I wrote this code. It's really ugly. I would like to refactor it. I MUST return a object[]. I was thinking maybe using a bool value to check if I have to move forward calling other methods and just having the final object[] creation.
private object[] TrasferisciSingoloFile(some parameters...)
{
Result result = new Result;
result = FTPRename(some parameters...);
if (result.error)
{
result.SetError("Some Problem 1");
object tip = new object[] { par as ThreadCounterManager, result };
return (object[])tip;
}
result = FTPDownloadAndCopy(some parameters...);
if (result.error)
{
result.SetError("Some Problem 2");
object tip = new object[] { par as ThreadCounterManager, result };
return (object[])tip;
}
result = FTPMove(some parameters...);
if (result.error)
{
result.SetError("Some Problem 3");
object tip = new object[] { par as ThreadCounterManager, result };
return (object[])tip;
}
result = FTPDelete(some parameters...);
if (result.error)
{
result.SetError("Some Problem 4");
object tip = new object[] { par as ThreadCounterManager, result };
return (object[])tip;
}
object tip1 = new object[] { par as ThreadCounterManager, result };
return (object[])tip1;
}
Let all the function of the suite FTPXXXX throw an exception when they found an error, so you can catch and return the error once in the catch(){} block. The "some problem xxxx message" can be decorated with a message you provide in raising the exception.
Assuming your FTP functions are somewhere else in code, consider having them throw exceptions, and use a try/catch clause in this function.
Result result = new Result();
try
{
result = FTPRename(some parameters...);
result = FTPDownloadAndCopy(some parameters...);
result = FTPMove(some parameters...);
result = FTPDelete(some parameters...);
}
catch (SomeException e)
{
return (object[])new object[] { par as ThreadCounterManager, result.SetError(e.Message) };
}
return return (object[])new object[] { par as ThreadCounterManager, result };
If you can modify the FTP methods, you could perhaps have them each assign the error message themselves, and make a helper method for creating the tip object. That way, you don't need to concern yourself with anything but checking to see if an error happened.
something like
private Object[] makeTip(arg1, arg2) {
return Object[] {arg1, arg2};
}
Result result = new Result;
result = FTPRename(some parameters...);
if(result.error)
return makeTip(par as ThreadCounterManager, result);
result = FTPDownloadAndCopy(some parameters...);
if(result.error)
return makeTip(par as ThreadCounterManager, result);
...
return makeTip(par as ThreadCounterManager, result);
Related
I am trying to invoke a method via reflection with parameters and I get:
object does not match target type
If I invoke a method without parameters, it works fine. Based on the following code if I call the method Test("TestNoParameters"), it works fine. However if I call Test("Run"), I get an exception. Is something wrong with my code?
My initial purpose was to pass an array of objects e.g. public void Run(object[] options) but this did not work and I tried something simpler e.g. string without success.
// Assembly1.dll
namespace TestAssembly
{
public class Main
{
public void Run(string parameters)
{
// Do something...
}
public void TestNoParameters()
{
// Do something...
}
}
}
// Executing Assembly.exe
public class TestReflection
{
public void Test(string methodName)
{
Assembly assembly = Assembly.LoadFile("...Assembly1.dll");
Type type = assembly.GetType("TestAssembly.Main");
if (type != null)
{
MethodInfo methodInfo = type.GetMethod(methodName);
if (methodInfo != null)
{
object result = null;
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
if (parameters.Length == 0)
{
// This works fine
result = methodInfo.Invoke(classInstance, null);
}
else
{
object[] parametersArray = new object[] { "Hello" };
// The invoke does NOT work;
// it throws "Object does not match target type"
result = methodInfo.Invoke(methodInfo, parametersArray);
}
}
}
}
}
Change "methodInfo" to "classInstance", just like in the call with the null parameter array.
result = methodInfo.Invoke(classInstance, parametersArray);
You have a bug right there
result = methodInfo.Invoke(methodInfo, parametersArray);
it should be
result = methodInfo.Invoke(classInstance, parametersArray);
A fundamental mistake is here:
result = methodInfo.Invoke(methodInfo, parametersArray);
You are invoking the method on an instance of MethodInfo. You need to pass in an instance of the type of object that you want to invoke on.
result = methodInfo.Invoke(classInstance, parametersArray);
The provided solution does not work for instances of types loaded from a remote assembly. To do that, here is a solution that works in all situations, which involves an explicit type re-mapping of the type returned through the CreateInstance call.
