如何向現有文件中添加文本
using?System;
using?System.IO;class?Test?
{public?static?void?Main()?{//?Create?an?instance?of?StreamWriter?to?write?text?to?a?file.//?The?using?statement?also?closes?the?StreamWriter.using?(StreamWriter?sw?=?new?StreamWriter("TestFile.txt"))?{//?Add?some?text?to?the?file.sw.Write("This?is?the?");sw.WriteLine("header?for?the?file.");sw.WriteLine("-------------------");//?Arbitrary?objects?can?also?be?written?to?the?file.sw.Write("The?date?is:?");sw.WriteLine(DateTime.Now);}}
}




如何創建一個新文本文件并向其中寫入一個字符串。WriteAllText方法可提供類似的功能。
using?System;
using?System.IO;
public?class?TextToFile?
{private?const?string?FILE_NAME?=?"MyFile.txt";public?static?void?Main(String[]?args)?{if?(File.Exists(FILE_NAME))?{Console.WriteLine("{0}?already?exists.",?FILE_NAME);return;}using?(StreamWriter?sw?=?File.CreateText(FILE_NAME)){sw.WriteLine?("This?is?my?file.");sw.WriteLine?("I?can?write?ints?{0}?or?floats?{1},?and?so?on.",?1,?4.2);sw.Close();}}
}
如何從文本文件中讀取文本
using?System;
using?System.IO;class?Test?
{public?static?void?Main()?{try?{//?Create?an?instance?of?StreamReader?to?read?from?a?file.//?The?using?statement?also?closes?the?StreamReader.using?(StreamReader?sr?=?new?StreamReader("TestFile.txt"))?{String?line;//?Read?and?display?lines?from?the?file?until?the?end?of?//?the?file?is?reached.while?((line?=?sr.ReadLine())?!=?null)?{Console.WriteLine(line);}}}catch?(Exception?e)?{//?Let?the?user?know?what?went?wrong.Console.WriteLine("The?file?could?not?be?read:");Console.WriteLine(e.Message);}}
}
在檢測到文件結尾時向您發出通知。通過使用?ReadAll或?ReadAllText方法也可以實現此功能。
using?System;
using?System.IO;
public?class?TextFromFile?
{private?const?string?FILE_NAME?=?"MyFile.txt";public?static?void?Main(String[]?args)?{if?(!File.Exists(FILE_NAME))?{Console.WriteLine("{0}?does?not?exist.",?FILE_NAME);return;}using?(StreamReader?sr?=?File.OpenText(FILE_NAME)){String?input;while?((input=sr.ReadLine())!=null)?{Console.WriteLine(input);}Console.WriteLine?("The?end?of?the?stream?has?been?reached.");sr.Close();}}

?

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