【C#】ArrayList使用汇总

一、ArrayList转换为数组

（1）方法1

ArrayList List = new ArrayList();

Int32[] values = (Int32[])List.ToArray(typeof(Int32));

 

（2）方法2

ArrayList List = new ArrayList();

Int32[] values = new Int32[List.Count]; 

List.CopyTo(values);

二、初始化List<ArrayList>

正确写法：

            for (int i = 0; i < 32; i++)
            {
                ArrayList tmpWaveDataSource = new ArrayList();
                List1.Add(tmpWaveDataSource);

                ArrayList tmpDataSource = new ArrayList();
                List2.Add(tmpDataSource);
            }

错误写法：

            for (int i = 0; i < 32; i++)
            {
                ArrayList tmpDataSource = new ArrayList();
                List1.Add(tmpDataSource);
                List2.Add(tmpDataSource);
            }

 

三、List<ArrayList>元素赋值

List<ArrayList> List1 = new List<ArrayList>();
List<ArrayList> List2 = new List<ArrayList>();

若ArrayList的元素是自定义类（引用对象），把List2的元素添加到List1时，不能直接添加，否则两个List的值会同时改变.如：

int index = 0;
for (int j = 0; j < 6; j++)
{
        List1[index].Add(new Record(0, (List1[index].Count + 1).ToString(), tmpvalue1));
        List2[index].Add(new Record(0, (List2[index].Count + 1).ToString(), tmpvalue2));
}                

public class Record
{
        int id;
        string xData;
        double yData;
        public Record(int id, string xData, double yData)
        {
            this.id = id;
            this.xData = xData;
            this.yData = yData;
        }
        public int ID
        {
            get { return id; }
            set { id = value; }
        }
        public string XData
        {
            get { return xData; }
            set { xData = value; }
        }
        public double YData
        {
            get { return yData; }
            set { yData = value; }
        }
}

添加元素：

//错误写法：
List1[0].Add(List2[0][0]);


//正确写法：
string dataX = ((Record)List2[0][0]).XData;
double dataY = ((Record)List2[0][0]).YData;
List1[0].Add(new Record(0, dataX, dataY));