] objarr;
DataTable dtTest=new DataTable();;
int i,j;
int iRows,iCows;
int iVisable;
iVisable=0;
iCows=0;
ArrayList list=new ArrayList();

//如果绑定数据源是DataTable和DataSet,取得行数
if (GridX.DataSource is System.Data.DataTable)
{
dtTest=(DataTable)GridX.DataSource;
iRows=dtTest.Rows.Count;
}
else if(GridX.DataSource is System.Data.DataSet)
{
DataSet ds=(DataSet)GridX.DataSource;
dtTest=ds.Tables[0];
iRows=dtTest.Rows.Count;
}
else if (GridX.DataSource is System.Data.DataView)
{
DataView dvTest=(DataView)GridX.DataSource;
iRows=dvTest.Count;
dtTest=dvTest.Table;
}
//如果是集合取得行数
else
{
System.Collections.CollectionBase ColTest;
ColTest=(System.Collections.CollectionBase)GridX.DataSource;
iRows=ColTest.Count;
}

//添加表头
xSt.Cells[1,1] = excelname;

//表头样式
excelCell=(Excel.Range)xSt.Cells[1,1];
excelCell.Interior.ColorIndex = 15;
excelCell.Font.Size = 14;
excelCell.Font.Name = "隶书";
excelCell.Font.Bold = true;
excelCell.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;

//如果有TableStyles则根据TableStyles取得(标题行)
if (GridX.TableStyles.Count>0)
{
list.Clear();
iCows=GridX.TableStyles[0].GridColumnStyles.Count;
for(i=0;i<iCows;i++)
{
if(GridX.TableStyles[0].GridColumnStyles[i].Width>0)
{
iVisable++;
list.Add(GridX.TableStyles[0].GridColumnStyles[i].HeaderText);
//获取字段样式
excelCell=(Excel.Range)xSt.Cells[2,i+1];
excelCell.Font.Bold = true;
}

}
objarr = new object[iVisable];
objarr=list.ToArray();
excelCell = xSt.get_Range(excel.Cells[2,1],excel.Cells[2,iVisable]);
excelCell.Value2 = objarr;
//数据行
for(i=0;i<iRows;i++)
{
objarr = new object[iVisable];
list.Clear();

for(j=0;j<iCows;j++)
{
if(GridX.TableStyles[0].GridColumnStyles[j].Width>0)
{
list.Add(GridX[i,j].ToString().Replace("\n",""));
}

}
if (list.Equals(System.DBNull.Value))
{
break;
}
objarr=list.ToArray();
excelCell = xSt.get_Range(excel.Cells[i+3,1],excel.Cells[i+3,iVisable]);
excelCell.Value2 = objarr;
}
}
else
{
iCows=dtTest.Columns.Count;
for(i=0;i<iCows;i++)
{
list.Add(dtTest.Columns[i].Caption.ToString());
}
objarr = new object[iCows];
objarr=list.ToArray();
excelCell = xSt.get_Range(excel.Cells[2,1],excel.Cells[2,iCows]);
excelCell.Value2 = objarr;

//数据行
for(i=0;i<iRows;i++)
{
objarr = new object[iCows];
list.Clear();

for(j=0;j<iCows;j++)
{
list.Add(GridX[i,j].ToString().Replace("\n",""));
}
if (list.Equals(System.DBNull.Value))
{
break;
}
objarr=list.ToArray();
excelCell = xSt.get_Range(excel.Cells[i+3,1],excel.Cells[i+3,iCows]);
excelCell.Value2 = objarr;
}

}

//合并单元格
Excel.Range rH = xSt.get_Range("A1",intToString(iCows)+"1");
rH.Merge(0);
dtTest.Dispose();

if(saveFileName!="")
{
try
{
xBk.Saved = true;
xBk.SaveCopyAs(saveFileName);
fileSaved=true;
}
catch(Exception ex)
{
fileSaved=false;
MessageBox.Show("导出文件时出错,文件可能正被打开！\n"+ex.Message);
}
}
else
{
fileSaved=false;
}
}
catch (System.Exception e)
{
System.Windows.Forms.MessageBox.Show(e.Message);
}
finally
{
excelCell=null;
xBk=null;
xSt=null;
excel=null;
GC.Collect();
KillExcelProcess();//强制结束Excel进程
}
return fileSaved;

}

/// <summary>
/// 导出到Excel
/// </summary>
/// <param name="filename">为要保存的excel文件名</param>
/// <param name="dt">dt为关联grid的DataTable</param>
/// <param name="excelname">excelname为excel表的标题</param>
public bool ExportToExcel(string filename,DataTable dt,string excelname)
{

if(dt==null) return false;

