I have a Queue<T> object that I have initialised to a capacity of 2, but obviously that is just the capacity and it keeps expanding as I add items. Is there already an object that automatically dequeues an item when the limit is reached, or is the best solution to create my own inherited class?...
So I've been poking around with C# a bit lately, and all the Generic Collections have me a little confused. Say I wanted to represent a data structure where the head of a tree was a key value pair, and then there is one optional list of key value pairs below that (but no more levels than these). Would this be suitable? public class Toke...
So WPF doesn't support standard sorting or filtering behavior for views of CompositeCollections, so what would be a best practice for solving tihs problem. There are two or more object collections of different types. You want to combine them into a single sortable and filterable collection (withing having to manually implement sort or ...
What is the best way to iterate through a strongly-typed generic List in C#.NET and VB.NET? ...
I have a Java list of integers, List<Integer> and I'd like to convert all the integer objects into strings, thus finishing up with a new List<String>. Naturally, I could create a new List and loop through and String.valueOf() all the integers, but I was wondering if there was a better (read: more automatic) way of doing it? [Minor edit...
I'd like some sorthand for this: Map rowToMap(row) { def rowMap = [:]; row.columns.each{ rowMap[it.name] = it.val } return rowMap; } given the way the GDK stuff is, I'd expect to be able to do something like: Map rowToMap(row) { row.columns.collectMap{ [it.name,it.val] } } but I haven't seen anything in the docs... ...
I've got a System.Generic.Collections.List(Of MyCustomClass) type object. Given integer varaibles pagesize and pagenumber, how can I collect only any single page of MyCustomClass objects? This is what I've got. How can I improve it? 'my given collection and paging parameters Dim AllOfMyCustomClassObjects As System.Collections.Generic...
Prior to C# generics, everyone would code collections for their business objects by creating a collection base that implemented IEnumerable IE: public class CollectionBase : IEnumerable and then would derive their Business Object collections from that. public class BusinessObjectCollection : CollectionBase Now with the generic lis...
I have two collections of the same object, Collection<Foo> oldSet and Collection<Foo> newSet. The required logic is as follow: if foo is in(*) oldSet but not newSet, call doRemove(foo) else if foo is not in oldSet but in newSet, call doAdd(foo) else if foo is in both collections but modified, call doUpdate(oldFoo, newFoo) else if !foo...
I am looking for a very fast way to filter down a collection in C#. I am currently using generic List<object> collections, but am open to using other structures if they perform better. Currently, I am just creating a new List<object> and looping thru the original list. If the filtering criteria matches, I put a copy into the new list....
In the vein of programming questions: suppose there's a collection of objects that can be compared to each other and sorted. What's the most efficient way to keep track of the smallest element in the collection as objects are added and the current smallest occasionally removed? ...
Is there anything built into the core C# libraries that can give me an immutable Dictionary? Something along the lines of Java's: Collections.unmodifiableMap(myMap); And just to clarify, I am not looking to stop the keys / values themselves from being changed, just the structure of the Dictionary. I want something that fails fast ...
I've inherited a large VB6 app at my current workplace. I'm kinda learning VB6 on the job and there are a number of problems I'm having. The major issue at the moment is I can't figure out how to check if a key exists in a Collection object. Can anyone help? ...
This free collection library comes from IT University of Copenhagen. http://www.itu.dk/research/c5/ There is a video with one of the authors on Channel 9. I am trying to learn how to use these collections and I was wondering whether anyone has more experiences or what are your thoughts on this specific collection library for .NET. Do y...
I need a quick algorithm to select a random 5 elements from a generic list. For example, I'd like to get a random 5 elements from a List. ...
Anyone have a good rule of thumb for choosing between different implementations of Java Collection interfaces like List, Map, or Set? For example, generally why or in what cases would I prefer to use a Vector or an ArrayList, a Hashtable or a HashMap? ...
I would like to compare two collections (in C#), but I'm not sure of the best way to implement this efficiently. I've read the other thread about Enumerable.SequenceEqual, but it's not exactly what I'm looking for. In my case, two collections would be equal if they both contain the same items (no matter the order). Example: collectio...
For example, if passed the following: a = [] How do I check to see if a is empty? ...
I have a class that map objects to objects, but unlike dictionary it maps them both ways. I am now trying to implement a custom IEnumerator interface that iterates through the values. public class Mapper<K,T> : IEnumerable<T>, IEnumerator<T> { C5.TreeDictionary<K,T> KToTMap = new TreeDictionary<K,T>(); C5.HashDictionary<T,K> TT...
I have an Asset object that has a property AssignedSoftware, which is a collection. I want to make sure that the same piece of Software is not assigned to an Asset more than once. In Add method I check to see if the Software already exist, and if it does, I want to throw an exception. Is there a standard .NET exception that I shoul...