在web开发过程中，有时候为了数据传输的方便，比如：后台需要更新前端的ViewModel，此时我们定义一个与前端ViewModel结构一样的DTO对象，从数据层获取数据后，将数据封装成DTO然后序列化为json传回前端，由于我正在开发的项目中的Model是用DataSet来实现的，不是纯粹的面向对象（如果Model是对象的话可以用AutoMapper来实现转换），所以从数据层获取的都是DataSet或DataTable，这时需要将DataTable转换为DTO对象，DTO对象的属性与DataTable的列之间并不是一一对应的关系，为了转换方便，实现了一个简易的转换类，代码如下：
1 public class DtObjConverter
2 {
3
4 /// <summary>
5 /// 将DataTable转换成对象，对象的属性与列同名
6 /// </summary>
7 /// <typeparam name="T"></typeparam>
8 /// <param name="datatable"></param>
9 /// <returns></returns>
10 public List<T> ConvertTo<T>(DataTable datatable) where T : new()
11 {
12 List<T> Temp = new List<T>();
13 try
14 {
15 List<string> columnsNames = new List<string>();
16 foreach (DataColumn DataColumn in datatable.Columns)
17 columnsNames.Add(DataColumn.ColumnName);
18 Temp = datatable.AsEnumerable().ToList().ConvertAll<T>(row => getObject<T>(row, columnsNames));
19 return Temp;
20 }
21 catch
22 {
23 return Temp;
24 }
25
26 }
27
28 /// <summary>
29 /// 将DataTable转换成对象，对象的属性会根据map参数进行转换
30 /// </summary>
31 /// <typeparam name="T"></typeparam>
32 /// <param name="datatable"></param>
33 /// <param name="map"></param>
34 /// <returns></returns>
35 public List<T> ConvertTo<T>(DataTable datatable, Hashtable map) where T : new()
36 {
37 List<T> Temp = new List<T>();
38 try
39 {
40 List<string> columnsNames = new List<string>();
41 foreach (DataColumn DataColumn in datatable.Columns)
42 columnsNames.Add(DataColumn.ColumnName);
43 Temp = datatable.AsEnumerable().ToList().ConvertAll<T>(row => getMapObject<T>(row, columnsNames, map));
44 return Temp;
45 }
46 catch
47 {
48 return Temp;
49 }
50
51 }
52
53 /// <summary>
54 /// 根据DataTable生成对象，对象的属性与列同名
55 /// </summary>
56 /// <typeparam name="T"></typeparam>
57 /// <param name="row"></param>
58 /// <param name="columnsName"></param>
59 /// <returns></returns>
60 public T getObject<T>(DataRow row, List<string> columnsName) where T : new()
61 {
62 T obj = new T();
63 try
64 {
65 string columnname = "";
66 string value = "";
67 PropertyInfo[] Properties;
68 Properties = typeof(T).GetProperties();
69 foreach (PropertyInfo objProperty in Properties)
70 {
71 columnname = columnsName.Find(name => name.ToLower() == objProperty.Name.ToLower());
72 if (!string.IsNullOrEmpty(columnname))
73 {
74 value = row[columnname].ToString();
75 if (!string.IsNullOrEmpty(value))
76 {
77 if (Nullable.GetUnderlyingType(objProperty.PropertyType) != null)
78 {
79 value = row[columnname].ToString().Replace("$", "").Replace(",", "");
80 objProperty.SetValue(obj, Convert.ChangeType(value, Type.GetType(Nullable.GetUnderlyingType(objProperty.PropertyType).ToString())), null);
81 }
82 else
83 {
84 value = row[columnname].ToString().Replace("%", "");
85 objProperty.SetValue(obj, Convert.ChangeType(value, Type.GetType(objProperty.PropertyType.ToString())), null);
86 }
87 }
88 }
89 }
90 return obj;
91 }
92 catch
93 {
94 return obj;
95 }
96 }
97
98 /// <summary>
99 /// 根据DataTable生成对象，对象的属性会根据map参数进行转换
100 /// </summary>
101 /// <typeparam name="T"></typeparam>
102 /// <param name="row"></param>
103 /// <param name="columnsName"></param>
104 /// <returns></returns>
105 public T getMapObject<T>(DataRow row, List<string> columnsName, Hashtable map) where T : new()
106 {
107 T obj = new T();
108 try
109 {
110 string columnname = "";
111 string value = "";
112 PropertyInfo[] Properties;
113 Properties = typeof(T).GetProperties();
114 foreach (PropertyInfo objProperty in Properties)
115 {
116 string prpertyName = objProperty.Name;
117 columnname = columnsName.Find(name => name.ToLower() == map[prpertyName].ToString().ToLower());
118 if (!string.IsNullOrEmpty(columnname))
119 {
120 value = row[columnname].ToString();
121 if (!string.IsNullOrEmpty(value))
122 {
123 if (Nullable.GetUnderlyingType(objProperty.PropertyType) != null)
124 {
125 value = row[columnname].ToString().Replace("$", "").Replace(",", "");
126 objProperty.SetValue(obj, Convert.ChangeType(value, Type.GetType(Nullable.GetUnderlyingType(objProperty.PropertyType).ToString())), null);
127 }
128 else
129 {
130 value = row[columnname].ToString().Replace("%", "");
131 objProperty.SetValue(obj, Convert.ChangeType(value, Type.GetType(objProperty.PropertyType.ToString())), null);
132 }
133 }
134 }
135 }
136 return obj;
137 }
138 catch (Exception e)
139 {
140 string error = e.Message;
141 return obj;
142 }
143 }
144
145 public DataTable ToDataTable<T>(IEnumerable<T> collection)
146 {
147 DataTable newDataTable = new DataTable();
148 Type impliedType = typeof(T);
149 PropertyInfo[] _propInfo = impliedType.GetProperties();
150 foreach (PropertyInfo pi in _propInfo)
151 newDataTable.Columns.Add(pi.Name, pi.PropertyType);
152
153 foreach (T item in collection)
154 {
155 DataRow newDataRow = newDataTable.NewRow();
156 newDataRow.BeginEdit();
157 foreach (PropertyInfo pi in _propInfo)
158 newDataRow[pi.Name] = pi.GetValue(item, null);
159 newDataRow.EndEdit();
160 newDataTable.Rows.Add(newDataRow);
161 }
162 return newDataTable;
163 }
164
165 }
用法：
DtObjConverterConvert convert = new DtObjConverterConvert ();
//配置映射
Hashtable map = new Hashtable();
map.Add("Title", "name"); //key为对象属性名，value为表列名
/*----- 此处省略其他字段的添加 -----*/
List<YourDTOModel> dtoModelList = convert.ConvertTo<YourDTOModel>(dt, map);
时间： 2024-08-15 08:34:39