.Net开源CSV文件处理组件学习
CSV文件是比较常用的数据存储格式,.net系统下csv组件是一个短小简洁的开源组件,项目地址:https://github.com/stevehansen/csv
我有一种感觉,短小精悍的解决特定问题的部件要优于比较复杂的框架。
读取的示例(甚至没有从文件中读取的函数,充分体现了简洁的设计):
var csv = File.ReadAllText("sample.csv"); foreach (var line in CsvReader.ReadFromText(csv)) { // Header is handled, each line will contain the actual row data var firstCell = line[0]; var byName = line["Column name"]; }
写入示例:
var columnNames = new [] { "Id", "Name" }; var rows = new [] { new [] { "0", "John Doe" }, new [] { "1", "Jane Doe" } }; var csv = CsvWriter.WriteToText(columnNames, rows, ','); File.WriteAllText("people.csv", csv);
还有一些处理选项(下面是缺省的):
var options = new CsvOptions // Defaults { RowsToSkip = 0, // 开头跳过的行数 SkipRow = (row, idx) => string.IsNullOrEmpty(row) || row[0] == '#', //空行或者#开始的行被忽略 Separator = '\0', // 每一行的分割符,并且根据第1行的情况自动处理 TrimData = false, // 针对每一个单元是否截去前后空格 Comparer = null, // Can be used for case-insensitive comparison for names HeaderMode = HeaderMode.HeaderPresent, // 第一行设置为标题行 ValidateColumnCount = false, // Checks each row immediately for column count ReturnEmptyForMissingColumn = false, // 对于无效列名,是否返回空
//下面是针对特殊符号的处理
Aliases = null, // A collection of alternative column names AllowNewLineInEnclosedFieldValues = false, // Respects new line (either \r\n or \n) characters inside field values enclosed in double quotes. AllowBackSlashToEscapeQuote = false, // Allows the sequence "\"" to be a valid quoted value (in addition to the standard """") AllowSingleQuoteToEncloseFieldValues = false, // Allows the single-quote character to be used to enclose field values NewLine = Environment.NewLine // The new line string to use when multiline field values are read (Requires "AllowNewLineInEnclosedFieldValues" to be set to "true" for this to have any effect.) };