How to access public static DTO in class C#

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I'm trying to create a DTO called "device" that I'm trying to add to a list called "deviceList". However, when I try to add my device to the deviceList, it tells me 'The name 'device' does not exist in the current context'.

public static device_DTO device= new device_DTO()
{
    DeviceTypeId = 33,
    DeviceTypeName = "BPD",
    Product = "Very Good Meter",
    DeviceClass = "Battery Powered Device",
    Form = "2S",
    HardwareVersion = "HW V3"
};

public static List<device_DTO> deviceList= new List<device_DTO>();
deviceList.Add(device);

What I have tried:

Making the variables non-static, however that did nothing.

Posted 2-Dec-20 3:35am

stevenlam505

Updated 2-Dec-20 4:18am

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Comments

BabyYoda 2-Dec-20 9:58am

So this line
deviceList.Add(device);
says device does not exist. Well, the compiler is not lying. It does not exist. You need to write code to make it exist. Although I imagine you would actually get a null reference exception so it feels like you're leaving something out.

Richard MacCutchan 2-Dec-20 10:15am

You need to put the last line inside a method for it to do anything. I just tested it in the correct place and it works fine.

3 solutions

Solution 2

You can't write executable code outside of a method, and you can't declare public or private variables inside a method.
So one of these is in the wrong place:

C#

public static device_DTO device= new device_DTO() {...}
public static List<device_DTO> deviceList= new List<device_DTO>();

Or

C#

deviceList.Add(device);

And there is a very good chance than none of those should be static anyway ...

Posted 2-Dec-20 4:15am

OriginalGriff

Solution 3

You need to fully qualify "device". "device" is just the name of the field on the class it was defined on. To use it you need to use "ClassName.device" rather than just "device".

However I have to question the logic in adding a static item to a List, there is probably a general issue with what it is you're trying to achieve, or how you are trying to achieve it.

Posted 2-Dec-20 4:18am

F-ES Sitecore

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Richard Deeming · Accepted Answer · 2020-12-02T04:14:00

You haven't shown where you have placed the Add line. If it's directly within the class, that's not allowed - code must be within a method.

If you want a static list initialized with a single item, you can use a collection initializer:

C#

public static readonly List<device_DTO> deviceList = new List<device_DTO>
{
    new device_DTO
    {
        DeviceTypeId = 33,
        DeviceTypeName = "BPD",
        Product = "Very Good Meter",
        DeviceClass = "Battery Powered Device",
        Form = "2S",
        HardwareVersion = "HW V3"
    }
};

However, you need to check how you are using the list to decide whether a static variable is the correct choice here.