如何将多个参数传递给 ASP.NET Core 中的 get 方法

你也可以使用这个：

// GET api/user/firstname/lastname/address
[HttpGet("{firstName}/{lastName}/{address}")]
public string GetQuery(string id, string firstName, string lastName, string address)
{
    return $"{firstName}:{lastName}:{address}";
}

注意：请参阅 metalheart 和 Mark Hughes 的答案以获得可能更好的方法。

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为什么不只使用一个控制器动作？

public string Get(int? id, string firstName, string lastName, string address)
{
   if (id.HasValue)
      GetById(id);
   else if (string.IsNullOrEmpty(address))
      GetByName(firstName, lastName);
   else
      GetByNameAddress(firstName, lastName, address);
}

另一种选择是使用属性路由，但是您需要使用不同的 URL 格式：

//api/person/byId?id=1
[HttpGet("byId")] 
public string Get(int id)
{
}

//api/person/byName?firstName=a&lastName=b
[HttpGet("byName")]
public string Get(string firstName, string lastName, string address)
{
}

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要从 URL 中解析搜索参数，您需要使用 [FromQuery] 注释控制器方法参数，例如：

[Route("api/person")]
public class PersonController : Controller
{
    [HttpGet]
    public string GetById([FromQuery]int id)
    {

    }

    [HttpGet]
    public string GetByName([FromQuery]string firstName, [FromQuery]string lastName)
    {

    }

    [HttpGet]
    public string GetByNameAndAddress([FromQuery]string firstName, [FromQuery]string lastName, [FromQuery]string address)
    {

    }
}

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我建议使用单独的 dto 对象作为参数：

[Route("api/[controller]")]
public class PersonController : Controller
{
    public string Get([FromQuery] GetPersonQueryObject request)
    {
        // Your code goes here
    }
}

public class GetPersonQueryObject 
{
    public int? Id { get; set; }
    public string Firstname { get; set; }
    public string Lastname { get; set; }
    public string Address { get; set; }
}

Dotnet 会将字段映射到您的对象。

这将使传递参数变得更加容易，并产生更清晰的代码。

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我认为最简单的方法是简单地使用 AttributeRouting。

[Route("api/YOURCONTROLLER/{paramOne}/{paramTwo}")]
    public string Get(int paramOne, int paramTwo)
    {
        return "The [Route] with multiple params worked";
    }

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在 web api 核心中使用多个参数调用 get

  [ApiController]
    [Route("[controller]")]
    public class testController : Controller
    {
    
      [HttpGet]
        [Route("testaction/{id:int}/{startdate}/{enddate}")]
        public IEnumerable<classname> test_action(int id, string startdate, string enddate)
        {

            return List_classobject;
        }
    
    }

In web browser
https://Yourdomain/test/testaction/3/2010-09-30/2012-05-01

---

方法应该是这样的：

[Route("api/[controller]")]
public class PersonsController : Controller
{
    [HttpGet("{id}")]
    public Person Get(int id)

    [HttpGet]
    public Person[] Get([FromQuery] string firstName, [FromQuery] string lastName, [FromQuery] string address)
}

请注意，第二种方法返回一个对象数组，控制器名称为复数形式（Persons not Person）。

因此，如果您想通过 id 获取资源，它将是：

api/persons/1

如果您想通过一些搜索条件（例如名字等）来获取对象，您可以像这样进行搜索：

api/persons?firstName=Name&...

如果你想接受那个人的订单（例如），它应该是这样的：

api/persons/1/orders?skip=0&take=20

和在同一个控制器中的方法：

    [HttpGet("{personId}/orders")]
    public Orders[] Get(int personId, int skip, int take, etc..)

