创建和读写文件的一些简单方法

1 使用StreamWriter向文件写入数据

[c-sharp] view plaincopyprint?

1. public static void WriteToLog(string logFileName, string data)  
2.         {  
3.             using (FileStream fileStream = new FileStream(logFileName, FileMode.Append, FileAccess.Write, FileShare.None))  
4.             {  
5.                 using (StreamWriter streamWrtie = new StreamWriter(fileStream))  
6.                 {  
7.                     streamWrtie.Write(data);  
8.                 }  
9.             }  
10.         }  

public static void WriteToLog(string logFileName, string data) { using (FileStream fileStream = new FileStream(logFileName, FileMode.Append, FileAccess.Write, FileShare.None)) { using (StreamWriter streamWrtie = new StreamWriter(fileStream)) { streamWrtie.Write(data); } } }

2 用StreamReader读取文本

[c-sharp] view plaincopyprint?

1. public static string  ReadAllLog(string logFileName)  
2.        {  
3.            if (!File.Exists(logFileName))  
4.            {  
5.                throw (new FileNotFoundException("logfile does not exit", logFileName));  
6.            }  
7.            string contents = "";  
8.            using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))  
9.            {  
10.                using (StreamReader streamRead = new StreamReader(fileStream))  
11.                {  
12.                    contents = streamRead.ReadToEnd();  
13.                }  
14.            }  
15.            return contents;  
16.        }  

public static string ReadAllLog(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } string contents = ""; using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamRead = new StreamReader(fileStream)) { contents = streamRead.ReadToEnd(); } } return contents; }

3 要逐行的读取文本，则使用peek（）方法

[c-sharp] view plaincopyprint?

1. public static void ReadLogPeeking(string logFileName)  
2.         {  
3.             if (!File.Exists(logFileName))  
4.             {  
5.                 throw (new FileNotFoundException("logfile does not exit", logFileName));  
6.             }  
7.             using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))  
8.             {  
9.                 using (StreamReader streamReader = new StreamReader(fileStream))  
10.                 {  
11.                     while (streamReader.Peek() != -1)  
12.                     {  
13.                         Console.WriteLine(streamReader.ReadLine());  
14.                     }  
15.                 }  
16.             }  
17.         }  

public static void ReadLogPeeking(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.ReadLine()); } } } }

或

[c-sharp] view plaincopyprint?

1. public static void ReadLogByLines(string logFileName)  
2.         {  
3.             if (!File.Exists(logFileName))  
4.             {  
5.                 throw (new FileNotFoundException("logfile does not exit", logFileName));  
6.             }  
7.             using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))  
8.             {  
9.                 using (StreamReader streamReader = new StreamReader(fileStream))  
10.                 {  
11.                     string text = streamReader.ReadLine();  
12.                     while (text != null)  
13.                     {  
14.                         Console.WriteLine(text);  
15.                         text = streamReader.ReadLine();  
16.                     }  
17.                 }  
18.             }  
19.         }  

public static void ReadLogByLines(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { string text = streamReader.ReadLine(); while (text != null) { Console.WriteLine(text); text = streamReader.ReadLine(); } } } }

4 若要读取一个字节则用read()方法

[c-sharp] view plaincopyprint?

1. public static void ReadLogAsBytes(string logFileName)  
2.        {  
3.            if (!File.Exists(logFileName))  
4.            {  
5.                throw (new FileNotFoundException("logfile does not exit", logFileName));  
6.            }  
7.            using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))  
8.            {  
9.                using (StreamReader streamReader = new StreamReader(fileStream))  
10.                {  
11.                    while (streamReader.Peek() != -1)  
12.                    {  
13.                        Console.WriteLine(streamReader.Read());  
14.                    }  
15.                }  
16.            }  
17.        }  

public static void ReadLogAsBytes(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.Read()); } } } }

5 按块读取，则要创建一个任意长度的缓冲区,这个长度根据你的性能需求来决定

[c-sharp] view plaincopyprint?

1. public static void ReadAllBuffereLog(string logFileName)  
2.         {  
3.             if (!File.Exists(logFileName))  
4.             {  
5.                 throw (new FileNotFoundException("logfile does not exit", logFileName));  
6.             }  
7.             using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))  
8.             {  
9.                 using (StreamReader streamReader = new StreamReader(fileStream))  
10.                 {  
11.                     while (streamReader.Peek() != -1)  
12.                     {  
13.                         char[] buffer=new char [10];  
14.                         int bufferFileSize = streamReader.Read(buffer, 0, 10);  
15.                         foreach (char c in buffer)  
16.                         {  
17.                             Console.Write(c);  
18.                         }  
19.                         Console.WriteLine();  
20.                         Console.WriteLine(bufferFileSize);  
21.                     }  
22.                 }  
23.             }  
24.         }