c# - Bizarre behavior with custom attributes and GetCustomAttributes -



c# - Bizarre behavior with custom attributes and GetCustomAttributes -

i've been fighting problem hours , not find related on (or google matter).

here's problem: have custom attribute contains object array property.

[system.attributeusage(system.attributetargets.property, allowmultiple = false)] public class property : system.attribute { public object[] parameters { get; set; } public jsonproperty(object[] prms = null) { parameters = prms; } }

and utilize next code read properties:

var customproperties = (property[])currentproperty.getcustomattributes(typeof(property), false);

this works fine following:

[property(parameters = new object[]{}] <...property...>

however, if set null ([property(parameters = null]), error:

system.reflection.customattributeformatexception: 'parameters' property specified not found.

which absurd, because property defined within custom attribute. don't it.

so question is: going on?

--edit

if alter type of property object[] object, assigning null works fine.

--edit add together code

attribute:

[system.attributeusage(system.attributetargets.property, allowmultiple = false)] public class jsonproperty : system.attribute { public object[] parameters { get; set; } public jsonproperty(object[] prms = null) { parameters = prms; } }

class:

public class myclass { [jsonproperty(parameters = null)] public datetime start { get; set; } }

method:

public string getattributes() { type t = myclass.gettype(); // public properties , have been set. var properties = t.getproperties(bindingflags.public | bindingflags.instance) .where(prop => prop.getvalue(this, null) != null); foreach (var prop in properties) { //the error occur on next line. var jsonproperties = (jsonproperty[])prop.getcustomattributes(typeof(jsonproperty), false);

--if didn't understand, seek reading this:

https://social.msdn.microsoft.com/forums/vstudio/en-us/ddebbec6-1653-4502-9802-0b421efec60d/an-unexplicable-customattributeformatexception-from-getcustomattributes?forum=csharpgeneral

i asked question there too.

c# custom-attributes getcustomattributes

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