IDictionary get(string ticker, string type, DateTime from, DateTime To);

Question

IDictionary DateTime , Double > get( string ticker, string type, DateTime from, DateTime To); Can anyone explain what the above function does and what Idictionary is for?

Liutauras Medziunas · Answer

Normal 0 19 false false false LT X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} Dictionary is a collection with key and value. The function get(string ticker, string type, DateTime from, DateTime To) just gets a dictionary with double values mapped with date time; IDictionary it is an interface. You could use it if you want to create dictionary by yourself with specific logic in it. What you should to do is just inherit IDictionary and do like in my sample. In this sample you see the implementation and you can use it when you exactly know your key and value object types. The Entry class is like a mapper to map your key with assigned value. Don't use this sample in real it just for your understanding. And you should read the article in msdn: http://msdn.microsoft.com/en-us/library/s4ys34ea.aspx from Suthish Nair for better understanding. public class SmallDictionary : IDictionary DateTime , Double > { private class Entry { public DateTime Key { set ; get ; } public Double Value { set ; get ; } public Entry ( DateTime key , Double value ) { this . Key = key ; this . Value = value ; } } private List Entry > entries = new List Entry >(); public void Add ( DateTime key , double value ) { entries . Add ( new Entry ( key , value )); } public double this [ DateTime key ] { get { double result = 0 ; Entry entry = FindEntry ( key ); if ( entry != null ) { result = entry . Value ; } else { throw new IndexOutOfRangeException ( "Key not found!" ); } return result ; } set { Entry entry = FindEntry ( key ); entry . Value = value ; } } private Entry FindEntry ( DateTime key ) { Entry resultEntry = null ; foreach ( var entiry in entries ) { if ( entiry . Key == key ) { resultEntry = entiry ; break ; } } return resultEntry ; } // additional implementation goes here .................... } public static void Main() { SmallDictionary myDictionary = new SmallDictionary (); DateTime firstValueChangeDateTime = DateTime .Today; DateTime secondValueChangeDateTime = firstValueChangeDateTime.AddHours(1); // You can add items to to dictionary myDictionary.Add(firstValueChangeDateTime, 50); myDictionary.Add(secondValueChangeDateTime, 60); // You can get items from dictionary Console .WriteLine( "Second: {0}" , myDictionary[secondValueChangeDateTime]); Console .WriteLine( "First: {0}" , myDictionary[firstValueChangeDateTime]); // You can cange value by key myDictionary[secondValueChangeDateTime] = 500; myDictionary[firstValueChangeDateTime] = 800; // You can get items from dictionary Console .WriteLine( "Second: {0}" , myDictionary[secondValueChangeDateTime]); Console .WriteLine( "First: {0}" , myDictionary[firstValueChangeDateTime]); try { Console .WriteLine( "First: {0}" , myDictionary[ DateTime .Now]); } catch ( Exception exc) { Console .WriteLine(exc); } Console .ReadKey(); }

Liutauras Medziunas · Answer

Yes you are right!

Tommy Sin · Answer

Yes, it is a method in the interface. IDictionary DateTime , Double > get( string ticker, string type, DateTime from, DateTime To); In this case, is " IDictionary DateTime , Double > " return type of the method? Thanks

Liutauras Medziunas · Answer

Please post more details (more source code). Probably IDictionary get(string ticker, string type, DateTime from, DateTime To); is a method of interface.

Tommy Sin · Answer

Hello, I understoond your code clearly. However, what is the point of inheriting "IDictionary " in the following sentence? public class SmallDictionary : IDictionary DateTime , Double > It seems that it works fine without the inheritance of the IDictionary interface. Likewise, what is "get(string ticker, string type, DataTime from, DateTime To);" for in the following sentence and how it works? (The example you provided is not like the following format) IDictionary DateTime , Double > get( string ticker, string type, DateTime from, DateTime To); Thanks

Suthish Nair · Answer

msdn: http://msdn.microsoft.com/en-us/library/s4ys34ea.aspx

IDictionary get(string ticker, string type, DateTime from, DateTime To);

Answers (6)