I have in database a empty GUID. But if I execute this code: List listOfOneResource = await _resourceService.GetResourcesById( new List { new Guid(welcome.WelcomePopupImage) }); Guid fileId = listOfOneResource.First().FileId ?? Guid.Empty; // this should never be empty in case of an image type resource string fileIdString = fileId.ToString(); welcome.WelcomePopupImage = _appSettings.MedicalBaseUrl + "/resources/image/" + fileIdString + ".jpg" ; I get an error on this line: List listOfOneResource = await _resourceService.GetResourcesById( new List { new Guid(welcome.WelcomePopupImage) }); "message": "Unrecognized Guid format.", So what I have to change?

Guid output; if (Guid.TryParse(input, out output)) { //Logic }

hi You define the List in the wrong way var guid = new Guid(welcome.WelcomePopupImage); if (guid != null ) { List guids = new List (); var listOfOneResource = await _resourceService.GetResourcesById(guids); } Thanks and regards

Hi, Please use this link, https://ozanecare.com/how-to-check-guid-is-null-or-empty/

Try Guid.Empty https://docs.microsoft.com/en-us/dotnet/api/system.guid.empty?view=netcore-3.1

Answers

How to check for empty GUID

Albert Newton

1.6k

I have in database a empty GUID.

But if I execute this code:

List listOfOneResource = await _resourceService.GetResourcesById(new List { new Guid(welcome.WelcomePopupImage) });
Guid fileId = listOfOneResource.First().FileId ?? Guid.Empty; // this should never be empty in case of an image type resource
string fileIdString = fileId.ToString();
welcome.WelcomePopupImage = _appSettings.MedicalBaseUrl + "/resources/image/" + fileIdString + ".jpg";

I get an error on this line:

List listOfOneResource = await _resourceService.GetResourcesById(new List { new Guid(welcome.WelcomePopupImage) });

"message": "Unrecognized Guid format.",

So what I have to change?

Answers (4)

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