如果你只需要读取csv文件，那么我推荐这个库:一个快速csv阅读器 如果你还需要生成csv文件，那么使用FileHelpers

它们都是免费和开源的。

如果任何人想要一个代码片段，他们可以直接输入自己的代码，而不必绑定库或下载包。以下是我写的一个版本:

    public static string FormatCSV(List<string> parts)
    {
        string result = "";

        foreach (string s in parts)
        {
            if (result.Length > 0)
            {
                result += ",";

                if (s.Length == 0)
                    continue;
            }

            if (s.Length > 0)
            {
                result += "\"" + s.Replace("\"", "\"\"") + "\"";
            }
            else
            {
                // cannot output double quotes since its considered an escape for a quote
                result += ",";
            }
        }

        return result;
    }

    enum CSVMode
    {
        CLOSED = 0,
        OPENED_RAW = 1,
        OPENED_QUOTE = 2
    }

    public static List<string> ParseCSV(string input)
    {
        List<string> results;

        CSVMode mode;

        char[] letters;

        string content;


        mode = CSVMode.CLOSED;

        content = "";
        results = new List<string>();
        letters = input.ToCharArray();

        for (int i = 0; i < letters.Length; i++)
        {
            char letter = letters[i];
            char nextLetter = '\0';

            if (i < letters.Length - 1)
                nextLetter = letters[i + 1];

            // If its a quote character
            if (letter == '"')
            {
                // If that next letter is a quote
                if (nextLetter == '"' && mode == CSVMode.OPENED_QUOTE)
                {
                    // Then this quote is escaped and should be added to the content

                    content += letter;

                    // Skip the escape character
                    i++;
                    continue;
                }
                else
                {
                    // otherwise its not an escaped quote and is an opening or closing one
                    // Character is skipped

                    // If it was open, then close it
                    if (mode == CSVMode.OPENED_QUOTE)
                    {
                        results.Add(content);

                        // reset the content
                        content = "";

                        mode = CSVMode.CLOSED;

                        // If there is a next letter available
                        if (nextLetter != '\0')
                        {
                            // If it is a comma
                            if (nextLetter == ',')
                            {
                                i++;
                                continue;
                            }
                            else
                            {
                                throw new Exception("Expected comma. Found: " + nextLetter);
                            }
                        }
                    }
                    else if (mode == CSVMode.OPENED_RAW)
                    {
                        // If it was opened raw, then just add the quote 
                        content += letter;
                    }
                    else if (mode == CSVMode.CLOSED)
                    {
                        // Otherwise open it as a quote 

                        mode = CSVMode.OPENED_QUOTE;
                    }
                }
            }
            // If its a comma seperator
            else if (letter == ',')
            {
                // If in quote mode
                if (mode == CSVMode.OPENED_QUOTE)
                {
                    // Just read it
                    content += letter;
                }
                // If raw, then close the content
                else if (mode == CSVMode.OPENED_RAW)
                {
                    results.Add(content);

                    content = "";

                    mode = CSVMode.CLOSED;
                }
                // If it was closed, then open it raw
                else if (mode == CSVMode.CLOSED)
                {
                    mode = CSVMode.OPENED_RAW;

                    results.Add(content);

                    content = "";
                }
            }
            else
            {
                // If opened quote, just read it
                if (mode == CSVMode.OPENED_QUOTE)
                {
                    content += letter;
                }
                // If opened raw, then read it
                else if (mode == CSVMode.OPENED_RAW)
                {
                    content += letter;
                }
                // It closed, then open raw
                else if (mode == CSVMode.CLOSED)
                {
                    mode = CSVMode.OPENED_RAW;

                    content += letter;
                }
            }
        }

        // If it was still reading when the buffer finished
        if (mode != CSVMode.CLOSED)
        {
            results.Add(content);
        }

        return results;
    }

CsvHelper(我维护的一个库)将把CSV文件读入自定义对象。

using (var reader = new StreamReader("path\\to\\file.csv"))
using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
{
    var records = csv.GetRecords<Foo>();
}

