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17 oct. 2011 · public abstract class Comparer<T> : IComparer, IComparer<T>. The new Comparer you create implements IComparer<T> and the non-generic IComparer, and can be used for comparisons and sorting of collections. You are correct: if your type, Customer implements IComparable, and you don't need another comparison, Comparer isn't useful to you.
14 août 2021 · To compare any two files and merge it to one file, here are the following steps you can follow if you have Visual Studio (any version) installed. Step 1: Open the Visual Studio command prompt. If you do not find the Visual Studio command prompt then choose Visual Studio tools. Start → Visual Studio command prompt.
15 janv. 2013 · I am trying to use an IComparer to sort a list of Points. Here is the IComparer class: public class CoordinatesBasedComparer : IComparer { public int Compare(Object q, Object r) { ...
IComparer<TKey> innerComparer = null) {. return new KeyComparer<TSource, TKey>(keySelector, innerComparer); } } You could then use this like so: var sortedSet = new SortedSet<MyClass>(KeyComparer.Create((MyClass o) => o.MyProperty)); You can refer to my blog post for an expanded discussion of this implementation.
2 déc. 2009 · Custom comparison is done by providing a comparer. If comparison is expensive, it might be slower than OrderBy() (which allow to use keys, see below). OrderBy/ThenBy() : Stable sort. Not in-place. Use Quicksort. Quicksort is not a stable sort. Here is the trick : when sorting, if two elements have equal key, it compares their initial order ...
2 avr. 2013 · This means that if you call the equals() method to compare 2 String objects, then as long as the actual sequence of characters is equal, both objects are considered equal. The == operator checks if the two strings are exactly the same object. The .equals() method check if the two strings have the same value.
26 janv. 2016 · When implementing interfaces of classes it is important to read the documentation, to know which contract you’re supposed to implement. 1. In your code, the solution is to forward GetHashCode to Class_reglement.Numf.GetHashCode and implement it appropriately there. Apart from that, your Equals method is full of unnecessary code.
2 févr. 2011 · 11. Well, one option is to create something like ProjectionComparer instead. I've got a version of that in MiscUtil - it basically creates an IComparer<T> from a projection. So your example would be: int index = Array.BinarySearch(widgets, x, ProjectionComparer<Widget>.Create(x => x.foo));
The equality comparer argument must be an instance of IEqualityComparer<T>. I can do this, of course, but it's somewhat verbose and, well, cludgy. What I would have expected is an overload that would take a lambda, say a Func<T, T, bool>: var distinctValues = myCustomerList.Distinct((c1, c2) => c1.CustomerId == c2.CustomerId);
17 nov. 2011 · I prefer to use objcopy to convert to hex, then use diff. Useful answer. The output file size is about 3 times as big as the input file. This command will convert a binary file to hex. objcopy -I binary -O ihex <in_file> <out_file>. In Cygwin: diffs binary offsets and values are in decimal and octal respectively..
