C# 中的 TextFieldParser 问题

Question

我在 Windows 7 Enterprise 上使用 Visual Studio 2013、.NET 4.5.2、OpenXml 2.5。我创建了一段代码，将两个 .csv 文件导入到一对通用列表中，并比较它们的异常情况。当我去构建一个通用的 class 来加载 .csv 文件时，TextFieldParser 将无法工作。它适用于 Main()，但不适用于 class.

虽然我怀疑答案与 "using alias within a namespace" 有关，但它在 Main() 中完美运行。 Microsoft 有一个免责声明，即 rhs 不能是泛型类型，但如果它在一个地方有效，为什么另一个地方不行？

这是预期的行为还是有已知的解决方法？

背景：TextFieldParser 是一个 VB.NET class，可以巧妙地处理 .csv 或固定字段文件的解析。通用列表或 List 是可以处理其中任何内容的列表 classes。在我的例子中，我使用记录 class 作为包含的对象。 OpenXml 是一项 Microsoft 技术，用于与 Office 产品一起处理 XML 配置文件或连接字符串。我将导入配置设置以使 classes 使用通用。它正在尝试为我遇到问题的 TextFieldParser 构建通用 class 。 Google 已经让我走了这么远，但没有更远。

Main()中的工作代码：

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualBasic.FileIO;
using ExportToExcel;

    public static void Main(string[] args)
    {
        // HARD_CODED FOR EXAMPLE ONLY - TO BE RETRIEVED FROM APP.CONFIG IN REAL PROGRAM
        string hospPath = @"C:\events\inbound\OBLEN_COB_Active_Inv_Advi_Daily_.csv";
        string vendPath = @"C:\events\outbound\Advi_OBlen_Active_Inv_Ack_Daily_.csv";

        List<DenialRecord> hospList = new List<DenialRecord>();
        List<DenialRecord> vendList = new List<DenialRecord>();

        using (TextFieldParser hospParser = new Microsoft.VisualBasic.FileIO.TextFieldParser(hospPath))
        {
            hospParser.TextFieldType = FieldType.Delimited;
            hospParser.SetDelimiters(",");
            hospParser.HasFieldsEnclosedInQuotes = false;
            hospParser.TrimWhiteSpace = true;

            while (!hospParser.EndOfData)
            {

                try
                {
                    string[] row = hospParser.ReadFields();
                    if (row.Length <= 7)
                    {
                        DenialRecord dr = new DenialRecord(row[0], row[1], row[2], row[3], row[4], row[5], row[6]);
                        hospList.Add(dr);
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("Error is:  {0}", e.ToString());
                }
            }
            hospParser.Close();
            hospParser.Dispose();
        }

class 中的非工作代码本身：

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualBasic.FileIO;
using ExportToExcel;

namespace InputSide
{
internal class CsvLoader
{
    private int columnCount = 7;    // backing store
    private string filePath;
    private List<DenialRecord> inputList = new List<DenialRecord>();

    public List<DenialRecord> InputList
    {
        set
        {
            this.inputList = InputList;
        }
        get
        {
            return inputList;
        }
    }

    // Default constructor
    internal CsvLoader()
    {
    }

    // Exposed constructor
    public CsvLoader(List<DenialRecord> InputList,  string FilePath, int ColumnCount)
    {
        this.inputList = InputList;
        this.filePath = FilePath;
    }

    // Load csv to List<T>
    public List<DenialRecord> CsvList(int columnCount)
    {
        private int columnCount;

        using (TextFieldParser csvParser = new Microsoft.VisualBasic.FileIO.TextFieldParser(filePath))
        {
            csvParser.TextFieldType = FieldType.Delimited;
            csvParser.SetDelimiters(",");
            csvParser.HasFieldsEnclosedInQuotes = false;
            csvParser.TrimWhiteSpace = true;

            while (!csvParser.EndOfData)
            {

                try
                {
                    string[] row = csvParser.ReadFields();
                    if (row.Length <= 7)
                    {
                        DenialRecord dr = new DenialRecord(row[0], row[1], row[2], row[3], row[4], row[5], row[6]);
                        inputList.Add(dr);
                    }
                }
                catch (Exception e)
                {
                    // do something
                    Console.WriteLine("Error is:  {0}", e.ToString());
                }
            }
            csvParser.Close();
            csvParser.Dispose();
        }
        return inputList;
    }
}
}