This is how I need to create my classInstance, as it was located in a remote assembly.
// sample of my CreateInstance call with an explicit assembly reference
object classInstance = Activator.CreateInstance(assemblyName, type.FullName);
However, even with the answer provided above, you'd still get the same error. Here is how to go about:
// first, create a handle instead of the actual object
ObjectHandle classInstanceHandle = Activator.CreateInstance(assemblyName, type.FullName);
// unwrap the real slim-shady
object classInstance = classInstanceHandle.Unwrap();
// re-map the type to that of the object we retrieved
type = classInstace.GetType();
Then do as the other users mentioned here.
I tried to work with all the suggested answers above but nothing seems to work for me. So i am trying to explain what worked for me here.
I believe if you are calling some method like the Main below or even with a single parameter as in your question, you just have to change the type of parameter from string to object for this to work. I have a class like below
//Assembly.dll
namespace TestAssembly{
public class Main{
public void Hello()
{
var name = Console.ReadLine();
Console.WriteLine("Hello() called");
Console.WriteLine("Hello" + name + " at " + DateTime.Now);
}
public void Run(string parameters)
{
Console.WriteLine("Run() called");
Console.Write("You typed:" + parameters);
}
public static string StaticString()
{
return "static string example";
}
public string TestNoParameters()
{
Console.WriteLine("TestNoParameters() called");
return ("TestNoParameters() called");
}
public void Execute(object[] parameters)
{
Console.WriteLine("Execute() called");
Console.WriteLine("Number of parameters received: " + parameters.Length);
for(int i=0;i<parameters.Length;i++){
Console.WriteLine(parameters[i]);
}
}
}
}
Then you have to pass the parameterArray inside an object array like below while invoking it. The following method is what you need to work
private object ExecuteWithReflection(string methodName,object parameterObject = null)
{
Assembly assembly = Assembly.LoadFile("Assembly.dll");
Type typeInstance = assembly.GetType("TestAssembly.Main");
MethodInfo methodInfo = typeInstance.GetMethod(methodName);
ParameterInfo[] parameterInfo = methodInfo.GetParameters();
object result = null;
if (typeInstance != null) //non static
{
if(methodInfo.IsStatic == false)
{
//instance is needed to invoke the method
object classInstance = Activator.CreateInstance(typeInstance, null);
if (parameterInfo.Length == 0)
{
// there is no parameter we can call with 'null'
result = methodInfo.Invoke(classInstance, null);
}
else
{
result = methodInfo.Invoke(classInstance,new object[] { parameterObject } );
}
}
else //handle static
{
if (parameterInfo.Length == 0)
{
// there is no parameter we can call with 'null'
result = methodInfo.Invoke(null, null);
}
else
{
result = methodInfo.Invoke(null,new object[] { parameterObject } );
}
}
}
return result;
}
This method makes it easy to invoke the method, it can be called as following
ExecuteWithReflection("Hello");
ExecuteWithReflection("Run","Vinod");
ExecuteWithReflection("TestNoParameters");
ExecuteWithReflection("Execute",new object[]{"Vinod","Srivastav"});
ExecuteWithReflection("StaticString");
I'am posting this answer because many visitors enter here from google for this problem.
string result = this.GetType().GetMethod("Print").Invoke(this, new object[]{"firstParam", 157, "third_Parammmm" } );
when external .dll -instead of this.GetType(), you might use typeof(YourClass).
I would use it like this, its way shorter and it won't give any problems
dynamic result = null;
if (methodInfo != null)
{
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
result = methodInfo.Invoke(classInstance, parameters.Length == 0 ? null : parametersArray);
}
Assembly assembly = Assembly.LoadFile(#"....bin\Debug\TestCases.dll");
//get all types
var testTypes = from t in assembly.GetTypes()
let attributes = t.GetCustomAttributes(typeof(NUnit.Framework.TestFixtureAttribute), true)
where attributes != null && attributes.Length > 0
orderby t.Name
select t;
foreach (var type in testTypes)
{
//get test method in types.
