Class EvaluationHelper<TExpressionContext>

Namespace

NCalc.Helpers

Assembly

NCalc.Core.dll

Provides helper methods for evaluating expressions.

public static class EvaluationHelper<TExpressionContext> where TExpressionContext : ExpressionContextBase

Type Parameters

TExpressionContext

Inheritance

object

EvaluationHelper<TExpressionContext>

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Methods

In(object?, object?, TExpressionContext)

Determines if the left value is contained within the right value, which must be either an enumerable or a string.

public static bool In(object? rightValue, object? leftValue, TExpressionContext context)

Parameters

rightValue object

The right operand.

leftValue object

The left operand.

context TExpressionContext

The evaluation context.

Returns

bool

True if the left value is contained within the right value, otherwise false.

Exceptions

NCalcEvaluationException

Thrown when the right value is not an enumerable or a string.

Like(object?, object?, TExpressionContext)

Determines whether a specified string matches a pattern using SQL-like wildcards.

public static bool Like(object? leftValue, object? rightValue, TExpressionContext context)

Parameters

leftValue object

The left operand.

rightValue object

The right operand.

context TExpressionContext

The context containing options for the comparison.

Returns

bool

true if the value matches the pattern; otherwise, false.

Remarks

The comparison is case-insensitive if the CaseInsensitiveStringComparer flag is set in the context.

Plus(object?, object?, TExpressionContext)

Adds two values, with special handling for string concatenation based on the context options.

public static object? Plus(object? leftValue, object? rightValue, TExpressionContext context)

Parameters

leftValue object

The left operand.

rightValue object

The right operand.

context TExpressionContext

The evaluation context.

Returns

object

The result of the addition or string concatenation.

Unary(UnaryExpression, object?, TExpressionContext)

Evaluates a unary expression.

public static object? Unary(UnaryExpression expression, object? result, TExpressionContext context)

Parameters

expression UnaryExpression

The unary expression to evaluate.

result object

The result of evaluating the operand of the unary expression.

context TExpressionContext

The evaluation context.

Returns

object

The result of the unary operation.

Exceptions

InvalidOperationException

Thrown when the unary expression type is unknown.