TextFieldParser throws a MalformedLineException on a (seemingly) well-formed CSV line (error text doesn't seem to apply)

问题

I have some pretty typical code to parse a CSV file using a Microsoft.VisualBasic.FileIO.TextFieldParser:

using (TextFieldParser parser = new TextFieldParser(new StringReader(jobsReport)))
{
    parser.SetDelimiters(",");
    parser.HasFieldsEnclosedInQuotes = true;

    string[] headers = parser.ReadFields();

    while (!parser.EndOfData)
    {
        // ERROR OCCURS HERE
        string[] fields = parser.ReadFields();
        // ...
    }
}

However, I get the following exception:

Microsoft.VisualBasic.FileIO.MalformedLineException: Line 195 cannot be parsed using the current Delimiters.

Line 195 (according to Notepad++) is as follows:

0,0,0,0,0,0,0,2017-01-03T00:00:00,,"72d7a7e9-8700-4014-916c-a85e9a6b1ac5",1,REF212U,CREATED,"Evan job for ""Publish Bug""",Changzhou,China,31.77359,119.95401,Jiangsu

If I manually get rid of the double quotes and make the line this:

0,0,0,0,0,0,0,2017-01-03T00:00:00,,"72d7a7e9-8700-4014-916c-a85e9a6b1ac5",1,REF212U,CREATED,"Evan job for Publish Bug",Changzhou,China,31.77359,119.95401,Jiangsu

it works perfectly. According to this Q&A, this is the correct way to escape double quotes.

Also, Excel does just fine with this file:

This is exactly how I'd expect this to be handled.

Microsoft has a document that describes the error as follows: "The specified line cannot be parsed because it uses delimiters other than those specified." It then rather unhelpfully suggests that I change the following to fix it: "Adjust Delimiters so the line can be parsed correctly, or insert exception-handling code in order to handle the line."

I don't understand how this applies, though - that doesn't appear to be the problem in this case.

My questions, then: why does the parser crash on this line, even though the escaping appears to be correct? And why this particular error message? And, of course, most importantly: how do I fix this?

Edit: Here are a few more of the surrounding lines:

"RBCD","0","0","0","1","0","4","0","2017-01-02T00:00:00","","f233e70a-293d-4953-b96d-79eb29261ea7","1","REF211I","OFFER","Planning Engineer","Wuxi","China"
"AFCO","0","0","0","0","0","0","0","2017-01-03T00:00:00","","15b6eda6-ce71-426d-8530-49c9044b3d62","0","REF214Q","CREATED","Technical Consultant","Shanghai","China"
"RBUS","0","0","0","0","0","0","0","2017-01-03T00:00:00","","a8f3930f-897c-4e4d-8b52-9029efdb9c65","0","REF215E","CREATED","Sr. Calibration Engineer","Farmington Hills","United States"
"PTCN","0","0","0","0","0","0","0","2017-01-03T00:00:00","","72d7a7e9-8700-4014-916c-a85e9a6b1ac5","1","REF212U","CREATED","Evan job for ""Publish Bug""","Changzhou","China"
"RBAC","0","0","0","0","0","0","0","2017-01-03T00:00:00","","fd643834-bafd-4674-aad9-4fe5cb0271cd","0","REF213F","CREATED","Test_Technical Consultant","Suzhou","China"
"RBCN","0","0","0","0","0","1","0","2017-01-04T00:00:00","","0c450e80-f64e-429d-9d85-3fd09a806d1f","1","REF218R","SOURCING","Test Job Role approver","Shanghai","China"
"","0","0","0","1","0","3","0","2017-01-04T00:00:00","","c952f49c-db78-4a86-8ad5-797e1b7f6933","1","REF217C","OFFER","quality engineer-SQE","Shanghai","China"

回答1:

Afraid TextFileParser can handle this situation. You might have better luck with an oledb connection and reading it with a datareader. Or use other open source CSV parsers.

The one I can recommend is Cinchoo ETL

using (var p = new ChoCSVReader("QuoteInQuote.csv"))
{
    foreach (dynamic rec in p)
        Console.WriteLine(rec.DumpAsJson());
}

Output:

{
  "Column1": 0,
  "Column2": 0,
  "Column3": 0,
  "Column4": 0,
  "Column5": 0,
  "Column6": 0,
  "Column7": 0,
  "Column8": "2017-01-03T00:00:00",
  "Column9": null,
  "Column10": "72d7a7e9-8700-4014-916c-a85e9a6b1ac5",
  "Column11": 1,
  "Column12": "REF212U",
  "Column13": "CREATED",
  "Column14": "Evan job for \"Publish Bug\"", <-- Correct value
  "Column15": "Changzhou",
  "Column16": "China",
  "Column17": 31.77359,
  "Column18": 119.95401,
  "Column19": "Jiangsu"
}

来源：https://stackoverflow.com/questions/48388803/textfieldparser-throws-a-malformedlineexception-on-a-seemingly-well-formed-csv

标签

vb.net

csv