C# writes and reads out text files

Little scum · Posted on 10/10/2015 10:03:21 AM

class WriteTextFile
{
static void Main()
{
//如果文件不存在，则创建；存在则覆盖
//该方法写入字符数组换行显示
string[] lines = { "first line", "second line", "third line","第四行" };
System.IO.File.WriteAllLines(@"C:\testDir\test.txt", lines, Encoding.UTF8);
//如果文件不存在，则创建；存在则覆盖
string strTest = "该例子测试一个字符串写入文本文件。";
System.IO.File.WriteAllText(@"C:\testDir\test1.txt", strTest, Encoding.UTF8);
//在将文本写入文件前，处理文本行
//StreamWriter一个参数默认覆盖
//StreamWriter第二个参数为false覆盖现有文件，为true则把文本追加到文件末尾
using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\testDir\test2.txt",true))
{
foreach (string line in lines)
{
if (!line.Contains("second"))
{
file.Write(line);//直接追加文件末尾，不换行
file.WriteLine(line);// 直接追加文件末尾，换行
}
}
}
}
}

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