在asp.net缓存密钥长度 [英] Cache key length in asp.net

问题描述

我正在调查MVC3源碰上了如下（OutputCacheAttribute.cs）被称为生成密钥用于输出缓存时：

I was investigating the MVC3 source and came across the following (in OutputCacheAttribute.cs) which is called when generating a key to use for output caching:

        // The key is typically too long to be useful, so we use a cryptographic hash
        // as the actual key (better randomization and key distribution, so small vary
        // values will generate dramtically different keys).
        using (SHA256 sha = SHA256.Create()) {
            return Convert.ToBase64String(sha.ComputeHash(Encoding.UTF8.GetBytes(uniqueIdBuilder.ToString())));
        }

该评论说，使用哈希是必需的，因为关键是典型过长是有益的。任何人都可以揭示出这个光与推荐缓存键的最大长度在asp.net？

The comment says that the use of a hash is required because "The key is typically too long to be useful". Can anyone shed light on this and recommend a maximum length for cache keys in asp.net?

推荐答案

长度实际上并不事情，因为它转换为一个散列。
这适用于MVC和ASP.NET。

The length doesn't actually matter as it is converted to a hash. This applies to MVC and ASP.NET.

<一个href=\"http://stackoverflow.com/questions/2330621/maximum-length-of-cache-keys-in-httpruntime-cache-object\">Maximum在HttpRuntime.Cache缓存键的长度反对呢？

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