c# 读取 csv 文件给出的路径无效

Question

我似乎无法使用以下连接字符串读取 .csv 文件:

var fileName = string.Format("{0}{1}", AppDomain.CurrentDomain.BaseDirectory, "Uploads\\countrylist.csv");
string connectionString = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}; Extended Properties=""text;HDR=YES;FMT=Delimited""", fileName);
OleDbConnection oledbConn = new OleDbConnection(connectionString);
oledbConn.Open();

它给出了以下错误:

'D:\arrgh\arrgh\Uploads\countrylist.csv' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.

我确认文件在那里。这里发生了什么？

Answer 1

好吧，我进一步挖掘了一下，似乎我的连接字符串是错误的。对于 CSV 文件，您无需指定实际文件名，而是指定它所属的目录，例如。

var fileName = string.Format("{0}{1}", AppDomain.CurrentDomain.BaseDirectory, "Uploads\\");
string connectionString = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}; Extended Properties=""text;HDR=YES;FMT=Delimited""", fileName);
OleDbConnection oledbConn = new OleDbConnection(connectionString);
oledbConn.Open();
var cmd = new OleDbCommand("SELECT * FROM [countrylist.csv]", oledbConn);

然后您在 SelectCommand 中指定文件名。多么奇怪的做事方式。它现在对我有用。