Server side validation problem - float value - validation

Question

I have a problem with data validation in my application.
Im using a Razor Pages and .Net Core 3.0 framework with EF Core orm.
In my model I have two properties:
public float WireCrosssection { get; set; }
public float CableLength { get; set; }
On page, I have inputs for them:
<div class="form-group">
<label asp-for="Cable.WireCrosssection"></label>
<input class="form-control" asp-for="Cable.WireCrosssection" />
<span class="text-danger" asp-validation-for="Cable.WireCrosssection"></span>
</div>
<div class="form-group">
<label asp-for="Cable.CableLength"></label>
<input class="form-control" asp-for="Cable.CableLength" />
<span class="text-danger" asp-validation-for="Cable.CableLength"></span>
</div>
Client side validation is turned on and this validation doesn't report problems with the form but the server side one do (ModelState.IsValid is false).
The number is provided with dot (".").
Any suggestions?

Answer 1

Be sure you have added the validation script in your view.
#{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
Here is a simple demo like below:
1.Model:
public class Test
{
public float WireCrosssection { get; set; }
public float CableLength { get; set; }
}
2.View:
#model Test
<form asp-action="Index">
<div class="form-group">
<label asp-for="WireCrosssection"></label>
<input class="form-control" asp-for="WireCrosssection" />
<span class="text-danger" asp-validation-for="WireCrosssection"></span>
</div>
<div class="form-group">
<label asp-for="CableLength"></label>
<input class="form-control" asp-for="CableLength" />
<span class="text-danger" asp-validation-for="CableLength"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
#section Scripts {
#{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
3.Controller:
[HttpPost]
public IActionResult Index(Test test)
{
//..
}
4.Result:
Reference:Client Side Validation

Answer 2

Ok, I solved the issue. The problem was a mismatch in culture on the server side and on the client side. Client side validation is written in "en-US" culture. To set the culture on the ASP.NET Core application you need to add following code to the Configure method in the Startup.cs class:
var cultureInfo = new CultureInfo("en-US");
CultureInfo.DefaultThreadCurrentCulture = cultureInfo;
CultureInfo.DefaultThreadCurrentUICulture = cultureInfo;