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namespace WinEmitIL
{
public static class TypeGenerator
{
public static Type BuildDynamicClass()
{
//AppDomain
AppDomain myDomain = Thread.GetDomain();
//Assembly
AssemblyName myAsmName = new AssemblyName();
myAsmName.Name = "MyDynamicAssembly";
//Assembly generate persistable assembly .
AssemblyBuilder myAsmBuilder =
myDomain.DefineDynamicAssembly(
myAsmName, AssemblyBuilderAccess.RunAndSave);
// DynamicModule.
ModuleBuilder myModBuilder =
myAsmBuilder.DefineDynamicModule(
myAsmName.Name,
myAsmName.Name + ".dll");
// TypeBuilder
TypeBuilder tb =
myModBuilder.DefineType(
"ClassData", TypeAttributes.Public);
ConstructorInfo ctor =CreateCtor(tb);
string propName1 = "Date1";
PropertyBuilder propBld1=
CreateProperty(tb ,propName1,typeof(DateTime));
string propName2 = "Date2";
PropertyBuilder propBld2 =
CreateProperty(tb, propName2, typeof(DateTime));
string mthdName = "CalcMinutes";
Type[] mthdParams = { typeof(DateTime), typeof(DateTime) };
Type returnType = typeof(int);
MethodBuilder mthdBuilder = CalcMinutes(
tb, mthdName,returnType,mthdParams,
propBld2,propBld1);
// note que cette prop est "construite" apres
// la prop Date1,prop Date2 et le method CalcMinutes
string propName3 = "ThirdProperty";
PropertyBuilder propBld3 =
CreateThirdProperty(tb, propName3, typeof(int), propBld2, propBld1, mthdBuilder);
Type retval = tb.CreateType();
myAsmBuilder.Save(myAsmName.Name + ".dll");
return retval;
}
public static ConstructorBuilder CreateCtor(TypeBuilder tb)
{
var ctor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
return ctor;
}
public static PropertyBuilder CreateProperty(
TypeBuilder tb,
string propertyName,
Type propertyType)
{
FieldBuilder fieldBuilder = tb.DefineField(
"_" + propertyName,
propertyType, FieldAttributes.Private);
PropertyBuilder propertyBuilder =
tb.DefineProperty(propertyName,
PropertyAttributes.HasDefault,
propertyType, null);
// get and property set attributes.
MethodAttributes getsetAttr =
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.HideBySig;
//get method
MethodBuilder getPropMthdBldr =
tb.DefineMethod("get_" + propertyName,
getsetAttr,
propertyType, Type.EmptyTypes);
ILGenerator ILout = getPropMthdBldr.GetILGenerator();
ILout.Emit(OpCodes.Ldarg_0);
ILout.Emit(OpCodes.Ldfld, fieldBuilder);
ILout.Emit(OpCodes.Ret);
//set method
MethodBuilder setPropMthdBldr =
tb.DefineMethod("set_" + propertyName,
getsetAttr,
null, new[] { propertyType });
ILout = setPropMthdBldr.GetILGenerator();
ILout.Emit(OpCodes.Ldarg_0);
ILout.Emit(OpCodes.Ldarg_1);
ILout.Emit(OpCodes.Stfld, fieldBuilder);
ILout.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getPropMthdBldr);
propertyBuilder.SetSetMethod(setPropMthdBldr);
return propertyBuilder;
}
public static PropertyBuilder CreateThirdProperty(
TypeBuilder tb,
string propertyName,
Type propertyType,
PropertyBuilder propBld2,
PropertyBuilder propBld1,
MethodBuilder mthdBld)
{
PropertyBuilder propertyBuilder =
tb.DefineProperty(propertyName,
PropertyAttributes.HasDefault,
propertyType, null);
// get and property set attributes.
