DataSet与集合的相互转换

  1  /// <summary>
  2             /// DataSetToList
  3             /// </summary>
  4             /// <typeparam name="T">转换类型</typeparam>
  5             /// <param name="dataSet">数据源</param>
  6             /// <param name="tableIndex">需要转换表的索引</param>
  7             /// <returns></returns>
  8             public IList<T> DataSetToList<T>(DataSet dataSet, int tableIndex)
  9             {
 10                 //确认参数有效
 11                 if (dataSet == null || dataSet.Tables.Count <= 0 || tableIndex < 0)
 12                     return null;
 13                 DataTable dt = dataSet.Tables[tableIndex];
 14                 IList<T> list = new List<T>();
 15                 for (int i = 0; i < dt.Rows.Count; i++)
 16                 {
 17                     //创建泛型对象
 18                     T _t = Activator.CreateInstance<T>();
 19                     //获取对象所有属性
 20                     PropertyInfo[] propertyInfo = _t.GetType().GetProperties();
 21                     for (int j = 0; j < dt.Columns.Count; j++)
 22                     {
 23                         foreach (PropertyInfo info in propertyInfo)
 24                         {
 25                             //属性名称和列名相同时赋值
 26                             if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
 27                             {
 28                                 if (dt.Rows[i][j] != DBNull.Value)
 29                                 {
 30                                     info.SetValue(_t, dt.Rows[i][j], null);
 31                                 }
 32                                 else
 33                                 {
 34                                     info.SetValue(_t, null, null);
 35                                 }
 36                                 break;
 37                             }
 38                         }
 39                     }
 40                     list.Add(_t);
 41                 }
 42                 return list;
 43             }
 44 
 45 
 46 /// <summary> 
 47 /// 泛型集合与DataSet互相转换 
 48 /// </summary> 
 49 public class IListDataSet 
 50 { 
 51 
 52 /// <summary> 
 53 /// 集合装换DataSet 
 54 /// </summary> 
 55 /// <param name="list">集合</param> 
 56 /// <returns></returns> 
 57 /// 2008-08-01 22:08 HPDV2806 
 58 public static DataSet ToDataSet( IList p_List ) 
 59 { 
 60 DataSet result = new DataSet(); 
 61 DataTable _DataTable = new DataTable(); 
 62 if ( p_List.Count > 0 ) 
 63 { 
 64 PropertyInfo[] propertys = p_List[0].GetType().GetProperties(); 
 65 foreach ( PropertyInfo pi in propertys ) 
 66 { 
 67 _DataTable.Columns.Add( pi.Name, pi.PropertyType ); 
 68 } 
 69 
 70 for ( int i = 0; i < p_List.Count; i++ ) 
 71 { 
 72 ArrayList tempList = new ArrayList(); 
 73 foreach ( PropertyInfo pi in propertys ) 
 74 { 
 75 object obj = pi.GetValue( p_List[i], null ); 
 76 tempList.Add( obj ); 
 77 } 
 78 object[] array = tempList.ToArray(); 
 79 _DataTable.LoadDataRow( array, true ); 
 80 } 
 81 } 
 82 result.Tables.Add( _DataTable ); 
 83 return result; 
 84 } 
 85 
 86 /// <summary> 
 87 /// 泛型集合转换DataSet 
 88 /// </summary> 
 89 /// <typeparam name="T"></typeparam> 
 90 /// <param name="list">泛型集合</param> 
 91 /// <returns></returns> 
 92 /// 2008-08-01 22:43 HPDV2806 
 93 public static DataSet ToDataSet<T>( IList<T> list ) 
 94 { 
 95 return ToDataSet<T>( list, null ); 
 96 } 
 97 
 98 
 99 /// <summary> 
100 /// 泛型集合转换DataSet 
101 /// </summary> 
102 /// <typeparam name="T"></typeparam> 
103 /// <param name="p_List">泛型集合</param> 
104 /// <param name="p_PropertyName">待转换属性名数组</param> 
