Class RecordWithValueCache

Implements the record that shadows values in table and can gives hints which values were changed in ListChanged event. The new GetOldValue method also gives access to the previous value before a change and can be used for calculating the difference between two values.

Inheritance
System.Object
Element
Record
RecordWithValueCache
Implements
System.IDisposable
System.IComparable
System.ICloneable
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: Syncfusion.Grouping
Assembly: Syncfusion.Grouping.Base.dll
Syntax
public class RecordWithValueCache : Record, IDisposable, IDisposedEvent, IIsDisposedProperty, ITreeTableCounterSource, ITreeTableSummaryArraySource, IContainerElement, IElementTreeTableSource, IElement, IComparable, ICloneable

Constructors

RecordWithValueCache(Table)

Initializes the new instance of the RecordWithValueCache class.

Declaration
public RecordWithValueCache(Table parentTable)
Parameters
Type Name Description
Table parentTable

Parent table.

Methods

CompareAndUpdateValues()

Returns an ArrayList with ChangedFieldInfo objects and updates the values in the record with changes found in underlying datasource. Only fields with a PropertyDescriptor are updated, others (unbound, expression fields) are ignored. The method is implemented only in the RecordWithValueCache class.

Declaration
public override ChangedFieldInfoCollection CompareAndUpdateValues()
Returns
Type Description
ChangedFieldInfoCollection

The collection with detected changes.
Overrides

EnsureValues()

Ensures that record values are cached. The method is implemented only in the RecordWithValueCache class.

Declaration
public override void EnsureValues()
Overrides

GetOldValue(Int32)

Returns the old value for a record.

Declaration
public override object GetOldValue(int fieldIndex)
Parameters
Type Name Description
System.Int32 fieldIndex

Field index.
Returns
Type Description
System.Object

Old value of the record.
Overrides

GetValue(FieldDescriptor)

Gets the value from the underlying datasource.

Declaration
public override object GetValue(FieldDescriptor fieldDescriptor)
Parameters
Type Name Description
FieldDescriptor fieldDescriptor

The field to be retrieved.
Returns
Type Description
System.Object

Returns Value.
Overrides

ResetValues()

Resets cached values.

Declaration
public override void ResetValues()
Overrides

UpdateValues(IEnumerable)

Enumerates through values in the collection of ChangedFieldInfo objects and updates the old and new values in this record.

Declaration
public override void UpdateValues(IEnumerable changedFields)
Parameters
Type Name Description
System.Collections.IEnumerable changedFields

The changed fields.
Overrides

Implements

System.IDisposable
System.IComparable
System.ICloneable