CODEWITHSUNDEEP
c#wmi
Dayan
Dayan

Reputation: 8031

C# NullReferenceException on Win32_PhysicalMemory

I have the following struct;

static Memory memory;

  public struct Memory
  {
      public string Name;
      public string Manufacturer;
      public string MemoryType ;
      public string Speed;
      public string DeviceLocator;
      public string Capacity;
      public string OtherInfo;
  };

I can obtain everything but the following:

    ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMemory");
         ManagementObjectCollection myobject = searcher.Get();
             foreach (ManagementObject item in myobject)
             {
                memory.OtherInfo = item["OtherIdentifyingInfo"].ToString();
             }

When i try to do the above, i get:

Object reference not set to an instance of an object.

Do i have to somehow create an instance of item["OtherIdentifyingInfo"]?

Upvotes: 1

Views: 1582

Answers (2)

sa_ddam213
sa_ddam213

Reputation: 43616

A simple null check will fix the error, but it looks like Win32_PhysicalMemory does not use OtherIdentifyingInfo

memory = new Memory();
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMemory");
ManagementObjectCollection myobject = searcher.Get();
foreach (ManagementObject item in myobject)
{
    if (item["OtherIdentifyingInfo"] != null)
       memory.OtherInfo = item["OtherIdentifyingInfo"].ToString();
}

Upvotes: 1

Derek
Derek

Reputation: 8628

OtherIdentifyingInfo

Data type: string Access type: Read-only Additional data, beyond asset tag information, that can be used to identify a physical element. One example is bar code data associated with an element that also has an asset tag. If only bar code data is available and unique or able to be used as an element key, this property is be NULL and the bar code data is used as the class key in the tag property. This property is inherited from CIM_PhysicalElement.

You need to Check if the value is Null before you pass to string.

Upvotes: 3

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