閱讀csv文件c＃

Question

有什麼方法可以將csv文件讀入矩陣，因此文件中的每個正方形都將是矩陣中的單元格？

Answer 1

有許多開源CSV閱讀器，它也很容易編碼你自己的。

一開始採取看看codeplex.com： http://kbcsv.codeplex.com/

或者CodeProject上的教程： http://www.codeproject.com/KB/database/CsvReader.aspx

完成的緣故，這裏是我自己的實用類閱讀從CSV文件一行：

/// <summary> 
    /// Defines CSV reader states 
    /// </summary> 
    enum State 
    { 
     Initial, 
     Quote, 
     Data, 
     NestedQuote 
    } 

    /// <summary> 
    /// Initializes a new instance of the <see cref="CsvReader"/> class. 
    /// </summary> 
    /// <param name="inputStream">The input stream.</param> 
    public CsvReader(Stream inputStream) 
    { 
     if (inputStream == null) 
      throw new ArgumentNullException("inputStream"); 

     reader = new StreamReader(inputStream); 
    } 

    /// <summary> 
    /// Reads a single line of CSV data. 
    /// </summary> 
    /// <returns>Array of CSV fields</returns> 
    public string[] Read() 
    { 
     var line = reader.ReadLine(); 
     var retval = new List<string>(); 

     if (line == null) 
      return null; 

     var state = State.Initial; 
     var text = new StringBuilder(); 

     foreach (var ch in line) 
      switch (state) 
      { 
       case State.Initial: 
        if (ch == '"') 
         state = State.Quote; 
        else if (ch == ',') 
         retval.Add(string.Empty); 
        else 
        { 
         text.Append(ch); 
         state = State.Data; 
        } 

        break; 

       case State.Data: 
        if (ch == ',') 
        { 
         retval.Add(text.ToString()); 
         text.Length = 0; 
         state = State.Initial; 
        } 
        else 
         text.Append(ch); 

        break; 

       case State.Quote: 
        if (ch == '"') 
         state = State.NestedQuote; 
        else 
         text.Append(ch); 

        break; 

       case State.NestedQuote: 
        if (ch == '"') 
        { 
         text.Append('"'); 
         state = State.Quote; 
         break; 
        } 

        state = State.Data; 
        goto case State.Data; 
      } 

     retval.Add(text.ToString()); 

     return retval.ToArray(); 
    } 

    /// <summary> 
    /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. 
    /// </summary> 
    public void Dispose() 
    { 
     reader.Dispose(); 
    } 

爲了使矩陣（未測試）：

var data = new List<string[]>(); 
string[] line; 

using(reader = new CsvReader(stream)) 
    while((line = reader.Read()) != null) 
    data.Add(line); 

result = data.Select(row => row.Select(cell => int.Parse(cell)).ToArray()).ToArray(); 

Answer 2

有很多方法。從逐字節讀取器開始。這取決於你的CSV文件格式（有/無頭，行尾「或「），我寫我自己的類

一個好的讀者開始：。

http://www.stellman-greene.com/CSVReader/

Answer 3

有在VisualBasic中命名空間的文本閱讀器，可以在C＃中使用和處理甚至可怕的CSV文件時效果很好。

TextFieldParser

只是在你的項目中添加引用Microsoft.VisualBasic

Answer 4

CSV使用正則表達式解析：http://www.hotblue.com/article0000.aspx?a=0006

擴大與自定義分隔的概念，看到這個帖子：How do I write a regex to match a string that doesn't contain a word?