var testMethods = from m in type.GetMethods()
let attributes = m.GetCustomAttributes(typeof(NUnit.Framework.TestAttribute), true)
where attributes != null && attributes.Length > 0
orderby m.Name
select m;
foreach (var method in testMethods)
{
MethodInfo methodInfo = type.GetMethod(method.Name);
if (methodInfo != null)
{
object result = null;
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
if (parameters.Length == 0)
{
// This works fine
result = methodInfo.Invoke(classInstance, null);
}
else
{
object[] parametersArray = new object[] { "Hello" };
// The invoke does NOT work;
// it throws "Object does not match target type"
result = methodInfo.Invoke(classInstance, parametersArray);
}
}
}
}
I m invoking the weighted average through reflection. And had used method with more than one parameter.
Class cls = Class.forName(propFile.getProperty(formulaTyp));// reading class name from file
Object weightedobj = cls.newInstance(); // invoke empty constructor
Class<?>[] paramTypes = { String.class, BigDecimal[].class, BigDecimal[].class }; // 3 parameter having first is method name and other two are values and their weight
Method printDogMethod = weightedobj.getClass().getMethod("applyFormula", paramTypes); // created the object
return BigDecimal.valueOf((Double) printDogMethod.invoke(weightedobj, formulaTyp, decimalnumber, weight)); calling the method
On .Net 4.7.2 to invoke a method inside a class loaded from an external assembly you can use the following code in VB.net
Dim assembly As Reflection.Assembly = Nothing
Try
assembly = Reflection.Assembly.LoadFile(basePath & AssemblyFileName)
Dim typeIni = assembly.[GetType](AssemblyNameSpace & "." & "nameOfClass")
Dim iniClass = Activator.CreateInstance(typeIni, True)
Dim methodInfo = typeIni.GetMethod("nameOfMethod")
'replace nothing by a parameter array if you need to pass var. paramenters
Dim parametersArray As Object() = New Object() {...}
'without parameters is like this
Dim result = methodInfo.Invoke(iniClass, Nothing)
Catch ex As Exception
MsgBox("Error initializing main layout:" & ex.Message)
Application.Exit()
Exit Sub
End Try
I have three different databases that I need to check that I am connected to. This is what I originally have, which works perfectly fine.
public async Task<ServiceAvailabilityDTO> ServiceAvailabilityStatus()
{
return new ServiceAvailabilityDTO
{
IsDb1Online = await IsDb1Available(),
IsDb2Online = IsDb2Available(),
IsDb3Online = await IsDb3Available()
};
}
private async Task<bool> IsDb1Available()
{
var count = await _db1Service.GetDbCount();
if (count > 0)
return true;
return false;
}
private bool IsDb2Available()
{
if (_db2Service.GetDbCount() > 0)
return true;
return false;
}
private async Task<bool> IsDb3Available()
{
var pong = await _db3Provider.PingDb();
if(pong.Success == true && pong.Version != null)
return true;
return false;
}
Now however, I need to log exception messages in my DTO for each DB check.
public async Task<ServiceAvailabilityDTO> ServiceAvailabilityStatus()
{
return new ServiceAvailabilityDTO
{
IsDb1Online = await IsDb1Available(),
IsDb2Online = IsDb2Available(),
IsDb3Online = await IsDb3Available(this) // This is an example. I want to pass the reference of **ServiceAvailabilityDTO** to **IsDb3Available**
};
}
private async Task<bool> IsDb3Available(ServiceAvailabilityDTO availability)
{
try
{
var pong = await _db3Provider.PingDb();
if(pong.Success == true && pong.Version != null)
return true;
return false;
}
catch (Exception e)
{
var exceptionMessage = e.Message;
if (e.InnerException != null)
{
// This is what I hope to put into the object reference
exceptionMessage = String.Join("\n", exceptionMessage, e.InnerException.Message);
availability.db3Exception = exceptionMessage ;
}
return false;
}
}
My question is;
Can I keep my return method the same as in the first example, and pass the object reference to each method to store the exception and still return my bool value.
Or does the object not get created until all of the method calls have happened, and then create the object with the returned values?
I know I could just create the object normally and pass it in each
method call, but it is specifically this way of doing it that has
inspired me to ask this question, purely to be informed and learn
from.
Thanks.
