Getting Attributes of a Property example in C#

Question

today I'm facing the following problem: Get the especific attribute and his value of some properties.

Suppose this code:

Model:

public class ExampleModel : SBase
{
    [MaxLength(128)]
    public string ... { get; set; }

    [ForeignKey(typeof(Foo))] // Here I wanna get the "typeof(Foo)" which I believe it is the value of the attr
    public int LocalBarId { get; set; }

    [ForeignKey(typeof(Bar))]
    public int LocalFooId { get; set; }

    [ManyToOne("...")]
    public ... { get; set; }
}

Then inside another class I want to get all the "ForeignKey" attribute and their values, and more, their respective properties too, but I have no I ideia how to do this in practice. (At end, would be nice throw all this information into any array.)

I recently was writing a Reflection. The ideia of this was to get only especifics properties. Here's one piece of the code:

foreach (var property in this.allProperties)
{
    var propertyItself = element.GetType().GetProperty(property.Name);
    if (propertyItself.PropertyType != typeof(Int32))
    { continue; }

    if (propertyItself.ToString().Contains("Global") && (int)propertyItself.GetValue(element, null) == 0)
    { // doSomething; }

    else if (propertyItself.ToString().Contains("Local") && (int)propertyItself.GetValue(element, null) == 0)
    { // doSomething; }
}

So basically I was interested only in get properties of type int and if that property was which I was expecting then I'd work on em.

Well, I hope with this conversation, any or someone can help me on, or, only give a basic Idea of how you could do this. Thanks in Advance! :)

Can you describe what is your problem? Are you asking how to get an attribute for a property? — Matan Shahar
– Matan Shahar, Commented Oct 22, 2013 at 19:46

Tim S. · Accepted Answer · 2013-10-22 19:50:57Z

3

var properties = typeof(ExampleModel).GetProperties();
foreach (var property in properties)
{
    foreach (ForeignKeyAttribute foreignKey in
                       property.GetCustomAttributes(typeof(ForeignKeyAttribute)))
    {
        // you now have property's properties and foreignKey's properties
    }
}

answered Oct 22, 2013 at 19:50

Tim S.

56.7k9 gold badges100 silver badges124 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Who's me Over a year ago

Hey @Tim S. I think that's gonna work now, first let me try it out and then I'll be back. Thanks! :D

Azura Over a year ago

This didn't work the first time i tried because my property is set to private, i believe this might be why this answer wasn't marked as accepted, for those who see this later use GetProperties along with the proper BindingFlags. Refer to this answer for more details. Thanks, +1.

Tim S. Over a year ago

@Azura Ah yeah, that's something to pay attention to; OP's question showed only public properties, so I didn't need to specify anything.

Collectives™ on Stack Overflow

Getting Attributes of a Property example in C#

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related