/// <summary>
/// 访问CAST AS表达式。
/// </summary>
/// <param name="explicitCastExpression">表达式。</param>
/// <returns>返回访问后的表达式实例对象。</returns>
public Expression VisitExplicitCast(ExplicitCastExpression explicitCastExpression)
{
_builder.Append("CAST(");
Visit(explicitCastExpression.Operand);
_builder.Append(" AS ");
var typeMapping = _typeMapper.GetMapping(explicitCastExpression.Type);
if (typeMapping == null)
{
throw new InvalidOperationException(string.Format(Resources.UnsupportedType, explicitCastExpression.Type.DisplayName(false)));
}
_builder.Append(typeMapping);
_builder.Append(")");
return(explicitCastExpression);
}