No, you cannot do it like this because in the context of what you're doing this does not refer to the object you're populating, it refers to the object containing the method you're calling.
public async Task<ServiceAvailabilityDTO> ServiceAvailabilityStatus()
{
return new ServiceAvailabilityDTO
{
IsDb1Online = await IsDb1Available(),
IsDb2Online = IsDb2Available(),
IsDb3Online = await IsDb3Available(this) // here 'this' does NOT ref to ServiceAvailabilityDTO
};
}
There is no keyword which does refer to ServiceAvailabilityDTO either, so you're left with creating the object, and passing it to each method. At this point, I dont think there is much point you returning the boolean either - you may as well set the boolean property in line
public async Task<ServiceAvailabilityDTO> ServiceAvailabilityStatus()
{
var sa = new ServiceAvailabilityDTO();
await CheckDb1Available(sa);
CheckDb2Available(sa);
await CheckDb3Available(sa);
return sa;
}
(Note I've renamed the methods from Is* to Check* as the former implies a return boolean, the latter implies something going on inline.)
I have some code that looks like this:
public Tuple<bool, SomeObjectModel> CheckIfJsonIsValid(string IncomingJson)
{
SomeObjectModel TheObjectModel = new SomeObjectModel();
JavascriptSerializer TheSerializer = new JavascriptSerializer();
.....
try
{
TheObjectModel = TheSerializer.Deserialize<SomeObjectModel>(IncomingJson);
}
catch
{
return new Tuple<bool, SomeObjectModel>(false, null); //question here
}
.....
return new Tuple<bool, SomeObjectModel>(true, TheObjectModel);
}
The calling method first check the returning tuple's Item1, and if it's false, ends its process.
Is it better practice a) to return a null value in the Tuple or b) to return a new and fresh instance of SomeObjectModel? Are there any performance implications?
Thanks for your suggestions.
Let me suggest three alternative solutions:
ParseJsonIfValid: If deserializing works, TheObjectModel is always non-null. Thus, there is no need for the boolean:
public SomeObjectModel ParseJsonIfValid(string IncomingJson)
{
JavascriptSerializer TheSerializer = new JavascriptSerializer();
.....
try
{
return TheSerializer.Deserialize<SomeObjectModel>(IncomingJson);
}
catch
{
return null;
}
}
In the calling function simply check whether the return value is null or not.
ParseJson: If the JSON is usually valid, and invalid JSON is a sign of something gone terribly wrong, just throw an exception:
public SomeObjectModel ParseJson(string IncomingJson)
{
JavascriptSerializer TheSerializer = new JavascriptSerializer();
.....
try
{
return TheSerializer.Deserialize<SomeObjectModel>(IncomingJson);
}
catch (Exception e)
{
throw new TheServerSentRubbishException(e);
}
}
Be sure to include the inner ("real") exception, so that the calling function can log the real cause of the error for debugging purposes.
TryParseJson: If null can be a valid deserialization, you can use the following pattern, which has the advantage of being consistent with the TryParse methods of the .NET framework:
public bool TryParseJson(string IncomingJson, out SomeObjectModel theObjectModel)
{
JavascriptSerializer TheSerializer = new JavascriptSerializer();
.....
try
{
theObjectModel = TheSerializer.Deserialize<SomeObjectModel>(IncomingJson);
return true;
}
catch (Exception e)
{
return false;
}
}
I am using a Converter to convert a List<string> into a List<UInt32>
It does well, but when one of the array elements is not convertable, ToUint32 throw FormatException.
I would like to inform the user about the failed element.
try
{
List<UInt32> MyList = SomeStringList.ConvertAll(new Converter<string, UInt32>(element => Convert.ToUInt32(element)));
}
catch (FormatException ex)
{
//Want to display some message here regarding element.
}
I am catching the FormatException but can't find if it contains the string name.
