c# - 如何在 JsonPatchDocument.Applyto 中使用 ModelState

Question

我在 Microsoft 文档和许多示例中看​​到他们调用 JsonPatchDocument.ApplyTo(patchObject, ModelState)，但我似乎无法让它以这种方式构建。我收到一个构建错误，提示“错误 CS1503 参数 2:无法从‘System.Web.Http.ModelBinding.ModelStateDictionary’转换为‘System.Action’”

我引用了 Microsoft.AspNetCore.JsonPatch v2.2.0，示例代码来自这里:

https://docs.microsoft.com/en-us/aspnet/core/web-api/jsonpatch?view=aspnetcore-2.2

[HttpPatch]
public IActionResult JsonPatchWithModelState(
    [FromBody] JsonPatchDocument<Customer> patchDoc)
{
    if (patchDoc != null)
    {
        var customer = CreateCustomer();

        patchDoc.ApplyTo(customer, ModelState);

        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        return new ObjectResult(customer);
    }
    else
    {
        return BadRequest(ModelState);
    }
}

Answer 1

您必须为 .Net Core 添加 Newtonsoft 包

Microsoft.AspNetCore.Mvc.NewtonsoftJson

dotnet add package Microsoft.AspNetCore.Mvc.NewtonsoftJson