开发中需要传递变参,考虑使用 dynamic 还是 Dictionary(准确地说是Dictionary

首先使用以下测试代码:
- public void TestDynamic()
 - {
 - var e = CallDynamic(new { Value = 0 });
 - int v = e.Value;
 - }
 - public void TestDictionary()
 - {
 - var dict = new Dictionary
 (); - dict["Value"] = 0;
 - dict = CallDictionary(dict);
 - int v = (int)dict["Value"];
 - }
 - private dynamic CallDynamic(dynamic test)
 - {
 - int v = test.Value;
 - v++;
 - return new { Value = v };
 - }
 - private Dictionary
 CallDictionary( - Dictionary
 test) - {
 - int v = (int)test["Value"];
 - v++;
 - var dict = new Dictionary
 (); - dict["Value"] = v;
 - return dict;
 - }
 
分别比较运行 1次、10次、100次、1000次、1e4次、1e5次、1e6次 时间
 结果:
其中dynamic列和dynamic2列的数据分别是:
在一次运行中执行一步测试 和 在一次运行中连续执行所有测试
分析测试过程和数据,得到以下结论:
1.dynamic***使用会产生一定的性能损耗
 2.无论是否***使用,使用次数达到一定量级,dynamic性能一定优于Dictionary
 3.一次运行中连续使用dynamic会显著拉低平均性能损耗
考虑到传递变参可能出现多个参数,以上测试不完全。
使用以下代码进行第二阶段实验:
- public void InvokeDynamic()
 - {
 - var e = CallDynamic2(
 - new { Value1 = 0, Value2 = 0L, Value3 = 0f, Value4 = 0.0, Value5 = "test" });
 - int v1 = e.Value1;
 - long v2 = e.Value2;
 - float v3 = e.Value3;
 - double v4 = e.Value4;
 - string v5 = e.Value5;
 - }
 - public void InvokeDictionary()
 - {
 - var dict = new Dictionary
 (); - dict["Value1"] = 0;
 - dict["Value2"] = 0L;
 - dict["Value3"] = 0f;
 - dict["Value4"] = 0.0;
 - dict["Value5"] = "test";
 - dict = CallDictionary2(dict);
 - int v1 = (int)dict["Value1"];
 - long v2 = (long)dict["Value2"];
 - float v3 = (float)dict["Value3"];
 - double v4 = (double)dict["Value4"];
 - string v5 = (string)dict["Value5"];
 - }
 - private dynamic CallDynamic2(dynamic test)
 - {
 - int v1 = test.Value1;
 - long v2 = test.Value2;
 - float v3 = test.Value3;
 - double v4 = test.Value4;
 - string v5 = test.Value5;
 - v1++;
 - v2++;
 - v3++;
 - v4++;
 - v5 += "test";
 - return new { Value1 = v1, Value2 = v2, Value3 = v3, Value4 = v4, Value5 = v5 };
 - }
 - private Dictionary
 CallDictionary2( - Dictionary
 test) - {
 - int v1 = (int)test["Value1"];
 - long v2 = (long)test["Value2"];
 - float v3 = (float)test["Value3"];
 - double v4 = (double)test["Value4"];
 - string v5 = (string)test["Value5"];
 - v1++;
 - v2++;
 - v3++;
 - v4++;
 - v5 += "test";
 - var dict = new Dictionary
 (); - dict["Value1"] = v1;
 - dict["Value2"] = v2;
 - dict["Value3"] = v3;
 - dict["Value4"] = v4;
 - dict["Value5"] = v5;
 - return dict;
 - }
 
结果数据:
***决定选择使用dynamic
有兄弟考虑可能Box损耗了性能导致Dictionary表现不佳,
 专门做了第三阶段实验,对比dynamic和Dictionary
具体数据不贴了,结果是dynamic在100000量级快一倍