在 C# 中创建数组列表
本文关键字：数组 列表 创建 | 更新日期: 2023-09-27 18:33:56
我在 c# 中创建数组列表时遇到问题，你能帮我吗？我需要创建数组列表以删除所有长度小于 19 的管道。
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
ArrayList lstPipeTypes = new ArrayList();
lstPipeTypes.Add(new PipesList("PVC Pipes"));
((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The blue pipe", 12));
((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The red pipe", 15));
((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The silver pipe", 6));
((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The green pipe", 52));
lstPipeTypes.Add(new PipesList("Iron Pipes"));
((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The gold pipe", 9));
((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The orange pipe", 115));
((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The pink pipe", 1));
lstPipeTypes.Add(new PipesList("Chrome Pipes"));
((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The grey pipe", 12));
((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The black pipe", 15));
((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The white pipe", 19));
((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The brown pipe", 60));
((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The peach pipe", 16));
RemoveTheSmallPipes(lstPipeTypes);
}
public static ArrayList RemoveTheSmallPipes(ArrayList lstPipeTypes)
{
//should remove all pipes that have lengths lower than 19.
return lstPipeTypes;
}
}
class PipesList
{
public string pipeType;
public ArrayList Pipes;
public PipesList(string newBoxType)
{
pipeType = newBoxType;
Pipes = new ArrayList();
}
}
class Pipe
{
public string name;
public float length;
public Pipe(string newName, float newLength)
{
this.name = newName;
this.length = newLength;
}
}
}
我还创建了名为Pipe和PipeList的两个类，我需要将数组列表放在"RemoveTheSmallPipes"方法中。但是我现在很困惑，无法写其余的。请帮我移除所有长度低于 19 的管道。
这是您的方法，无需更改任何其他内容：
public static ArrayList RemoveTheSmallPipes(ArrayList lstPipeTypes)
{
for (int i = 0; i < lstPipeTypes.Count; i++)
{
ArrayList pipesToRemove = new ArrayList();
int pipeCount = ((PipesList)lstPipeTypes[i]).Pipes.Count;
for (int j = 0; j < pipeCount; j++)
{
if (((Pipe)((PipesList)lstPipeTypes[i]).Pipes[j]).length < 19)
{
pipesToRemove.Add(j);
}
}
for (int k = 0; k < pipesToRemove.Count; k++)
{
((PipesList)lstPipeTypes[i]).Pipes.RemoveAt((int)pipesToRemove[k]);
}
}
return lstPipeTypes;
}
真的是一种耻辱，您无法更改任何其他内容，因为此代码不再符合标准。为了向您展示差异，下面是修改后的 C# 4.0 版本：
安慰：
static void Main(string[] args)
{
var pipeTypes = new List<PipePile>();
pipeTypes.Add(new PipePile("PVC Pipes", new List<Pipe>
{
new Pipe { Name = "The blue pipe", Length = 12 },
new Pipe { Name = "The red pipe", Length = 15 },
new Pipe { Name = "The silver pipe", Length = 6 },
new Pipe { Name = "The green pipe", Length = 52 }
}));
pipeTypes.Add(new PipePile("Iron Pipes", new List<Pipe>
{
new Pipe { Name = "The gold pipe", Length = 9 },
new Pipe { Name = "The orange pipe", Length = 115 },
new Pipe { Name = "The pink pipe", Length = 1 }
}));
pipeTypes.Add(new PipePile("Chrome Pipes", new List<Pipe>
{
new Pipe { Name = "The grey pipe", Length = 12 },
new Pipe { Name = "The black pipe", Length = 15 },
new Pipe { Name = "The white pipe", Length = 19 },
new Pipe { Name = "The brown pipe", Length = 60 },
new Pipe { Name = "The peach pipe", Length = 16 }
}));
// Remove all pipes with length longer than 19
pipeTypes.ForEach(pile => pile.Pipes.RemoveAll(pipe => pipe.Length > 19));
}
类：
public class Pipe
{
public string Name { get; set; }
public float Length { get; set; }
}
public class PipePile
{
public string PipeType { get; set; }
public List<Pipe> Pipes { get; set; }
public PipePile(string pipeType, List<Pipe> pipes)
{
PipeType = pipeType;
Pipes = pipes;
}
public PipePile(): this("", new List<Pipe>())
{
}
}
正如你所看到的，它完全不同，但更优雅（Linq FTW！ :)
同意关于使用 List 而不是 ArrayList 的评论，所以我稍微更改了您的代码（会更改更多，但希望保持它看起来很熟悉）。
using System.Collections.Generic;
using System.Linq;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
IList<PipesList> lstPipeTypes = new List <PipesList>();
lstPipeTypes.Add(new PipesList("PVC Pipes"));
(lstPipeTypes[0]).Pipes.Add(new Pipe("The blue pipe", 12));
(lstPipeTypes[0]).Pipes.Add(new Pipe("The red pipe", 15));
(lstPipeTypes[0]).Pipes.Add(new Pipe("The silver pipe", 6));
(lstPipeTypes[0]).Pipes.Add(new Pipe("The green pipe", 52));
lstPipeTypes.Add(new PipesList("Iron Pipes"));
(lstPipeTypes[1]).Pipes.Add(new Pipe("The gold pipe", 9));
(lstPipeTypes[1]).Pipes.Add(new Pipe("The orange pipe", 115));
(lstPipeTypes[1]).Pipes.Add(new Pipe("The pink pipe", 1));
lstPipeTypes.Add(new PipesList("Chrome Pipes"));
(lstPipeTypes[2]).Pipes.Add(new Pipe("The grey pipe", 12));
(lstPipeTypes[2]).Pipes.Add(new Pipe("The black pipe", 15));
(lstPipeTypes[2]).Pipes.Add(new Pipe("The white pipe", 19));
(lstPipeTypes[2]).Pipes.Add(new Pipe("The brown pipe", 60));
(lstPipeTypes[2]).Pipes.Add(new Pipe("The peach pipe", 16));
RemoveTheSmallPipes(lstPipeTypes);
}
public static IList<PipesList> RemoveTheSmallPipes(IList<PipesList> lstPipeTypes)
{
foreach (var pipesList in lstPipeTypes)
{
pipesList.Pipes = pipesList.Pipes.Where(p => p.length >= 19).ToList();
}
return lstPipeTypes;
}
}
class PipesList
{
public string pipeType;
public IList<Pipe> Pipes;
public PipesList(string newBoxType)
{
pipeType = newBoxType;
Pipes = new List <Pipe>();
}
}
class Pipe
{
public string name;
public float length;
public Pipe(string newName, float newLength)
{
this.name = newName;
this.length = newLength;
}
}
}
我还建议您取出硬编码值 19，并使用 const 或其他东西，或者作为该方法的参数。
你可以试试：
for (i = 0; i < lstPipeTypes.Count; i++) {
((PipesList)lstPipeTypes[i]).Pipes.remove(x => x.Length < 19);
}