如何提高EF Linq对实体的性能

问题描述

我使用asp.net 4 c#和EF 4.

I use asp.net 4 c# and EF 4.

我正在分析我的应用程序.我有这段代码，结果很昂贵.

I'm profiling my application. I have this code which result expensive.

我想知道您是否知道更好的书写方式.我需要加快速度.

I woud like to know if you know a better way to write it. I need to speed it up.

            string htmlhead = context.CmsOptions.SingleOrDefault(op => op.OptionId == 7).Value;
            if (htmlhead != null)
                uxHtmlHead.Text = htmlhead;
            else
                uxHtmlHead.Text = "No Html Head.";

谢谢

有用的文章 http://weblogs.asp.net/zeeshanhirani/archive/2010/09/20/which-one-is-faster-singleordefault-or-firstordefault.aspx

推荐答案

使用FirstOrDefault() ...找到结果后将立即退出.

Use FirstOrDefault() ... This will exit as soon as it finds a result.

另一方面，SingleOrDefault()在整个集合中搜索单个结果，如果它为查询找到多个结果，则抛出异常

On the other hand SingleOrDefault() searches the entire collection for a single result and throws exception if it finds more than one result for the query

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