ASP.NET读写Excel文件

　　在项目中经常需要用到读写Excel表格的功能，本文讲讲在ASP.NET中将数据导入到Excel表格中的基本方法。

1.读取Excel文件的数据连接字符串。读取.xls格式文件的Excel文件，可设置连接字符串为：Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\MyExcel.xls;Extended Properties=Excel 8.0;。如果要读取.xlsx和.xls格式文件的Excel文件，则需要将连接字符设置为："Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\MyExcel.xls;Extended Properties=Excel 12.0。

2.读取Excel表格Sheet的名称。

public static string[] GetExcelSheetNames(string filePath)
{
string conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0;HDR=YES\"";
OleDbConnection con = new OleDbConnection(conString);
con.Open();
DataTable dt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
con.Close();
if (dt == null)
{
return null;
}
string[] excelSheetNames = new string[dt.Rows.Count];
int i = 0;
foreach (DataRow dr in dt.Rows)
{
excelSheetNames[i++] = dr["TABLE_NAME"].ToString();
}
return excelSheetNames;
}

3.读取Excel文件。

public static DataTable ReadExcel(string filePath, string conStr)
{
string conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0;HDR=YES\"";
OleDbConnection con = new OleDbConnection(conString);
OleDbDataAdapter oda = new OleDbDataAdapter(conStr, con);
DataTable dt = new DataTable();
con.Open();
oda.Fill(dt);
con.Close();
return dt;
}

4.将数据写入Excel文件。

public static void WriteExcel(string filePath, DataTable dt)
{
if (File.Exists(filePath))
{
File.Delete(filePath);
}
else
{
string conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0;HDR=YES\"";
OleDbConnection con = new OleDbConnection(conString);
string createSql = "create table Sheet1 (";
foreach (DataColumn dc in dt.Columns)
{
createSql += dc.ColumnName + " varchar,";
}
createSql = createSql.Substring(0, createSql.Length - 1) + ")";

OleDbCommand cmd = new OleDbCommand(createSql, con);
con.Open();
cmd.ExecuteNonQuery();
foreach (DataRow dr in dt.Rows)
{
string insertSql = "insert into Sheet1 values(";
foreach (DataColumn dc in dt.Columns)
{
insertSql += "'" + dr[dc].ToString() + "',";
}
insertSql = insertSql.Substring(0, insertSql.Length - 1) + ")";
cmd = new OleDbCommand(insertSql, con);
cmd.ExecuteNonQuery();
}

con.Close();
}
}