Class PipeExpressionEvaluator

An implementation of IEvaluatesExpression which evaluates TALES 'pipe' expressions.

Inheritance
System.Object
PipeExpressionEvaluator
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: ZptSharp.Expressions.PipeExpressions
Assembly: ZptSharp.dll
Syntax
public class PipeExpressionEvaluator : IEvaluatesExpression
Remarks

A pipe expression is essentially an invocation of a System.Func<T, TResult> upon an existing variable. The function delegate's result/output type is always System.Object, although the input parameter may vary in type.

The result of the expression is the output of the function delegate, when executed against the specified variable. Pipe expressions are most useful for transforming or formatting values for output.

Constructors

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PipeExpressionEvaluator(IEvaluatesExpression, IEvaluatesPipeDelegate)

Initializes a new instance of PipeExpressionEvaluator.

Declaration
public PipeExpressionEvaluator(IEvaluatesExpression evaluator, IEvaluatesPipeDelegate delegateEvaluator)
Parameters
Type Name Description
IEvaluatesExpression evaluator

An expression evaluator.
IEvaluatesPipeDelegate delegateEvaluator

A delegate evaluator.

Methods

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EvaluateExpressionAsync(String, ExpressionContext, CancellationToken)

Evaluates the expression asynchronously and returns the result.

Declaration
public Task<object> EvaluateExpressionAsync(string expression, ExpressionContext context, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String expression

The expression string.
ExpressionContext context

The expression context.
System.Threading.CancellationToken cancellationToken

An optional cancellation token.
Returns
Type Description
System.Threading.Tasks.Task<System.Object>

The expression result.

Implements

Extension Methods