DataTable转换为其他对象

Posted 2020-08-24 凌云卧星

1.将DataTable类型的数据转换成List<T>集合

 1 /// <summary>
 2 /// 将DataTable类型的数据转换成List<T>集合 T实体
 3 /// </summary>
 4 /// <typeparam name="T"></typeparam>
 5 /// <param name="dataTable"></param>
 6 /// <returns></returns>
 7 public static List<T> DataTableToList<T>(DataTable dataTable)
 8 {
 9     List<T> list = new List<T>();
10     Type targetType = typeof(T);
11     PropertyInfo[] allPropertyArray = targetType.GetProperties();
12     foreach (DataRow rowElement in dataTable.Rows)
13     {
14         T element = Activator.CreateInstance<T>();
15         foreach (DataColumn columnElement in dataTable.Columns)
16         {
17             foreach (PropertyInfo property in allPropertyArray)
18             {
19                 if (property.Name.Equals(columnElement.ColumnName))
20                 {
21                     if (rowElement[columnElement.ColumnName] == DBNull.Value)
22                     {
23                         property.SetValue(element, null, null);
24                     }
25                     else
26                     {
27                         property.SetValue(element, rowElement
28                         [columnElement.ColumnName], null);
29                     }
30                 }
31             }
32         }
33         list.Add(element);
34     }
35     return list;
36 }

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 2.将DataTable的第一行转换为实体T 表转实体

 1 /// <summary>
 2 /// 将DataTable的第一行转换为实体T 表转实体
 3 /// </summary>
 4 /// <typeparam name="T"></typeparam>
 5 /// <param name="dataTable"></param>
 6 /// <returns></returns>
 7 public static T DataTalbeToEntity<T>(DataTable dataTable)
 8 {
 9     T element = Activator.CreateInstance<T>();
10     Type targetType = typeof(T);
11     PropertyInfo[] allPropertyArray = targetType.GetProperties();
12     if (dataTable != null && dataTable.Rows.Count > 0)
13     {
14         DataRow rowElement = dataTable.Rows[0];
15         foreach (DataColumn columnElement in dataTable.Columns)
16         {
17             foreach (PropertyInfo property in allPropertyArray)
18             {
19                 if (property.Name.Equals(columnElement.ColumnName))
20                 {
21                     if (rowElement[columnElement.ColumnName] == DBNull.Value)
22                     {
23                         property.SetValue(element, null, null);
24                     }
25                     else
26                     {
27                         property.SetValue(element, rowElement
28                         [columnElement.ColumnName], null);
29                     }
30                 }
31             }
32         }
33     }
34     else
35     {
36         return default(T);//返回null
37     }
38     return element;
39 }

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3.根据情况对DaTaTable进行分页

 1 /// <summary>
 2 /// 根据情况对DaTaTable进行分页
 3 /// </summary>
 4 /// <returns></returns>
 5 public static DataTable GetPageTable(DataTable dt, int CurrentPageIndex, int PageSize, ref int RecordCount)
 6 {
 7     DataTable newdt = dt.Clone();
 8     RecordCount = dt.Rows.Count;
 9     for (int i = (CurrentPageIndex - 1) * PageSize; i < CurrentPageIndex * PageSize; i++)
10     {
11         if (i < RecordCount)
12         {
13             newdt.Rows.Add(dt.Rows[i].ItemArray);
14         }
15     }
16     return newdt;
17 }

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