CODEWITHSUNDEEP
c#datetimewmi
Mark Harwood
Mark Harwood

Reputation: 2415

Weird String returned from LastBootUpTime

I'm returning a value from Win32_OperatingSystem using System.Management (I know about Microsoft.Management.Infrastructure but I'm just doing some testing).

This is what I run:

string bootTime = "";
//Creating a management searcher object
ManagementObjectSearcher mgmtObjSearcher = new ManagementObjectSearcher("SELECT LastBootUpTime FROM Win32_OperatingSystem");
//Collection to hold "results"
ManagementObjectCollection objCollection = mgmtObjSearcher.Get();
foreach (ManagementObject mgmtObject in objCollection)
{
    bootTime = mgmtObject["LastBootUpTime"].ToString();
}

But when trying to run Convert.ToDateTime(bootTime).ToString("dd/MM/yyyy hh:mm:ss"); I get the following error:

System.FormatException: 'String was not recognized as a valid DateTime.'

It looks like the LastBootUpTime value is being returned as 20190703085750.500000+060 which I can't seem to convert using Convert.ToDateTime and can't work with using DateTime.Parse

Can someone lend a helping hand and let me know where I'm going wrong? I just want to return the LastBootUpTime and convert a specific string format ("dd/MM/yyyy hh:mm:ss"). Any help is very much appreciated :)

Upvotes: 1

Views: 695

Answers (1)

Mark Harwood
Mark Harwood

Reputation: 2415

Following from Ňɏssa Pøngjǣrdenlarp's and Soner Gönül's comments, this is what I ended up with:

string bootTime = "";
//Creating a management searcher object
ManagementObjectSearcher mgmtObjSearcher = new ManagementObjectSearcher("SELECT LastBootUpTime FROM Win32_OperatingSystem");
//Collection to hold "results"
ManagementObjectCollection objCollection = mgmtObjSearcher.Get();
foreach (ManagementObject mgmtObject in objCollection)
{
    bootTime = ManagementDateTimeConverter.ToDateTime(mgmtObject["LastBootUpTime"].ToString()).ToString("dd/MM/yyyy HH:mm:ss");
}

UPDATE Following infinit_e comment, this is how I would get the value without using a foreach loop:

string bootTime = new ManagementObjectSearcher("SELECT LastBootUpTime FROM Win32_OperatingSystem").Get()
    .OfType<ManagementObject>()
    .First()
    .Properties["LastBootUpTime"].Value.ToString();

Upvotes: 1

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