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最简单的方法，

控制器：

[HttpGet("empId={empId}&startDate={startDate}&endDate={endDate}")]
 public IEnumerable<Validate> Get(int empId, string startDate, string endDate){}

邮递员要求：

{router}/empId=1&startDate=2020-20-20&endDate=2020-20-20

学习点：请求精确模式将被控制器接受。

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要在另一个答案之后添加有关您在评论中询问的重载的更多详细信息，这里有一个摘要。 ApiController 中的注释显示每个 GET 查询将调用哪个操作：

public class ValuesController : ApiController
{
    // EXPLANATION: See the view for the buttons which call these WebApi actions. For WebApi controllers, 
    //          there can only be one action for a given HTTP verb (GET, POST, etc) which has the same method signature, (even if the param names differ) so
    //          you can't have Get(string height) and Get(string width), but you can have Get(int height) and Get(string width).
    //          It isn't a particularly good idea to do that, but it is true. The key names in the query string must match the
    //          parameter names in the action, and the match is NOT case sensitive. This demo app allows you to test each of these
    //          rules, as follows:
    // 
    // When you send an HTTP GET request with no parameters (/api/values) then the Get() action will be called.
    // When you send an HTTP GET request with a height parameter (/api/values?height=5) then the Get(int height) action will be called.
    // When you send an HTTP GET request with a width parameter (/api/values?width=8) then the Get(string width) action will be called.
    // When you send an HTTP GET request with height and width parameters (/api/values?height=3&width=7) then the 
    //          Get(string height, string width) action will be called.
    // When you send an HTTP GET request with a depth parameter (/api/values?depth=2) then the Get() action will be called
    //          and the depth parameter will be obtained from Request.GetQueryNameValuePairs().
    // When you send an HTTP GET request with height and depth parameters (/api/values?height=4&depth=5) then the Get(int height) 
    //          action will be called, and the depth parameter would need to be obtained from Request.GetQueryNameValuePairs().
    // When you send an HTTP GET request with width and depth parameters (/api/values?width=3&depth=5) then the Get(string width) 
    //          action will be called, and the depth parameter would need to be obtained from Request.GetQueryNameValuePairs().
    // When you send an HTTP GET request with height, width and depth parameters (/api/values?height=7&width=2&depth=9) then the 
    //          Get(string height, string width) action will be called, and the depth parameter would need to be obtained from 
    //          Request.GetQueryNameValuePairs().
    // When you send an HTTP GET request with a width parameter, but with the first letter of the parameter capitalized (/api/values?Width=8) 
    //          then the Get(string width) action will be called because the case does NOT matter.
    // NOTE: If you were to uncomment the Get(string height) action below, then you would get an error about there already being  
    //          a member named Get with the same parameter types. The same goes for Get(int id).
    //
    // ANOTHER NOTE: Using the nullable operator (e.g. string? paramName) you can make optional parameters. It would work better to
    //          demonstrate this in another ApiController, since using nullable params and having a lot of signatures is a recipe
    //          for confusion.

    // GET api/values
    public IEnumerable<string> Get()
    {
        return Request.GetQueryNameValuePairs().Select(pair => "Get() => " + pair.Key + ": " + pair.Value);
        //return new string[] { "value1", "value2" };
    }

    //// GET api/values/5
    //public IEnumerable<string> Get(int id)
    //{
    //    return new string[] { "Get(height) => height: " + id };
    //}

    // GET api/values?height=5
    public IEnumerable<string> Get(int height) // int id)
    {
        return new string[] { "Get(height) => height: " + height };
    }

    // GET api/values?height=3
    public IEnumerable<string> Get(string height)
    {
        return new string[] { "Get(height) => height: " + height };
    }

    //// GET api/values?width=3
    //public IEnumerable<string> Get(string width)
    //{
    //    return new string[] { "Get(width) => width: " + width };
    //}

    // GET api/values?height=4&width=3
    public IEnumerable<string> Get(string height, string width)
    {
        return new string[] { "Get(height, width) => height: " + height + ", width: " + width };
    }
}

如果您想知道，您只需要一条路线：

    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );

你可以用这个 MVC 视图或类似的东西来测试它。是的，我知道您不应该将 JavaScript 与标记混合使用，而且我没有像往常那样使用引导程序，但这仅用于演示目的。

