C# DataTable转List

Posted 2022-09-13 lujingbk

ORM:

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Data;
 4 using System.Linq;
 5 using System.Reflection;
 6 using System.Web;
 7 
 8 namespace WebApplication1.date
 9 
10     public class ORM
11     
12         static public List<T> Tolist<T>(DataTable dt) where T : class, new()
13         
14             Type t = typeof(T);
15             PropertyInfo[] PropertyInfo = t.GetProperties();
16             List<T> list = new List<T>();
17 
18             string typeName = string.Empty;
19             foreach (DataRow item in dt.Rows)
20             
21                 T obj = new T();
22                 foreach (PropertyInfo s in PropertyInfo)
23                 
24                     typeName = s.Name;
25                     if (dt.Columns.Contains(typeName))
26                     
27                         if (!s.CanWrite) continue;
28 
29                         object value = item[typeName];
30                         if (value == DBNull.Value) continue;
31 
32                         if (s.PropertyType == typeof(string))
33                         
34                             s.SetValue(obj, value.ToString(), null);
35                         
36                         else
37                         
38                             s.SetValue(obj, value, null);
39                         
40                     
41                 
42                 list.Add(obj);
43             
44             return list;
45         
46 
47     
48 

创建DataTable:

 1 DataTable tblDatas = new DataTable("User");
 2             DataColumn dc = null;
 3             dc = tblDatas.Columns.Add("Id", Type.GetType("System.Int32"));
 4             dc.AutoIncrement = true;//自动增加
 5             dc.AutoIncrementSeed = 1;//起始为1
 6             dc.AutoIncrementStep = 1;//步长为1
 7             dc.AllowDBNull = false;//
 8 
 9             dc = tblDatas.Columns.Add("Name", Type.GetType("System.String"));
10             dc = tblDatas.Columns.Add("Pwd", Type.GetType("System.String"));
11 
12             DataRow newRow;
13             newRow = tblDatas.NewRow();
14             newRow["Name"] = "张三";
15             newRow["Pwd"] = "123";
16             tblDatas.Rows.Add(newRow);
17 
18             newRow = tblDatas.NewRow();
19             newRow["Name"] = "李四";
20             newRow["Pwd"] = "123456";
21             tblDatas.Rows.Add(newRow);
22             //调用ORM TOlist 泛型
23             var i = ORM.Tolist<User>(tblDatas);
24             var a = JsonConvert.SerializeObject(i);
25             Console.WriteLine(a);
26             Console.ReadKey();

 

创建类 User

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 
 6 namespace ConsoleApp1
 7 
 8     public class User
 9     
10         public int Id  get; set; 
11         public string Name  get; set; 
12         public string Pwd  get; set; 
13     
14