Class Evaluator

Evaluator is an expression evaluator, it includes variable assignment and support for dataset fields, function calls are also supported

Inheritance

object

MarshalByRefObject

Component

Evaluator

Implements

IComponent

IDisposable

Inherited Members

Component.Dispose()

Component.GetService(Type)

Component.ToString()

Component.CanRaiseEvents

Component.Events

Component.Site

Component.Container

Component.DesignMode

Component.Disposed

MarshalByRefObject.GetLifetimeService()

MarshalByRefObject.InitializeLifetimeService()

MarshalByRefObject.MemberwiseClone(bool)

object.GetType()

object.MemberwiseClone()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Namespace: Reportman.Reporting

Assembly: Reportman.Reporting.dll

Syntax

public class Evaluator : Component, IComponent, IDisposable

Constructors

Evaluator()

Declaration

public Evaluator()

Evaluator(IContainer)

Declaration

public Evaluator(IContainer container)

Parameters

Type	Name	Description
IContainer	container

Fields

Language

Language property is used in funtions returning localized strings

Declaration

public int Language

Field Value

Type	Description
int

Properties

AliasList

AliasList is used to provide access to dataset fields to the Evaluator

Declaration

public DatasetAlias AliasList { get; set; }

Property Value

Type	Description
DatasetAlias

Expression

Declaration

public string Expression { get; set; }

Property Value

Type	Description
string

Identifiers

Declaration

public EvalIdentifiers Identifiers { get; }

Property Value

Type	Description
EvalIdentifiers

Result

This property contains the last result of the evaluation of an expression

Declaration

public Variant Result { get; }

Property Value

Type	Description
Variant

Methods

AddIden(string, EvalIdentifier)

Addd any identifier object to the evaluator

Declaration

public void AddIden(string name1, EvalIdentifier iden)

Parameters

Type	Name	Description
string	name1	Identifier name
EvalIdentifier	iden	Identifier object

AddVariable(string, EvalIdentifier)

Add a variable to the evaluator

Declaration

public void AddVariable(string name1, EvalIdentifier iden)

Parameters

Type	Name	Description
string	name1	Variable name
EvalIdentifier	iden	Identifier object, usually a IdenVariable typed object

CheckSyntax(string)

Provide syntax checking utility

Declaration

public void CheckSyntax(string atext)

Parameters

Type	Name	Description
string	atext

Dispose(bool)

Cleanup resources

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
bool	disposing

Overrides

Component.Dispose(bool)

Evaluate()

Declaration

public Variant Evaluate()

Returns

Type	Description
Variant

EvaluateText(string)

Declaration

public Variant EvaluateText(string text)

Parameters

Type	Name	Description
string	text

Returns

Type	Description
Variant

GetStreamFromExpression(string)

Obtains a memory stream from an expression resulting in a file name path or a database field

Declaration

public MemoryStream GetStreamFromExpression(string expre)

Parameters

Type	Name	Description
string	expre	Expression to evaluate

Returns

Type	Description
MemoryStream	A Memory stream or null if the result is not a stream

NewVariable(string, Variant)

Create a new variable with an initial value

Declaration

public IdenVariable NewVariable(string name1, Variant valueIni)

Parameters

Type	Name	Description
string	name1	Variable name
Variant	valueIni	Initial value

Returns

Type	Description
IdenVariable

SearchIdentifier(string)

Looks for an identifier, returns null if not found

Declaration

public EvalIdentifier SearchIdentifier(string idenname)

Parameters

Type	Name	Description
string	idenname	Identifier name

Returns

Type	Description
EvalIdentifier	Identifier found or null

Events

OnDatasetNeeded

Declaration

public event DataNeededEvent OnDatasetNeeded

Event Type

Type	Description
DataNeededEvent

Implements

IComponent

IDisposable