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CompareAttribute works now (#20749)

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Pranav K 2020-11-24 14:54:27 -08:00 committed by GitHub
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aspnetcore/blazor/forms-validation.md
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@ -1047,10 +1047,14 @@ The [`Microsoft.AspNetCore.Components.DataAnnotations.Validation`](https://www.n
> [!NOTE]
> The [`Microsoft.AspNetCore.Components.DataAnnotations.Validation`](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.DataAnnotations.Validation) package has a latest version of *release candidate* at [Nuget.org](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.DataAnnotations.Validation). Continue to use the *experimental* release candidate package at this time. The package's assembly might be moved to either the framework or the runtime in a future release. Watch the [Announcements GitHub repository](https://github.com/aspnet/Announcements), the [dotnet/aspnetcore GitHub repository](https://github.com/dotnet/aspnetcore), or this topic section for further updates.
### [CompareProperty] attribute
::: moniker range="< aspnetcore-5.0"
### `[CompareProperty]` attribute
The <xref:System.ComponentModel.DataAnnotations.CompareAttribute> doesn't work well with the <xref:Microsoft.AspNetCore.Components.Forms.DataAnnotationsValidator> component because it doesn't associate the validation result with a specific member. This can result in inconsistent behavior between field-level validation and when the entire model is validated on a submit. The [`Microsoft.AspNetCore.Components.DataAnnotations.Validation`](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.DataAnnotations.Validation) *experimental* package introduces an additional validation attribute, `ComparePropertyAttribute`, that works around these limitations. In a Blazor app, `[CompareProperty]` is a direct replacement for the [`[Compare]`](xref:System.ComponentModel.DataAnnotations.CompareAttribute) attribute.
::: moniker-end
### Nested models, collection types, and complex types
Blazor provides support for validating form input using data annotations with the built-in <xref:Microsoft.AspNetCore.Components.Forms.DataAnnotationsValidator>. However, the <xref:Microsoft.AspNetCore.Components.Forms.DataAnnotationsValidator> only validates top-level properties of the model bound to the form that aren't collection- or complex-type properties.