Help me for this
Can you give me a real time example of Lists & Dictionary in c# ??
Think of the List as an array and the Dictionary as a hash table. You would only use the Dictionary if you needed to map (or associate) meaningful keys to values, whereas a List only
maps (or associates) positions (or indices) to values.
For example, say you wanted to store an association between a person's age and their height. You could use a Dictionary<int, int> to map the person's age (an int) to their height (an int):
Dictionary<int, int> personHeightMap = new Dictionary<int, int>();
personHeightMap.Add(21, 185);
personHeightMap.Add(31, 174);
int height = personHeightMap.ContainsKey(21) ? personHeightMap[21] : -1;
Not a very useful example, but the point is you wouldn't be able to do this as elegantly with a List because it would need to store these values positionally.
Also refer: C# Dictionary Versus List
Rachit
Please mark as answer or vote as helpful if my reply does
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Hi
I attached here jpg which will show you there 3 table A , b And c
And i needed know how i can make Function or any thing else for know which i add into cell question mark
Pls look into this attached and advise me
Take your time
http://imageshack.us/f/853/examplees.jpg/
Edited by: 964035 on Oct 9, 2012 1:09 AM
Edited by: 964035 on Oct 9, 2012 2:26 AMBelow the cods for create the table and insert some data as example
I needed know how i can Booking The item from stock for each order and how i can know the status of item it's will be available or not so we should do the order purchase for item
Create Table Color (
Order Number(5) Not Null ,
Color Varchar2(8) Not Null ,
Qty Number (8) Not Null )
Create Table Recipe (
Color Varchar2(8) Not Null ,
Item Varchar2(8) Not Null ,
Recipe Number (8) Not Null )
Create Table Stock (
Item Varchar2(8) Not Null Constraint Item_PK PRIMARY KEY,
Qty_Of_Stock Number (8) Not Null )
Insert into Color VALUES ( 1500 , Red' ,10);
Insert into Color VALUES ( 1500 , yellow' ,15);
Insert into Color VALUES ( 1500 , Green' ,8);
Insert into Color VALUES ( 1500 , Blue' ,7);
Insert into Color VALUES ( 1600 , yellow' ,6);
Insert into Color VALUES ( 1600 , Green' ,7);
Insert into Color VALUES ( 1600 , Blue' ,8);
Insert into Color VALUES ( 1700 , Red' ,10);
Insert into Color VALUES ( 1700 , Blue' ,15);
Insert into Color VALUES ( 1800 , Green' ,16);
Insert into Color VALUES ( 1800 , yellow' ,9);
Insert into Recipe VALUES ( 'Red','A',0.25);
Insert into Recipe VALUES ( 'Red','B',0.3);
Insert into Recipe VALUES ( 'Red','C',0.2);
Insert into Recipe VALUES ( 'Red','D',0.25);
Insert into Recipe VALUES ( 'Yellow','C',0.1);
Insert into Recipe VALUES ( 'Yellow','D',0.3);
Insert into Recipe VALUES ( 'Yellow','E',0.2);
Insert into Recipe VALUES ( 'Yellow','F',0.4);
Insert into Recipe VALUES ( 'Green','C',0.25);
Insert into Recipe VALUES ( 'Green','D',0.35);
Insert into Recipe VALUES ( 'Green','E',0.2);
Insert into Recipe VALUES ( 'Green','G','0.1);
Insert into Recipe VALUES ( 'Green','H',0.1);
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Insert into Stock VALUES ( 'D',30);
Insert into Stock VALUES ( 'E',20);
Insert into Stock VALUES ( 'F',10);
Insert into Stock VALUES ( 'H',25);
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