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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How to cancel a parallel task

a) THREAD A:  The method for the starting of the parallel task instantiates a new System.Threading.CancellationTokenSource Object

b) THREAD A: This CancellationTokenSource is given to the parallel task

c) THREAD B: The underlying method of the parallel task includes the type of CancellationTokenSource in its signature to take it over.


If a "cancel" button was pushed in THREAD A, then CancellationTokens method Cancel must be raised. This is done like this:
CancellationTokenSource.Token.Cancel();

The routine inside THREAD B (expecting while...wend loop for instance) is checking the CancellationTokenSource.Token.IsCancellationRequested = true
state and aborts its work in this case.

done!

based information : http://msdn.microsoft.com/de-de/library/dd997364%28v=vs.110%29.aspx

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