private static FastSetValueHandler SetValueInvoker(FieldInfo field)
{
//定义一个没有名字的动态方法
DynamicMethod dynamicMethod = new DynamicMethod(String.Empty, null, new Type[] { typeof(Object), typeof(Object) }, field.DeclaringType.Module, true);
ILGenerator il = dynamicMethod.GetILGenerator();
EmitHelper help = new EmitHelper(il);
// 必须考虑对象是值类型的情况，需要拆箱
// 其它地方看到的程序从来都没有人处理
// 值类型是不支持这样子赋值的，暂时没有找到更好的替代方法
help.Ldarg(0)
.CastFromObject(field.DeclaringType)
.Ldarg(1);
//il.Emit(OpCodes.Ldarg_0);
//help.CastFromObject(field.DeclaringType);
//il.Emit(OpCodes.Ldarg_1);
MethodInfo method = GetMethod(field.FieldType);
if (method != null)
{
//// 使用Convert.ToInt32(value)
//il.EmitCall(OpCodes.Call, method, null);
help.Call(method);
}
else
{
//if (field.FieldType.IsValueType)
// il.Emit(OpCodes.Unbox_Any, field.FieldType);
//else
// il.Emit(OpCodes.Castclass, field.FieldType);
help.CastFromObject(field.FieldType);
}
il.Emit(OpCodes.Stfld, field);
il.Emit(OpCodes.Ret);
return((FastSetValueHandler)dynamicMethod.CreateDelegate(typeof(FastSetValueHandler)));
}
private static FastGetValueHandler GetValueInvoker(MethodInfo method)
{
//定义一个没有名字的动态方法
DynamicMethod dynamicMethod = new DynamicMethod(String.Empty, typeof(Object), new Type[] { typeof(Object) }, method.DeclaringType.Module, true);
ILGenerator il = dynamicMethod.GetILGenerator();
EmitHelper help = new EmitHelper(il);
//if (!method.IsStatic) il.Emit(OpCodes.Ldarg_0);
if (!method.IsStatic)
{
help.Ldarg(0).CastFromObject(method.DeclaringType);
}
// 目标方法没有参数
help.Call(method)
.BoxIfValueType(method.ReturnType)
.Ret();
return((FastGetValueHandler)dynamicMethod.CreateDelegate(typeof(FastGetValueHandler)));
}