I wrote a OnMethodBoundaryAspect attribute for Logging the methods exceptions.
I am in trouble with Complex method parameter.
The method signature is:
TestClass m_tf = new TestClass();
m_tf.DoWorkInternal(1, new Prova1() { ProvaP1=10, ProvaP2=11 });
I be able to trace the first parameter of type int, so i can get the parameter name and value.
But how can i get the values of the properties of the second parameters that is a complex object ?
Thanks in advance.
Giuseppe.
RESOLVED.
Found solution.
The aspect method is like this, and write the target method parameters in json format:
public override void OnException(MethodExecutionArgs args)
{
base.OnException(args);
Dictionary<string, object> m_args = new Dictionary<string, object>();
for (int i = 0; i < args.Arguments.Count(); i++)
{
string name = args.Method.GetParameters()[i].Name;
object obj = args.Arguments.GetArgument(i);
m_args.Add(name, obj);
}
var output = JsonConvert.SerializeObject(m_args);
:
:
}
While you can turn the parameter/argument array into a dictionary and JSON serialize it, another way would be just find it directly using the type.
Following code should do the trick for you.
public override void OnException(MethodExecutionArgs args)
{
Prova1 prova1 = null;
var parameters = args.Method.GetParameters();
var arguments = args.Arguments
for (int i = 0; i < arguments.Count(); i++)
{
var param = parameters[i];
var arg = arguments[i];
if (param.ParameterType == typeof(Prova1))
{
prova1 = arg;
}
}
var output = prova1;
// Do your magic
base.OnException(args);
}
Also, keep in mind of two things.
System.Linq functions should be able to clean out that function a lot.
You are looping through the argument list every time there is an exception. However, the indices of your parameters never change. Thus, you should be able to calculate the index of the complex method parameter once (either in CompileTimeInitialize() or RuntimeInitialize()) and re-use that index.
Related
I've been looking into this for a couple of hours but so far haven't gotten any luck.
Here's my C# code:
myClassInstance = new MyClass("MyParam", 1);
object[] args = new object[1] { myClassInstance };
MethodInfo methodInfo = GetType().GetMethod(myMethod, BindingFlags.NonPublic | BindingFlags.Instance);
string method = (string)methodInfo.Invoke(this, args);
I have MethodInfo and System.Reflection imported. The Unity error is this:
ArgumentException: Object of type 'SystemController' cannot be converted to type 'System.Object[]'
It doesn't point to a specific line in the code, but from what I can tell it seems to be an issue with converting the myClassInstance variable to an object, which doesn't make sense to me, as I believed everything in C# inherited from System.Object.
Here is MyClass:
public class MyClass
{
public string var1;
public int var2;
public MyClass(string param1, int param2)
{
var1 = param1;
var2 = param2;
}
}
Clearly, I'm not showing the entire class, but the only difference is that there are more variables and parameters to store. Those shouldn't change anything, so I won't bore you with them. It's just a class with a constructor, not inheriting from anything.
Any help I could get with this would be greatly appreciated. Let me know if you need more info.
The error here was me trying to pass the entire object[] array into my method as a parameter when I should have only passed the contents of the array. See here:
I was doing this:
void MyMethod(object[] args) {
MyClass instance = (MyClass)args[0];
...
}
But should've done this:
void MyMethod(MyClass myClassInstance) {
...
}
After reading some more documentation and reviewing the comments above I discovered that the .Invoke() method passes what's inside the args array instead of the entire array. At least, that's my current understanding, and it's what made my code work.
Thanks for the help.
I know this is a very fundamental question but answer to this will solve many of my doubts.
val new_parent = ParentDetails(intent.extras.getString("name"),
intent.extras.getString("email"),
intent.extras.getString("parent_relation"),
intent.extras.getString("locationdata"))
println(new_parent.tostring())
The code above doesn't print the various fields and their values present in the class.
The ParentDetails is a model I have created with some fields that are initialized. The ParentDetails model:
class ParentDetails {
var parent_id: Int = 0
var parent_name: String = ""
var parent_email: String = ""
var parent_relation: String = ""
var parent_location: String=""
constructor(parent_name: String, parent_email: String, parent_relation: String,parent_location:String) {
this.parent_name = parent_name
this.parent_email = parent_email
this.parent_relation = parent_relation
this.parent_location = parent_location
}
public fun getparentId(): Int {
return parent_id
}
fun ParentDetailsprintme() {
println(parent_name)
println(parent_email)
println(parent_relation)
println(parent_location)
}
}
In fact, it prints null and accessing individual fields, it prints empty string(the way it was initialized).
How do we explain this?
As I understand your problem is that calling println(new_parent.tostring()) does not print what you would like to print in function ParentDetailsprintme.
First of all, you have a typo, the correct call would be new_parent.toString().
Note that it could have been simplified as println(new_parent).
It does not print that you defined in the ParentDetailsprintme method, as the method is not called.
What println(new_parent.toString()) prints, is actually the hashcode of the object, as this is the default behaviour of every object.
To make it work call it like println(new_parent.ParentDetailsprintme()) or override the toString() method for example as:
override fun toString() = "$parent_name $parent_email $parent_relation $parent_location"
then the following
val new_parent = ParentDetails("myName", "myEmail", "myParent_relation", "myLocationdata")
println(new_parent)
should print
myName myEmail myParent_relation myLocationdata
Kotlin's println function simply calls System.out.println(message) under the hood which will call String.valueOf() (e.g. String.valueOf(Object object) for objects, which will call the toString() method of the passed object).
