IListDataSource Interface
Wrapper over
System.Collections.IList interface to use it as data source:
GrapeCity.ActiveReports.SectionReport.DataSource. This should be used only if performance of current implementation is not enough. This snippet shows how to implement the interface with https://www.nuget.org/packages/FastMember.Signed/1.5.0 Note:
Product here is custom business object.
class Product { public int ProductID { get; set; } public string ProductName { get; set; } } class FastListDataSource : IListDataSource { private readonly System.Collections.Generic.IList < Product > _list; private readonly System.Data.IDataReader _reader; public FastListDataSource(System.Collections.Generic.IList < Product > list) { _list = list; _reader = FastMember.ObjectReader.Create(_list); } public object GetValue(string fieldName, int ordinal) { var index = fieldName.IndexOf('.'); if (index == -1) return _reader.GetValue(ordinal); var fields = fieldName.Split('.'); var target = _reader.GetValue(ordinal); for (int i = 1; i != fields.Length; i++) target = FastMember.ObjectAccessor.Create(target)[fields[i]]; return target; } public int GetOrdinal(string fieldName) { var index = fieldName.IndexOf('.'); if (index == -1) return _reader.GetOrdinal(fieldName); return _reader.GetOrdinal(fieldName.Substring(0, index)); } public System.Collections.IList List => (System.Collections.IList)_list; public System.Data.IDataReader DataReader => _reader; }
public interface IListDataSource
'Declaration
Public Interface IListDataSource
This snippet shows how to implement the interface with https://www.nuget.org/packages/FastMember.Signed/1.5.0 Note:
Product here is custom business object.
class Product
{
public int ProductID { get; set; }
public string ProductName { get; set; }
}
class FastListDataSource : IListDataSource
{
private readonly System.Collections.Generic.IList < Product > _list;
private readonly System.Data.IDataReader _reader;
public FastListDataSource(System.Collections.Generic.IList < Product > list)
{
_list = list;
_reader = FastMember.ObjectReader.Create(_list);
}
public object GetValue(string fieldName, int ordinal)
{
var index = fieldName.IndexOf('.');
if (index == -1)
return _reader.GetValue(ordinal);
var fields = fieldName.Split('.');
var target = _reader.GetValue(ordinal);
for (int i = 1; i != fields.Length; i++)
target = FastMember.ObjectAccessor.Create(target)[fields[i]];
return target;
}
public int GetOrdinal(string fieldName)
{
var index = fieldName.IndexOf('.');
if (index == -1)
return _reader.GetOrdinal(fieldName);
return _reader.GetOrdinal(fieldName.Substring(0, index));
}
public System.Collections.IList List => (System.Collections.IList)_list;
public System.Data.IDataReader DataReader => _reader;
}
