This is my code of the Attribute Class that extends IMethodDecorator Interface
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Assembly | AttributeTargets.Module | AttributeTargets.Field)]
public class LogAttribute : Attribute, IMethodDecorator
{
ILogger log = Logger.Factory.GetLogger<Logger>();
String methodName;
public LogAttribute() {
}
public void Init(object instance, MethodBase method, object[] args)
{
methodName = method.Name;
}
public void OnEntry()
{
Console.WriteLine(methodName);
log.Debug(methodName);
}
public void OnExit()
{
Console.WriteLine("Exiting Method");
}
public void OnException(Exception exception)
{
Console.WriteLine("Exception was thrown");
}
}
I want to be able to use this as
[log("some logmessage")]
void method()
{
// some code
}
Any ideas ? I am using Method Decorator Fody package.
So I found a solution to my problem.
Basically I modified my class like -
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Assembly | AttributeTargets.Module | AttributeTargets.Field)]
public class LogAttribute : Attribute, IMethodDecorator
{
ILogger log = Logger.Factory.GetLogger<Logger>();
String methodName;
public String logMessage { get; set; }
private Lazy<IEnumerable<PropertyInfo>> _properties;
public MethodBase DecoratedMethod { get; private set; }
public LogAttribute() {
this._properties = new Lazy<IEnumerable<PropertyInfo>>(() =>
this.GetType()
.GetRuntimeProperties()
.Where(p => p.CanRead && p.CanWrite));
}
public void Init(object instance, MethodBase method, object[] args)
{
this.UpdateFromInstance(method);
methodName = method.Name;
}
public void OnEntry()
{
log.Debug("Inside" + methodName);
log.Debug(logMessage);
}
public void OnExit()
{
Console.WriteLine("Exiting Method");
}
public void OnException(Exception exception)
{
Console.WriteLine("Exception was thrown");
}
private void UpdateFromInstance(MethodBase method)
{
this.DecoratedMethod = method;
var declaredAttribute = method.GetCustomAttribute(this.GetType());
foreach (var property in this._properties.Value)
property.SetValue(this, property.GetValue(declaredAttribute));
}
}
Now I can use custom attribute like
[Log(logMessage = "This is Debug Message")]