c# - 如何按名称而不是整数访问属性？

Question

我一定是遗漏了什么，但我似乎无法弄清楚如何通过名称/字符串获取属性，只能通过整数获取，这可能会改变(属性名称不会)。

您能解释一下我如何通过名称/字符串获取属性吗？字符串“active”尝试产生此错误:

Error   82  The best overloaded method match for 'System.Collections.Generic.List<Amazon.SimpleDB.Model.Attribute>.this[int]' has some invalid argumens

谢谢!

头发加米

using (sdb = AWSClientFactory.CreateAmazonSimpleDBClient(accessKeyID, secretAccessKeyID))
        {
                String selectExpression = string.Format("select * from apps where appid = '{0}'", appID);
                SelectRequest selectRequestAction = new SelectRequest().WithSelectExpression(selectExpression);
                SelectResponse selectResponse = sdb.Select(selectRequestAction);

                if (selectResponse.IsSetSelectResult())
                {
                    SelectResult selectResult = selectResponse.SelectResult;
                    foreach (Item item in selectResult.Item)
                    {
                        //Works fine
                        Amazon.SimpleDB.Model.Attribute id = item.Attribute[1];

                        //How can I do this:
                        Amazon.SimpleDB.Model.Attribute id = item.Attribute["active"];

                    }
                }
                else
                {

                }
            }

Answer 1

您正在尝试访问 System.Collections.Generic.List<T> 就像它是一个关联数组，但它不是。 Enumerable.FirstOrDefault 方法可用于实现类似的目的:

Amazon.SimpleDB.Model.Attribute id = 
   item.Attribute.FirstOrDefault(attr => attr.Name == "active");