RDG009：嵌套 AsParameters 无效

	值
规则 ID	RDG009
修复是中断修复还是非中断修复	非中断

原因

当终结点包含无效的嵌套 [AsParameters] 时，请求委托生成器发出此诊断。

规则说明

通过 [AsParameters] 特性用于代理项绑定的类型不得包含也使用 [AsParameters] 特性进行批注的嵌套类型：

using System.Text.Json.Serialization;

var builder = WebApplication.CreateSlimBuilder();

var todos = new[]
{
    new Todo(1, "Write tests", DateTime.UtcNow.AddDays(2)),
    new Todo(2, "Fix tests",DateTime.UtcNow.AddDays(1))
};

builder.Services.AddSingleton(todos);
builder.Services.ConfigureHttpJsonOptions(options =>
{
    options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
});

var app = builder.Build();

app.MapGet("/v1/todos/{id}", ([AsParameters] TodoItemRequest request) =>
{
     return request.Todos.ToList().Find(todoItem => todoItem.Id == request.Id) is Todo todo
    ? Results.Ok(todo)
    : Results.NotFound();
});

app.Run();

struct TodoItemRequest
{
    public int Id { get; set; }
    [AsParameters]
    public Todo[] Todos { get; set; }
}

internal record Todo(int Id, string Task, DateTime DueDate);

[JsonSerializable(typeof(Todo[]))]
internal partial class AppJsonSerializerContext : JsonSerializerContext
{
}

如何解决冲突

删除嵌套的 AsParameters 嵌套特性：

using System.Text.Json.Serialization;

var builder = WebApplication.CreateSlimBuilder();
var todos = new[]
{
    new Todo(1, "Write tests", DateTime.UtcNow.AddDays(2)),
    new Todo(2, "Fix tests",DateTime.UtcNow.AddDays(1))
};
builder.Services.AddSingleton(todos);
builder.Services.ConfigureHttpJsonOptions(options =>
{
    options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
});

var app = builder.Build();

app.MapGet("/v1/todos/{id}", ([AsParameters] TodoItemRequest request) =>
{
    return request.Todos.ToList().Find(todoItem => todoItem.Id == request.Id) is Todo todo
    ? Results.Ok(todo)
    : Results.NotFound();
});

app.Run();

struct TodoItemRequest
{
    public int Id { get; set; }
    //[AsParameters]
    public Todo[] Todos { get; set; }
}

internal record Todo(int Id, string Task, DateTime DueDate);

[JsonSerializable(typeof(Todo[]))]
internal partial class AppJsonSerializerContext : JsonSerializerContext
{
}

何时禁止显示警告

此警告无法禁止显示。