passiong unknown parameters at runtime

[kock]

Not sure exactly how to word this, but what's the best method of passing parameters to a function in C#, when you don't know the number or type of parameters at compile time? Is this possible? The type includes class instances as well as integers, characters, floats etc.

Thanks

[daat99]

Originally Posted by kock

Not sure exactly how to word this, but what's the best method of passing parameters to a function in C#, when you don't know the number or type of parameters at compile time? Is this possible? The type includes class instances as well as integers, characters, floats etc.

Thanks

You need to use reflections in order to achieve what you want.

[arul]

public void Something( params object[] args )
{
// do something with the args
}

then you can call the method like this

Something("hey", 1, new object(), "oh");

More about the 'params' keyword at MSDN: params (C#)

[kock]

Thank you arul but that wasn´t what i was trying to do .
What i was trying to do is to invoke methods wich you don´t know their signature, parameter types and number at runtime.
In depth, i was trying to instantiate several classes invoking their constructors when they haven´t a default constructor.I used the reflection classes as daat99 said to get the constructors, their number of parameters and their types.Then i made an instance for every parameter type, wich i think it´s an ugly way to do it.Is there other cleaner way to do it?.

ConstructorInfo ctrinfo = tipo.GetConstructors();
ParameterInfo[] parinfo = ctrinfo[0].GetParameters();

if (ctrinfo.Length > 1 && parinfo[0].ParameterType == typeof(Serial))
           parinfo = ctrinfo[1].GetParameters();

object[] parametros = new object[parinfo.Length];

for (int k = 0; k < parametros.Length; k++)
           parametros[k] = Activator.CreateInstance(parinfo[k].ParameterType);

if (ctrinfo.Length > 1 && parinfo[0].ParameterType == typeof(Serial))
           item = ctrinfo[1].Invoke(parametros);
else
            item = ctrinfo[0].Invoke(parametros);

[arul]

It isn't an ugly way, it's the only way. If the constructor needs certain parameters to be passed, it's so for a good reason.

Of course your code may fail on some types, but that is the price you pay for not taking care of them one by one.