в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:20:23Z

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==A FileReader==

<p>To perform character-based file operations, you wrap a FileStream inside either a StreamReader or a StreamWriter.</p>

<source lang="csharp">using System;
using System.IO;

class MainClass {
public static void Main() {
FileStream fin;
string s;

try {
fin = new FileStream("test.txt", FileMode.Open);
}
catch(FileNotFoundException exc) {
Console.WriteLine(exc.Message + "Cannot open file.");
return ;
}

StreamReader fstr_in = new StreamReader(fin);

// Read the file line-by-line.
while((s = fstr_in.ReadLine()) != null) {
Console.WriteLine(s);
}

fstr_in.Close();
}
}</source>
<pre class=codeResult>asdfasdf</pre>

==Create StreamReader from a URL==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
class MainClass
{
static void Main(string[] args)
{
StreamReader reader = new StreamReader(WebRequest.Create("http://www.nfex.ru").GetResponse().GetResponseStream());
string line;
while ((line = reader.ReadLine()) != null)
{
Console.WriteLine(line);
}
}
}</source>
<pre class=codeResult><HTML>
<HEAD>
Java examples (example source code) Organized by topic </title>
...</pre>

==Create StreamReader through FileStream==

<source lang="csharp">using System;
using System.IO;
public class MainClass
{
static void Main(string[] args)
{
FileStream MyFileStream = new FileStream(@"c:\Testing.txt", FileMode.Open, FileAccess.Read, FileShare.None);
StreamReader MyStreamReader = new StreamReader(MyFileStream);

for (int i = 0; i < 99; i++)
{
int ch = MyStreamReader.Read();
Console.WriteLine(ch);

}
MyStreamReader.Close();
}
}</source>

==Create StringReader from String==

<source lang="csharp">using System;
using System.IO;
using System.Text;
class MainClass
{
public static void Main()
{
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
sw.Write("This is a test of the StringWriter class");
sw.Close();
StringReader sr = new StringReader(sb.ToString());
string EntireString;

EntireString = sr.ReadToEnd();
Console.WriteLine(EntireString);
sr.Close();
}
}</source>
<pre class=codeResult>This is a test of the StringWriter class</pre>

==Demonstrate StringReader and StringWriter==

<source lang="csharp">using System;
using System.IO;

class MainClass {
public static void Main() {
StringWriter strwtr = new StringWriter();

for(int i=0; i < 10; i++)
strwtr.WriteLine("This is i: " + i);

StringReader strrdr = new StringReader(strwtr.ToString());

string str = strrdr.ReadLine();
while(str != null) {
str = strrdr.ReadLine();
Console.WriteLine(str);
}

}
}</source>
<pre class=codeResult>This is i: 1
This is i: 2
This is i: 3
This is i: 4
This is i: 5
This is i: 6
This is i: 7
This is i: 8
This is i: 9</pre>

==Read decimal, string and char from a file using FileStream and StreamReader==

<source lang="csharp">using System;
using System.IO;
using System.Text;
static class MainClass
{
static void Main()
{
// Create a new file.
using (FileStream fs = new FileStream("test.txt", FileMode.Create))
{
using (StreamWriter w = new StreamWriter(fs, Encoding.UTF8))
{
// Write a decimal, string, and char.
w.WriteLine(124.23M);
w.WriteLine("Test string");
w.WriteLine("A");
}
}

// Open the file in read-only mode.
using (FileStream fs = new FileStream("test.txt", FileMode.Open))
{
using (StreamReader r = new StreamReader(fs, Encoding.UTF8))
{
// Read the data and convert it to the appropriate data type.
Console.WriteLine(Decimal.Parse(r.ReadLine()));
Console.WriteLine(r.ReadLine());
Console.WriteLine(Char.Parse(r.ReadLine()));
}
}
}
}</source>
<pre class=codeResult>124.23
Test string
A</pre>

==Read one character at a time==

<source lang="csharp">using System;
using System.IO;
public class MainClass
{
static void Main(string[] args)
{
StreamReader MyStreamReader = new StreamReader(@"c:\Projects\Testing.txt");
for (int i = 0; i < 99; i++)
{
int ch = MyStreamReader.Read();
Console.WriteLine(ch);
}
MyStreamReader.Close();
}
}</source>

==StreamReader: ReadLine==

<source lang="csharp">using System;
using System.IO;
public class MainClass
{
static void Main(string[] args)
{
StreamReader MyStreamReader = new StreamReader(@"c:\Test.txt");
string str = MyStreamReader.ReadLine();
Console.WriteLine(str);
MyStreamReader.Close();
}
}</source>

==StreamReader: ReadToEnd()==

<source lang="csharp">using System;
using System.IO;
public class MainClass
{
static void Main(string[] args)
{
StreamReader MyStreamReader = new StreamReader(@"c:\Projects\Testing.txt");
string str = MyStreamReader.ReadToEnd();
Console.WriteLine(str);
MyStreamReader.Close();
}
}</source>

==Stream Read with StreamReader==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

class Program
{
static void Main(string[] args)
{
FileStream aFile = new FileStream("Log.txt", FileMode.Open);
StreamReader sr = new StreamReader(aFile);
string strLine = sr.ReadLine();

while (strLine != null)
{
Console.WriteLine(strLine);
strLine = sr.ReadLine();
}
sr.Close();
}
}</source>

==Use StreamReader to read a line from a text file==

<source lang="csharp">using System;
using System.IO;
class MainClass
{
public static void Main(string[] args)
{

string filename = "c:\\file.txt";

FileStream f = new FileStream(filename, FileMode.Open);
StreamReader stream = new StreamReader(f);

string line;
line = stream.ReadLine(); // header line
Console.WriteLine(line);

}
}</source>

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в 15:31, 26 мая 2010

Admin: 1 версия