Linq : short basic samples

Linq - basic how to samples:

using System.Linq;

...

[System.Serializable]
public class Item
{
public string Name;
public int ItemID;
public int Buff;
}

public class Main
{

public List<Item> Items;

public void Start()
{

string[] names = { "ralf", "Peter", "Thomas", "Christian", "Patrice" };

/* ANY demo */
var nameFound = names.Any(name => name == "Peter");
Debug.Log("Found name : " + nameFound);

/* Contains */
var nameContained = names.Contains("Christian");
Debug.Log("Found conatined : " + nameContained);

/* Distinct - remove duplicates*/
var uniqueNames = names.Distinct();

/* Where */
var result = names.Where(n => n.Length > 5);

/* select greater than results */
int[] grades = { 10, 20, 30, 40, 50, 60, 65, 70, 75, 33, 80, 13, 90, 100 };
var highGrades = grades.Where(i => i > 65);
foreach (int grade in highGrades)
{
Debug.Log("selected grade : " + grade.ToString());
}

/* select ORDER BY .. DESCENDING  */
var descGrades = grades.OrderByDescending(i => i);
foreach (var item in descGrades)
{
Debug.Log("Int item = " + item);
}

/* precondition before moving on - image the Items collection including 5x Item with various values */

/* check if ItemID 3 exists in the List of Item */
var containsId3 = Items.Where(i => i.ItemID == 3);
var itemId3found = Items.Any(i=>i.ItemID == 3);
Debug.Log("is Items including ItemId 3 : " + itemId3found);

/* select all items with buff greater then 60 and print them out */
var itemsGT60 = Items.Where(i => i.Buff > 60);
foreach (var buff in itemsGT60)
{
Debug.Log("buff Items > 60 : " + buff);
}

/* calculate the average of all the buff stats */
var resultAverage = Items.Average(i => i.Buff);
Debug.Log("Average : " + resultAverage);
}

}

...

// find the entry in an array of objects where each object got the property 'Name'

using System;

string searchForName = "Patrice"

var foundItem = Array.Find(CollectionOfItems, x=> x.Name==searchForName);

json - newtowsoft - JArray - SelectToken

how to fill JArray and select all and specific items? 

private Newtonsoft.Json.Linq.JArray UFOS = new jsonlib.Linq.JArray();

dynamic json = Newtonsoft.Json.JsonConvert.DeserializeObject(myUFOjsonSourceString);

var list = json.list; // List of UFO items - 'list' is the root element of the source JSON structure

foreach (var item in list)
{
..
UFOS.Add(item);
...
}

IEnumerable<jsonlib.Linq.JToken> allUFOS= UFOS.SelectToken("$"); // okay, all UFOs

IEnumerable<jsonlib.Linq.JToken> oneUFO = UFOS.SelectToken("$[?(@.Pilot=='E.T.')]"); // okay, if each item of UFO would contain the property 'Pilot', select the one where Pilot=E.T. (you know, this small odd alien who wants to get home again)

Sample II:

Parse XML using Newtonsoft.Json

<root>
  <light>
    <color>red</color>
    <intensity>bright</intensity>
  </light>
  <light>
    <color>green</color>
    <intensity>light</intensity>
  </light>
</root>

XDocument doc = XDocument.Parse(mySampleXmlString); //or XDocument.Load(path)
string jsonText = JsonConvert.SerializeXNode(doc);
dynamic pseudoXml = JsonConvert.DeserializeObject(jsonText);
Newtonsoft.Json.Linq.JArray lights = (Newtonsoft.Json.Linq.JArray)pseudoXml["root"]["light"];
foreach (var light in lights)
{
    string color = (string)light.color;
    string intensity = (string)light.intensity;
}

Pass string parameter plus optional placeholder fill up arguments to a method - method signature for String.Format(..)

how to setup a method getting args to be applied using String.Format(....)?

Example:

        private void log(object text, params object[] param)
        {
            string line;
            if (param != null && param.Length > 0)
                line = String.Format(text.ToString(), param);
            else
                line = text.ToString();
            if (Environment.UserInteractive==true)
                Console.WriteLine(line);
        }

text to enum value

classic request how to convert a text entry to an enum value? See..

Colors orange = (Colors) Enum.Parse(typeof(Colors), "Red, Yellow");

how to get the current assembly version

            var assembly = Assembly.GetExecutingAssembly();
            string version = assembly.GetName().Version.ToString();

how to avoid multiple executions of a program

Define any unique ID / UID like 'a2c204cc-50a1-4fde-b47f-5b712821edf3' . If this UID isn't free, abort the application. Otherwise block it with the current process.

prepare application

public static System.Threading.Mutex mutex;
public static bool createdNewMutex;

startup application

mutex = new System.Threading.Mutex(true, "a2c204cc-50a1-4fde-b47f-5b712821edf3", out createdNewMutex);
if (!createdNewMutex) base.Shutdown(0);

final exit of the application:

if (App.createdNewMutex) App.mutex.ReleaseMutex();

String to Double value conversion

In different cultures differs the decimal delimiter. Therfore you could profit by such an extension method like this one. So it doesn't matter if you are using a english or german client, when converting for instance "4711.10" or "4711,10" to a double value.

        //english/Invariant system . = decimal delimiter
        //DE, NL system            , = decimal delimiter
        public static double ToDoubleEx<T>(this T obj)
        {
            if (obj == null) return 0;
            double result = 0;
            string v = Convert.ToString(obj);
            if (v != null && v.Length > 0)
            {
                var point = v.IndexOf('.');
                var komma = v.IndexOf(',');
                if (point != -1 && komma != -1)
                {
                    if (komma > point)
                        v = v.Replace(".", "");
                    else
                        v = v.Replace(",", "");
                }
                v = v.Replace(",", ".");
                result = Double.Parse(v, System.Globalization.CultureInfo.InvariantCulture); //Invariant behavior like english default behavior
            }
            return result;
        }

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