DataTable转换成List

很多时候需要将DataTable转换成一组model，直接对model执行操作会更加方便直观。

代码如下：

 1  public static class DataTableToModel

 2     {

 3         public static List<T> ConvertToModel<T>(this DataTable dt)

 4         {

 5             if (dt == null || dt.Rows.Count == 0)

 6             {

 7                 return null;

 8             }

 9 

10             var result = new List<T>();

11 

12             var objType = typeof(T);

13             var properties = objType.GetProperties();

14             var columnNames = GetDataTableColumnNames(dt);

15 

16             foreach (DataRow dr in dt.Rows)

17             {

18                 var obj = objType.Assembly.CreateInstance(objType.FullName);

19                 //var obj = Activator.CreateInstance(objType);

20                 foreach (var property in properties)

21                 {

22                     if (columnNames.Contains(property.Name))

23                     { 

24                         var cellValue=dr[property.Name];

25                         object propertyValue=cellValue;

26 

27                         //非泛型

28                         if (!property.PropertyType.IsGenericType)

29                         {

30                             propertyValue = cellValue == null ? null : Convert.ChangeType(cellValue, property.PropertyType);

31                         }

32                         else //泛型Nullable<>

33                         {

34                             Type genericTypeDefinition = property.PropertyType.GetGenericTypeDefinition();

35                             if (genericTypeDefinition == typeof(Nullable<>))

36                             {

37                                 propertyValue = cellValue == null ? null : Convert.ChangeType(cellValue, Nullable.GetUnderlyingType(property.PropertyType));

38                             }

39                         }

40 

41                         property.SetValue(obj, propertyValue, null);

42                     }

43                 }

44 

45                 result.Add((T)obj);

46             }

47 

48             return result;

49         }

50 

51         private static HashSet<string> GetDataTableColumnNames(DataTable dt)

52         {

53             var columnNames = new HashSet<string>();

54             foreach (DataColumn column in dt.Columns)

55             {

56                 columnNames.Add(column.ColumnName);

57             }

58             return columnNames;

59         }

60     }