Use foreach in ASP. NET to simplify access to text files.

In many cases, we always access text files in line mode. Using the foreach statement can greatly simplify the access logic: for example:
Foreach (string line in new linereader ("C: \ abc.txt "))
Console. writeline (line );
Complete Code As follows:
Using system;
Using system. IO;
Using system. text;
Using system. collections;
Namespace forks. utils. Io
{
Public struct linereader: idisposable
{
Public linereader (string file, encoding): This (file, encoding, false)
{
}
Public linereader (string file, encoding, bool ignoreblanklines): This (New filestream (file, filemode. Open, fileaccess. Read, fileshare. Read), encoding, ignoreblanklines)
{
}
Public linereader (Stream stream, encoding): This (stream, encoding, false)
{
}
Public linereader (Stream stream, encoding, bool ignoreblklines): This (New streamreader (stream, encoding), ignoreblklines)
{
}
Public linereader (textreader reader): This (reader, false)
{
}
Textreader mreader;
Bool mignoreblanklines;
Public linereader (textreader reader, bool ignoreblanklines)
{
Mreader = reader;
Mignoreblanklines = ignoreblanklines;
Mcurrent = NULL;
}
Public linereader getenumerator ()
{
Return this;
}
Public void reset ()
{
Throw new notsupportedexception ");
}
String mcurrent;
Public String current
{
Get
{
Return mcurrent;
}
}
Public bool movenext ()
{
Do
{
Mcurrent = mreader. Readline ();
} While (mignoreblanklines & mcurrent! = NULL & mcurrent. Length = 0 );
Return mcurrent! = NULL;
}
Public void dispose ()
{
Mreader. Close ();
}
}
}
Test code:
Using system;
Using system. IO;
Using system. text;
Using nunit. Framework;
Using forks. test;
Namespace forks. utils. Io
{
[Testfixture]
Public class linereadertest
{
Const string testlines = @ "ABC ASD EWR AFA E
Start with blanks
End with blanks
° ×Öabc123! @#
End of text! ";
[Test]
Public void readfromreader ()
{
Dotest (New linereader (New stringreader (testlines )));
}
[Test]
Public void readfromfile ()
{
String file = path. gettempfilename ();
Try
{
Stringutil. savetofile (testlines, file, encoding. getencoding ("gb2312 "));
Dotest (New linereader (file, encoding. getencoding ("gb2312 ")));
}
Finally
{
Fileutil. safedelete (File );
}
}
[Test]
Public void readfromstream ()
{
String file = path. gettempfilename ();
Try
{
Stringutil. savetofile (testlines, file, encoding. getencoding ("gb2312 "));
Using (Stream stream = new filestream (file, filemode. Open ))
Dotest (New linereader (stream, encoding. getencoding ("gb2312 ")));
}
Finally
{
Fileutil. safedelete (File );
}
}
Void dotest (linereader reader)
{
Stringbuilder sb = new stringbuilder ();
Foreach (string line in Reader)
SB. append (LINE + environment. newline );
Assert. areequal (testlines + environment. newline, SB. tostring ());
}
[Test]
Public void ignoreblankline ()
{
Foreach (string line in new linereader (New stringreader (testlines), true ))
Assert. istrue (line. length! = 0 );
}
}
}