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 false; //被点了取消

beforeTime = DateTime.Now;//Excel启动之前时间
Excel.Application xlApp=new Excel.Application();
afterTime = DateTime.Now;//Excel启动之后时间

if(xlApp==null)
{
MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
return false;
}

Excel.Workbooks workbooks=xlApp.Workbooks;
Excel.Workbook workbook=workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
Excel.Worksheet worksheet=(Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
Excel.Range range;

long totalCount=dt.Rows.Count;
long rowRead=0;
float percent=0;

//合并单元格
Excel.Range rH = worksheet.get_Range("A1",intToString(dt.Columns.Count)+"1");
rH.Merge(0);
//写如标题
worksheet.Cells[1,1]=excelname;
//标题样式
range=(Excel.Range)worksheet.Cells[1,1];
range.Interior.ColorIndex = 15;
range.Font.Size = 14;
range.Font.Name = "隶书";
range.Font.Bold = true;
range.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
//写入字段
for(int i=0;i<dt.Columns.Count;i++)
{
worksheet.Cells[2,i+1]=dt.Columns[i].ColumnName;
//获取字段样式
range=(Excel.Range)worksheet.Cells[2,i+1];
range.Font.Bold = true;

}
//写入数值
for(int r=0;r<dt.Rows.Count;r++)
{
for(int i=0;i<dt.Columns.Count;i++)
{
worksheet.Cells[r+3,i+1]=dt.Rows[r][i];
}
rowRead++;
percent=((float)(100*rowRead))/totalCount;
System.Windows.Forms .Application.DoEvents();
}

range=worksheet.get_Range(worksheet.Cells[2,1],worksheet.Cells[dt.Rows.Count+2,dt.Columns.Count]);
range.BorderAround(Excel.XlLineStyle.xlContinuous,Excel.XlBorderWeight.xlThin,Excel.XlColorIndex.xlColorIndexAutomatic,null);

range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle =Excel.XlLineStyle.xlContinuous;
range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight =Excel.XlBorderWeight.xlThin;

if(dt.Columns.Count>1)
{
range.Borders[Excel.XlBordersIndex.xlInsideVertical].ColorIndex =Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Excel.XlBordersIndex.xlInsideVertical].LineStyle = Excel.XlLineStyle.xlContinuous;
range.Borders[Excel.XlBordersIndex.xlInsideVertical].Weight = Excel.XlBorderWeight.xlThin;
}

if(saveFileName!="")
{
try
{
workbook.Saved =true;
workbook.SaveCopyAs(saveFileName);
fileSaved=true;
}
catch(Exception ex)
{
fileSaved=false;
MessageBox.Show("导出文件时出错,文件可能正被打开！\n"+ex.Message);
}
}
else
{
fileSaved=false;
}
xlApp.Quit();
GC.Collect();//强行销毁,经测试这句话并没有结束Excel进程
KillExcelProcess();//强制结束进程
//用Excel打开文件
//if(fileSaved&&File.Exists(saveFileName))System.Diagnostics.Process.Start(saveFileName);
return fileSaved;
}
/// <summary>
/// 数字转字符。如：1转A 2转B
/// </summary>
/// <param name="num">要转换的数字,最大为26,最小为1</param>
/// <returns></returns>
private string intToString(int num)
{
if (num>26 || num<1)
{
return null;
}
string[] str = new string[26];
str[0] = "A";
str[1] = "B";
str[2] = "C";
str[3] = "D";
str[4] = "E";
str[5] = "F";
str[6] = "G";
str[7] = "H";
str[8] = "I";
str[9] = "J";
str[10] = "K";
str[11] = "L";
str[12] = "M";
str[13] = "N";
str[14] = "O";
str[15] = "P";
str[16] = "Q";
str[17] = "R";
str[18] = "S";
str[19] = "T";
str[20] = "U";
str[21] = "V";
str[22] = "W";
str[23] = "S";
str[24] = "Y";
str[25] = "Z";
return str[num-1];
}

/// <summary>
/// 结束Excel进程
/// </summary>
private void KillExcelProcess()
{
Process[] myProcesses;
DateTime startTime;
myProcesses = Process.GetProcessesByName("Excel");

//得不到Excel进程ID，暂时只能判断进程启动时间
foreach(Process myProcess in myProcesses)
{
startTime = myProcess.StartTime;

if(startTime > beforeTime && startTime < afterTime)
{
myProcess.Kill();
}
}
}
}
}

看完别忘记了加分啊！

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