C#C
C#•3y ago
Eistee

❔ Razor Pages Session for revalidating Page Model

Can someone help me to configure the Session for Razor Pages, that I can use TryValidateModel()?

TryValidateModel(this);"

is throwing a InvalidOperationException: Session has not been configured for this application or request.error?

I can't find any hint about the online
https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.razorpages.pagemodel.tryvalidatemodel?view=aspnetcore-7.0

The debugger is actually stepping over it, but the trace says:
Microsoft.AspNetCore.Http.DefaultHttpContext.get_Session()
Microsoft.Extensions.Internal.PropertyHelper.CallNullSafePropertyGetter<TDeclaringType, TValue>(Func<TDeclaringType, TValue> getter, object target)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationEntry.get_Model()
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)


The server side page Post method looks like this:
public async Task<IActionResult> OnPostAsync()
{
    if (!ModelState.IsValid)
    {
        for (int x = ThirdPartyInformations.Count -1; x >= 0; x--) 
        {
            if (ThirdPartyInformations[x].HiddenEntry == true)
            {
                ThirdPartyInformations.RemoveAt(x);
            }
        }

        ModelState.Clear();
        TryValidateModel(this); // <-- 
    }

    if (!ModelState.IsValid ||
    ....
PageModel.TryValidateModel Method (Microsoft.AspNetCore.Mvc.RazorPa...
Validates the specified model instance.
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