Arithmetica.MathExpressionContext.Define C# (CSharp) Метод

        public void Define(string variable, MathExpression expression)
        {
            try
            {
                _lock.EnterWriteLock();

                // Make sure the variable isn't refering to itself.
                if (_variableFinder.HasVariableDefined(expression, this, variable))
                {
                    string message = string.Format("Variable '{0}' is refering to itself recursively.", variable);
                    throw new MathExpressionException(message);
                }

                if (_lookup.ContainsKey(variable))
                {
                    _lookup[variable] = expression;
                }
                else
                {
                    _lookup.Add(variable, expression);
                }
            }
            finally
            {
                _lock.ExitWriteLock();
            }
        }