如何提升asp.net的性能？

Question

Q:

在我以前使用asp.net的工作中，我考虑的只是如何完成所需的任务，不在乎 性能，但是现在我想，在我已经学到很多有关如何在某种程度上处理这种语言的知识之后，我应该专注于性能问题。 当我学习概念和语法时，我的老师告诉我，性能问题并不那么重要，首要任务始终是及时完成所需的任务，而且硬件和网络基础设施的革命将为你解决代码中的巨大性能差距！ 现在，我想了解有关asp.net和整个Web中性能问题的一些技巧。如果有关于此想法的示例，我将不胜感激。 例如，有人告诉我：

int count = dataTable.Rows.Count;
for(int i = 0 ; i<count ; i++)
{
   //Do some thing
} 

比这个更重要：

for(int i = 0 ; i<dataTable.Rows.Count ; i++)
{
   //Do some thing
} 

Answer 1

The first version can be more performant, since you don't re-evaluate dataTable.Rows.Count in every iteration of the loop.

If every call to dataTable.Rows.Count is expensive (and potentially can be), the first version will indeed be better.

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As for general tips about performance:

• Always decide what performance means for you (latency? throughput? something else?)
• Always figure out how you measure it.
• Figure out when your code is performant enough (when are you done).
• Profile your code to find the worst performance points.
• Fix these and reprofile.