<div class="jumbotron">
    <h1>Multiple parameters test</h1>
    <p class="lead">Click a link below, which will send an HTTP GET request with parameters to a WebAPI controller.</p>
</div>
<script language="javascript">
    function passNothing() {
        $.get("/api/values", function (data) { alert(data); });
    }

    function passHeight(height) {
        $.get("/api/values?height=" + height, function (data) { alert(data); });
    }

    function passWidth(width) {
        $.get("/api/values?width=" + width, function (data) { alert(data); });
    }

    function passHeightAndWidth(height, width) {
        $.get("/api/values?height=" + height + "&width=" + width, function (data) { alert(data); });
    }

    function passDepth(depth) {
        $.get("/api/values?depth=" + depth, function (data) { alert(data); });
    }

    function passHeightAndDepth(height, depth) {
        $.get("/api/values?height=" + height + "&depth=" + depth, function (data) { alert(data); });
    }

    function passWidthAndDepth(width, depth) {
        $.get("/api/values?width=" + width + "&depth=" + depth, function (data) { alert(data); });
    }

    function passHeightWidthAndDepth(height, width, depth) {
        $.get("/api/values?height=" + height + "&width=" + width + "&depth=" + depth, function (data) { alert(data); });
    }

    function passWidthWithPascalCase(width) {
        $.get("/api/values?Width=" + width, function (data) { alert(data); });
    }
</script>
<div class="row">
    <button class="btn" onclick="passNothing();">Pass Nothing</button>
    <button class="btn" onclick="passHeight(5);">Pass Height of 5</button>
    <button class="btn" onclick="passWidth(8);">Pass Width of 8</button>
    <button class="btn" onclick="passHeightAndWidth(3, 7);">Pass Height of 3 and Width of 7</button>
    <button class="btn" onclick="passDepth(2);">Pass Depth of 2</button>
    <button class="btn" onclick="passHeightAndDepth(4, 5);">Pass Height of 4 and Depth of 5</button>
    <button class="btn" onclick="passWidthAndDepth(3, 5);">Pass Width of 3 and Depth of 5</button>
    <button class="btn" onclick="passHeightWidthAndDepth(7, 2, 9);">Pass Height of 7, Width of 2 and Depth of 9</button>
    <button class="btn" onclick="passHeightWidthAndDepth(7, 2, 9);">Pass Height of 7, Width of 2 and Depth of 9</button>
    <button class="btn" onclick="passWidthWithPascalCase(8);">Pass Width of 8, but with Pascal case</button>
</div>

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您可以简单地执行以下操作：

    [HttpGet]
    public async Task<IActionResult> GetAsync()
    {
        string queryString = Request.QueryString.ToString().ToLower();

        return Ok(await DoMagic.GetAuthorizationTokenAsync(new Uri($"https://someurl.com/token-endpoint{queryString}")));
    }

如果您需要单独访问每个元素，只需参考 Request.Query。

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这对我有用

[HttpGet("{data}/{whereList}")]
    public JsonResult GetFieldsData([FromQuery]  string data, [FromQuery]  string whereList)

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https://i.stack.imgur.com/tgRBl.png

NB-我删除了 FromURI 。我仍然可以从 URL 传递值并获得结果。如果有人知道使用 fromuri 的好处，请告诉我

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    public HttpResponseMessage Get(int id,string numb)
    {

        using (MarketEntities entities = new MarketEntities())
        {
          var ent=  entities.Api_For_Test.FirstOrDefault(e => e.ID == id && e.IDNO.ToString()== numb);
            if (ent != null)
            {
                return Request.CreateResponse(HttpStatusCode.OK, ent);
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, "Applicant with ID " + id.ToString() + " not found in the system");
            }
        }
    }

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如果你让我，我想自己回答（我正在使用 .NET 5 + React）

控制器：

namespace MyProject.Controllers
{
    [Route("[controller]")]
    public class ExampleController : Controller
    {
        public string Get(string param1, string param2, string param3)
        {
            //your code here
        }
    }
}

JS（反应）：

fetch(`example?param1=${val1}&param2=${val2}&param3=${val3}`)

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