105 /// <returns></returns> 
106 /// 2008-08-01 22:44 HPDV2806 
107 public static DataSet ToDataSet<T>( IList<T> p_List, params string[] p_PropertyName ) 
108 { 
109 List<string> propertyNameList = new List<string>(); 
110 if ( p_PropertyName != null ) 
111 propertyNameList.AddRange( p_PropertyName ); 
112 
113 DataSet result = new DataSet(); 
114 DataTable _DataTable = new DataTable(); 
115 if ( p_List.Count > 0 ) 
116 { 
117 PropertyInfo[] propertys = p_List[0].GetType().GetProperties(); 
118 foreach ( PropertyInfo pi in propertys ) 
119 { 
120 if ( propertyNameList.Count == 0 ) 
121 { 
122 // 没有指定属性的情况下全部属性都要转换 
123 _DataTable.Columns.Add( pi.Name, pi.PropertyType ); 
124 } 
125 else 
126 { 
127 if ( propertyNameList.Contains( pi.Name ) ) 
128 _DataTable.Columns.Add( pi.Name, pi.PropertyType ); 
129 } 
130 } 
131 
132 for ( int i = 0; i < p_List.Count; i++ ) 
133 { 
134 ArrayList tempList = new ArrayList(); 
135 foreach ( PropertyInfo pi in propertys ) 
136 { 
137 if ( propertyNameList.Count == 0 ) 
138 { 
139 object obj = pi.GetValue( p_List[i], null ); 
140 tempList.Add( obj ); 
141 } 
142 else 
143 { 
144 if ( propertyNameList.Contains( pi.Name ) ) 
145 { 
146 object obj = pi.GetValue( p_List[i], null ); 
147 tempList.Add( obj ); 
148 } 
149 } 
150 } 
151 object[] array = tempList.ToArray(); 
152 _DataTable.LoadDataRow( array, true ); 
153 } 
154 } 
155 result.Tables.Add( _DataTable ); 
156 return result; 
157 } 
158 
159 /// <summary> 
160 /// DataSet装换为泛型集合 
161 /// </summary> 
162 /// <typeparam name="T"></typeparam> 
163 /// <param name="p_DataSet">DataSet</param> 
164 /// <param name="p_TableIndex">待转换数据表索引</param> 
165 /// <returns></returns> 
166 /// 2008-08-01 22:46 HPDV2806 
167 public static IList<T> DataSetToIList<T>( DataSet p_DataSet, int p_TableIndex ) 
168 { 
169 if ( p_DataSet == null || p_DataSet.Tables.Count < 0 ) 
170 return null; 
171 if ( p_TableIndex > p_DataSet.Tables.Count - 1 ) 
172 return null; 
173 if ( p_TableIndex < 0 ) 
174 p_TableIndex = 0; 
175 
176 DataTable p_Data = p_DataSet.Tables[p_TableIndex]; 
177 // 返回值初始化 
178 IList<T> result = new List<T>(); 
179 for ( int j = 0; j < p_Data.Rows.Count; j++ ) 
180 { 
181 T _t = (T)Activator.CreateInstance( typeof( T ) ); 
182 PropertyInfo[] propertys = _t.GetType().GetProperties(); 
183 foreach ( PropertyInfo pi in propertys ) 
184 { 
185 for ( int i = 0; i < p_Data.Columns.Count; i++ ) 
186 { 
187 // 属性与字段名称一致的进行赋值 
188 if ( pi.Name.Equals( p_Data.Columns[i].ColumnName ) ) 
189 { 
190 // 数据库NULL值单独处理 
191 if ( p_Data.Rows[j][i] != DBNull.Value ) 
192 pi.SetValue( _t, p_Data.Rows[j][i], null ); 
193 else 
194 pi.SetValue( _t, null, null ); 
195 break; 
196 } 
197 } 
198 } 
199 result.Add( _t ); 
200 } 
201 return result; 
202 } 
203 
204 /// <summary> 
205 /// DataSet装换为泛型集合 
206 /// </summary> 
207 /// <typeparam name="T"></typeparam> 
208 /// <param name="p_DataSet">DataSet</param> 
209 /// <param name="p_TableName">待转换数据表名称</param> 
210 /// <returns></returns> 
211 /// 2008-08-01 22:47 HPDV2806 
212 public static IList<T> DataSetToIList<T>( DataSet p_DataSet, string p_TableName ) 
213 { 
214 int _TableIndex = 0; 
215 if ( p_DataSet == null || p_DataSet.Tables.Count < 0 ) 
216 return null; 
217 if ( string.IsNullOrEmpty( p_TableName ) ) 
218 return null; 
219 for ( int i = 0; i < p_DataSet.Tables.Count; i++ ) 
220 { 
221 // 获取Table名称在Tables集合中的索引值 
222 if ( p_DataSet.Tables[i].TableName.Equals( p_TableName ) ) 
223 { 
224 _TableIndex = i; 
225 break; 
226 } 
227 } 
228 return DataSetToIList<T>( p_DataSet, _TableIndex ); 
229 } 
230 }