Dynamic invoke of a method using named parameters

Question

We\'re currently using .NET 3.5 and part of our application uses dynamic invocation (using MethodBase.Invoke)

I am wondering if it is possible to mix in Named Parame

Answer 1

You can use code like this:

public static class ReflectionExtensions {

    public static object InvokeWithNamedParameters(this MethodBase self, object obj, IDictionary namedParameters) { 
        return self.Invoke(obj, MapParameters(self, namedParameters));
    }

    public static object[] MapParameters(MethodBase method, IDictionary namedParameters)
    {
        string[] paramNames = method.GetParameters().Select(p => p.Name).ToArray();
        object[] parameters = new object[paramNames.Length];
        for (int i = 0; i < parameters.Length; ++i) 
        {
            parameters[i] = Type.Missing;
        }
        foreach (var item in namedParameters)
        {
            var paramName = item.Key;
            var paramIndex = Array.IndexOf(paramNames, paramName);
            if (paramIndex >= 0)
            {
                parameters[paramIndex] = item.Value;
            }
        }
        return parameters;
    }
}

And then call it like this:

var parameters = new Dictionary();
// Add parameters ...
methodInfo.InvokeWithNamedParameters(obj, parameters);