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JsonPatchExtensions.cs
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JsonPatchExtensions.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.JsonPatch;
using Microsoft.AspNetCore.Mvc.ModelBinding;
namespace Microsoft.AspNetCore.Mvc;
/// <summary>
/// Extensions for <see cref="JsonPatchDocument{T}"/>
/// </summary>
public static class JsonPatchExtensions
{
/// <summary>
/// Applies JSON patch operations on object and logs errors in <see cref="ModelStateDictionary"/>.
/// </summary>
/// <param name="patchDoc">The <see cref="JsonPatchDocument{T}"/>.</param>
/// <param name="objectToApplyTo">The entity on which <see cref="JsonPatchDocument{T}"/> is applied.</param>
/// <param name="modelState">The <see cref="ModelStateDictionary"/> to add errors.</param>
public static void ApplyTo<T>(
this JsonPatchDocument<T> patchDoc,
T objectToApplyTo,
ModelStateDictionary modelState) where T : class
{
ArgumentNullException.ThrowIfNull(patchDoc);
ArgumentNullException.ThrowIfNull(objectToApplyTo);
ArgumentNullException.ThrowIfNull(modelState);
patchDoc.ApplyTo(objectToApplyTo, modelState, prefix: string.Empty);
}
/// <summary>
/// Applies JSON patch operations on object and logs errors in <see cref="ModelStateDictionary"/>.
/// </summary>
/// <param name="patchDoc">The <see cref="JsonPatchDocument{T}"/>.</param>
/// <param name="objectToApplyTo">The entity on which <see cref="JsonPatchDocument{T}"/> is applied.</param>
/// <param name="modelState">The <see cref="ModelStateDictionary"/> to add errors.</param>
/// <param name="prefix">The prefix to use when looking up values in <see cref="ModelStateDictionary"/>.</param>
public static void ApplyTo<T>(
this JsonPatchDocument<T> patchDoc,
T objectToApplyTo,
ModelStateDictionary modelState,
string prefix) where T : class
{
ArgumentNullException.ThrowIfNull(patchDoc);
ArgumentNullException.ThrowIfNull(objectToApplyTo);
ArgumentNullException.ThrowIfNull(modelState);
patchDoc.ApplyTo(objectToApplyTo, jsonPatchError =>
{
var affectedObjectName = jsonPatchError.AffectedObject.GetType().Name;
var key = string.IsNullOrEmpty(prefix) ? affectedObjectName : prefix + "." + affectedObjectName;
modelState.TryAddModelError(key, jsonPatchError.ErrorMessage);
});
}
}