有时候你并不拥有你想读的对象。在这种情况下，您可以使用流畅映射，因为您不能将属性放在类上。

public sealed class MyCustomObjectMap : CsvClassMap<MyCustomObject>
{
    public MyCustomObjectMap()
    {
        Map( m => m.Property1 ).Name( "Column Name" );
        Map( m => m.Property2 ).Index( 4 );
        Map( m => m.Property3 ).Ignore();
        Map( m => m.Property4 ).TypeConverter<MySpecialTypeConverter>();
    }
}

如果你只需要读取csv文件，那么我推荐这个库:一个快速csv阅读器 如果你还需要生成csv文件，那么使用FileHelpers

它们都是免费和开源的。

单源文件解决方案用于简单的解析需求，非常有用。处理所有令人讨厌的边缘情况。比如新行归一化和在带引号的字符串字面量中处理新行。你的欢迎!

如果您的CSV文件有一个标题，您只需从第一行读出列名(并计算列索引)。就这么简单。

注意Dump是一个LINQPad方法，如果你不使用LINQPad，你可能想要删除它。

void Main()
{
    var file1 = "a,b,c\r\nx,y,z";
    CSV.ParseText(file1).Dump();

    var file2 = "a,\"b\",c\r\nx,\"y,z\"";
    CSV.ParseText(file2).Dump();

    var file3 = "a,\"b\",c\r\nx,\"y\r\nz\"";
    CSV.ParseText(file3).Dump();

    var file4 = "\"\"\"\"";
    CSV.ParseText(file4).Dump();
}

static class CSV
{
    public struct Record
    {
        public readonly string[] Row;

        public string this[int index] => Row[index];

        public Record(string[] row)
        {
            Row = row;
        }
    }

    public static List<Record> ParseText(string text)
    {
        return Parse(new StringReader(text));
    }

    public static List<Record> ParseFile(string fn)
    {
        using (var reader = File.OpenText(fn))
        {
            return Parse(reader);
        }
    }

    public static List<Record> Parse(TextReader reader)
    {
        var data = new List<Record>();

        var col = new StringBuilder();
        var row = new List<string>();
        for (; ; )
        {
            var ln = reader.ReadLine();
            if (ln == null) break;
            if (Tokenize(ln, col, row))
            {
                data.Add(new Record(row.ToArray()));
                row.Clear();
            }
        }

        return data;
    }

    public static bool Tokenize(string s, StringBuilder col, List<string> row)
    {
        int i = 0;

        if (col.Length > 0)
        {
            col.AppendLine(); // continuation

            if (!TokenizeQuote(s, ref i, col, row))
            {
                return false;
            }
        }

        while (i < s.Length)
        {
            var ch = s[i];
            if (ch == ',')
            {
                row.Add(col.ToString().Trim());
                col.Length = 0;
                i++;
            }
            else if (ch == '"')
            {
                i++;
                if (!TokenizeQuote(s, ref i, col, row))
                {
                    return false;
                }
            }
            else
            {
                col.Append(ch);
                i++;
            }
        }

        if (col.Length > 0)
        {
            row.Add(col.ToString().Trim());
            col.Length = 0;
        }

        return true;
    }

    public static bool TokenizeQuote(string s, ref int i, StringBuilder col, List<string> row)
    {
        while (i < s.Length)
        {
            var ch = s[i];
            if (ch == '"')
            {
                // escape sequence
                if (i + 1 < s.Length && s[i + 1] == '"')
                {
                    col.Append('"');
                    i++;
                    i++;
                    continue;
                }
                i++;
                return true;
            }
            else
            {
                col.Append(ch);
                i++;
            }
        }
        return false;
    }
}

前段时间我写了一个基于微软的CSV读写简单类。VisualBasic图书馆。使用这个简单的类，您将能够像使用二维数组一样使用CSV。你可以通过以下链接找到我的课程:https://github.com/ukushu/DataExporter

用法的简单例子:

Csv csv = new Csv("\t");//delimiter symbol

csv.FileOpen("c:\\file1.csv");

var row1Cell6Value = csv.Rows[0][5];

csv.AddRow("asdf","asdffffff","5")

csv.FileSave("c:\\file2.csv");

对于读取头，你只需要读取csv。行[0]单元格:)