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![C#将 List 转为 byte[]](https://ztsky.cnush.cn/wp-content/uploads/2020/11/20201124_5fbcdcc2c0e4f.jpg)
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; namespace list { public partial class Form1 : Form { public Form1() { InitializeComponent(); } //将List<double> 转为 byte[] static byte[] ConvertDoubleArrayToBytes(List<double> matrix) { if (matrix == null) { return new byte[0]; } using (MemoryStream stream = new MemoryStream()) { BinaryWriter bw = new BinaryWriter(stream); foreach (var item in matrix) { bw.Write(item); } return stream.ToArray(); } } //将byte[] 转为 List<double> static List<double> ConvertBytesToDoubleArray(byte[] matrix) { if (matrix == null) return null; List<double> result = new List<double>(); using (var br = new BinaryReader(new MemoryStream(matrix))) { var ptCount = matrix.Length / 8; for (int i = 0; i < ptCount; i++) { result.Add(br.ReadDouble()); } return result; } } private void Form1_Load(object sender, EventArgs e) { List<double> data = new List<double> { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 }; byte[] bdata = ConvertDoubleArrayToBytes(data); data = ConvertBytesToDoubleArray(bdata); foreach (var item in data) { listBox1.Items.Add(item); } } } }
![C#将 List 转为 byte[]](https://ztsky.cnush.cn/wp-content/uploads/2020/11/20201124_5fbcdcc326db3.png)
List<T>是泛型集合
这种集合规定了集合内的数据类型，只能存放<T>的T类型数据；
而ArrayList不是泛型，这种集合中可以存放任意类型数据；
举个简单例子：List<Student> students=new List<Student>(); 那么读取数据时就不用类型转化了，即：Student stu=students[0]; 增、删、改、查的方法：students.Add(T t);//增 students.Remove(int index);//删 stucents.Remove(T t);//删 students[]=//修改的数据 //查或者改 遍历集合类似于遍历数组 ArrayList students=new ArrayList(); Student stu=students[0] as Student;
