C#如何对Excel文件进行读写?

Question

Excel文件是表结构的还是不规则的？

Answer 1

我给你写一段示例程序，参考这个写你自己的
myExcel.Application.Workbooks.Open(filename,missing,missing,missing,missing,
missing,missing,missing,missing,missing,missing,missing,missing); 
myExcel.Visible=false;
Excel.Worksheet worksheet=(Excel.Worksheet)myExcel.ActiveSheet;
string location=Server.MapPath("Data")+"\\testtext.txt";

FileStream OutStream=File.Create(location);
StreamWriter sw=new StreamWriter(OutStream);
string StringNum;
Session.Contents.Add("StringNum1","");
StringNum=worksheet.get_Range("c1","c1").Value2.ToString()+" ";
    StringNum+=worksheet.get_Range("c2","c2").Value2.ToString()+" ";
StringNum+=worksheet.get_Range("e1","e1").Value2.ToString()+" ";
StringNum+=worksheet.get_Range("e2","e2").Value2.ToString()+" ";
            myExcel.Application.Workbooks.Close();
worksheet=null;
myExcel.Application.Quit();
myExcel.Quit();
myExcel=null;
sw.WriteLine(StringNum);

sw.Flush();
sw.Close();

Answer 2

在执行之前先找到EXCEL.OLB文件把它放进CS目录中再用.NET的工具TLBIMP EXCEL.OLB这样会出现三个DLL文件,然后PROJECT->ADD REFERENCE 选择EXCEL.DLL和OFFICE.DLL再然后USING EXCEL.DLL USING OFFICE.DLL 最后在WEB.CONFIG中加入
<IDENTITY IMPERSONATE="TURE"/>

Answer 3

myExcel.Application.Workbooks.Open(filename,missing,missing,missing,missing,
missing,missing,missing,missing,missing,missing,missing,missing); 
myExcel.Visible=false;
Excel.Worksheet worksheet=(Excel.Worksheet)myExcel.ActiveSheet;
string location=Server.MapPath("Data")+"\\testtext.txt";

FileStream OutStream=File.Create(location);
StreamWriter sw=new StreamWriter(OutStream);
string StringNum;
Session.Contents.Add("StringNum1","");
StringNum=worksheet.get_Range("c1","c1").Value2.ToString()+" ";
    StringNum+=worksheet.get_Range("c2","c2").Value2.ToString()+" ";
StringNum+=worksheet.get_Range("e1","e1").Value2.ToString()+" ";
StringNum+=worksheet.get_Range("e2","e2").Value2.ToString()+" ";
            myExcel.Application.Workbooks.Close();
worksheet=null;
myExcel.Application.Quit();
myExcel.Quit();
myExcel=null;
sw.WriteLine(StringNum);

sw.Flush();
sw.Close();

Answer 4

如果是表结构的：
public static readonly string CONNECT_STRING = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=$datasource$;Extended Properties=Excel 8.0"; public static DataSet ExecuteSelectCommand(string cmdText,string conString, CommandType cmdType, params OleDbParameter[] cmdParms)
{
OleDbConnection conn = new OleDbConnection(conString);
OleDbCommand cmd = new OleDbCommand(cmdText,conn);
OleDbDataAdapter adpt = new OleDbDataAdapter(); cmd.CommandType = cmdType; if(null != cmdParms)
{
foreach(OleDbParameter para in cmdParms)
{
if(null == para.Value)
para.Value = DBNull.Value;
cmd.Parameters.Add(para);
}
} adpt.SelectCommand = cmd; try
{
DataSet dataSet = new DataSet();
adpt.Fill(dataSet);
return dataSet;
}
catch
{
throw;
}
finally
{
if (conn.State == ConnectionState.Open)
conn.Close();
}
}其中$datasource$是Excel文件的全路径名，sql查询语句（cmdText）中的表名就是sheet的名字，但是要这样写"SELECT * FROM [sheet1$]"，其中sheet1就是sheet的名字。
Excel2000生成的文件适用，Excel2003没有测试过。

Answer 5

引用Excel对象后，下面的代码可以执行：
using System;
using System.Data;
using System.Reflection;
static void Main(string[] args)
{
Excel.Application xApp=new Excel.ApplicationClass();
xApp.Visible=true;

Excel.Workbook xBook=xApp.Workbooks._Open(@"D:\Sample.xls",
Missing.Value,Missing.Value,Missing.Value,Missing.Value
,Missing.Value,Missing.Value,Missing.Value,Missing.Value
,Missing.Value,Missing.Value,Missing.Value,Missing.Value);
//xBook=xApp.Workbooks.Add(Missing.Value);
Excel.Worksheet xSheet=(Excel.Worksheet)xBook.Sheets[1];
//Excel.Worksheet xSheet=(Excel.Worksheet)xApp.ActiveSheet;

Excel.Range rng1=xSheet.get_Range("A1",Type.Missing);
Console.WriteLine(rng1.Value2);

Excel.Range rng2=(Excel.Range)xSheet.Cells[3,1];
Console.WriteLine(rng2.Value2);
Excel.Range rng3=xSheet.get_Range("C6",Missing.Value);
rng3.Value2="Hello";
rng3.Interior.ColorIndex=6; //xBook.SaveAs(@"D:\CData.xls",Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value //,Excel.XlSaveAsAccessMode.xlNoChange,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value);
xBook.Save(); xSheet=null;
//xBook.Close(Missing.Value,Missing.Value,Missing.Value);
xBook=null;
xApp.Quit();
xApp=null;
}

Answer 6

http://msdn.microsoft.com/library/en-us/odc_vsto2003_ta/html/ExcelObj.asp?frame=true

Answer 7

读写都没问题了.但字段中有个指.要求读到小数点后三位.比如1.000,但用rng2.Value2好像就变成1了.帮忙啊