c# - FieldBuilder - Ho do you set the default value? -

i'm using typebuilder create types @ runtime, can't seem figure out how set default value of field.

for example, wanted create following layout @ runtime, using typebuilder, how set default value of 'm_number' (to 64)?

    public class dynamictype1 {     private int m_number = 64;      public int number     {         { return m_number; }         set { m_number = value; }     } } 

here code use create property, ... how set field have value of 'defaultvalue'

void addproperty(string name, type type, object defaultvalue)     {         // add private field of type          fieldbuilder fieldbuilder = m_typebuilder.definefield("m_" + name.tolower(), type, fieldattributes.private);          // define property gets , sets private field. last argument of defineproperty null, because          // property has no parameters. (if don't specify null, must specify array of type objects. parameterless property,          // use built-in array no elements: type.emptytypes)         propertybuilder propertybuilder = m_typebuilder.defineproperty(name, propertyattributes.hasdefault, type, null);          // property "set" , property "get" methods require special set of attributes.         methodattributes getsetattr = methodattributes.public | methodattributes.specialname | methodattributes.hidebysig;          // define "get" accessor method. method returns value , has no arguments. (note null           // used instead of types.emptytypes)         methodbuilder getaccessormethodbuilder = m_typebuilder.definemethod("get_" + name, getsetattr, type, type.emptytypes);          // instance property, argument 0 instance. load instance, load private          //field , return, leaving field value on stack.         ilgenerator numbergetil = getaccessormethodbuilder.getilgenerator();         numbergetil.emit(opcodes.ldarg_0);         numbergetil.emit(opcodes.ldfld, fieldbuilder);         numbergetil.emit(opcodes.ret);          // define "set" accessor method number, has no return type , takes 1 argument of type t.         methodbuilder setaccessormethodbuilder = m_typebuilder.definemethod("set_" + name, getsetattr, null, new type[] { type });          // load instance , argument, store  argument in field.         ilgenerator numbersetil = setaccessormethodbuilder.getilgenerator();         numbersetil.emit(opcodes.ldarg_0);         numbersetil.emit(opcodes.ldarg_1);         numbersetil.emit(opcodes.stfld, fieldbuilder);         numbersetil.emit(opcodes.ret);          // last, map "get" , "set" accessor methods propertybuilder. property complete.          propertybuilder.setgetmethod(getaccessormethodbuilder);         propertybuilder.setsetmethod(setaccessormethodbuilder);     } 

when in doubt, ask roslyn, in il mode :-) http://goo.gl/nebcep

the default field set in constructor(s) of object:

.method public hidebysig specialname rtspecialname      instance void .ctor () cil managed  {     // method begins @ rva 0x2061     // code size 15 (0xf)     .maxstack 8      il_0000: ldarg.0     il_0001: ldc.i4.s 64     il_0003: stfld int32 dynamictype1::m_number 

note if there multiple constructors, seems constructors chain other constructors of same class don't set value, while constructors don't chain other constructor of same class set. see expanded example: http://goo.gl/8y90ku