✅ Using Activator.CreateInstance() when the constructor has arguments - not finding constructor

I'm trying to create a class instance dynamically using

Activator.CreateInstance()

Activator.CreateInstance()

, and it's crashing and not finding the constructor.

My object looks like this:

public class MyClass : MyBaseClass
{
    MyClass(ILogger logger) : base(logger)
    {}
}

public class MyClass : MyBaseClass
{
    MyClass(ILogger logger) : base(logger)
    {}
}

And I'm creating it like this:

Type myClassType = typeof(MyClass);
LoggerFactory loggerFactory = new();
ILogger logger = loggerFactory.CreateLogger(myClassType);
MyBaseClass? myInstance = (MyBaseClass?)Activator.CreateInstance(myClassType, logger);

Type myClassType = typeof(MyClass);
LoggerFactory loggerFactory = new();
ILogger logger = loggerFactory.CreateLogger(myClassType);
MyBaseClass? myInstance = (MyBaseClass?)Activator.CreateInstance(myClassType, logger);

However, when it hits the

CreateInstance()

CreateInstance()

line, an exception occurs:

An exception of type 'System.MissingMethodException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'Constructor on type 'MyClass' not found.'

An exception of type 'System.MissingMethodException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'Constructor on type 'MyClass' not found.'

Any idea what I'm doing wrong here?

C#•4y ago•

11 replies

Hugh

✅ Using Activator.CreateInstance() when the constructor has arguments - not finding constructor

I'm trying to create a class instance dynamically using

Activator.CreateInstance()

Activator.CreateInstance()

, and it's crashing and not finding the constructor.

My object looks like this:

public class MyClass : MyBaseClass
{
    MyClass(ILogger logger) : base(logger)
    {}
}

public class MyClass : MyBaseClass
{
    MyClass(ILogger logger) : base(logger)
    {}
}

And I'm creating it like this:

Type myClassType = typeof(MyClass);
LoggerFactory loggerFactory = new();
ILogger logger = loggerFactory.CreateLogger(myClassType);
MyBaseClass? myInstance = (MyBaseClass?)Activator.CreateInstance(myClassType, logger);

Type myClassType = typeof(MyClass);
LoggerFactory loggerFactory = new();
ILogger logger = loggerFactory.CreateLogger(myClassType);
MyBaseClass? myInstance = (MyBaseClass?)Activator.CreateInstance(myClassType, logger);

However, when it hits the

CreateInstance()

CreateInstance()

line, an exception occurs:

An exception of type 'System.MissingMethodException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'Constructor on type 'MyClass' not found.'

An exception of type 'System.MissingMethodException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'Constructor on type 'MyClass' not found.'

Any idea what I'm doing wrong here?

✅ Using Activator.CreateInstance() when the constructor has arguments - not finding constructor

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