访问 Json 序列化程序选项以避免在 Azure Functions v3 中序列化 null

Question

如何在 Azure Functions 中设置序列化程序以在序列化时忽略空值？

这是 v3 函数

我试过了

        JsonConvert.DefaultSettings = () => new JsonSerializerSettings
        {
            Formatting = Formatting.Indented,
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
            NullValueHandling = NullValueHandling.Ignore
        };

在我的函数的启动中

我现在开始认为 Newtonsoft 没有被用于 json

如何强制使用 Newtonsoft？

干杯

保罗

Answer 1

改编自Add JSON Options In HTTP Triggered Azure Functions

先决条件

You need ensure that all prerequisites are fulfilled as mentioned here

来自该文档页面：

Before you can use dependency injection, you must install the following NuGet packages:

Microsoft.Azure.Functions.Extensions

Microsoft.NET.Sdk.Functions package version 1.0.28 or later

Microsoft.Extensions.DependencyInjection (currently, only version 3.x and earlier supported)

注：

The guidance in this article applies only to C# class library functions, which run in-process with the runtime. This custom dependency injection model doesn't apply to .NET isolated functions, which lets you run .NET 5.0 functions out-of-process. The .NET isolated process model relies on regular ASP.NET Core dependency injection patterns.

代码

将 Startup class 添加到您的 Azure Function 项目，如下所示：

using System;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;

[assembly: FunctionsStartup(typeof(MyNamespace.Startup))]
namespace MyNamespace {
    public class Startup: FunctionsStartup {
        public override void Configure(IFunctionsHostBuilder builder) {
            builder.Services.AddMvcCore().AddJsonFormatters().AddJsonOptions(options => {
                // Adding json option to ignore null values.
                options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
            });
        }
    }
}

This will set the JSON option to ignore null values.

Answer 2

此问题的公认答案不适用于 Azure Functions v3+。您可以使用 Microsoft.AspNetCore.Mvc.NewtonsoftJson 包的 3.0+ 版本来设置 JSON 序列化程序选项。

参见：

访问 Json 序列化程序选项以避免在 Azure Functions v3 中序列化 null

Access Json Serializer options to avoid serializing null in Azure Functions v3

c#

json

azure

json.net

azure-functions

先决条件

代码