public static DataTable GenerateEmptyDataTable
(
Type type
, bool needDefinitionAttributeProcess = false
)
{
MemberAdditionalDefinitionAttribute attribute = null;
var members = TypeHelper
.GetModelMembers(type)
.OrderBy
(
(x) =>
{
int r = int.MinValue;
attribute = x
.GetCustomAttributes
(typeof(MemberAdditionalDefinitionAttribute), true)
.FirstOrDefault() as MemberAdditionalDefinitionAttribute;
if (attribute != null)
{
if (attribute.DataTableColumnID.HasValue)
{
r = attribute.DataTableColumnID.Value;
}
}
return(r);
}
);
DataTable dataTable = null;
DataColumnCollection dataColumnsCollection = null;
foreach (var x in members)
{
if (dataTable == null)
{
dataTable = new DataTable();
if (dataColumnsCollection == null)
{
dataColumnsCollection = dataTable.Columns;
}
}
var dataColumnName = x.Name;
if (needDefinitionAttributeProcess)
{
if (attribute != null)
{
if (!attribute.DataTableColumnName.IsNullOrEmptyOrWhiteSpace())
{
dataColumnName = attribute.DataTableColumnName;
}
}
}
Type dataColumnType = null;
if (x is FieldInfo)
{
var fieldInfo = x as FieldInfo;
dataColumnType = fieldInfo.FieldType;
}
else if (x is PropertyInfo)
{
var propertyInfo = x as PropertyInfo;
dataColumnType = propertyInfo.PropertyType;
}
if (needDefinitionAttributeProcess)
{
if (attribute != null)
{
if (attribute.DataTableColumnDataType != null)
{
dataColumnType = attribute.DataTableColumnDataType;
}
}
}
if (dataColumnType.IsNullableType())
{
dataColumnType = TypeHelper.GetNullableUnderlyingType(dataColumnType);
}
dataColumnsCollection
.Add
(
dataColumnName
, dataColumnType
);
}
return(dataTable);
}
public static IEnumerable <TEntry> GetEnumerable <TEntry>
(
IDataReader dataReader
, bool needDefinitionAttributeProcess = false
)
where TEntry : new()
{
var type = typeof(TEntry);
MemberAdditionalDefinitionAttribute attribute = null;
var members = TypeHelper
.GetModelMembers(type)
.Select
(
(x) =>
{
attribute =
x
.GetCustomAttributes
(typeof(MemberAdditionalDefinitionAttribute), true)
.FirstOrDefault() as MemberAdditionalDefinitionAttribute;
return(x);
}
);
while (dataReader.Read())
{
TEntry entry = new TEntry();
foreach (var x in members)
{
var dataColumnName = x.Name;
if (needDefinitionAttributeProcess)
{
if (attribute != null)
{
if
(
!attribute
.DataTableColumnName
.IsNullOrEmptyOrWhiteSpace()
)
{
dataColumnName = attribute.DataTableColumnName;
}
}
}
var setter = DynamicExpressionTreeHelper
.CreateMemberSetter <TEntry, object>
(
x.Name
);
setter
(
entry
, dataReader[dataColumnName]
);
}
yield
return
(entry);
}
}