You can catch exception inside the lambda:
List<UInt32> MyList = SomeStringList.ConvertAll(new Converter<string, UInt32>(element =>
{
try
{
return Convert.ToUInt32(element);
}
catch (FormatException ex)
{
// here you have access to element
return default(uint);
}
}));
You could use the TryParse method:
var myList = someStringList.ConvertAll(element =>
{
uint result;
if (!uint.TryParse(element, out result))
{
throw new FormatException(string.Format("Unable to parse the value {0} to an UInt32", element));
}
return result;
});
Here is what I would use in this contest:
List<String> input = new List<String> { "1", "2", "three", "4", "-2" };
List<UInt32?> converted = input.ConvertAll(s =>
{
UInt32? result;
try
{
result = UInt32.Parse(s);
}
catch
{
result = null;
Console.WriteLine("Attempted conversion of '{0}' failed.", s);
}
return result;
});
You could always use the Where() method to filter the null values later:
Where(u => u != null)
I am trying to invoke a method via reflection with parameters and I get:
object does not match target type
If I invoke a method without parameters, it works fine. Based on the following code if I call the method Test("TestNoParameters"), it works fine. However if I call Test("Run"), I get an exception. Is something wrong with my code?
My initial purpose was to pass an array of objects e.g. public void Run(object[] options) but this did not work and I tried something simpler e.g. string without success.
// Assembly1.dll
namespace TestAssembly
{
public class Main
{
public void Run(string parameters)
{
// Do something...
}
public void TestNoParameters()
{
// Do something...
}
}
}
// Executing Assembly.exe
public class TestReflection
{
public void Test(string methodName)
{
Assembly assembly = Assembly.LoadFile("...Assembly1.dll");
Type type = assembly.GetType("TestAssembly.Main");
if (type != null)
{
MethodInfo methodInfo = type.GetMethod(methodName);
if (methodInfo != null)
{
object result = null;
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
if (parameters.Length == 0)
{
// This works fine
result = methodInfo.Invoke(classInstance, null);
}
else
{
object[] parametersArray = new object[] { "Hello" };
// The invoke does NOT work;
// it throws "Object does not match target type"
result = methodInfo.Invoke(methodInfo, parametersArray);
}
}
}
}
}
Change "methodInfo" to "classInstance", just like in the call with the null parameter array.
result = methodInfo.Invoke(classInstance, parametersArray);
You have a bug right there
result = methodInfo.Invoke(methodInfo, parametersArray);
it should be
result = methodInfo.Invoke(classInstance, parametersArray);
A fundamental mistake is here:
result = methodInfo.Invoke(methodInfo, parametersArray);
You are invoking the method on an instance of MethodInfo. You need to pass in an instance of the type of object that you want to invoke on.
result = methodInfo.Invoke(classInstance, parametersArray);
The provided solution does not work for instances of types loaded from a remote assembly. To do that, here is a solution that works in all situations, which involves an explicit type re-mapping of the type returned through the CreateInstance call.
This is how I need to create my classInstance, as it was located in a remote assembly.
// sample of my CreateInstance call with an explicit assembly reference
object classInstance = Activator.CreateInstance(assemblyName, type.FullName);
However, even with the answer provided above, you'd still get the same error. Here is how to go about:
// first, create a handle instead of the actual object
ObjectHandle classInstanceHandle = Activator.CreateInstance(assemblyName, type.FullName);
// unwrap the real slim-shady
object classInstance = classInstanceHandle.Unwrap();
// re-map the type to that of the object we retrieved
type = classInstace.GetType();
Then do as the other users mentioned here.
I tried to work with all the suggested answers above but nothing seems to work for me. So i am trying to explain what worked for me here.
