我要评论读取文本文件中的内容
此示例读取文本文件的内容以使用 system.io.file 选件类的静态方法 readalltext 和 readalllines。
class readfromfile
{
static void main()
{
// the files used in this example are created in the topic
// how to: write to a text file. you can change the path and
// file name to substitute text files of your own.
// example #1
// read the file as one string.
string text = system.io.file.readalltext(@"c:\users\public\testfolder\writetext.txt");
// display the file contents to the console. variable text is a string.
system.console.writeline("contents of writetext.txt = {0}", text);
// example #2
// read each line of the file into a string array. each element
// of the array is one line of the file.
string[] lines = system.io.file.readalllines(@"c:\users\public\testfolder\writelines2.txt");
// display the file contents by using a foreach loop.
system.console.writeline("contents of writelines2.txt = ");
foreach (string line in lines)
{
// use a tab to indent each line of the file.
console.writeline("\t" + line);
}
// keep the console window open in debug mode.
console.writeline("press any key to exit.");
system.console.readkey();
}
}
一次一行地读取文本文件
本示例使用 streamreader 类的 readline 方法将文本文件的内容读取（一次读取一行）到字符串中。所有文本行都保存在字符串 line 中并显示在屏幕上。
int counter = 0;
string line;
// read the file and display it line by 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);
// suspend the screen.
system.console.readline();
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