Using Custom Attributes from Within Constructor - C#

Question

I am wanting to access the custom attributes on a Field in the class. I want to access the attributes placed on the field during the fields constructor. Is this possible?

Edit 06/28/09 Something like the below pseudo code

class SpecialInt



{ 

int _intVal; 
int _maxVal; 
public SpecialInt() 
{ 
    //Get attribute for the instantiated specialint 
    _maxVal = GetAttribute("MaxValue") 


} 
} 

class main() 

{

[MaxValue(100)] 
SpecialInt sInt; 
public main() 
{ 
    sInt = new SpecialInt() 
}

}

JaredPar · Accepted Answer · 2009-06-26 20:46:12Z

6

Sure this is possible. Attributes are stored in Metadata and this is easily accessible during construction of an object.

public class Foo { 
  [Something]
  public int Field1;

  public Foo() {
    FieldInfo fi = typeof(Foo).GetField("Field1");
    SomethingAttribute si = (SomethingAttribute)fi.GetCustomAttribute(typeof(SomethingAttribute),false)[0];
    // grab any Custom attribute off of Fiield1 here
  }
}

answered Jun 26, 2009 at 20:46

JaredPar

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1 Comment

user129647 Over a year ago

What I sort of want to be able to do. class SpecialInt { int _intVal; int _maxVal; public SpecialInt() { //Get attribute for the instantiated specialint _maxVal = GetAttribute("MaxValue") } } class main() { [MaxValue(100)] SpecialInt sInt; public main() { sInt = new SpecialInt() } } And have the constructor for SpecialInt know the attributes applied to it.

vgru · Accepted Answer · 2009-06-26 20:46:35Z

1

You can test them from anywhere. Attributes are inserted into the metadata for the type when you compile it. A type doesn't need to be instantiated to access field properties.

answered Jun 26, 2009 at 20:46

vgru

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