45 lines
1.6 KiB
C#
45 lines
1.6 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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namespace CommunityToolkit.Mvvm.ComponentModel;
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/// <summary>
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/// An attribute that can be used to support <see cref="ObservablePropertyAttribute"/> in generated properties, when applied to
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/// fields contained in a type that is inheriting from <see cref="ObservableValidator"/> and using any validation attributes.
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/// When this attribute is used, the generated property setter will also call <see cref="ObservableValidator.ValidateProperty(object?, string)"/>.
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/// This allows generated properties to opt-in into validation behavior without having to fallback into a full explicit observable property.
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/// <para>
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/// This attribute can be used as follows:
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/// <code>
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/// partial class MyViewModel : ObservableValidator
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/// {
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/// [ObservableProperty]
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/// [NotifyDataErrorInfo]
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/// [Required]
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/// [MinLength(2)]
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/// private string username;
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/// }
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/// </code>
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/// </para>
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/// And with this, code analogous to this will be generated:
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/// <code>
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/// partial class MyViewModel
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/// {
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/// [Required]
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/// [MinLength(2)]
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/// public string Username
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/// {
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/// get => username;
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/// set => SetProperty(ref username, value, validate: true);
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/// }
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/// }
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/// </code>
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/// </summary>
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[AttributeUsage(AttributeTargets.Field | AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
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public sealed class NotifyDataErrorInfoAttribute : Attribute
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{
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}
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