IComparer is an interface provided by the .NET framework, used in conjunction with the Array.Sort and Array.BinarySearch methods. It provides a way to customize the sort order of a collection. It contains a single Compare method that compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other. There is also a generic version of this interface. Supported in .NET 4, 3.5, 3.0, 2.0, 1.1, 1.0. Source: MSDN
Questions tagged [icomparer]
228 questions
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C# - custom IComparer that takes an argument as input
I have a list of Points (x,y) that I want to sort by their polar angle with respect to a reference point which I calculate as the average point of all points in the list.
How can I set up IComparer so that I can pass the reference point to it for…
Adrian Pfeifle
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Error on an Icomparer Implementation. Please help !
I created an array sorter to sort arrays like in Win Explorer in a DNN module. As in the answer to a preview question:
Sorting an array of folder names like Windows Explorer (Numerically and Alphabetically) - VB.NET
A user is getting the following…
Norman
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Sort List by reference
I would like to sort a List by reference. Why? I want to compare several lists and find which elements are unique to a given list. Sorting them first in some canonical fashion and then stepping through all lists simultaneously seems a good way to…
Little Endian
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Can I compare objects of different types using NUnit's EqualTo().Using()?
I want to be able to compare any two things that are IConvertible to DateTime using NUnit's Assert.That, preferably without creating a custom constraint. I have a simple IComparer that does the trick nicely. It works with EqualTo().Using(), so long…
Paul Hicks
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Sorting a list of equal objects with IComparer changes the item ordering
I ran into a problem with IComparer and System.Collections.Generic.List when all items are considered equal:
If all items in the source list are considered equal, I would expect the "sorted" list to have exactly the same item order than the source…
Mark
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Testing a generic IComparer
I'm trying to do a generic comparer and I'm not sure what is going wrong.
The comparer's code:
namespace Pract_02
{
public class ComparerProperty : IComparer
{
private String attribute;
public ComparerProperty(String…
Juan Lopez
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ListView.Sort() not working correctly with IComparer C#
Within my code, I have a ListView called allocations which stores the location name and the picking priority as its columns. At the moment, it looks something like this:-
| Location | Picking Priority …
Chris Graves
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C# custom sort by distance from a point
I am trying to sort a list using IComparer there are about 20,000 items in my list. The first approximately 100 and last 100 items are sorted but the center is not. I am not sure what I am doing wrong. Attached is the parts of the code that does…
kgsw
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Can't remove object from SortedDictionary C#
I have a node class which is contained in a SortedDictionary:
SortedDictionary openList = new SortedDictionary();
I need to write the CompareTo method on the node, so that the nodes are sorted from lowest to highest based on…
Karstan
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Extend object used in WCF service by caller
The WCF web service I'm calling only returns an array of a specific object and IComparer apparently has not been implemented. This makes sorting a little more difficult than I think it should be so I'm wondering if there's a way I can fix that. Is…
NealR
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Define ICompare (Comparator) in Array.Sort Parameter as in (Java)
How can i convert this java style code into C# ? Here is what i have tried already :
I changed the method name from comparable(java) to icompare(c#).
Array.Sort(valobject, new IComparer(){
public int Compare(Object obj1, Object obj2)…
Undisputed007
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Sorting a SortedDictionary by key length in Visual Basic?
I'm writing a script that anonymizes participant data from a file.
Basically, I have:
A folder of plaintext participant data (sometimes CSV, sometimes XML, sometimes TXT)
A file of known usernames and accompanying anonymous IDs (e.g. jsmith1 as a…
David
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Sort List with duplicate keys by custom comparer
I have the List inputColl of type MyValue with many duplicate keys:
myValue1.Id=100;
myValue2.Id=100;
...etc
And I have custom comparer to compare two MyValue elements by Id:
inputColl.Sort(myValueComparer);
What am I doing wrong?
Comparer:
public…
Admiral Land
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Generic Comparer for all objects with a Text property
I am trying to implement a generic comparer (for a sort) for all objects that have a Text property... so two ASP.net textboxes can be compared, two labels or in this specific case two RadTreeNodes in a telerik RadTreeView (as long as they have a…
Craig
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Sorting ListCollectionView with CustomSort
I'm trying to sort a ListCollectionView but I can't get it to work. I have my own CustomSort which throws the following error:
Cannot implicitly convert type 'SceneComparer' to 'IComparer'. An
explicit conversion exists. (Are you missing a…
Phil
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