в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:16:10Z

1 версия

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==Adding extension method for int==

<source lang="csharp">using System;
using System.Text;
using System.Reflection;
using System.Runtime.rupilerServices;
public static class MyExtensions
{
public static void DisplayDefiningAssembly(this object obj)
{
Console.WriteLine(obj.GetType().Name);
Console.WriteLine(Assembly.GetAssembly(obj.GetType()));
}
public static int ReverseDigits(this int i)
{
char[] digits = i.ToString().ToCharArray();
Array.Reverse(digits);
string newDigits = new string(digits);
return int.Parse(newDigits);
}
}
class Program
{
static void Main(string[] args)
{
int myInt = 987;
myInt.DisplayDefiningAssembly();
Console.WriteLine("{0} is reversed to {1}", myInt, myInt.ReverseDigits());
Console.ReadLine();
}
}</source>

==Adding extension to Stream==

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

public static class StreamUtilWithExtensions
{
const int BufferSize = 8192;
public static void CopyTo(this Stream input,Stream output)
{
byte[] buffer = new byte[BufferSize];
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, read);
}
}
public static byte[] ReadFully(this Stream input)
{
using (MemoryStream tempStream = new MemoryStream())
{
CopyTo(input, tempStream);
if (tempStream.Length == tempStream.GetBuffer().Length)
{
return tempStream.GetBuffer();
}
return tempStream.ToArray();
}
}
}

class MainClass
{
static void Main()
{
WebRequest request = WebRequest.Create("http://nfex.ru");
using (WebResponse response = request.GetResponse())
using (Stream responseStream = response.GetResponseStream())
using (FileStream output = File.Create("data.dat"))
{
responseStream.CopyTo(output);
}
}
}</source>

==Adding reverse operation to string==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public static class ExtensionLibExtensions
{
public static string ReverseString(this string inputString)
{
return new string(inputString.ToCharArray().Reverse().ToArray());
}
}
class Program
{
static void Main(string[] args)
{
string sourceString = "this is a test";
Console.WriteLine("String backwards: {0}", sourceString.ReverseString());
}
}</source>

==Add title case to string class==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public static class ExtensionLibExtensions
{
public static string ToTitleCase(this string inputString, bool forceLower)
{
inputString = inputString.Trim();
if (inputString == "")
{
return "";
}
if (forceLower)
{
inputString = inputString.ToLower();
}
string[] inputStringAsArray = inputString.Split(" ");
StringBuilder sb = new StringBuilder();
for (int i = 0; i < inputStringAsArray.Length; i++)
{
if (inputStringAsArray[i].Length > 0)
{
sb.AppendFormat("{0}{1} ",
inputStringAsArray[i].Substring(0, 1).ToUpper(),
inputStringAsArray[i].Substring(1));
}
}
return sb.ToString(0, sb.Length - 1);
}
}
class Program
{
static void Main(string[] args)
{
string sourceString = "this is a test";
Console.WriteLine("String with title casing: {0}", sourceString.ToTitleCase(true));
}
}</source>

==conflicting extension methods==

<source lang="csharp">using System;
public static class ExtensionMethods
{
public static string Substring(this string s, int startIndex, int endIndex)
{
if (startIndex >= 0 && startIndex <= endIndex && endIndex < s.Length)
return s.Substring(startIndex, endIndex - startIndex);
else
return s;
}
}
public class Tester{
public static void Main()
{
string hello = "Hello";
Console.WriteLine("hello.Substring(2, 3) = {0}", hello.Substring(2, 3));
}
}</source>

==extension method==

<source lang="csharp">using System;
public static class ExtensionMethods
{
public static string Right(this string s, int n)
{
if (n < 0 || n > s.Length)
return s;
else
return s.Substring(s.Length - n);
}
}
public class Tester
{
public static void Main()
{
string hello = "Hello";
Console.WriteLine("hello.Right(-1) = {0}", hello.Right(-1));
Console.WriteLine("hello.Right(0) = {0}", hello.Right(0));
}
}</source>

==Extension Method On Null Reference==

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

static class NullUtil
{
public static bool IsNull(this object x)
{
return x == null;
}
}
class MainClass
{
static void Main()
{
object y = null;
Console.WriteLine(y.IsNull());
y = new object();
Console.WriteLine(y.IsNull());
}
}</source>

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Csharp/CSharp Tutorial/Class/Extension - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия