Interface IInterpretsExpressionResult

An object which interprets the result of a TALES expression, for the purposes of TAL.

Namespace: ZptSharp.Tal

Assembly: ZptSharp.Abstractions.dll

Syntax

public interface IInterpretsExpressionResult

Methods

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CoerceResultToBoolean(Object)

Gets a value which is the boolean representation of the specified result, following the rules of boolean type coercion for ZPT. This is used by various TAL attributes to determine whether a value is 'truthy' or 'falsey'.

Declaration

bool CoerceResultToBoolean(object expressionResult)

Parameters

Type	Name	Description
System.Object	expressionResult	An expression result.

Returns

Type	Description
System.Boolean	`true`, if result should be treated as boolean truth, `false` otherwise.

Remarks

This method will return false if the expressionResult is equal to the default of its data-type, otherwise it returns true.

For any data-type, the default of the type is what would be returned by default(T) for that type T.

Examples

For System.String this method returns false if the value is null, otherwise it returns true.

For System.Int32 this method returns false if the value is equal to zero, otherwise it returns true.

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DoesResultAbortTheAction(Object)

Gets a value which indicates whether or not the expression result cancels the current action. See also: AbortZptActionToken.

Declaration

bool DoesResultAbortTheAction(object expressionResult)

Parameters

Type	Name	Description
System.Object	expressionResult	Expression result.

Returns

Type	Description
System.Boolean	`true` if the result cancels the action; otherwise, `false`.