如果我想用ArrayList存储一个二维数组要怎么做？

[loveqq123]

rt

[lookfeng]

关键是看你想这么存！
楼上的也是一种办法。
当然你也可以存储每个元素，自是你自己需要知道规则！

[meixiaofeng]

对象-〉数组

[2021‘someday]

就是数据结构间的转换吧？

[inshua]

Dim al[1] As New ArrayList

[sxlfybb]

using system.collention;
arraylist arr = new arraylist();
arr.add(object);

[amendajing]

.

[rcom10002]

帮你写个二维的，等一下，呵呵

[lovevsnet]

直接加就行了
ArrayList.Add(object o);
public class youritem
{
private string Key;
private object Value;
public youritem(string ky,object obj)
{
Key=ky;
Value=obj;
}
...
}
ArrayList a=new ArrayList();
youritem it=new youritem("mike",20);
a.Add(it);

[yellowfish2001]

struct Data
{
public int ID;
public string Name;
}

ArrayList arr = new ArrayList();

for(int i = 0; i< 100; i++)
{
Data d = new Data();
d.ID = i;
arr.Add(d);
}

[sukyboor]

ArrayList里面放ArrayList就可以了

[cancerser]

我楼上的，你太酷了

[rcom10002]

using System;
using System.Data;
using System.Collections;

namespace ConsoleApp_CS
{
public class Matrix
{

private ArrayList col;
private ArrayList row;
private int colCount;
private int rowCount;

public Matrix()
{
this.col = new ArrayList();
this.row = new ArrayList();
}

public Matrix(int rowCount, int colCount)
{
this.col = new ArrayList();
this.row = new ArrayList();
this.colCount = colCount;
this.rowCount = rowCount;
this.ConstructMatrix(rowCount, colCount);
}

//Set Dimension
public void SetDimension(int rowCount, int colCount)
{
this.ConstructMatrix(rowCount, colCount);
}

//Construct a matrix
private void ConstructMatrix(int rowCount, int colCount)
{
if ((rowCount <= 0) || (colCount <= 0))
{
throw new Exception("Dimension can't be negative");
}

//Change number of rows
if (this.col.Count > rowCount)
{
this.col.RemoveRange(colCount - 1, this.colCount - colCount);
}

//Change number of rows
if (this.col.Count < rowCount)
{
ArrayList append = new ArrayList();
for (int i = this.row.Count; i < rowCount; i++)
{
append.Add(new ArrayList());
}
this.col.AddRange(append);
}

//Set the "row"
this.row.Clear();
this.row = (ArrayList)(this.GetArrayListElement(col.GetRange(0, 1)));

//Todo:Change number of columns
if (this.row.Count > colCount)
{
foreach(object o in this.col)
{
((ArrayList)o).RemoveRange(rowCount - 1, this.rowCount - rowCount);
}
}

//Change number of columns
if (this.row.Count < colCount)
{
ArrayList append = new ArrayList();
for (int i = this.row.Count; i < rowCount; i++)
{
append.Add(null);
}
foreach(object o in this.col)
{
((ArrayList)o).AddRange(append);
}
}

this.colCount = colCount;
this.rowCount = rowCount;
}

//Get the number of rows
int RowCount
{
get
{
return this.colCount;
}
}

//Get the number of columns
int ColumnCount
{
get
{
return this.rowCount;
}
}

//Get a item specified by rowIndex, colIndex
public object GetItem(int rowIndex, int colIndex)
{
if (!RangeCheck(rowIndex, colIndex))
{
throw new ArgumentOutOfRangeException("Parameter rowIndex or colIndex is out of range.");
}

object item;
item = this.GetArrayListElement(this.col.GetRange(rowIndex, 1));
return this.GetArrayListElement(((ArrayList)item).GetRange(colIndex,1));
}

//Set a item specified by rowIndex, colIndex
public void SetItem(object val, int rowIndex, int colIndex)
{
if (!RangeCheck(rowIndex, colIndex))
{
throw new Exception("Parameter rowIndex or colIndex is out of range.");
}

object rowItem;
rowItem = this.col.GetRange(rowIndex, 1);
rowItem = (ArrayList)(this.GetArrayListElement((ArrayList)rowItem));
((ArrayList)rowItem).Insert(colIndex, val);
((ArrayList)rowItem).RemoveAt(colIndex + 1);
}

//Romove a item specified by rowIndex, colIndex
public void RemoveItem(int rowIndex, int colIndex)
{
if (RangeCheck(rowIndex, colIndex))
{
throw new ArgumentOutOfRangeException("Parameter rowIndex or colIndex is out of range.");
}

object item;
item = this.col.GetRange(rowIndex, 1);
((ArrayList)item).Insert(colIndex, null);
((ArrayList)item).RemoveAt(colIndex + 1);
}

//Remove all items in the matrix
public void RemoveAll()
{
this.col.Clear();
}

//Check whether the range is out of that in matrix
private bool RangeCheck(int rowIndex, int colIndex)
{
if ((rowIndex < this.col.Count) && (colIndex < this.row.Count))
return true;
else
return false;
}

//GetValue
private object GetArrayListElement(ArrayList myList)
{
IEnumerator myEnumerator = myList.GetEnumerator();
while ( myEnumerator.MoveNext() )
return myEnumerator.Current;
return null;
}
}
}

[GX198302]

ArrayList能放任何你想放的东西

[CoolKin9]

简单：
int[,] myINT= new int[5,8,12];
ArrayList myList = new ArrayList();
myList.Add(myINT);