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();
dy("nrwz");
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