using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.data;
using kaicommon;
using system.reflection;
using kaicommon.orm;
using system.linq.expressions;
using system.reflection.emit;
public delegate void propertysetter(t value);
public delegate t propertygetter();
public partial class tools_testgrid : system.web.ui.page
public void buildgetmethod(testdata td)
#endregion
#region 表示式樹實現
funclmdgetprop; //func
public void lmdget(type entitytype, string propname)
actionlmdsetprop;
public void lmdset(type entitytype, string propname)
#endregion
#region emit動態方法實現
public delegate void setvaluedelegatehandler(testdata entity, object value);
public setvaluedelegatehandler emitsetvalue;
public void buildemitmethod(type entitytype, string propertyname)
, entitytype.module);
// 獲取動態函式的 il 生成器
var il = method.getilgenerator();
// 建立乙個本地變數，主要用於 object type to propety type
var local = il.declarelocal(para.parametertype, true);
// 載入第 2 個引數【(t owner, object value)】的 value
il.emit(opcodes.ldarg_1);
if (para.parametertype.isvaluetype)
else
il.emit(opcodes.stloc, local);// 將上面的拆箱或轉換，賦值到本地變數，現在這個本地變數是乙個與目標函式相同資料型別的字段了。
il.emit(opcodes.ldarg_0); // 載入第乙個引數 owner
il.emit(opcodes.ldloc, local);// 載入本地引數
il.emitcall(opcodes.callvirt, callmethod, null);//呼叫函式
il.emit(opcodes.ret); // 返回
/* 生成的動態函式類似：
* void emitcallable(t owner, object value)
* */
emitsetvalue = method.createdelegate(typeof(setvaluedelegatehandler)) as setvaluedelegatehandler;
}#endregion
protected void page_load(object sender, eventargs e)
timespan ts = datetime.now - time;
this.response.write("基本方法:" + ts.totalmilliseconds + "
");//反射方法
type type = d.gettype();
propertyinfo pi = type.getproperty("name");
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("反射方法:" + ts.totalmilliseconds + "
");//dynamic動態型別方法
dynamic dobj = activator.createinstance();
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("dynamic動態型別方法:" + ts.totalmilliseconds + "
");//泛型委託賦值方法
d.name = -1;
buildsetmethod(d);
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("泛型委託賦值方法:" + ts.totalmilliseconds + "
");this.response.write("v:" + d.name + "
");//泛型委託取值方法
d.name = -1;
buildgetmethod(d);
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("泛型委託取值方法:" + ts.totalmilliseconds + "
");this.response.write("v:" + d.name + "
");//表示式樹賦值方法
d.name = -1;
lmdset(typeof(testdata), "name");
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("表示式樹賦值方法:" + ts.totalmilliseconds + "
");this.response.write("v:" + d.name + "
");//表示式樹取值方法
d.name = -132;
this.lmdget(typeof(testdata), "name");
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("表示式樹取值方法:" + ts.totalmilliseconds + "
");this.response.write("v:" + this.lmdgetprop(d) + "
");//emit動態方法賦值
d.name = -1;
this.buildemitmethod(d.gettype(), "name");
time = datetime.now;
for (int i = 0; i < max; i++)
ts = datetime.now - time;
this.response.write("emit動態方法:" + ts.totalmilliseconds + "
");this.response.write("v:" + d.name + "
");//testdatabind();}}
}public class testdata
}
C 反射賦值
tb projects model new tb projects model.ownerid 123 string fieldname ownerid 欄位名稱 string value 333 type t model.gettype var p t.getproperty fieldname ...
Python中的取值賦值方法
class people object def init self,name self.name name def getname self return self.name def setname self,newname if len newname 5 self.name newname el...
jQuery 取值 賦值的基本方法整理
獲得text.areatext的值 var textval text id attr value 或者 var textval text id val 獲取單選按鈕的值 var valradio input type radio checked val 獲取一組名為 items 的radio被選中項...