使用OLEDB方式 读取excel和csv文件

/// <summary>
/// 使用OLEDB读取excel和csv文件
/// </summary>
/// <param name="path">文件所在目录地址</param>
/// <param name="name">文件名</param>
/// <returns></returns>
public static DataSet ReadFile(string path, string name)
{
if (string.IsNullOrWhiteSpace(path) || string.IsNullOrWhiteSpace(name) || !File.Exists(path+name))
return null;
// 读取excel
string connstring = string.Empty;
string strSql = string.Empty;
if (name.EndsWith(".xls") || name.EndsWith(".xlsx"))
{
connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + name + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1';";
strSql = "select * from [sheet1$]";
}
// 读取csv文件
else if (name.EndsWith(".csv"))
{
connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties='text;HDR=YES;FMT=Delimited';";
strSql = "select * from " + name;
}
else
{
return null;
}
DataSet ds = null;
OleDbConnection conn = null;
try
{
conn = new OleDbConnection(connstring);
conn.Open();
OleDbDataAdapter myCommand = null;

myCommand = new OleDbDataAdapter(strSql, connstring);
ds = new DataSet();
myCommand.Fill(ds, "table1");
}
catch (Exception e)
{
throw e;
}
finally
{
conn.Close();
}
return ds;
}