File、FileStream、StreamWriter、StringWriter文件使用總結

一、File

1、File為靜態類

File類，是一個靜態類，支持對文件的基本操作，包括創建，拷貝，移動，刪除和打開一個文件。File類方法的參量很多時候都是路徑path。主要提供有關文件的各種操作，在使用時需要引用System.IO命名空間。

常用的方法

 

二、FileStream

FileStream文件流 只能處理原始字節(raw byte)。FileStream 類可以用於任何數據文件，而不僅僅是文本文件。FileStream 對象可以用於讀取諸如圖像和聲音的文件，FileStream讀取出來的是字節數組，然后通過編碼轉換將字節數組轉換成字符串。

string str = "今天天氣好晴朗，處處好風光";
            byte[] buttf = Encoding.Default.GetBytes(str);
            //文件流的寫入
            using (FileStream fscreat = new FileStream(path, FileMode.Append, FileAccess.Write))
            {
                fscreat.Write(buttf, 0, buttf.Length);
            }

三、StreamWriter

StreamWriter 類主要用於向流中寫入數據

屬性或方法	作用
bool AutoFlush	屬性，獲取或設置是否自動刷新緩沖區
Encoding Encoding	只讀屬性，獲取當前流中的編碼方式
void Close()	關閉流
void Flush()	刷新緩沖區
void Write(char value)	將字符寫入流中
void WriteLine(char value)	將字符換行寫入流中
Task WriteAsync(char value)	將字符異步寫入流中
Task WriteLineAsync(char value)	將字符異步換行寫入流中

 

    class Program
    {
        static void Main(string[] args)
        {
            string path = @"D:\\code\\test.txt";
            //創建StreamWriter 類的實例
            StreamWriter streamWriter = new StreamWriter(path);
            //向文件中寫入姓名
            streamWriter.WriteLine("小張");
            //向文件中寫入手機號
            streamWriter.WriteLine("13112345678");
            //刷新緩存
            streamWriter.Flush();
            //關閉流
            streamWriter.Close();
        }
    }

四、StringWriter

實現用於將信息寫入字符串的 TextWriter。 信息存儲在基礎 StringBuilder 中。

using System;
using System.IO;

class StringRW
{
    static void Main()
    {
        string textReaderText = "TextReader is the abstract base " +
            "class of StreamReader and StringReader, which read " +
            "characters from streams and strings, respectively.\n\n" +

            "Create an instance of TextReader to open a text file " +
            "for reading a specified range of characters, or to " +
            "create a reader based on an existing stream.\n\n" +

            "You can also use an instance of TextReader to read " +
            "text from a custom backing store using the same " +
            "APIs you would use for a string or a stream.\n\n";

        Console.WriteLine("Original text:\n\n{0}", textReaderText);

        // From textReaderText, create a continuous paragraph 
        // with two spaces between each sentence.
        string aLine, aParagraph = null;
        StringReader strReader = new StringReader(textReaderText);
        while(true)
        {
            aLine = strReader.ReadLine();
            if(aLine != null)
            {
                aParagraph = aParagraph + aLine + " ";
            }
            else
            {
                aParagraph = aParagraph + "\n";
                break;
            }
        }
        Console.WriteLine("Modified text:\n\n{0}", aParagraph);

        // Re-create textReaderText from aParagraph.
        int intCharacter;
        char convertedCharacter;
        StringWriter strWriter = new StringWriter();
        strReader = new StringReader(aParagraph);
        while(true)
        {
            intCharacter = strReader.Read();

            // Check for the end of the string 
            // before converting to a character.
            if(intCharacter == -1) break;

            convertedCharacter = Convert.ToChar(intCharacter);
            if(convertedCharacter == '.')
            {
                strWriter.Write(".\n\n");

                // Bypass the spaces between sentences.
                strReader.Read();
                strReader.Read();
            }
            else
            {
                strWriter.Write(convertedCharacter);
            }
        }
        Console.WriteLine("\nOriginal text:\n\n{0}", 
            strWriter.ToString());
    }
}