Technology

C# implicit operator

Aug 20th

Posted by SAJJAD in C#

No comments

public class StringSafe
{
	/// < summary>
	/// Empty value
	/// < /summary>
	public const string Empty = "";

	/// < summary>
	/// String to StringSafe
	/// < /summary>
	/// < param name="data">object< /param>
	/// < returns>< /returns>
	public static implicit operator StringSafe(String data)
	{
		if (data == null)
			return Empty;

		return new StringSafe(data);
	}

	/// < summary>
	/// StringSafe to String
	/// < /summary>
	/// < param name="data">object< /param>
	/// < returns>< /returns>
	public static implicit operator String(StringSafe data)
	{
		if (data == null)
			return Empty;

		return data.value;
	}

	private String value = Empty;
	/// < summary>
	/// Value
	/// < /summary>
	public String Value
	{
		get
		{
			if (this.value == null)
			return Empty;

			return this.value;
		}
		set
		{
			if (value == null)
			this.value = Empty;
			else
			this.value = value;
		}
	}

	/// < summary>
	/// Create new instance of StringSafe
	/// < /summary>
	/// < param name="value">< /param>
	public StringSafe(String value = Empty)
	{
		this.value = value;
	}
}

Sample

public class Program
{
	StringSafe sf = "SAJJAD";
	MessageBox.Show(sf);
}

Anonymous Struct

Aug 18th

Posted by SAJJAD in C#

No comments

var Freinds = new[]
{
	new { Name = "Ali", Age = 23 , Married = false },
	new { Name = "Reza", Age = 43  , Married = true },
	new { Name = "Ehsan", Age = 36 , Married = true },
	new { Name = "Mahdi", Age = 34 , Married = false }
};

String Output = String.Empty;

foreach (var v in Freinds.Where(a => a.Married))
	Output += "Name: " + v.Name + ", Age:" + v.Age + ";";

if (Output.Length > 0)
	MessageBox.Show(Output.Substring(0, Output.Length - 1));

Recursive calculation with LinQ

Sep 19th

Posted by SAJJAD in C#

No comments

delegate int IntToInt(int i);
static IntToInt Factorial = (n) => n <= 1 ? 1 : n * Factorial(n - 1);
,

List in C#

Sep 16th

Posted by SAJJAD in C#

No comments

List< String> strs = new List< String>();

// Add
strs.Add("Aa");
strs.Add("Ba");
strs.Add("Ca");
strs.AddRange(new string[] { "Ab", "Bb", "Cb" });

// Work
strs[0] // Aa
strs.Find(a=>a.StartsWith("A")) // First found in list by Indexing is "Aa"
strs.FindAll(a=>a.StartsWith("A")) // Aa, Ab
strs.Where(a=>a.Contain("A")).ToList(); // Aa, Ba, Ca, Aa

// Remove
strs.RemoveAt(0); // By Index
strs.Remove("Aa"); // By Value
strs.RemoveAll(a=>a.StartsWith("A") && EndsWith("a")); // By Query

LinQ & XML

Sep 16th

Posted by SAJJAD in C#

No comments

XDocument xFile = new XDocument(
	new XElement("application",
		new XAttribute("appName", Application.ProductName),
		new XAttribute("appVersion", Application.ProductVersion),

		new XElement("movies",
			new XAttribute("AttrA", false),
			new XAttribute("AttrB", 1000)),

			new XElement("movie",
				new XAttribute("name", "A"),
				new XAttribute("size", "800x600"),
				new XAttribute("url", "http://film.com/a.avi")
			),
			new XElement("movie",
				new XAttribute("name", "B"),
				new XAttribute("size", "640x480"),
				new XAttribute("url", "http://film.com/b.avi")
			)
		)
	);

xFile.Save("FileName.xml");
, ,

LinQ in XML

Sep 16th

Posted by SAJJAD in C#

No comments

List< XElement> xs = XDocument
.Load("http://api.themoviedb.org/2.1/Movie.imdbLookup/en/xml/aba51da40c1f8931aab66cd91178a970/tt0137523")
.Element("OpenSearchDescription")
.Element("movies")
.Element("movie")
.Element("images")
.Elements()
.ToList();

xs
.ForEach(
	a =>
	{
		if(a.Attribute("size").value == "poster" && (a.Attribute("type").Value.ToLower() == "poster" || a.Attribute("type").Value.ToLower() == "backdrop"))
		{
			// Code Here: a.Attribute("url").value
		}
	}
);

xs
.FindAll((a.Attribute("type").Value.ToLower() == "poster" || a.Attribute("type").Value.ToLower() == "backdrop") && a.Attribute("size").value == "poster"))
.ForEach(
	a =>
	{
		// Code Here: a.Attribute("url").value
	}
);