Can someone explain what the heck is this? very weird

Question

C#

Hadrian

Can someone explain what the heck is this? very weird

sort
sportList.Sort((a, b) => { return a.Result - b.Result; });

0

11.12.2021

5 ответов

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Ray Golden

using System; using System.Collections.Generic; // Simple business object. A PartId is used to identify the type of part // but the part name can change. public class Part : IEquatable<Part> , IComparable<Part> { public string PartName { get; set; } public int PartId { get; set; } public override string ToString() { return "ID: " + PartId + " Name: " + PartName; } public override bool Equals(object obj) { if (obj == null) return false; Part objAsPart = obj as Part; if (objAsPart == null) return false; else return Equals(objAsPart); } public int SortByNameAscending(string name1, string name2) { return name1.CompareTo(name2); } // Default comparer for Part type. public int CompareTo(Part comparePart) { // A null value means that this object is greater. if (comparePart == null) return 1; else return this.PartId.CompareTo(comparePart.PartId); } public override int GetHashCode() { return PartId; } public bool Equals(Part other) { if (other == null) return false; return (this.PartId.Equals(other.PartId)); } // Should also override == and != operators. } public class Example { public static void Main() { // Create a list of parts. List<Part> parts = new List<Part>(); // Add parts to the list. parts.Add(new Part() { PartName = "regular seat", PartId = 1434 }); parts.Add(new Part() { PartName= "crank arm", PartId = 1234 }); parts.Add(new Part() { PartName = "shift lever", PartId = 1634 }); ; // Name intentionally left null. parts.Add(new Part() { PartId = 1334 }); parts.Add(new Part() { PartName = "banana seat", PartId = 1444 }); parts.Add(new Part() { PartName = "cassette", PartId = 1534 }); // Write out the parts in the list. This will call the overridden // ToString method in the Part class. Console.WriteLine("\nBefore sort:"); foreach (Part aPart in parts) { Console.WriteLine(aPart); } // Call Sort on the list. This will use the // default comparer, which is the Compare method // implemented on Part. parts.Sort(); Console.WriteLine("\nAfter sort by part number:"); foreach (Part aPart in parts) { Console.WriteLine(aPart); } // This shows calling the Sort(Comparison(T) overload using // an anonymous method for the Comparison delegate. // This method treats null as the lesser of two values. parts.Sort(delegate(Part x, Part y) { if (x.PartName == null && y.PartName == null) return 0; else if (x.PartName == null) return -1; else if (y.PartName == null) return 1; else return x.PartName.CompareTo(y.PartName); }); Console.WriteLine("\nAfter sort by name:"); foreach (Part aPart in parts) { Console.WriteLine(aPart); } /* Before sort: ID: 1434 Name: regular seat ID: 1234 Name: crank arm ID: 1634 Name: shift lever ID: 1334 Name: ID: 1444 Name: banana seat ID: 1534 Name: cassette After sort by part number: ID: 1234 Name: crank arm ID: 1334 Name: ID: 1434 Name: regular seat ID: 1444 Name: banana seat ID: 1534 Name: cassette ID: 1634 Name: shift lever After sort by name: ID: 1334 Name: ID: 1444 Name: banana seat ID: 1534 Name: cassette ID: 1234 Name: crank arm ID: 1434 Name: regular seat ID: 1634 Name: shift lever */ } }

0

12.12.2021

Wizou

Ray Golden
using System; using System.Collections.Generic; //...

Don't post big chunks of code like this. Either use pastebin or something, or attach it as a document. I will remove this post soon

0

12.12.2021

Ray Golden

Wizou
Don't post big chunks of code like this. Either us...

Can u show me how to post code plz

0

12.12.2021

Martin Rys

Ray Golden
Can u show me how to post code plz

Read the rules

0

12.12.2021

Wizou · Accepted Answer

Wizou

standard sort... just providing an elements comparison callback that determine whether a is greater, equal, or lesser than b (callback result must be > 0, = 0 or < 0)

0

11.12.2021

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Can someone explain what the heck is this? very weird

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