performance optimization in C#_c# performance optimization-优快云博客

本文介绍两种提升软件性能的方法：一是使用sealed类以防止派生并利用运行时优化；二是改进数据处理方式，通过使用DataTable的Select方法替代foreach循环来显著提高处理速度。

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1. Used always sealed classes when the class haven't any derived classes.
Some additional infos from this point:

The sealed modifier is primarily used to prevent unintended derivation,
but it also enables certain run-time optimizations. In particular, because a sealed class is
known to never have any derived classes, it is possible to transform virtual function member
invocations on sealed class instances into non-virtual invocations.

sealed类可以提高性能

2. Do not loop in a foreach loop over DataRows use the Select() method of the DataTable.

this code costs tooooo much:

            foreach(DataRow currentDataRow in currentDataTable.Rows)
            {
                newDataTable.ImportRow(currentDataRow);
            }

this code runs over 300 % faster (depends on rows count):

DataRow[] allRows = currentDataTable.Select();

            foreach (DataRow currentDataRow in allRows)
            {
                newDataTable.ImportRow(currentDataRow);
            }