/// <summary>
/// Dispatches to the specific visit method for this node type. For
/// example, <see cref="MethodCallExpression" /> will call into
/// <see cref="ExpressionVisitor.VisitMethodCall" />.
/// </summary>
/// <param name="visitor">The visitor to visit this node with.</param>
/// <returns>The result of visiting this node.</returns>
/// <remarks>
/// This default implementation for <see cref="ExpressionType.Extension" />
/// nodes will call <see cref="ExpressionVisitor.VisitExtension" />.
/// Override this method to call into a more specific method on a derived
/// visitor class of ExpressionVisitor. However, it should still
/// support unknown visitors by calling VisitExtension.
/// </remarks>
protected internal virtual Expression Accept(ExpressionVisitor visitor)
{
if (visitor == null)
{
throw new ArgumentNullException(nameof(visitor));
}
return(visitor.VisitExtension(this));
}
/// <summary>
/// Dispatches to the specific visit method for this node type. For
/// example, <see cref="MethodCallExpression"/> will call into
/// <see cref="ExpressionVisitor.VisitMethodCall"/>.
/// </summary>
/// <param name="visitor">The visitor to visit this node with.</param>
/// <returns>The result of visiting this node.</returns>
/// <remarks>
/// This default implementation for <see cref="ExpressionType.Extension"/>
/// nodes will call <see cref="ExpressionVisitor.VisitExtension"/>.
/// Override this method to call into a more specific method on a derived
/// visitor class of ExprressionVisitor. However, it should still
/// support unknown visitors by calling VisitExtension.
/// </remarks>
protected internal virtual Expression Accept(ExpressionVisitor visitor)
{
return(visitor.VisitExtension(this));
}
/// <summary>
/// Accepts the specified visitor, by default dispatching to <see cref="ExpressionVisitor.VisitExtension"/>.
/// Inheritors of the <see cref="ExtensionExpression"/> class can override this method in order to dispatch to a specific Visit method.
/// </summary>
/// <param name="visitor">The visitor whose Visit method should be invoked.</param>
/// <returns>The <see cref="Expression"/> returned by the visitor.</returns>
/// <remarks>
/// Overriders can test the <paramref name="visitor"/> for a specific interface. If the visitor supports the interface, the extension expression
/// can dispatch to the respective strongly-typed Visit method declared in the interface. If it does not, the extension expression should call
/// the base implementation of <see cref="Accept"/>, which will dispatch to <see cref="ExpressionVisitor.VisitExtension"/>.
/// </remarks>
protected virtual Expression Accept (ExpressionVisitor visitor)
{
ArgumentUtility.CheckNotNull ("visitor", visitor);
return visitor.VisitExtension (this);
}
