/// <summary>
/// 比較反射與Dynamic的速度差異
/// </summary>
public string Compare(int times)
{
string resultMessage = string.Empty;
//----------以下是反射
//建立碼表計時器
Stopwatch sw = new Stopwatch();
DyamicSample origin = new DyamicSample();
var addMetohd = typeof(DyamicSample).GetMethod("Add");
sw.Restart();
for (int i = times; i > 0; i--)
{
addMetohd.Invoke(origin, new object[] { 1, 2 });
}
resultMessage += string.Format("反射(Reflect)耗費：{0} 毫秒 \r\n", sw.ElapsedMilliseconds);
sw.Stop();
//----------以下是反射 優化
DyamicSample originPeformance = new DyamicSample();
var addMetohdPeformance = typeof(DyamicSample).GetMethod("Add");
//優化部分-執行委派 FCL 3.0提供以下方法
var delegateObj = (Func <DyamicSample, int, int, int>)Delegate.CreateDelegate(
typeof(Func <DyamicSample, int, int, int>),
addMetohdPeformance
);
sw.Restart();
for (int i = times; i > 0; i--)
{
delegateObj(originPeformance, 1, 2);
}
resultMessage += string.Format("反射優化(Reflect)耗費：{0} 毫秒 \r\n", sw.ElapsedMilliseconds);
sw.Stop();
dynamic dynamicObj = new DyamicSample();
//----------以下是Dynamic
sw.Restart();
for (int i = times; i > 0; i--)
{
dynamicObj.Add(1, 2);
}
resultMessage += string.Format("Dynamic 耗費：{0} 毫秒 \r\n", sw.ElapsedMilliseconds);
sw.Stop();
return(resultMessage);
}
private void Form1_Load(object sender, EventArgs e)
{
//==== A FCL 1.0 沒有Dynamic的時代，必須透過反射取得Method ====
DyamicSample origin = new DyamicSample();
//取得類別 DyamicSample 裡面的Method 名稱叫 Add ※如果沒有就是Null
var addMetohd = typeof(DyamicSample).GetMethod("Add");
//取得到後，可以對該方法進行委派，取得結果
int resulte = (int)addMetohd.Invoke(origin, new object[] { 1, 2 });
//==== B FCL 2.0 以後有了Dynamic 可以更快速、間單的取得Method ===
dynamic origin2 = new DyamicSample();
int result2 = origin2.Add(1, 2);
//上面 A、B 進行 10000000 次的比較，可以展顯出兩者差異
string rateResult = Compare(10000000);
textBox1.Text = rateResult;
}
