1.方法一:采用OleDB读取EXCEL文件:
把EXCEL文件当做一个数据源来进行数据的读取操作,实例如下:
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public DataSet
ExcelToDS( string Path)
{
string strConn
= "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data
Source=" +
Path + ";" + "Extended
Properties=Excel 8.0;" ;
OleDbConnection
conn = new OleDbConnection(strConn);
conn.Open();
string strExcel
= "" ;
OleDbDataAdapter
myCommand = null ;
DataSet
ds = null ;
strExcel= "select
* from [sheet1$]" ;
myCommand
= new OleDbDataAdapter(strExcel,
strConn); ds
= new DataSet();
myCommand.Fill(ds, "table1" );
return ds;
} |
对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到
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string strConn
= "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data
Source=" +
Path + ";" + "Extended
Properties=Excel 8.0;" ;
OleDbConnection
conn = new OleDbConnection(strConn);
DataTable
schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null );
string tableName=schemaTable.Rows[0][2].ToString().Trim();
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另外:也可进行写入EXCEL文件,实例如下:
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public void DSToExcel( string Path,DataSet
oldds) {
//先得到汇总EXCEL的DataSet
主要目的是获得EXCEL在DataSet中的结构 string strCon
= "
Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" +path1+ ";Extended
Properties=Excel 8.0" ;
OleDbConnection
myConn = new OleDbConnection(strCon)
; string strCom= "select
* from [Sheet1$]" ;
myConn.Open
( ) ; OleDbDataAdapter
myCommand = new OleDbDataAdapter
( strCom, myConn ) ; ystem.Data.OleDb.OleDbCommandBuilder
builder= new OleDbCommandBuilder(myCommand);
//QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。
builder.QuotePrefix= "[" ;
//获取insert语句中保留字符(起始位置)
builder.QuoteSuffix= "]" ;
//获取insert语句中保留字符(结束位置)
DataSet
newds= new DataSet();
myCommand.Fill(newds
, "Table1" )
; for ( int i=0;i<oldds.Tables[0].Rows.Count;i++)
{
//在这里不能使用ImportRow方法将一行导入到news中,因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。 在使用ImportRow后newds内有值,但不能更新到Excel中因为所有导入行的DataRowState!=Added
DataRow
nrow=aDataSet.Tables[ "Table1" ].NewRow();
for ( int j=0;j<newds.Tables[0].Columns.Count;j++)
{
nrow[j]=oldds.Tables[0].Rows[i][j];
}
newds.Tables[ "Table1" ].Rows.Add(nrow);
}
myCommand.Update(newds, "Table1" );
myConn.Close();
}
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2.方法二:引用的com组件:Microsoft.Office.Interop.Excel.dll 读取EXCEL文件
首先是Excel.dll的获取,将Office安装目录下的Excel.exe文件Copy到DotNet的bin目录下,cmd到该目录下,运行 TlbImp EXCEL.EXE Excel.dll 得到Dll文件。 再在项目中添加引用该dll文件.
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//读取EXCEL的方法
(用范围区域读取数据) private void OpenExcel( string strFileName) { object missing
= System.Reflection.Missing.Value; Application
excel = new Application(); //lauch
excel application if (excel
== null ) { Response.Write( "<script>alert('Can't
access excel')</script>" ); } else { excel.Visible
= false ;
excel.UserControl = true ; //
以只读的形式打开EXCEL文件 Workbook
wb = excel.Application.Workbooks.Open(strFileName, missing, true ,
missing, missing, missing, missing,
missing, missing, true ,
missing, missing, missing, missing, missing); //取得第一个工作薄 Worksheet
ws = (Worksheet)wb.Worksheets.get_Item(1); //取得总记录行数
(包括标题列) int rowsint
= ws.UsedRange.Cells.Rows.Count; //得到行数 //int
columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列数 //取得数据范围区域
(不包括标题列) Range
rng1 = ws.Cells.get_Range( "B2" ,
"B" +
rowsint); //item Range
rng2 = ws.Cells.get_Range( "K2" ,
"K" +
rowsint); //Customer object [,]
arryItem= ( object [,])rng1.Value2;
//get
range's value object [,]
arryCus = ( object [,])rng2.Value2;
//将新值赋给一个数组 string [,]
arry = new string [rowsint-1,
2]; for ( int i
= 1; i <= rowsint-1; i++) { //Item_Code列 arry[i
- 1, 0] =arryItem[i, 1].ToString(); //Customer_Name列 arry[i
- 1, 1] = arryCus[i, 1].ToString(); } Response.Write(arry[0,
0] + "
/ " +
arry[0, 1] + "#" +
arry[rowsint - 2, 0] + "
/ " +
arry[rowsint - 2, 1]); } excel.Quit();
excel = null ; Process[]
procs = Process.GetProcessesByName( "excel" ); foreach (Process
pro in procs) { pro.Kill(); //没有更好的方法,只有杀掉进程 } GC.Collect(); } |
3.方法三:将EXCEL文件转化成CSV(逗号分隔)的文件,用文件流读取(等价就是读取一个txt文本文件)。
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先引用命名空间: using System.Text;和 using System.IO; FileStream
fs = new FileStream( "d:\\Customer.csv" ,
FileMode.Open, FileAccess.Read, FileShare.None); StreamReader
sr = new StreamReader(fs,
System.Text.Encoding.GetEncoding(936)); string str
= "" ; string s
= Console.ReadLine(); while (str
!= null ) {
str = sr.ReadLine(); string []
xu = new String[2]; xu
= str.Split( ',' ); string ser
= xu[0]; string dse
= xu[1]; if (ser
== s) {
Console.WriteLine(dse); break ; } }
sr.Close(); |
另外也可以将数据库数据导入到一个txt文件,实例如下:
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//txt文件名 string fn
= DateTime.Now.ToString( "yyyyMMddHHmmss" )
+ "-" +
"PO014" +
".txt" ; OleDbConnection
con = new OleDbConnection(conStr);
con.Open(); string sql
= "select
ITEM,REQD_DATE,QTY,PUR_FLG,PO_NUM from TSD_PO014" ;
//OleDbCommand
mycom = new OleDbCommand("select * from TSD_PO014", mycon); //OleDbDataReader
myreader = mycom.ExecuteReader(); //也可以用Reader读取数据 DataSet
ds = new DataSet(); OleDbDataAdapter
oda = new OleDbDataAdapter(sql,
con); oda.Fill(ds,
"PO014" ); DataTable
dt = ds.Tables[0]; FileStream
fs = new FileStream(Server.MapPath( "download/" +
fn), FileMode.Create, FileAccess.ReadWrite); StreamWriter
strmWriter = new StreamWriter(fs);
//存入到文本文件中
//把标题写入.txt文件中
//for
(int i = 0; i <dt.Columns.Count;i++) //{ //
strmWriter.Write(dt.Columns[i].ColumnName + " "); //} foreach (DataRow
dr in dt.Rows) { string str0,
str1, str2, str3; string str
= "|" ;
//数据用"|"分隔开 str0
= dr[0].ToString(); str1
= dr[1].ToString(); str2
= dr[2].ToString(); str3
= dr[3].ToString(); str4
= dr[4].ToString().Trim(); strmWriter.Write(str0); strmWriter.Write(str); strmWriter.Write(str1); strmWriter.Write(str); strmWriter.Write(str2); strmWriter.Write(str); strmWriter.Write(str3); strmWriter.WriteLine();
//换行 } strmWriter.Flush(); strmWriter.Close(); if (con.State
== ConnectionState.Open) { con.Close(); } |