/** Prints the given message and newline to the standard output stream. */
#kotlin.internal.InlineOnly
public inline fun println(message: CharArray) {
System.out.println(message)
}
Update ("Using data class method also works"):
If you make the class to be a data class:
data class ParentDetails(
val parent_id: Int = 0,
val parent_name: String = "",
val parent_email: String = "",
val parent_relation: String = "",
val parent_location: String = ""
)
and then you execute
val new_parent = ParentDetails(0, "myName", "myEmail", "myParent_relation", "myLocationdata")
println(new_parent)
you will receive as result
ParentDetails(parent_id=0, parent_name=myName, parent_email=myEmail, parent_relation=myParent_relation, parent_location=myLocationdata)
This is because data classes override the toString() function:
The compiler automatically derives the following members from all
properties declared in the primary constructor:
equals()/hashCode() pair;
toString() of the form "User(name=John, age=42)";
Did you check that you receive valid data from your intent.extras?
Also I suggest you use data class for your models.
It will look something like this:
data class ParentDetails(
var parent_id: Int = 0,
var parent_name: String = "",
var parent_email: String = "",
var parent_relation: String = "",
var parent_location: String = ""
)
You will be able to use it like this :
val new_parent = ParentDetails(
parent_name = intent.extras.getString("name"),
parent_email = intent.extras.getString("email"),
parent_relation = intent.extras.getString("parent_relation"),
parent_location = intent.extras.getString("locationdata")
)
println(new_parent.tostring())
As already mentioned, you have a typo. toString returns the hashcode of an object unless it's overridden to return something else. Look up the original implementation for more details.
By overriding the toString method, you change what it returns, and through that, what is printed when you print(someClass). DVarga showed that in their answer.
Data classes auto-generate a toString method containing the content of the class. So creating a data class is a shortcut to getting output containing the data.
The reason the method you had didn't work is because you didn't call it. if you call it instead of toString, you would get the data printed.
Also, toString is explicitly called when you print a class. You don't need to call print(someInstance.toString()), print(someInstance) is enough.
And while I'm writing an answer, you don't need to use secondary constructors in Kotlin. Primary constructors would shorten your code significantly, whether it's a data class or not. Also, you should look into naming conventions.
I am trying to achieve attribute introduction like here but my attributes have property arguments like: [Foo(Bar = "Baz")]
How do I correctly pass the arguments? I'm not copying the attributes from something else, so I don't think I can use CustomAttributeData?
You can set properties of your custom attributes by using ObjectConstruction.NamedArguments dictionary.
For example:
public IEnumerable<AspectInstance> ProvideAspects(object targetElement)
{
Type targetType = (Type) targetElement;
var objectConstruction =
new ObjectConstruction(typeof (MyCustomAttribute).GetConstructor(Type.EmptyTypes));
objectConstruction.NamedArguments["Bar"] = "Baz";
var introduceAttributeAspect = new CustomAttributeIntroductionAspect(objectConstruction);
yield return new AspectInstance(targetType, introduceAttributeAspect);
}
Let's say I've a class myClass which has few properties, such as property1, property2, perperty3, etc. Now, I'd like to populate an array with each of those properties so that, I can access each of them through its index. Is there an automatic way of doing so?
Here's an example from SportsStore (Pro ASPN.NET MVC/Steve Sanderson/Apress) on how to gather all the active controllers in the the 'Assembly'.
var controllerTypes = from t in Assembly.GetExecutingAssembly().GetTypes()
where typeof(IController).IsAssignableFrom(t)
select t;
foreach(Type t in controllerTypes)
//Do something
I wonder if there is some thing like the one above I can use to collect (only) properties of a class and store them in a array, no matter each one's type value (int, string, or custom type)
I hope I was able to express myself clearly. Otherwise I can amend the text.
Thanks for helping.
You could use reflection:
var foo = new
{
Prop1 = "prop1",
Prop2 = 1,
Prop3 = DateTime.Now
};
var properties = TypeDescriptor.GetProperties(foo.GetType());
var list = new ArrayList();
foreach (PropertyDescriptor property in properties)
{
var value = property.GetValue(foo);
list.Add(value);
}
and LINQ version which looks better to the eye:
var list = TypeDescriptor
.GetProperties(foo.GetType())
.Cast<PropertyDescriptor>()
.Select(x => x.GetValue(foo))
.ToArray();
I got this from here:
foreach(Type t in controllerTypes)
{
foreach (MemberInfo mi in t.GetMembers() )
{
if (mi.MemberType==MemberTypes.Property)
{
// If the member is a property, display information about the property's accessor methods
foreach ( MethodInfo am in ((PropertyInfo) mi).GetAccessors() )
{
// do something with [am]
}
}
}
}
would the Type.GetProperties() method help you?
Is their a way in c# to instantiate a variable into a method call without using a switch statement.
It sounds like you want to take a string and use that string to call a method on an object, this can be done with reflection without the need for a switch statement.
string methodName = "ToString";
var method = typeof(TypeYourMethodExistsOn).GetMethod(methodName);
method.Invoke(objectInstance, null);
I'm not too clear, either. If you don't want to use reflection (heavy sometimes), for dynamically calling methods using a variable, you could use something like a collection containing delegates as values and call them.
I use an extremely like dictionary object to dynamically call a known method based on string inputs.
psuedo code:
delegate void Del(int i, double j);
class MathClass
{
static void Main()
{
MathClass m = new MathClass();
// Delegate instantiation using "MultiplyNumbers"
Del d = m.MultiplyNumbers;
Hashtable ht = new Hashtable();
ht.Add("mult", d);
// Invoke the delegate object.
System.Console.WriteLine("Invoking the delegate using 'MultiplyNumbers':");
for (int i = 1; i <= 5; i++)
{
((del) ht("mult"))(i, 2);
}
}
// Declare the associated method.
void MultiplyNumbers(int m, double n)
{
System.Console.Write(m * n + " ");
}
}