MethodAttributes getsetAttr =
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.HideBySig;
//get method
MethodBuilder getPropMthdBldr =
tb.DefineMethod("get_" + propertyName,
getsetAttr,
propertyType, Type.EmptyTypes);
ILGenerator ILout = getPropMthdBldr.GetILGenerator();
LocalBuilder date2 = ILout.DeclareLocal(typeof(DateTime));
LocalBuilder date1 = ILout.DeclareLocal(typeof(DateTime));
ILout.Emit(OpCodes.Ldarg, 0); // // adress of first argument(aka tb)
ILout.Emit(OpCodes.Call, propBld2.GetGetMethod());
ILout.Emit(OpCodes.Stloc, date2);// store in local variable
ILout.Emit(OpCodes.Ldarg,0);
ILout.Emit(OpCodes.Call,propBld1.GetGetMethod());
ILout.Emit(OpCodes.Stloc, date1);// store in local variable
ILout.Emit(OpCodes.Ldloc, date2); // value of date2
ILout.Emit(OpCodes.Ldloc, date1); // value of date2
ILout.Emit(OpCodes.Call, mthdBld);//call method on instance class(aka tb)
ILout.Emit(OpCodes.Ret); // retourne la valeur calculée qui est toujours sur la pile
//pas de set method
propertyBuilder.SetGetMethod(getPropMthdBldr);
return propertyBuilder;
}
public static MethodBuilder CalcMinutes(
TypeBuilder tb,
string mthdName,
Type returnType,
Type[] mthdParams,
PropertyBuilder propBld2,
PropertyBuilder propBld1)
{
//method attributes
MethodAttributes mthdAttr = MethodAttributes.Public | MethodAttributes.Static;
MethodBuilder mthdBuilder = tb.DefineMethod(
mthdName, mthdAttr,returnType , mthdParams) ;
ILGenerator ILout = mthdBuilder.GetILGenerator();
LocalBuilder date2 = ILout.DeclareLocal(typeof(DateTime));
LocalBuilder date1 = ILout.DeclareLocal(typeof(DateTime));
LocalBuilder tms = ILout.DeclareLocal(typeof(TimeSpan));
LocalBuilder minutesDays = ILout.DeclareLocal(typeof(int));
LocalBuilder minutesHours = ILout.DeclareLocal(typeof(int));
LocalBuilder minutes = ILout.DeclareLocal(typeof(int));
LocalBuilder num = ILout.DeclareLocal(typeof(int));
ILout.Emit(OpCodes.Ldarga,0); // adress of first argument(aka tb)
ILout.Emit(OpCodes.Call, propBld2.GetGetMethod());
ILout.Emit(OpCodes.Stloc, date2); // store in local variable
ILout.Emit(OpCodes.Ldarga, 0); // adress of first argument(aka tb)
ILout.Emit(OpCodes.Call, propBld1.GetGetMethod());
ILout.Emit(OpCodes.Stloc, date1);
ILout.Emit(OpCodes.Ldarga, date2);// adress of date2
ILout.Emit(OpCodes.Ldarg, date1); // value of date1
ILout.Emit(OpCodes.Call, typeof(DateTime).
GetMethod("Subtract", new Type[] { typeof(DateTime) }));
ILout.Emit(OpCodes.Stloc, tms); // store in local variable of type TimeSpan
// calc minutesDays
ILout.Emit(OpCodes.Ldloca, tms);// adress of tms
ILout.Emit(OpCodes.Call, typeof(TimeSpan).
GetProperty("Days", typeof(int)).GetGetMethod());
ILout.Emit(OpCodes.Ldc_I4, 3600);
ILout.Emit(OpCodes.Mul);
ILout.Emit(OpCodes.Stloc, minutesDays);
//calc minutesHours
ILout.Emit(OpCodes.Ldloca, tms);
ILout.Emit(OpCodes.Call, typeof(TimeSpan).
GetProperty("Hours", typeof(int)).GetGetMethod());
ILout.Emit(OpCodes.Ldc_I4, 60);
ILout.Emit(OpCodes.Mul);
ILout.Emit(OpCodes.Stloc, minutesHours);
// calc minutes
ILout.Emit(OpCodes.Ldloca, tms);
ILout.Emit(OpCodes.Call, typeof(TimeSpan).
GetProperty("Minutes", typeof(int)).GetGetMethod());
ILout.Emit(OpCodes.Stloc, minutes);
ILout.Emit(OpCodes.Ldloc, minutesDays);// load value of local variale in stack
ILout.Emit(OpCodes.Ldloc, minutesHours);// etc...
ILout.Emit(OpCodes.Add);
ILout.Emit(OpCodes.Ldloc, minutes);
ILout.Emit(OpCodes.Add);
ILout.Emit(OpCodes.Ret);
return mthdBuilder;
}
} |
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