c# - .NET Create struct property getter delegate -

i have method create property getter delegate:

private static delegate createpropertygetter(propertyinfo propertyinfo)     {         methodinfo propertygetter = propertyinfo.getgetmethod();          dynamicmethod dyngetter = new dynamicmethod                                   (                                       string.concat("dm$member_getter_", propertyinfo.name),                                       propertyinfo.propertytype,                                       new type[1] { propertyinfo.declaringtype },                                       propertyinfo.declaringtype,                                       true                                   );          ilgenerator ilgen = dyngetter.getilgenerator();          ilgen.emit(opcodes.ldarg_0);          ilgen.emitcall(propertyinfo.declaringtype.isvaluetype ? opcodes.call : opcodes.callvirt, propertygetter, null);          ilgen.emit(opcodes.ret);          return dyngetter.createdelegate(typeof(membergetter<,>).makegenerictype(propertyinfo.declaringtype, propertyinfo.propertytype));     } 

this code work fine classes, structs throw argumentnullexception when try property value.

try changing line this:

ilgen.emit(opcodes.ldarg_0); 

to this:

ilgen.emit(propertyinfo.declaringtype.isvaluetype ? opcodes.ldarga : opcodes.ldarg, 0); 

this loads address of first argument (located on stack), required calling instance methods on structures.
however, i'd prefer using system.linq.expressions instead of emit.