编辑：

添加的错误列表：

Error 1 } expected c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 43 10 InputSide
Error 2 Invalid token 'using' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 46 13 InputSide
Error 3 ; expected c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 46 77 InputSide
Error 4 Invalid token '=' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 48 41 InputSide
Error 5 Invalid token ';' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 48 62 InputSide
Error 6 Invalid token '(' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 49 40 InputSide
Error 7 Invalid token '=' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 50 53 InputSide
Error 8 Invalid token '=' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 51 42 InputSide
Error 9 Invalid token ')' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 53 44 InputSide
Error 10 Invalid token 'if' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 59 25 InputSide
Error 11 Invalid token '<=' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 59 40 InputSide
Error 12 Invalid token '(' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 62 42 InputSide
Error 13 Invalid token ')' in class, struct, or interface member declaration c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 62 45 InputSide
Error 14 A namespace cannot directly contain members such as fields or methods c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 65 21 InputSide
Error 15 Type or namespace definition, or end-of-file expected c:\users\jas189\documents\visual studio 2013\Projects\InputSide\InputSide\CsvLoader.cs 70 17 InputSide
Error 16 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.filePath' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 46 68 InputSide
Error 17 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.csvParser' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 58 40 InputSide Error 18 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 64 InputSide
Error 19 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 72 InputSide
Error 20 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 80 InputSide
Error 21 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 88 InputSide
Error 22 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 96 InputSide
Error 23 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 104 InputSide
Error 24 A field initializer cannot reference the non-static field, method, or property 'InputSide.CsvLoader.row' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 61 112 InputSide
Error 25 'InputSide.CsvLoader.CsvList(int)': not all code paths return a value c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 42 35 InputSide
Error 26 'InputSide.CsvLoader.csvParser' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 48 17 InputSide
Error 27 'Microsoft.VisualBasic.FileIO.FieldType.Delimited' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 48 53 InputSide Error 28 'InputSide.CsvLoader.csvParser' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 49 17 InputSide
Error 29 'InputSide.CsvLoader.csvParser' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 50 17 InputSide
Error 30 'InputSide.CsvLoader.csvParser' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 51 17 InputSide
Error 31 'InputSide.CsvLoader.csvParser' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 53 25 InputSide
Error 32 'InputSide.CsvLoader.row' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 59 29 InputSide
Error 33 'InputSide.CsvLoader.inputList' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 62 29 InputSide
Error 34 'InputSide.CsvLoader.dr' is a 'field' but is used like a 'type' c:\users\jas189\documents\visual studio 2013\projects\inputside\inputside\csvloader.cs 62 43 InputSide

Answer 1

最终工作代码：

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualBasic.FileIO;
using ExportToExcel;

namespace InputSide
{
    internal class CsvLoader
    {
        private int columnCount = 7;    // backing store
        private string filePath;
        private List<DenialRecord> inputList = new List<DenialRecord>();

        public List<DenialRecord> InputList
        {
            set
            {
                this.inputList = InputList;
            }
            get
            {
                return inputList;
            }
        }

        // Default constructor
        internal CsvLoader()
        {
        }

        // Exposed constructor
        public CsvLoader(List<DenialRecord> InputList,  string FilePath, int ColumnCount)
        {
            this.inputList = InputList;
            this.filePath = FilePath;
        }

        // Load csv to List<T>
        public List<DenialRecord> CsvList(int columnCount)
        {
            using (TextFieldParser csvParser = new TextFieldParser(filePath))
            {
                csvParser.TextFieldType = FieldType.Delimited;
                csvParser.SetDelimiters(",");
                csvParser.HasFieldsEnclosedInQuotes = false;
                csvParser.TrimWhiteSpace = true;

                while (!csvParser.EndOfData)
                {

                    try
                    {
                        string[] row = csvParser.ReadFields();
                        if (row.Length <= 7)
                        {
                            DenialRecord dr = new DenialRecord(row[0], row[1], row[2], row[3], row[4], row[5], row[6]);
                            inputList.Add(dr);
                        }
                    }
                    catch (Exception e)
                    {
                        // do something
                        Console.WriteLine("Error is:  {0}", e.ToString());
                    }
                }
                csvParser.Close();
                csvParser.Dispose();
            }
            return inputList;
        }
    }
}

Answer 2

除了可能缺少对 Microsoft.VisualBasic 的引用之外：

在CsvList

您不能声明 private int columnCount; 因为该名称已用作参数并且
您应该使用if (row.Length == 7)，因为如果元素少于七个，则DenialRecord dr = new DenialRecord(row[0], row[1], row[2], row[3], row[4], row[5], row[6]);将失败并在[=处出现"Index out of bounds"错误28=]-时间.

C# 中的 TextFieldParser 问题

Issue with TextFieldParser in C#

c#

csv

generics

using

textfieldparser