Annotation [Required] for the DateTime in class model

sblb 1,166

Hi,

I want to put the data annotation for the DateTime but it is not taken into account

[Required]  
public DateTime DateCrea { get; set; }

i.e. in my application if I don't enter a value I can validate my page (e.g. creation).
Do you have any idea where the problem comes from? Should I add something specific for the DateTime?

Thanks in advance

AgaveJoe 26,191 Reputation points

2022-09-29T15:01:56.853+00:00

Your question is not clear and you did not provide all the relevant code. Are you asking about an Entity Framework class model, an entity? A View model in your Blazor application? Model binding in Web API? Is DateCrea a column in a table that cannot be null or are you expecting a required user message in a Blazor application?

Please try reading the openly published reference documentation.
ASP.NET Core Blazor forms and input components
Required and optional properties
Zhi Lv - MSFT 32,011 Reputation points Microsoft Vendor

2022-09-30T06:14:32.85+00:00

Hi @sblb ,

in my application if I don't enter a value I can validate my page (e.g. creation).
Do you have any idea where the problem comes from? Should I add something specific for the DateTime?

It is better to share your Form code, so that we can know how do you select the DateTime and show the validation message?

I assume perhaps you are using InputText control to enter the Date time, right? If that is the case, try to use the InputDate control.

Best regards,
Dillion

sblb 1,166

Hi,
the form to rendering the DateCrea is

 <div class="col-md-6">  
                        <RadzenDatePicker style="width: 100%;" Name="Date de Creation" @bind-Value="@dev.DateCrea" />  
                        <ValidationMessage For="@(() => dev.DateCrea)" />  
                    </div>

I use Radzen.Blazor package.

AgaveJoe 26,191 Reputation points

2022-09-30T12:13:48.507+00:00

Radzen support is a better place to get help with the RadzenDatePicker.

https://forum.radzen.com/
https://www.radzen.com/documentation/blazor/datepicker/

2 answers

sblb 1,166 Reputation points

2022-09-29T15:42:15.46+00:00

Are you asking about an Entity Framework class model

yes

A View model in your Blazor application?

yes

Model binding in Web API?

no

Is DateCrea a column in a table ... are you expecting a required user message in a Blazor application?

yes, I expect a message, so the user must fill in the DateCrea field.
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AgaveJoe 26,191 Reputation points

2022-09-29T19:24:03.387+00:00

Entity framework class models (entities) are not or should not be part of the UI. Please make an effort to learn the fundamentals. There is no reason to copy content from beginning level tutorials to these forums.
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Bruce (SqlWork.com) 55,366 Reputation points

2022-09-29T15:57:35.753+00:00

show your form. as a date time is not nullable, its required by default.
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sblb 1,166 Reputation points

2022-09-29T16:11:47.247+00:00

The DateCrea is declared after the migration as : DateCrea = table.Column<DateTime>(type: "datetime2", nullable: false),

In this case DateCrea is required. I don't understand?

AgaveJoe 26,191 Reputation points

2022-09-29T19:29:21.347+00:00

The table column does not allow null which has nothing to do with a user entering data in a form. I provided two link in my first post which covers this information.
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