public static IEnumerable <string> ToStrings(this IPortableDevicePropVariantCollection col)
{
uint count = 0;
col.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
yield return(PropVariant.FromValue(val));
}
}
public static IEnumerable <TEnum> ToEnum <TEnum>(this IPortableDevicePropVariantCollection col) where TEnum : struct // enum
{
uint count = 0;
col.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
yield return(GetEnumFromAttrGuid <TEnum>(PropVariant.FromValue(val)));
}
}
public static Guid[] ToGuid(this IPortableDevicePropVariantCollection col)
{
uint count = 0;
col.GetCount(ref count);
var result = new Guid[count];
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
result[i] = PropVariant.FromValue(val);
}
return(result);
}
public static TEnum[] ToArray <TEnum>(this IPortableDevicePropVariantCollection col) where TEnum : struct // enum
{
uint count = 0;
col.GetCount(ref count);
var result = new TEnum[count];
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
result[i] = GetEnumFromAttrGuid <TEnum>(PropVariant.FromValue(val));
}
return(result);
}
public IEnumerable <PropVariant> GetPropVariants(PropertyKey key)
{
object obj = null;
this.result.GetIUnknownValue(key, out obj);
var col = obj as IPortableDevicePropVariantCollection;
uint count = 0;
col.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
yield return(PropVariant.FromValue(val));
}
}
public PropVariant[] GetPropVariants(PropertyKey key)
{
if (!this.result.TryGetIUnknownValue(key, out object obj))
{
return(new PropVariant[0]);
}
var col = obj as IPortableDevicePropVariantCollection;
uint count = 0;
col.GetCount(ref count);
var result = new PropVariant[count];
for (uint i = 0; i < count; i++)
{
PROPVARIANT val = new PROPVARIANT();
col.GetAt(i, ref val);
result[i] = PropVariant.FromValue(val);
}
return(result);
}