阅读csv有双重报价与lumenwork csv读者 [英] Reading csv having double quotes with lumenwork csv reader

问题描述

我正在使用Lumenworks csv阅读器读取csv文件。以下是示例记录

I'm reading a csv file using the Lumenworks csv reader. Below is an example record

"001-0000265-003"|"Some detail"|"detal1"|"detail2"|"detal3"|"detail4"|"detail5"|"detail6"

用下面的构造函数读取这个文件

I've created a class with below constructor to read this file

using (var input = new CsvReader(stream, true, '|'))
{
//logic to create an xml here
}

工作正常，当没有双引号里面的细节。但是当这样的情况下

This works fine when there is no double quotes inside details. But when the scinarios like this

"001-0000265-003"|"Some " detail"|"detal1"|"detail2"|"detal3"|"detail4"|"detail5"|"detail6"

异常

An unhandled exception of type 'LumenWorks.Framework.IO.Csv.MalformedCsvException' occurred in LumenWorks.Framework.IO.dll

所以我使用了CsvReader构造函数，它接受了7个参数，

So then I used the CsvReader constructor which takes 7 arguments,

CsvReader(stream, true, '|', '"', '"', '#', LumenWorks.Framework.IO.Csv.ValueTrimmingOptions.All))

但我仍然收到同样的错误，请提供任何建议。

But still I'm getting the same error. Please provide any suggestions.

我正在阅读一些复杂的申请，如下：

I'm reading some complex filed as follows,

"001-0000265-003"|"ABC 33"X23" CDE 32'X33" AAA, BB'C"|"detal1"|"detail2"|"detal3"|"detail4"|"detail5"|"detail6"

推荐答案

我已经测试了你的示例数据，很难修复这个格式错误的行fe从 Catch -block）。所以我不会使用引号字符，而只是使用管道分隔符，并通过 csv [i] .Trim（）删除 '''）。

I've tested it with your sample data and it's pretty difficult to fix this malformed line(f.e. from the Catch-block). So i would not use a quoting-character, but instead just use the pipe-delimiter and remove the " later via csv[i].Trim('"').

以下是解析文件并返回所有行的字段的方法：

Here's a method that parses the file and returns all lines' fields:

private static List<List<string>> GetAllLineFields(string fullPath)
{
    List<List<string>> allLineFields = new List<List<string>>();
    var fileInfo = new System.IO.FileInfo(fullPath);

    using (var reader = new System.IO.StreamReader(fileInfo.FullName, Encoding.Default))
    {
        Char quotingCharacter = '\0'; // no quoting-character;
        Char escapeCharacter = quotingCharacter;
        Char delimiter = '|';
        using (var csv = new CsvReader(reader, true, delimiter, quotingCharacter, escapeCharacter, '\0', ValueTrimmingOptions.All))
        {
            csv.DefaultParseErrorAction = ParseErrorAction.ThrowException;
            //csv.ParseError += csv_ParseError;  // if you want to handle it somewhere else
            csv.SkipEmptyLines = true;

            while (csv.ReadNextRecord())
            {
                List<string> fields = new List<string>(csv.FieldCount);
                for (int i = 0; i < csv.FieldCount; i++)
                {
                    try
                    {
                        string field = csv[i];
                        fields.Add(field.Trim('"'));
                    } catch (MalformedCsvException ex)
                    {
                        // log, should not be possible anymore
                        throw;
                    }
                }
                allLineFields.Add(fields);
            }
        }
    }
    return allLineFields;
}

使用包含样本数据的文件进行测试和输出：

Test and output with a file that contains your sample data:

List<List<string>> allLineFields = GetAllLineFields(@"C:\Temp\Test\CsvFile.csv");
    foreach (List<string> lineFields in allLineFields)
        Console.WriteLine(string.Join(",", lineFields.Select(s => string.Format("[{0}]", s))));

[001-0000265-003],[Some detail],[detal1],[detail2],[detal3],[detail4],[detail5],[detail6]
[001-0000265-003],[Some " detail],[detal1],[detail2],[detal3],[detail4],[detail5],[detail6]

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