ASP.NET Web API 中带有可选参数的属性路由 [英] Attribute routing with optional parameters in ASP.NET Web API

问题描述

我正在尝试使用 Web API 2 属性路由来设置自定义 API.我已经让我的路线工作，以便我的函数被调用，但出于某种原因，我需要传入我的第一个参数才能正常工作.以下是我想要支持的网址:

I'm trying to use Web API 2 attribute routing to set up a custom API. I've got my route working such that my function gets called, but for some reason I need to pass in my first parameter for everything to work properly. The following are the URLs I want to support:

http://mysite/api/servicename/parameter1
http://mysite/api/servicename/parameter1?parameter2=value2
http://mysite/api/servicename/parameter1?parameter2=value2&parameter3=value3
http://mysite/api/servicename/parameter1?parameter2=value2&parameter3=value3&p4=v4

最后 3 个 URL 有效，但第一个显示未在与请求匹配的控制器‘控制器名称’上找到任何操作."

The last 3 URLs work but the first one says "No action was found on the controller 'controller name' that matches the request."

我的控制器如下所示:

public class MyServiceController : ApiController
{
    [Route("api/servicename/{parameter1}")]
    [HttpGet]
    public async Task<ReturnType> Get(string parameter1, DateTime? parameter2, string parameter3 = "", string p4 = "")
    {
        // process
    }
}

推荐答案

Web API 需要显式设置可选值，即使对于可为空的类型...因此您可以尝试设置以下内容，您应该会看到您的第一个请求成功

Web API requires to explicitly set optional values even for nullable types...so you can try setting the following and you should see your 1st request succeed

DateTime? parameter2 = null

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