序列化.NET日期时间为JSON字符串 [英] Serializing .NET DateTime to Json string

问题描述

我正在写一个自定义的JSON序列化，以提高我的服务的PERF。是的，我也认为Json.NET，servicestack，DataContractJsonSerializer等之前，我做了决定。我的目标是持平，简单的.NET类型和我想避免的一个更大的图书馆的开销。

I'm writing a custom Json serializer to improve the perf of my service. And yes, I did consider Json.NET, servicestack, DataContractJsonSerializer, etc before I made the decision. My objects are flat with simple .NET types and I wanted to avoid the overhead of a much bigger library.

不管怎么说，这里是我遇到一个小问题。我有code序列化的DateTime -

Anyways, here is where I run into a small problem. I have the code to serialize DateTime -

    var epoch = new DateTime(1970, 1, 1, 0, 0, 0);
    sb.Append("\"\\/Date(");
    SerializeNumber((time - epoch).TotalMilliseconds, sb);
    sb.Append(")\\/\"");

和这个伟大的工程，但我不能完全得到它相匹配的默认.NET JSON序列输出。

And this works great, except I can't quite get it to match the default .NET Json serializer in the output.

.NET serializer 
"\\/Date(1328057884253)\\/\"
Custom serializer
"\\/Date(1328057884253.04)\\/\"

嗯，所以我试图让我的转换少precise并切换到的（INT）TotalSeconds而不是毫秒，这给了我这一点 -

Hmm, so I tried making my conversion less precise and switching to (int)TotalSeconds instead of milliseconds and that gives me this -

.NET serializer
"\\/Date(1328054810067)\\/\"
Custom serializer
"\\/Date(1328054810)\\/\"

我猜，这不会是一个大问题，但它会很高兴让我通过对默认的.NET序列化只是理智的单元测试。任何想法？

I'm guessing that this wouldn't be a big deal but it would be nice to get my unit tests passing against the default .NET serializer just for sanity. Any ideas?

感谢。

推荐答案

该物业的 TotalMilliseconds 的类型是双。你可以只投它变成一个长而不是使用TotalSeconds方法，它当然不会返回相同的值...

The Property TotalMilliseconds is of type double. You could just cast it into a long instead of using the TotalSeconds method which of course doesn't return the same value...

var epoch = new DateTime(1970, 1, 1, 0, 0, 0);
sb.Append("\"\\/Date(");
SerializeNumber((long)(time - epoch).TotalMilliseconds, sb);
sb.Append(")\\/\"");

修改的：作为信贷基金在评论中说，preFER 长为 INT ，以避免产能溢出。

edit: as Kosh said in comments, prefer long to int to avoid capacity overflow.

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