C# txt文本文件的读取与写入,

C# 保存文本，保存txt文本文件的方法

写入：将文本内容写入(保存)txt文本文件

覆盖写入方法一

/// <summary>
/// 保存Site文件
/// </summary>
public void WriteXML(string content)
{
	string fileName = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot\\sitemap.xml");
	using (FileStream fs = new FileStream(fileName, FileMode.Create))
	{
		using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
		{
			//开始写入
			sw.Write(content);
			//清空缓冲区
			sw.Flush();
		}
	}
}

覆盖写入方法二：

public void Write()
{
	FileStream fs = new FileStream("E:\\ak.txt", FileMode.Create);
	//获得字节数组
	byte[] data = System.Text.Encoding.Default.GetBytes("Hello World!"); 
	//开始写入
	fs.Write(data, 0, data.Length);
	//清空缓冲区、关闭流
	fs.Flush();
	fs.Close();
}

追加写入：

public static void Info(string Msg)
{
	try
	{
		string fileName = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Log\\Info\\info-" + DateTime.Now.ToString("yyyyMMdd") + ".lg");
		string path = Path.GetDirectoryName(fileName);
		if (!System.IO.Directory.Exists(path))
		{
			System.IO.Directory.CreateDirectory(path);
			System.IO.File.CreateText(fileName).Dispose();
		}
		else if (!System.IO.File.Exists(fileName))
		{
			System.IO.File.CreateText(fileName).Dispose();
		}
		using (TextWriter writer2 = System.IO.File.AppendText(fileName))
		{
			writer2.WriteLine(Msg);
		}
	}
	catch (Exception ex)
	{

	}
}

读取：读取文本文件内容

1. 整个文件读取：File.ReadAlText一行代码读取文本文件的所有内容

string txt = System.IO.File.ReadAllText("C:\text.txt", Encoding.UTF8);

2. 按行读取：使用StreamReader读取文件，然后一行一行的输出

public void Read(string path)
{
	StreamReader sr = new StreamReader(path,Encoding.Default);
	String line;
	while ((line = sr.ReadLine()) != null) 
	{
		Console.WriteLine(line.ToString());
	}
}