/// <summary>
/// When overridden by a derived class, this method evaluates the expression
/// within the provided context.
/// </summary>
/// <param name="context">The context for the evaluation of the expression, providing
/// access to the system or to the execution context.</param>
/// <remarks>
/// <para>
/// This method is only executed is <see cref="CanEvaluate"/> is <c>true</c>, and the
/// override method can reduce this expression to a simpler form.
/// </para>
/// </remarks>
/// <returns>
/// Returns a new <seealso cref="SqlExpression"/> that is the result of the
/// evaluation of this expression, within the context given.
/// </returns>
/// <exception cref="ExpressionEvaluateException">
/// If any error occurred while evaluating the expression.
/// </exception>
public virtual SqlExpression Evaluate(EvaluateContext context)
{
var visitor = new ExpressionEvaluatorVisitor(context);
return visitor.Visit(this);
}
/// <summary>
/// When overridden by a derived class, this method evaluates the expression
/// within the provided context.
/// </summary>
/// <param name="context">The context for the evaluation of the expression, providing
/// access to the system or to the execution context.</param>
/// <remarks>
/// <para>
/// This method is only executed is <see cref="CanEvaluate"/> is <c>true</c>, and the
/// override method can reduce this expression to a simpler form.
/// </para>
/// </remarks>
/// <returns>
/// Returns a new <seealso cref="SqlExpression"/> that is the result of the
/// evaluation of this expression, within the context given.
/// </returns>
/// <exception cref="ExpressionEvaluateException">
/// If any error occurred while evaluating the expression.
/// </exception>
public virtual SqlExpression Evaluate(EvaluateContext context)
{
var visitor = new ExpressionEvaluatorVisitor(context);
return(visitor.Visit(this));
}