1,270 questions
you are looking at swagger's display of sample data. it always sets booleans to true, just as it it uses now for DateTime (which default to minimum)
Boolean is true by default ?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(294.40000000000003, 83%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMR%3C/text%3E%3C/svg%3E)
Marc Roussel
41
Reputation points
I created a class with a Boolean. When I instantiate it, my Boolean is true. I don't understand. I thought the default for Boolean was false ! Any ideas ?
Right now, I'm forced to use this attribute :
[
DefaultValue(false)]
public bool IsDelete { get; set; }
Developer technologies | .NET | .NET Runtime
{count} votes
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Viorel 122.6K Reputation points2022-10-10T12:55:22.657+00:00 How did you check it? How to reproduce the problem?
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Marc Roussel 41 Reputation points
2022-10-11T20:42:11.75+00:00 It's an API and there's no constructor nor anything setting the value before looking at it in Swagger. In this example I commented out the attribute to set it to false by default
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Viorel 122.6K Reputation points
2022-10-12T14:16:55.09+00:00 Maybe you should check it without that tool, and also find a dedicated forum.
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Accepted answer
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator2022-10-12T15:46:16.423+00:00 -
Marc Roussel 41 Reputation points
2022-10-14T18:04:04.447+00:00 Can you lead me to where Swagger sets Boolean to true ?
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Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator
2022-10-14T20:19:55.343+00:00 swagger-ui is typically a javascript react based ui. the webapi server returns the schema, not sample data. the swagger-ui generates the sample data from the schema. the schema is language independent and would know nothing about C# defaults.
swagger-ui source:
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1 additional answer
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Olaf Helper 47,436 Reputation points2022-10-10T13:01:18.56+00:00 See bool (C# reference): "The default value of the bool type is false"
There must be code setting the property to True-
Marc Roussel 41 Reputation points
2022-10-11T20:45:24.313+00:00 After all these years programming C#, this is really what I think but since I have this problem I honestly don't understand.
No constructors, nothing setting this value anywhere and it's a totally new code that does nothing yet. I just ran the app and saw the TRUE value in Swagger as shown in response to Viorel-1 -
Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator
2022-10-14T20:26:58.037+00:00 again the swagger-ui code is javascript not C#.
in javascript variables/properties default to undefined. undefined is not valid json, so swagger-ui must set every json property.
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