在 Blazor Wasm 中调用 HttpPatch 失败之解决，加深理解 PATCH 及其非幂等性逻辑

[Route("api/[controller]")]
[ApiController]
public class PersonController : ControllerBase
{
    private List<PersonDataModel> _personList = new List<PersonDataModel>
    {
        new PersonDataModel { Id = 1, FirstName = "三儿", LastName = "张" },
        new PersonDataModel { Id = 2, FirstName = "四儿", LastName = "李" }
    };

    [HttpPatch("{id}")]
    public PersonDataModel Patch(int id, [FromBody]JsonPatchDocument<PersonDataModel> patch)
    {
        if (patch == null) return null;

        var personItem = _personList.FirstOrDefault(t => t.Id == id);
        if (personItem == null) return null;

        patch.ApplyTo(personItem);
        return personItem;
    }
}

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "|7551fbb9-4a1e3fd4cf6fdd94.",
    "errors": {
        "$": [
            "The JSON value could not be converted to Microsoft.AspNetCore.JsonPatch.JsonPatchDocument`1[Demo_Blazor_Wasm.Shared.PersonDataModel]. Path: $ | LineNumber: 0 | BytePositionInLine: 1."
        ]
    }
}

1. Add a package reference to Microsoft.AspNetCore.Mvc.NewtonsoftJson.
2. Change code in the startup to services.AddControllersWithViews().AddNewtonsoftJson();