/// <summary>
/// LIST实体转换表格
/// </summary>
/// <typeparam name="T">泛型类型</typeparam>
/// <param name="entityList"></param>
/// <returns></returns>
public static DataTable ToDataTable <T>(this IEnumerable <T> entityList)
{
if (typeof(T).IsClass && typeof(T).IsGenericType)
{
Type entityType = typeof(T);
DataTable entityMappingTable = EntityExtensions.GetEntityMappingTable(entityType);
if (entityList == null || entityList.Count() == 0)
{
return(entityMappingTable);
}
var constructor = entityType.GetConstructors(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.OrderBy(c => c.GetParameters().Length).First();
//取当前构造函数的参数
var parameters = constructor.GetParameters();
IEnumerator <T> enumerator = entityList.GetEnumerator();
while (enumerator.MoveNext())
{
T current = enumerator.Current;
DataRow dataRow = entityMappingTable.NewRow();
foreach (var item in parameters)
{
PropertyInfo p = current.GetType().GetProperty(item.Name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
if (p != null)
{
object obj = p.GetValue(current, null);
if (p.PropertyType.GetUnderlyingType() == typeof(DateTime))
{
obj = ((DateTime)obj).ToString("yyyy-MM-dd HH:mm:ss.fff");
}
dataRow[item.Name] = ((obj == null) ? DBNull.Value : obj);
}
}
enumerator.Disposed();
entityMappingTable.Rows.Add(dataRow);
}
return(entityMappingTable);
}
else
{
Type entityType = typeof(T);
DataTable entityMappingTable = EntityExtensions.GetEntityMappingTable(entityType);
if (entityList == null || entityList.Count() == 0)
{
return(entityMappingTable);
}
IEnumerator <T> enumerator = entityList.GetEnumerator();
while (enumerator.MoveNext())
{
T current = enumerator.Current;
//DataRow dataRow = entityMappingTable.NewRow();
//IEnumerator enumerator2 = entityMappingTable.Columns.GetEnumerator();
//while (enumerator2.MoveNext())
//{
// DataColumn dataColumn = (DataColumn)enumerator2.Current;
// if (!dataColumn.AutoIncrement)
// {
// if (((IEntity)current).ChangedMappingProperties.Keys.Contains(dataColumn.ColumnName))
// {
// object obj = ((IEntity)current).ChangedMappingProperties[dataColumn.ColumnName];
// dataRow[dataColumn.ColumnName] = ((obj == null) ? DBNull.Value : obj);
// }
// }
//}
DataRow dataRow = entityMappingTable.NewRow();
IEnumerator enumerator2 = entityMappingTable.Columns.GetEnumerator();
while (enumerator2.MoveNext())
{
DataColumn dataColumn = (DataColumn)enumerator2.Current;
PropertyInfo p = current.GetType().GetProperty(dataColumn.ColumnName, BindingFlags.Public | BindingFlags.Instance);
if (p != null)
{
object obj = p.GetValue(current, null);
if (p.PropertyType.GetUnderlyingType() == typeof(DateTime))
{
obj = ((DateTime)obj).ToString("yyyy-MM-dd HH:mm:ss.fff");
}
dataRow[dataColumn.ColumnName] = ((obj == null) ? DBNull.Value : obj);
}
}
enumerator.Disposed();
entityMappingTable.Rows.Add(dataRow);
}
enumerator.Disposed();
return(entityMappingTable);
}
}
