TLinqDataTableState<T> Class

This class implements support for Linq queries in FlexCelReport. Inherit this class if you want to implement some non-standard Linq query provider. For normal cases, you don't need to do anything since FlexCel already implements a descendant of this class with the default functionality.

Syntax

Namespace: FlexCel.Report

public abstract class TLinqDataTableState<T>: VirtualDataTableState, IDisposable, ILinqDataTableState

Type Parameters

Type Parameter	Description
T	Type of the object that will be enumerated.

Constructors

Name	Description
TLinqDataTableState	Creates a new LinqDataTableState.

Methods

Name	Description
Dispose	Override this method on derived classes.
Eof	Returns true when at the end of the table.
FilteredRowCount	This method will be called when a Split master wants to know how many records its detail has. For example, if the detail has 30 records and the split is at 10, the Split master will call this method to find out that it has to return 3 on its own record count. You need to filter the data here depending on the master detail relationships, but not on the splitLink.
GetDetail<Q>	Returns a detail table. This is used in master-detail relationships to get the nested table for the detail band.
GetFilterAction	This method returns a function that can be used to filter the data. This implementation calls SqlFilter when rowFilter starts with "@", or calls [SimpleFilter](SimpleFilter.md) when rowFilter doesn't start with "@". You might want to replace this method by a different one that filters in a different way.
GetValue	Overloaded GetValue(Int32) GetValue(Int32, Int32)
MoveFirst	This method is called when we want to move to the first record. You can always know the current record with VirtualDataTableState.Position
MoveMasterRecord	This method will be called each time that the master datasource moves its position. Use it to filter the data returned if this is used on a master-detail relationship.
MoveNext	This method is called when we want to move to the next record. You can always know the current record with VirtualDataTableState.Position
SimpleFilter	This method is called by GetFilterAction when the rowFilter doesn't start with "@"\.<br />It will do a simple parse of the rowFilter string, allowing "AND" "OR" "()" and equality comparisons.
SortData	Sorts the data according to SortStr.
SortDataByField<Q>	This method is used by the current SortData implementation, and it creates an expression to sort the data.
SqlFilter	This method is called by GetFilterAction when the rowFilter starts with "@"\. When overriding [GetFilterAction](GetFilterAction.md) you might want to call this method if rowfilter starts with "@"\.<br /><br /><br />This implementation tries to find a "Where(string)" method in the data and call it.
TryAggregate	This method is used by the "AGGREGATE" tag in a FlexCel report to calculate the maximum/minimum/average/etc of the values in the table. If you don't implement this method, FlexCel will still calculate those values by looping through the dataset, but if you have a faster way to do it (like with a "select max(field) from table") then implement this method and return true.

Properties