如何在MVC 6控制器中将多个参数传递给Get方法。例如，我希望能够拥有类似以下内容的东西。
[Route("api/[controller]")]
public class PersonController : Controller
{
public string Get(int id)
{
}
public string Get(string firstName, string lastName)
{
}
public string Get(string firstName, string lastName, string address)
{
}
}所以我可以查询喜欢。
api/person?id=1
api/person?firstName=john&lastName=doe
api/person?firstName=john&lastName=doe&address=streetAAnswers:
您还可以使用以下命令：
// 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：请参考metalheart的和metalheart，Mark Hughes以获得更好的方法。
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);
}另一个选择是使用属性路由，但是随后您需要使用其他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)
{
}要从URL解析搜索参数，您需要使用注释控制器方法参数[FromQuery]，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)
{
}
}[HttpGet]批注，不同的方法名称和特定的路由[Route]-路由现在应该是完全显式的，从而消除了一些可能的问题。
我认为最简单的方法就是简单地使用AttributeRouting。
[Route("api/YOURCONTROLLER/{paramOne}/{paramTwo}")]
public string Get(int paramOne, int paramTwo)
{
return "The [Route] with multiple params worked";
}int paramOne, string paramTwo
我建议使用一个单独的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。
这样可以更轻松地传递参数，并使代码更清晰。
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://localhost:44338/test/testaction/3/2010-09-30/2012-05-01要添加更多有关您在另一个答案之后的评论中要求的超载的详细信息，以下是摘要。ApiController显示每个GET查询将调用哪个操作的注释：
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，您只需要一条路线即可：
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);您可以使用此MVC视图或类似的东西对其进行测试。是的，我知道您不应该将JavaScript与标记混合使用，并且我不会像通常那样使用引导程序，但这只是出于演示目的。
<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>
NB-我删除了FromURI。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
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，并且控制器名称以plurar表示（Persons不是Person）。
因此，如果您想通过id获取资源，它将为：
api/persons/1如果您想通过某些搜索条件（例如名字等）来获取物体，则可以执行以下搜索：
api/persons?firstName=Name&...并继续前进，例如，如果您想接受该人的命令，应该是这样的：
api/persons/1/orders?skip=0&take=20和方法在同一个控制器中：
[HttpGet("{personId}/orders")]
public Orders[] Get(int personId, int skip, int take, etc..) 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");
}
}
}