I believe if you are calling some method like the Main below or even with a single parameter as in your question, you just have to change the type of parameter from string to object for this to work. I have a class like below
//Assembly.dll
namespace TestAssembly{
public class Main{
public void Hello()
{
var name = Console.ReadLine();
Console.WriteLine("Hello() called");
Console.WriteLine("Hello" + name + " at " + DateTime.Now);
}
public void Run(string parameters)
{
Console.WriteLine("Run() called");
Console.Write("You typed:" + parameters);
}
public static string StaticString()
{
return "static string example";
}
public string TestNoParameters()
{
Console.WriteLine("TestNoParameters() called");
return ("TestNoParameters() called");
}
public void Execute(object[] parameters)
{
Console.WriteLine("Execute() called");
Console.WriteLine("Number of parameters received: " + parameters.Length);
for(int i=0;i<parameters.Length;i++){
Console.WriteLine(parameters[i]);
}
}
}
}
Then you have to pass the parameterArray inside an object array like below while invoking it. The following method is what you need to work
private object ExecuteWithReflection(string methodName,object parameterObject = null)
{
Assembly assembly = Assembly.LoadFile("Assembly.dll");
Type typeInstance = assembly.GetType("TestAssembly.Main");
MethodInfo methodInfo = typeInstance.GetMethod(methodName);
ParameterInfo[] parameterInfo = methodInfo.GetParameters();
object result = null;
if (typeInstance != null) //non static
{
if(methodInfo.IsStatic == false)
{
//instance is needed to invoke the method
object classInstance = Activator.CreateInstance(typeInstance, null);
if (parameterInfo.Length == 0)
{
// there is no parameter we can call with 'null'
result = methodInfo.Invoke(classInstance, null);
}
else
{
result = methodInfo.Invoke(classInstance,new object[] { parameterObject } );
}
}
else //handle static
{
if (parameterInfo.Length == 0)
{
// there is no parameter we can call with 'null'
result = methodInfo.Invoke(null, null);
}
else
{
result = methodInfo.Invoke(null,new object[] { parameterObject } );
}
}
}
return result;
}
This method makes it easy to invoke the method, it can be called as following
ExecuteWithReflection("Hello");
ExecuteWithReflection("Run","Vinod");
ExecuteWithReflection("TestNoParameters");
ExecuteWithReflection("Execute",new object[]{"Vinod","Srivastav"});
ExecuteWithReflection("StaticString");
I'am posting this answer because many visitors enter here from google for this problem.
string result = this.GetType().GetMethod("Print").Invoke(this, new object[]{"firstParam", 157, "third_Parammmm" } );
when external .dll -instead of this.GetType(), you might use typeof(YourClass).
I would use it like this, its way shorter and it won't give any problems
dynamic result = null;
if (methodInfo != null)
{
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
result = methodInfo.Invoke(classInstance, parameters.Length == 0 ? null : parametersArray);
}
Assembly assembly = Assembly.LoadFile(#"....bin\Debug\TestCases.dll");
//get all types
var testTypes = from t in assembly.GetTypes()
let attributes = t.GetCustomAttributes(typeof(NUnit.Framework.TestFixtureAttribute), true)
where attributes != null && attributes.Length > 0
orderby t.Name
select t;
foreach (var type in testTypes)
{
//get test method in types.
var testMethods = from m in type.GetMethods()
let attributes = m.GetCustomAttributes(typeof(NUnit.Framework.TestAttribute), true)
where attributes != null && attributes.Length > 0
orderby m.Name
select m;
foreach (var method in testMethods)
{
MethodInfo methodInfo = type.GetMethod(method.Name);
if (methodInfo != null)
{
object result = null;
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
if (parameters.Length == 0)
{
// This works fine
result = methodInfo.Invoke(classInstance, null);
}
else
{
object[] parametersArray = new object[] { "Hello" };
// The invoke does NOT work;
// it throws "Object does not match target type"
result = methodInfo.Invoke(classInstance, parametersArray);
}
}
}
}
I m invoking the weighted average through reflection. And had used method with more than one parameter.
Class cls = Class.forName(propFile.getProperty(formulaTyp));// reading class name from file
Object weightedobj = cls.newInstance(); // invoke empty constructor
Class<?>[] paramTypes = { String.class, BigDecimal[].class, BigDecimal[].class }; // 3 parameter having first is method name and other two are values and their weight
Method printDogMethod = weightedobj.getClass().getMethod("applyFormula", paramTypes); // created the object
return BigDecimal.valueOf((Double) printDogMethod.invoke(weightedobj, formulaTyp, decimalnumber, weight)); calling the method
On .Net 4.7.2 to invoke a method inside a class loaded from an external assembly you can use the following code in VB.net
Dim assembly As Reflection.Assembly = Nothing
Try
assembly = Reflection.Assembly.LoadFile(basePath & AssemblyFileName)
Dim typeIni = assembly.[GetType](AssemblyNameSpace & "." & "nameOfClass")
Dim iniClass = Activator.CreateInstance(typeIni, True)
Dim methodInfo = typeIni.GetMethod("nameOfMethod")
'replace nothing by a parameter array if you need to pass var. paramenters
Dim parametersArray As Object() = New Object() {...}
'without parameters is like this
Dim result = methodInfo.Invoke(iniClass, Nothing)
Catch ex As Exception
MsgBox("Error initializing main layout:" & ex.Message)
Application.Exit()
Exit Sub
End Try