public override bool GenerateDynamicParameters()
{
var thisIsFirstObject = false;
try {
if (!IsReentrantLocked)
{
// we're not locked at this point. Let's turn on the lock.
IsReentrantLocked = true;
thisIsFirstObject = true;
try {
// do all the work that we need to during the lock
// this includes:
// one-time-per-call work
// any access to MyInvocation.MyCommand.*
// modifying parameter validation sets
//
if (MyInvocation != null && MyInvocation.MyCommand != null && MyInvocation.MyCommand.Parameters != null)
{
GetType().AddOrSet(MyInvocation.MyCommand.Parameters, "MyInvocation.MyCommand.Parameters");
}
#if DEEP_DEBUG
else
{
if (MyInvocation == null)
{
Console.WriteLine("»»» Attempt to get parameters MyInvocation == NULL");
}
else
{
if (MyInvocation.MyCommand == null)
{
Console.WriteLine("»»» Attempt to get parameters MyCommand == NULL");
}
else
{
Console.WriteLine("»»» Attempt to get parameters Parameters == NULL");
}
}
}
#endif
// the second time, it will generate all the parameters, including the dynamic ones.
// (not that we currently need it, but if you do, you gotta do it here!)
// var all_parameters = MyInvocation.MyCommand.Parameters;
// ask for the unbound arguments.
var unbound = UnboundArguments;
if (unbound.ContainsKey("ProviderName") || unbound.ContainsKey("Provider"))
{
var pName = unbound.ContainsKey("ProviderName")?unbound["ProviderName"]:unbound["Provider"];
if (pName != null)
{
if (pName.GetType().IsArray)
{
ProviderName = pName as string[] ?? (((object[])pName).Select(p => p.ToString()).ToArray());
}
else
{
ProviderName = new[] { pName.ToString() };
}
// a user specifies -providerName
_isUserSpecifyOneProviderName = (ProviderName.Count() == 1);
}
}
// we've now got a copy of the arguments that aren't bound
// and we can potentially narrow the provider selection based
// on arguments the user specified.
if (null == CachedSelectedProviders || IsFailingEarly || IsCanceled)
{
#if DEEP_DEBUG
Console.WriteLine("»»» Cancelled before we got finished doing dynamic parameters");
#endif
// this happens if there is a serious failure early in the cmdlet
// i.e. - if the SelectedProviders comes back empty (due to agressive filtering)
// in this case, we just want to provide a catch-all for remaining arguments so that we can make
// output the error that we really want to (that the user specified conditions that filtered them all out)
DynamicParameterDictionary.Add("RemainingArguments", new RuntimeDefinedParameter("RemainingArguments", typeof(object), new Collection <Attribute> {
new ParameterAttribute()
{
ValueFromRemainingArguments = true
},
}));
}
// at this point, we're actually calling to have the dynamic parameters generated
// that are expected to be used.
return(ActualGenerateDynamicParameters(unbound));
} finally {
IsReentrantLocked = false;
}
}
// otherwise just call the AGDP because we're in a reentrant call.
// and this might be needed if the original call had some strange need
// to know what the parameters that it's about to generate would be.
// Yeah, you heard me.
return(ActualGenerateDynamicParameters(null));
} finally
{
if (thisIsFirstObject)
{
// clean up our once-per-call data.
GetType().Remove <PackageProvider[]>("CachedSelectedProviders");
GetType().Remove <Dictionary <string, ParameterMetadata> >("MyInvocation.MyCommand.Parameters");
GetType().Remove <DynamicOption[]>("CachedDynamicOptions");
}
}
// return true;
}