ComputedField Class Reference

Provides access to a ComputedField which is referenced by a DataSource. More...

Public Member Functions
void	Dispose ()
	Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. More...
override string	ToString ()
	Returns a string representation of the instance. More...

Properties
Aggregation	Aggregation [get, set]
	Gets/Sets the aggregation-type of the ComputedField. More...
string	Comment [get, set]
	Gets/Sets the comment for the ComputedField. More...
string	Expression [get, set]
	Gets/Sets the aggregation expression of the ComputedField. More...
string	Filter [get, set]
	Gets/Sets the filter expression of the ComputedField. More...
string	Name [get, set]
	Gets/Sets the name of the ComputedField. More...
ComputedField	Next [get]
	Gets the next ComputedField defined in the DataSource. More...
long	Order [get, set]
	Gets/Sets the evaluation order of the ComputedField. More...

Detailed Description

Provides access to a ComputedField which is referenced by a DataSource.

Overview

With the help of ComputedFields computations can be centralized in the DataSource instead of performing the computations in the FormLayout. For example, you might

• convert the content of an existing field if the DataSource to uppercase,
• remove leading and trailing spaces,
• concatenate multiple fields of the DataSource into a single one,
• or perform numerical computations like computing the VAT.

The result of a ComputedField is available in the DataSource like any other source-field. In the expression of a ComputedField you may refer to multiple fields of the DataSource. It is also possible to use other ComputedFields already defined in the DataSource in the expression.

Aggregation

In addition, ComputedFields support Aggregation (see ComputedField.Aggregation).
Thus it is pretty simple to create serial numbers or to calculate running sums and averages which are not available in a DataSource directly.

Filter Expressions

To exclude specific Records of a DataSource from being considered by the Aggregation use filter expressions.

Member Function Documentation

Dispose()

void Dispose

(

)

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

ToString()

override string ToString

(

)

Returns a string representation of the instance.

Returns

A string representation of the instance

Property Documentation

Aggregation

Aggregation Aggregation

getset

Gets/Sets the aggregation-type of the ComputedField.

Returns

The aggregation-type of the ComputedField

Comment

string Comment

getset

Gets/Sets the comment for the ComputedField.

Returns

The comment for the ComputedField

Expression

string Expression

getset

Gets/Sets the aggregation expression of the ComputedField.

Returns

The aggregation expression of the ComputedField

Filter

string Filter

getset

Gets/Sets the filter expression of the ComputedField.

Using a filter expression allows to exclude specific Records from aggregation.

Returns

The filter expression of the ComputedField

Name

string Name

getset

Gets/Sets the name of the ComputedField.

Returns

The name of the ComputedField

Next

ComputedField Next

get

Gets the next ComputedField defined in the DataSource.

A DataSource stores a list of ComputedField-objects. To retrieve the first ComputedField in the DataSource see DataSource.FirstComputedField.

Returns

The next ComputedField object in the list or null

Order

long Order

getset

Gets/Sets the evaluation order of the ComputedField.

Returns

The evaluation order of the ComputedField