Class EvaluationHelper

Namespace

NCalc.Helpers

Assembly

NCalc.Core.dll

Provides helper methods for evaluating expressions.

public static class EvaluationHelper

Inheritance

object

EvaluationHelper

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?, ExpressionContextBase)

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, ExpressionContextBase context)

Parameters

rightValue object

The right operand.

leftValue object

The left operand.

context ExpressionContextBase

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?, ExpressionContextBase)

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

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

Parameters

leftValue object

The left operand.

rightValue object

The right operand.

context ExpressionContextBase

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.

Like(string, string, ExpressionContextBase)

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

[Obsolete]
public static bool Like(string value, string pattern, ExpressionContextBase context)

Parameters

value string

The string to be compared against the pattern.

pattern string

The pattern to match. '%' matches zero or more characters, and '_' matches exactly one character.

context ExpressionContextBase

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?, ExpressionContextBase)

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

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

Parameters

leftValue object

The left operand.

rightValue object

The right operand.

context ExpressionContextBase

The evaluation context.

Returns

object

The result of the addition or string concatenation.

Unary(UnaryExpression, object?, ExpressionContextBase)

Evaluates a unary expression.

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

Parameters

expression UnaryExpression

The unary expression to evaluate.

result object

The result of evaluating the operand of the unary expression.

context ExpressionContextBase

The evaluation context.

Returns

object

The result of the unary operation.

Exceptions

InvalidOperationException

Thrown when the unary expression type is unknown.