說明：

1.寫入一個(gè)單元格時(shí)，如果含有逗號(hào)，則需要將整個(gè)字段用雙引號(hào)括起來；如果里面還有雙引號(hào)就替換成兩個(gè)雙引號(hào)。

2.寫入一行時(shí)，末尾要加上\r\n作為行分隔符。

3.讀取時(shí)，也要根據(jù)上面的寫入規(guī)則進(jìn)行解析。

直接看代碼：

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

public class CSVTool {

    private static char _csvSeparator = ',';
    private static bool _trimColumns = false;

    //獲取一個(gè)單元格的寫入格式
    public static string GetCSVFormat(string str)
    {
        string tempStr = str;
        if (str.Contains(","))
        {
            if (str.Contains("\""))
            {
                tempStr = str.Replace("\"", "\"\"");
            }
            tempStr = "\"" + tempStr + "\"";
        }
        return tempStr;
    }

    //獲取一行的寫入格式
    public static string GetCSVFormatLine(ListstrList)
    {
        string tempStr = "";
        for (int i = 0; i < strList.Count - 1; i++)
        {
            string str = strList[i];
            tempStr = tempStr + GetCSVFormat(str) + ",";
        }
        tempStr = tempStr + GetCSVFormat(strList[strList.Count - 1]) + "\r\n";
        return tempStr;
    }

    //解析一行
    public static ListParseLine(string line)
    {
        StringBuilder _columnBuilder = new StringBuilder();
        ListFields = new List();
        bool inColumn = false;  //是否是在一個(gè)列元素里
        bool inQuotes = false;  //是否需要轉(zhuǎn)義
        bool isNotEnd = false;  //讀取完畢未結(jié)束轉(zhuǎn)義
        _columnBuilder.Remove(0, _columnBuilder.Length);
        //空行也是一個(gè)空元素,一個(gè)逗號(hào)是2個(gè)空元素
        if (line == "")
        {
            Fields.Add("");
        }
        // Iterate through every character in the line
        for (int i = 0; i < line.Length; i++)
        {
            char character = line[i];
            // If we are not currently inside a column
            if (!inColumn)
            {
                // If the current character is a double quote then the column value is contained within
                // double quotes, otherwise append the next character
                inColumn = true;
                if (character == '"')
                {
                    inQuotes = true;
                    continue;
                }
            }
            // If we are in between double quotes
            if (inQuotes)
            {
                if ((i + 1) == line.Length)//這個(gè)字符已經(jīng)結(jié)束了整行
                {
                    if (character == '"') //正常轉(zhuǎn)義結(jié)束，且該行已經(jīng)結(jié)束
                    {
                        inQuotes = false;
                        continue;     //當(dāng)前字符不用添加，跳出后直結(jié)束后會(huì)添加該元素
                    }
                    else //異常結(jié)束，轉(zhuǎn)義未收尾
                    {
                        isNotEnd = true;
                    }
                }
                else if (character == '"' && line[i + 1] == _csvSeparator) //結(jié)束轉(zhuǎn)義，且后面有可能還有數(shù)據(jù)
                {
                    inQuotes = false;
                    inColumn = false;
                    i++; //跳過下一個(gè)字符
                }
                else if (character == '"' && line[i + 1] == '"') //雙引號(hào)轉(zhuǎn)義
                {
                    i++; //跳過下一個(gè)字符
                }
                else if (character == '"') //雙引號(hào)單獨(dú)出現(xiàn)（這種情況實(shí)際上已經(jīng)是格式錯(cuò)誤，為了兼容可暫時(shí)不處理）
                {
                    throw new Exception("格式錯(cuò)誤，錯(cuò)誤的雙引號(hào)轉(zhuǎn)義");
                }
                //其他情況直接跳出，后面正常添加
            }
            else if (character == _csvSeparator)
                inColumn = false;
            // If we are no longer in the column clear the builder and add the columns to the list
            if (!inColumn) //結(jié)束該元素時(shí)inColumn置為false，并且不處理當(dāng)前字符，直接進(jìn)行Add
            {
                Fields.Add(_trimColumns ? _columnBuilder.ToString().Trim() : _columnBuilder.ToString());
                _columnBuilder.Remove(0, _columnBuilder.Length);
            }
            else // append the current column
                _columnBuilder.Append(character);
        }
        //(標(biāo)準(zhǔn)格式一行結(jié)尾不需要逗號(hào)結(jié)尾，而上面for是遇到逗號(hào)才添加的，為了兼容還要添加一次)

        if (inColumn)
        {
            if (isNotEnd)
            {
                _columnBuilder.Append("\r\n");
            }
            Fields.Add(_trimColumns ? _columnBuilder.ToString().Trim() : _columnBuilder.ToString());
        }
        else  //如果inColumn為false，說明已經(jīng)添加，一個(gè)字符為分隔符，所以后面要加上一個(gè)空元素
        {
            Fields.Add("");
        }
        return Fields;
    }
    //讀取文件
    public static ListRead(string filePath, Encoding encoding)
    {
        Listresult = new List();
        string content = File.ReadAllText(filePath, encoding);
        string[] lines = content.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
        for (int i = 0; i < lines.Length; i++)
        {
            Listline = ParseLine(lines[i]);
            result.Add(line);
        }
        return result;
    }
    //寫入文件
    public static void Write(string filePath, Encoding encoding, Listresult)
    {
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < result.Count; i++)
        {
            Listline = result[i];
            builder.Append(GetCSVFormatLine(line));
        }
        File.WriteAllText(filePath, builder.ToString(), encoding);
    }

    //打印
    public static void Debug(Listresult)
    {
        for (int i = 0; i < result.Count; i++)
        {
            Listline = result[i];
            for (int j = 0; j < line.Count; j++)
            {
                UnityEngine.Debug.LogWarning(line[j]);
            }
        }
    }
}

關(guān)于UNITY的路徑有4個(gè)類型：

Application.dataPath：該路徑指向我們Unity編輯器的Asset文件夾

Application.persistentDataPath：該路徑指向iOS和Android的沙盒路徑

Application.streamingAssetsPath：streamingAsset文件夾路徑，在任何平臺(tái)都可以通過這個(gè)路徑讀取到文件夾里的內(nèi)容

Application.temporaryCachePath：臨時(shí)數(shù)據(jù)文件路徑