c#拓展方法将datatable转换成实体

1. /// <summary>
2. /// DataTable 转换为 List<T>
3. /// </summary>
4. /// <typeparam name="T"></typeparam>
5. /// <param name="dt"></param>
6. /// <returns></returns>
7. public static List<T> ToList<T>(this DataTable dt) where T : class,new()
8. {
9. Type t = typeof(T);
10. PropertyInfo[] propertys = t.GetProperties();
11. List<T> lst = new List<T>();
12. string typeName = string.Empty;
13.  
14. foreach (DataRow dr in dt.Rows)
15. {
16. T entity = new T();
17. foreach (PropertyInfo pi in propertys)
18. {
19. typeName = pi.Name;
20. if (dt.Columns.Contains(typeName))
21. {
22. if (!pi.CanWrite) continue;
23. object value = dr[typeName];
24. if (value == DBNull.Value) continue;
25. if (pi.PropertyType == typeof(string))
26. {
27. pi.SetValue(entity, value.ToString(), null);
28. }
29. else if (pi.PropertyType == typeof(int) || pi.PropertyType == typeof(int?))
30. {
31. pi.SetValue(entity, int.Parse(value.ToString()), null);
32. }
33. else if (pi.PropertyType == typeof(DateTime?) || pi.PropertyType == typeof(DateTime))
34. {
35. pi.SetValue(entity, DateTime.Parse(value.ToString()), null);
36. }
37. else if (pi.PropertyType == typeof(float) || pi.PropertyType == typeof(float?))
38. {
39. pi.SetValue(entity, float.Parse(value.ToString()), null);
40. }
41. else if (pi.PropertyType == typeof(double) || pi.PropertyType == typeof(double?))
42. {
43. pi.SetValue(entity, double.Parse(value.ToString()), null);
44. }
45. else if (pi.PropertyType == typeof(byte) || pi.PropertyType == typeof(byte?))
46. {
47. pi.SetValue(entity, byte.Parse(value.ToString()), null);
48. }
49. else if (pi.PropertyType == typeof(Int16) || pi.PropertyType == typeof(Int16?))
50. {
51. pi.SetValue(entity, Int16.Parse(value.ToString()), null);
52. }
53. else
54. {
55. pi.SetValue(entity, value, null);
56. }
57. }
58. }
59. lst.Add(entity);
60. }
61. return lst;
62. }