我在根据特定条件对某些对象进行排序时遇到问题。我已经搜索过，但似乎没有人按照我的方式这样做，或者我的情况很独特，或者我做错了。我正在尝试通过 C# 对 visual studio 中的一些对象进行排序。我有几个动物类和一个动物园类(界面)以及一个分类类。在我的主课中，我列出了以下内容并尝试对我制作的动物列表进行排序:
class Program
{
static void Main(string[] args)
{
Lion aLion = new Lion("Leo", DateTime.Parse("4/04/2012"),
2500, 360, 0, 9);
Giraffe aGiraffe = new Giraffe("Amber", DateTime.Parse("3/23/2013"),
4500, 1400, 0, 25);
Giraffe aSecondGiraffe = new Giraffe("Charlie", DateTime.Parse("5/2/2012"),
3600, 2600, 0, 25);
Giraffe aThirdGiraffe = new Giraffe("George", DateTime.Parse("5/22/2013"),
3000, 3200, 0, 3);
Lion aThirdLion = new Lion("Charlie", DateTime.Parse("1/10/2011"),
1000, 6, 0, 27);
Lion aSecondLion = new Lion("Bernie", DateTime.Parse("1/30/2012"),
1200, 8, 0, 27);
Lion aFourthLion = new Lion("Billy", DateTime.Parse("12/12/2012"),
5000, 350, 0, 20);
Lion aFifthLion = new Lion("Jake", DateTime.Parse("10/15/2015"),
10000, 400, 0, 20);
Giraffe aFifthGiraffe = new Giraffe("Mike", DateTime.Parse("5/2/2016"),
8000, 620, 0, 10);
Giraffe aFourthGiraffe = new Giraffe("Joe", DateTime.Parse("5/17/2014"),
8500, 645, 0, 10);
List<IZoo> aZoo = new System.Collections.Generic.List<IZoo>();
aZoo.Add(aLion);
aZoo.Add(aGiraffe);
aZoo.Add(aSecondGiraffe);
aZoo.Add(aThirdGiraffe);
aZoo.Add(aThirdLion);
aZoo.Add(aSecondLion);
aZoo.Add(aFourthLion);
aZoo.Add(aFifthLion);
aZoo.Add(aFifthGiraffe);
aZoo.Add(aFourthGiraffe);
string fileSpec = "LogData.txt";
StreamWriter output = File.CreateText(fileSpec);
var sortByPurchaseCost = new Class1.sortPurchaseCostAscendingHelper();
aZoo.Sort(sortByPurchaseCost);
Console.WriteLine(PrintReportHeader());
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
Console.WriteLine(" ");
var sortBysortWeightAndDOB = new Class1.sortWeightAndDOBHelper();
aZoo.Sort(sortBysortWeightAndDOB);
Console.WriteLine(PrintReportHeader());
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
Console.WriteLine(" ");
var sortCagePurchaseCostAnimalNameID = new Class1.sortCagePurchaseCostAnimalNameIDHelper();
aZoo.Sort(sortCagePurchaseCostAnimalNameID);
Console.WriteLine(PrintReportHeader());
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
Console.WriteLine(" ");
var sortAgeWeight = new Class1.sortAgeWeightHelper();
aZoo.Sort(sortAgeWeight);
Console.WriteLine(PrintReportHeader());
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
Console.WriteLine(" ");
var sortTypePCCageName = new Class1.sortTypePCCageNameHelper();
aZoo.Sort(sortTypePCCageName);
Console.WriteLine(PrintReportHeader());
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
output.Close();
Console.WriteLine("\nPress <ENTER> to quit...");
Console.ReadKey();
}
public static string PrintReportHeader()
{
return $"{"ID",-7} {"Animal Type",-15} {"Name",-15} {"Weight",-8}" +
$"{"Age",-5} {"Purchase Cost",-16} {"Cage No.",-10}\n" +
$"{"==",-7} {"===========",-15} {"====",-15} {"======",-8}" +
$"{"===",-5} {"=============",-16} {"========",-10}"; }
在我的排序类中，我有以下内容:
public class sortPurchaseCostAscendingHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.PurchaseCost > z2.PurchaseCost)
return 1;
if (z1.PurchaseCost < z2.PurchaseCost)
return -1;
else
return 0;
}
}
public class sortWeightAndDOBHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.Weight > z2.Weight && z1.DOB > z2.DOB)
return 1;
if (z1.Weight < z2.Weight && z1.DOB < z2.DOB)
return -1;
else
return 0;
}
public static implicit operator sortWeightAndDOBHelper(sortAgeWeightHelper v)
{
throw new NotImplementedException();
}
}
public class sortCagePurchaseCostAnimalNameIDHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.CageNumber > z2.CageNumber && z1.PurchaseCost > z2.PurchaseCost && z1.Name > z2.Name && z1.ID > z2.ID)
return 1;
if (z1.Weight < z2.Weight && z1.DOB < z2.DOB)
return -1;
else
return 0;
}
}
public class sortAgeWeightHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.DOB > z2.DOB && z1.Weight > z2.Weight)
return 1;
if (z1.DOB < z2.DOB && z1.Weight < z2.Weight)
return -1;
else
return 0;
}
}
public class sortTypePCCageNameHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.PurchaseCost > z2.PurchaseCost && z1.CageNumber > z2.CageNumber)
return 1;
if (z1.PurchaseCost < z2.PurchaseCost && z1.CageNumber < z2.CageNumber)
return -1;
else
return 0;
}
}
}
每个 Icomparer 都需要对五个 FOREACH 部分进行不同的排序。我在尝试将这些 Icomparer 链接到我的主要 FOREACH 列表以便进行排序时遇到问题。如果有人对我有想法或者可能有更好的方法来解决这个问题，我会洗耳恭听。谢谢!如果您需要更多说明，请随时提出更多问题。
最佳答案
您可以在每个 FOREACH 之前使用 sort()，如下所示。
将您的 Helper 类更改为 public，以便可以从 void Main() 访问它，然后编写您的 Comparer如下:
public class sortPurchaseCostAscendingHelper : IComparer<IZoo>
{
public int Compare(IZoo z1, IZoo z2)
{
if (z1.PurchaseCost > z2.PurchaseCost)
return 1;
if (z1.PurchaseCost < z2.PurchaseCost)
return -1;
else
return 0;
}
}
在每个 FOREACH 之前，您使用特定的 Comparer 调用 sort()，如下所示:
var sortByPurchaseCost = new sortPurchaseCostAscendingHelper();
aZoo.Sort(sortByPurchaseCost);
foreach (IZoo animalData in aZoo)
{
Console.WriteLine($"{animalData}");
}
您可以对其余的比较器执行此操作。
关于c# - 在 C# 中使用多个条件和多个变量对列表进行排序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45261001/