WMI question

[David Shen]

Hi,

Here are sections of my codes:

private void test()
{
ObjectQuery objectQuery = new ObjectQuery("se lect * from
Win32_NetworkAd apterConfigurat ion");
ManagementObjec tSearcher searcher = new
ManagementObjec tSearcher(objec tQuery);
foreach (ManagementObje ct share in searcher.Get())
{
AppendObject(sh are);
}

}

private void AppendObject(Ma nagementObject obj)
{
PropertyDataCol lection dataCollection = obj.Properties;
foreach (PropertyData data in dataCollection)
{
if (data.IsArray)
{
object[] tempArray = (object[])(obj[data.Name]);
if (tempArray != null)
{
AppendString(te xtBox1, data.Name);
foreach (object temp in tempArray)
{
if (temp != null)
Debug.WriteLine (temp.ToString( ));
}
}
}
else
{
object temp = obj[data.Name];
if (temp != null)
{
AppendString(te xtBox1, data.Name + " = " + temp.ToString() );
}
else
AppendString(te xtBox1, data.Name);
}
}
AppendString(te xtBox1, "");
}


My question is why do I got an "System.Invalid CastException" when the code
reaches the line:
object[] tempArray = (object[])(obj[data.Name]);
when data.Name is GatewayCostMetr ic.

According to platform SDK, GatewayCostMetr ic is an array of uint16 and the
in fact the Type property for the data.Type is CimType.UInt16.

I have trace through and be able to cast array of strings to array of
objects. Why is this cast invalid?

Any one can help me on this? Thanks.

[Imran Koradia]

Re: WMI question

> My question is why do I got an "System.Invalid CastException" when the code[color=blue]
> reaches the line:
> object[] tempArray = (object[])(obj[data.Name]);
> when data.Name is GatewayCostMetr ic.
>
> According to platform SDK, GatewayCostMetr ic is an array of uint16 and the
> in fact the Type property for the data.Type is CimType.UInt16.[/color]

True - its a uint16 array. But its the 'Value' thats an array - not the
name. The 'Name' is a String property and is simply 'GatewayCostMet ric' in
this case - just one value not an array which is why you get an
InvalidCastExce ption.


Imran.