c# - How return struct object in MSIL? -


i want set struct field value , return struct instance. code working in classtype, error on structtype.

[create setter] 

    public static dynamicmembersetter createfieldsetter(fieldinfo fieldinfo, type declaringtype = null)     {         if(declaringtype == null) declaringtype = fieldinfo.reflectedtype;         var emit = new emithelper(types.object, dynamicsetmemberparams, declaringtype);         var isstatic = fieldinfo.isstatic;         if(!isstatic)         {             emit.declarelocal(declaringtype);             emit.ldarg_0                 .casttype(declaringtype)                 .stloc_0                 .ldloc_0                 .end();         }         var changetypemethod = typeof(convert).getmethod("changetype", new type[] { types.object, types.type });         var gettypefromhandlemethod = typeof(type).getmethod("gettypefromhandle", new type[] { typeof(runtimetypehandle) });         emit.ldarg_1             .ldtoken(fieldinfo.fieldtype)             .call(gettypefromhandlemethod)             .call(changetypemethod)             .casttype(fieldinfo.fieldtype)             .end();           emit.stfld(isstatic, fieldinfo)             .end();          if(isstatic)         {             emit.ldnull                 .end();         }         else         {             emit.ldloc_0                 .boxifvaluetype(declaringtype)                 .end();         }          emit.ret();         return emit.createdelegate<dynamicmembersetter>();     }

[unit test] 

    [testmethod()]     public void createfieldsettertest()     {         var m = new fields.model() { public = "xs" };         // success         assert.areequal(m, dynamicfactory.createfieldsetter(fields.members.public)(m, "a"));         assert.areequal(m, dynamicfactory.createfieldsetter(fields.members.private)(m, "b"));         assert.areequal("a", m.public);         assert.areequal("b", dynamicfactory.createfieldgetter(fields.members.private)(m));           var stm = new fields.structmodel() { field = "5" };         var v = (fields.structmodel)dynamicfactory.createfieldsetter(stm.gettype().getfield("field"))(stm, "xx");         //- fail，the field "5" value. why?!          assert.areequal("xx", v.field);     }

i want achieve effect, not know how achieve, hoping help.


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