CODEWITHSUNDEEP
c#reflectioncustom-attributes
xoail
xoail

Reputation: 3064

C# Method Attributes

Is there a way to achieve this without injection? Topic is a UserControl. I am trying to check for Title and set it in Attribute.

public partial class Topic: TopicBase
{
[Topic(Title = "My Topic")]
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
}
}

When I look for the Attribute I get null in TopicBase.cs

protected override void OnInit(EventArgs e)
    {
        var topicAttr = Attribute.GetCustomAttribute(this.GetType(), typeof(TopicAttribute)); //topicAttr is null here.
        if (topicAttr != null)
        {
            SetTopic(((TopicAttribute)topicAttr).Title);
        }
    }

Upvotes: 1

Views: 131

Answers (2)

Dmitry Bogomolov
Dmitry Bogomolov

Reputation: 426

As nvoigt said, you're trying to find the attributes of your class but you should use a MemberInfo of your method.

Something like that:

MethodInfo methodInfo = typeof(Topic).GetMethod("OnInit", BindingFlags.NonPublic | BindingFlags.Instance);
var attribute = methodInfo.GetCustomAttribute(typeof(TopicAttribute));

Upvotes: 2

nvoigt
nvoigt

Reputation: 77364

You are checking for the attribute on your type. Your attribute sits on the method. Either change your query or put the attribute on the type as expected by your query:

[Topic(Title = "My Topic")]
public partial class Topic : TopicBase
{
}

Upvotes: 2

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