C# 读取文件内容

读取文件内容有三种方式

• 全部读取到字符串变量中
• 一次读取一行
• 全部读取到字符串数组中，每个数组元素存储一行文本

全部读取到字符串变量

string text = System.IO.File.ReadAllText(@"C:\Users\Public\TestFolder\WriteText.txt");

System.Console.WriteLine("Contents of WriteText.txt = {0}", text);

一次读取一行

int counter = ;
string line;  

System.IO.StreamReader file =
    new System.IO.StreamReader(@"c:\test.txt");
while((line = file.ReadLine()) != null)
{
    System.Console.WriteLine(line);
    counter++;
}  

file.Close();
System.Console.WriteLine("There were {0} lines.", counter);  

全部读取到字符串数组中，每个数组元素存储一行文本

string[] lines = System.IO.File.ReadAllLines(@"C:\Users\Public\TestFolder\WriteLines2.txt");

System.Console.WriteLine("Contents of WriteLines2.txt = ");
foreach (string line in lines)
{
    Console.WriteLine("\t" + line);
}