[Unity工具]CSV工具类

参考链接：

https://www.cnblogs.com/lulianqi/p/6385503.html

http://blog.csdn.net/paul342/article/details/22800137

说明：

1.写入一个单元格时，如果含有逗号，则需要将整个字段用双引号括起来；如果里面还有双引号就替换成两个双引号。

2.写入一行时，末尾要加上\r\n作为行分隔符。

3.读取时，也要根据上面的写入规则进行解析。

代码如下：

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

 public class CSVTool {

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

     //获取一个单元格的写入格式
     public static string GetCSVFormat(string str)
     {
         string tempStr = str;
         if (str.Contains(","))
         {
             if (str.Contains("\""))
             {
                 tempStr = str.Replace("\"", "\"\"");
             }
             tempStr = "\"" + tempStr + "\"";
         }
         return tempStr;
     }

     //获取一行的写入格式
     public static string GetCSVFormatLine(List<string> strList)
     {
         string tempStr = "";
         for (int i = ; i < strList.Count - ; i++)
         {
             string str = strList[i];
             tempStr = tempStr + GetCSVFormat(str) + ",";
         }
         tempStr = tempStr + GetCSVFormat(strList[strList.Count - ]) + "\r\n";
         return tempStr;
     }

     //解析一行
     public static List<string> ParseLine(string line)
     {
         StringBuilder _columnBuilder = new StringBuilder();
         List<string> Fields = new List<string>();
         bool inColumn = false;  //是否是在一个列元素里
         bool inQuotes = false;  //是否需要转义
         bool isNotEnd = false;  //读取完毕未结束转义
         _columnBuilder.Remove(, _columnBuilder.Length);

         //空行也是一个空元素,一个逗号是2个空元素
         if (line == "")
         {
             Fields.Add("");
         }

         // Iterate through every character in the line
         for (int i = ; 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 + ) == line.Length)//这个字符已经结束了整行
                 {
                     if (character == '"') //正常转义结束，且该行已经结束
                     {
                         inQuotes = false;
                         continue;     //当前字符不用添加，跳出后直结束后会添加该元素
                     }
                     else //异常结束，转义未收尾
                     {
                         isNotEnd = true;
                     }
                 }
                 else if (character == '"' && line[i + ] == _csvSeparator) //结束转义，且后面有可能还有数据
                 {
                     inQuotes = false;
                     inColumn = false;
                     i++; //跳过下一个字符
                 }
                 else if (character == '"' && line[i + ] == '"') //双引号转义
                 {
                     i++; //跳过下一个字符
                 }
                 else if (character == '"') //双引号单独出现（这种情况实际上已经是格式错误，为了兼容可暂时不处理）
                 {
                     throw new Exception("格式错误，错误的双引号转义");
                 }
                 //其他情况直接跳出，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) //结束该元素时inColumn置为false，并且不处理当前字符，直接进行Add
             {
                 Fields.Add(_trimColumns ? _columnBuilder.ToString().Trim() : _columnBuilder.ToString());
                 _columnBuilder.Remove(, _columnBuilder.Length);

             }
             else // append the current column
                 _columnBuilder.Append(character);
         }

         // If we are still inside a column add a new one （标准格式一行结尾不需要逗号结尾，而上面for是遇到逗号才添加的，为了兼容最后还要添加一次）
         if (inColumn)
         {
             if (isNotEnd)
             {
                 _columnBuilder.Append("\r\n");
             }
             Fields.Add(_trimColumns ? _columnBuilder.ToString().Trim() : _columnBuilder.ToString());
         }
         else  //如果inColumn为false，说明已经添加，因为最后一个字符为分隔符，所以后面要加上一个空元素
         {
             Fields.Add("");
         }

         return Fields;
     }

     //读取文件
     public static List<List<string>> Read(string filePath, Encoding encoding)
     {
         List<List<string>> result = new List<List<string>>();
         string content = File.ReadAllText(filePath, encoding);
         string[] lines = content.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
         for (int i = ; i < lines.Length; i++)
         {
             List<string> line = ParseLine(lines[i]);
             result.Add(line);
         }
         return result;
     }

     //写入文件
     public static void Write(string filePath, Encoding encoding, List<List<string>> result)
     {
         StringBuilder builder = new StringBuilder();
         for (int i = ; i < result.Count; i++)
         {
             List<string> line = result[i];
             builder.Append(GetCSVFormatLine(line));
         }
         File.WriteAllText(filePath, builder.ToString(), encoding);
     }

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

测试：