使用 OleDbCommand / OleDbDataAdapter 读取 CSV 文件

我不明白为什么，但是当我使用 OleDbDataAdapter 或 OleDbCommand 读取 CSV 文件时，在这两种情况下，生成的数据结构良好（它识别文件头中的列），但行数据都是空字符串。

我之前已经成功进行过多次 CSV 处理，因此我发现此文件的唯一区别是文件中的所有字段都用引号引起来。
我尝试过使用 schema.ini 文件，但无济于事。这感觉像是 Microsoft Jet 4.0 组件的问题，但我无法弄清楚问题是什么。

以下是该文件的摘录：

"UNIQUEID","OWNERID","PHONE1","PHONE2","EMERGENCYCONTACT","ADDRESS1","ADDRESS2","ADDRESS3","ADDRESSCITY","ADDRESSSTATE","ADDRESSZIP","UNIONCODE","CUSTOM1","CUSTOM2","CUSTOM3","CUSTOM4","CUSTOM5","CUSTOM6"
"5","33","1235551212","          ","","1914 SANDFLAT ROAD","","","THOMASVILLE","AL","367849215","","contract","7.75","1","N","","A"
"6","34","1235551212","          ","","1407 OLD HWY. 5 SOUTH","","","THOMASVILLE","AL","36784","","contract","7.75","1","N","","B"
"7","35","1235551212","          ","","P.O. BOX 204","","","THOMASVILLE","AL","36784","","substitute","7.75","0","Y","","M"
"8","36","1235551212","          ","","383 UNCLE BEN RD","","","THOMASVILLE","AL","36784","","substitute","0.00","0","","",""

这是我当前的代码：

OleDbConnection conn = new OleDbConnection(
    "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\payroll;" + 
    "Extended Properties=\"text;HDR=Yes;FMT=CSVDelimited\"");
OleDbDataAdapter adapter = new OleDbDataAdapter("select * from file.txt", conn);
DataTable dt = new DataTable();
adapter.Fill(dt);

以下是 schema.ini 文件的内容。没有它我无法读取该文件：

[file.txt]
Format=CSVDelimited
ColNameHeader=True
Col1="UNIQUEID" Text
Col2="OWNERID" Text
Col3="PHONE1" Text
Col4="PHONE2" Text
Col5="EMERGENCYCONTACT" Text
Col6="ADDRESS1" Text
Col7="ADDRESS2" Text
Col8="ADDRESS3" Text
Col9="ADDRESSCITY" Text
Col10="ADDRESSSTATE" Text
Col11="ADDRESSZIP" Text
Col12="UNIONCODE" Text
Col13="CUSTOM1" Text
Col14="CUSTOM2" Text
Col15="CUSTOM3" Text
Col16="CUSTOM4" Text
Col17="CUSTOM5" Text
Col18="CUSTOM6" Text
CharacterSet=ANSI

我发现问题是什么了。 schema.ini 文件中的字符集设置为 ANSI。文件编码是Unicode。将字符集设置为 Unicode 解决了该问题。