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Rick-Anderson merged 7 commits into from
Mar 3, 2023
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Draft-WIP: ModelState.AddModelError /2 #28445

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IResult model binding and testing /2
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26 changes: 24 additions & 2 deletions aspnetcore/mvc/models/validation.md
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Expand Up @@ -5,7 +5,7 @@ description: Learn about model validation in ASP.NET Core MVC and Razor Pages.
monikerRange: '>= aspnetcore-3.1'
ms.author: riande
ms.custom: mvc
ms.date: 02/02/2022
ms.date: 02/17/2023
uid: mvc/models/validation
---
# Model validation in ASP.NET Core MVC and Razor Pages
Expand Down Expand Up @@ -158,7 +158,9 @@ To implement remote validation:
1. In the model class, annotate the property with a `[Remote]` attribute that points to the validation action method, as shown in the following example:

:::code language="csharp" source="~/mvc/models/validation/samples/6.x/ValidationSample/Models/User.cs" id="snippet_Email":::


[Server side validation](#custom-validation) also needs to be implemented for clients that have disabled JavaScript.

### Additional fields

The <xref:Microsoft.AspNetCore.Mvc.RemoteAttribute.AdditionalFields%2A> property of the `[Remote]` attribute lets you validate combinations of fields against data on the server. For example, if the `User` model had `FirstName` and `LastName` properties, you might want to verify that no existing users already have that pair of names. The following example shows how to use `AdditionalFields`:
Expand Down Expand Up @@ -209,6 +211,26 @@ The preceding example works only with `Movie` types. Another option for class-le

:::code language="csharp" source="~/mvc/models/validation/samples/6.x/ValidationSample/Models/ValidatableMovie.cs" id="snippet_Class" highlight="1,26-34":::

## Custom validation

The following code shows how to add a model error after examining the model:

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/RazorPages/models/ModelStateError/Pages/Contacts/Create.cshtml.cs" id="snippet_5":::

The following code implements the validation test in a controller:

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/mvc/models/ModelStateError/Controllers/ContactsController.cs" id="snippet_5":::

The following code verifies the phone number and email are unique:

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/RazorPages/models/ModelStateError/Pages/Contacts/Create.cshtml.cs" id="snippet_1":::

The following code implements the validation test in a controller:

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/mvc/models/ModelStateError/Controllers/ContactsController.cs" id="snippet_4":::

Checking for a unique phone number or email is typically also done with [remote validation](#remote-attribute).

## Top-level node validation

Top-level nodes include:
Expand Down