多个可选参数Web API属性路由 [英] Multiple optional parameters web api attribute routing

问题描述

我是属性路由的新手，不确定这是否可行.

Hi guys i am new to attribute routing and not sure if this is even possible.

我所拥有的是一条属性路由，它可以像这样

What i have is an attribute route which works fine like this

[HttpGet]
[Route("GetIssuesByFlag/{flag:int=3}")]
public IEnumerable<IssueDto> GetIssuesByFlag(int flag)

但是现在我想添加一些额外的可选参数来缩小搜索范围，所以我想添加2个额外的可选参数.

now however i want to add some extra optional parameters to narrow down my search so i want to add 2 extra optional parameters.

我尝试过的事情:

[HttpGet]
[Route("GetIssuesByFlag/{flag:int=3?}/{categoryId:int?}/{tagIds?}")]
public IEnumerable<IssueDto> GetIssuesByFlag(int flag , int? categoryId = null, int?[] tagIds = null)

如果我的电话是/api/controller/1/2，这可以正常工作 但在/api/controller/1

This works fine if my call is /api/controller/1/2 but fails with 404 when it comes to /api/controller/1

我该如何实现?

Nkosi的答案在下面很奏效，但是还需要进行额外的修改.

Edit 1: Nkosi's answer bellow worked however an extra modification was needed.

[HttpGet]
[Route("GetIssuesByFlag/{flag:int=3}/{tagIds?}/{categoryId:int?}")]
public IEnumerable<IssueDto> GetIssuesByFlag(int flag , List<int> tagIds, int? categoryId = null )

列表或数组必须是第二个，因为如果没有提供值，则列表或数组将自动为null，并且不能使用= null将其标记为可选

The list or array must be second as it is automatically null if no value is provided and cant be marked as optional with = null

推荐答案

{flag:int=3?}是问题.它是操作中具有默认值的可选{flag:int?}或{flag:int=3}.

{flag:int=3?} is the problem. it is either optional {flag:int?} with the default value in the action or {flag:int=3}.

[HttpGet]
Route("GetIssuesByFlag/{flag:int=3}/{categoryId:int?}/{tagIds?}")]
public IEnumerable<IssueDto> GetIssuesByFlag(int flag , int? categoryId = null, int?[] tagIds = null)

您当前有3个可选参数.当您只有1值路由表时，将不知道您要指的是哪个可选参数，因此404

You currently have 3 optional parameters. when you have just the 1 value routing table wont know which optional parameter you are referring to, hence the 404

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