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字典Key性能测试 

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const int time = 1000000;
using (new ProfilerScope("int"))
{
    stopwatch.Start();
    for (int i = 0; i < time; i++)
    {
        1.GetHashCode();
    }
    stopwatch.Stop();
    inttime.text = stopwatch.ElapsedMilliseconds.ToString();
}

using (new ProfilerScope("string"))
{
    stopwatch.Restart();
    for (int i = 0; i < time; i++)
    {
        "test".GetHashCode();
    }
    stopwatch.Stop();
    stringtime.text = stopwatch.ElapsedMilliseconds.ToString();
}

GetHashCode

次数1000000 IL2CPP/Windows/Realease
int 1ms
string 3ms

Dictionary.Get

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Dictionary<int, int> intpairs = new Dictionary<int, int>();
intpairs.Add(1, 1);
Dictionary<string, int> strpairs = new Dictionary<string, int>();
strpairs.Add("test", 1);
const int time = 1000000;
using (new ProfilerScope("int"))
{
    stopwatch.Start();
    for (int i = 0; i < time; i++)
    {
        var res = intpairs[1];
    }
    stopwatch.Stop();
    inttime.text = stopwatch.ElapsedMilliseconds.ToString();
}

using (new ProfilerScope("string"))
{
    stopwatch.Restart();
    for (int i = 0; i < time; i++)
    {
        var res = strpairs["test"];
    }
    stopwatch.Stop();
    stringtime.text = stopwatch.ElapsedMilliseconds.ToString();
}
次数1000000 IL2CPP/Windows/Realease
int 18-19ms
string 21-22ms

Dictionary.Add

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Dictionary<int, int> intpairs = new Dictionary<int, int>();
intpairs.Add(1, 1);
Dictionary<string, int> strpairs = new Dictionary<string, int>();
strpairs.Add("test", 1);
const int time = 1000000;
using (new ProfilerScope("int"))
{
    stopwatch.Start();
    for (int i = 0; i < time; i++)
    {
        intpairs[1] = 1;
    }
    stopwatch.Stop();
    inttime.text = stopwatch.ElapsedMilliseconds.ToString();
}

using (new ProfilerScope("string"))
{
    stopwatch.Restart();
    for (int i = 0; i < time; i++)
    {
        strpairs["test"] = 1;
    }
    stopwatch.Stop();
    stringtime.text = stopwatch.ElapsedMilliseconds.ToString();
}
次数1000000 IL2CPP/Windows/Realease
int 17-18ms
string 20-21ms

key的类型对字典性能影响不大。