我用的将集合类转换为DataTable 的方法
///
/// 将集合类转换成DataTable
///
/// 集合
///
private static DataTable ToDataTableTow(IList list)
{
DataTable result = new DataTable();
if (list.Count > 0)
{
PropertyInfo[] propertys = list[0].GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
result.Columns.Add(pi.Name, pi.PropertyType);
}
foreach (object t in list)
{
ArrayList tempList = new ArrayList();
foreach (PropertyInfo pi in propertys)
{
object obj = pi.GetValue(t, null);
tempList.Add(obj);
}
object[] array = tempList.ToArray();
result.LoadDataRow(array, true);
}
}
return result;
}
将DataTable转换为List
///
/// DataTable 转换为List 集合
///
/// 类型
/// DataTable
///
public static List ToList(this DataTable dt) where T : class, new()
{
//创建一个属性的列表
List prlist = new List();
//获取TResult的类型实例 反射的入口
Type t = typeof(T);
//获得TResult 的所有的Public 属性 并找出TResult属性和DataTable的列名称相同的属性(PropertyInfo) 并加入到属性列表
Array.ForEach(t.GetProperties(), p => { if (dt.Columns.IndexOf(p.Name) != -1) prlist.Add(p); });
//创建返回的集合
List oblist = new List();
foreach (DataRow row in dt.Rows)
{
//创建TResult的实例
T ob = new T();
//找到对应的数据 并赋值
prlist.ForEach(p => { if (row[p.Name] != DBNull.Value) p.SetValue(ob, row[p.Name], null); });
//放入到返回的集合中.
oblist.Add(ob);
}
return oblist;
}
其它的实现方式
///
/// 转化一个DataTable
///
///
///
///
public static DataTable ToDataTable(this IEnumerable list)
{
//创建属性的集合
List pList = new List();
//获得反射的入口
Type type = typeof(T);
DataTable dt = new DataTable();
//把所有的public属性加入到集合 并添加DataTable的列
Array.ForEach(type.GetProperties(), p => { pList.Add(p); dt.Columns.Add(p.Name, p.PropertyType); });
foreach (var item in list)
{
//创建一个DataRow实例
DataRow row = dt.NewRow();
//给row 赋值
pList.ForEach(p => row[p.Name] = p.GetValue(item, null));
//加入到DataTable
dt.Rows.Add(row);
}
return dt;
}
返回指定的列
///
/// 将泛型集合类转换成DataTable
///
/// 集合项类型
/// 集合
/// 数据集(表)
public static DataTable ToDataTable(IList list)
{
return ToDataTable(list, null);
}
/**/
///
/// 将泛型集合类转换成DataTable
///
/// 集合项类型
/// 集合
/// 需要返回的列的列名
/// 数据集(表)
public static DataTable ToDataTable(IList list, params string[] propertyName)
{
List propertyNameList = new List();
if (propertyName != null)
propertyNameList.AddRange(propertyName);
DataTable result = new DataTable();
if (list.Count > 0)
{
PropertyInfo[] propertys = list[0].GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
if (propertyNameList.Count == 0)
{
result.Columns.Add(pi.Name, pi.PropertyType);
}
else
{
if (propertyNameList.Contains(pi.Name))
result.Columns.Add(pi.Name, pi.PropertyType);
}
}
for (int i = 0; i < list.Count; i++)
{
ArrayList tempList = new ArrayList();
foreach (PropertyInfo pi in propertys)
{
if (propertyNameList.Count == 0)
{
object obj = pi.GetValue(list[i], null);
tempList.Add(obj);
}
else
{
if (propertyNameList.Contains(pi.Name))
{
object obj = pi.GetValue(list[i], null);
tempList.Add(obj);
}
}
}
object[] array = tempList.ToArray();
result.LoadDataRow(array, true);
}
}
return result;
}
}
#region DataTale转为实体列表
///
/// DataTale转为实体列表
///
/// 实体类类型
/// DataTable
/// List
public List DataTableToModelList(DataTable table)
{
List list = new List();
T t = default(T);
PropertyInfo[] propertypes = null;
string tempName = string.Empty;
foreach (DataRow row in table.Rows)
{
t = Activator.CreateInstance();
propertypes = t.GetType().GetProperties();
foreach (PropertyInfo pro in propertypes)
{
tempName = pro.Name;
if (table.Columns.Contains(tempName))
{
object value = row[tempName];
if (value.GetType() == typeof(System.DBNull))
{
value = null;
}
pro.SetValue(t, value, null);
}
}
list.Add(t);
}
return list;
}
#endregion
#region DataRow转为实体类
///
/// DataRow转为实体类
///
/// 实体类类型
/// DataRow
/// T
public T DataRowToModel(DataRow row)
{
T t = default(T);
PropertyInfo[] propertypes = null;
string tempName = string.Empty;
t = Activator.CreateInstance();
propertypes = t.GetType().GetProperties();
foreach (PropertyInfo pro in propertypes)
{
tempName = pro.Name;
if (row.Table.Columns.Contains(tempName))
{
object value = row[tempName];
if (value.GetType() == typeof(System.DBNull))
{
value = null;
}
pro.SetValue(t, value, null);
}
}
return t;
}
#endregion
