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Updated: 9/16/2002 - Thanks to Charles C., Paul M., and Joel M. for pointing out the faulty code.
In this article we will look at a technique that allows us to open a text file and stream its contents to the browser. We will also use
the Try..Catch style of error handling (Best Practice Alert!). Read about structured error handling
here.
Note: This is not the only technique to open a text file and my not be the preferred technique given certain circumstances.
The code below opens a text file (words.txt) and uses the File class to open a stream using the StreamReader class. We use the StreamReader class
to loop through each line in the file, appending (Best Practice Alert! Read about string concatenation best practices
here.) it to the string variable myOutputString as we go.
<%@ Page Language="VB" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<html>
<script language="VB" runat=server>
Sub Page_Load(source As Object, E As EventArgs)
Dim FileName As String = Server.MapPath("words.txt")
Dim FileContents As String
Dim myStreamReader As StreamReader
Try
myStreamReader = File.OpenText(strFile)
FileContents = myStreamReader.ReadToEnd()
Label1.Text = FileContents
Catch myException As Exception
If Not myStreamReader Is Nothing Then
myStreamReader.Close()
End If
End Try
End Sub
</script>
</html>
Result:
This
is
a
test
file
with
some
some
repeated
words
that
the
program
will
insert
into
an
Label Control
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