How can I pass in multiple parameters to Get methods in an MVC 6 controller. For example I want to be able to have something like the following.
[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)
{
}
}
So I can query like.
api/person?id=1
api/person?firstName=john&lastName=doe
api/person?firstName=john&lastName=doe&address=streetA
You also can use this:
// GET api/user/firstname/lastname/address
[HttpGet("{firstName}/{lastName}/{address}")]
public string GetQuery(string id, string firstName, string lastName,string address)
{
return $"{firstName}:{lastName}";
}
Why not using just one controller action?
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);
}
Another option is to use attribute routing, but then you'd need to have a different URL format:
//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)
{
}
To parse the search parameters from the URL, you need to annotate the controller method parameters with [FromQuery], for example:
[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)
{
}
}
I think the easiest way is to simply use AttributeRouting.
[Route("api/YOURCONTROLLER/{paramOne}/{paramTwo}")]
public string Get(int paramOne, int paramTwo)
{
return "The [Route] with multiple params worked";
}
NB-I removed FromURI .Still I can pass value from URL and get result.If anyone knows benfifts using fromuri let me know
To add some more detail about the overloading that you asked about in your comment after another answer, here is a summary. The comments in the ApiController show which action will be called with each GET query:
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 };
}
}
You would only need a single route for this, in case you wondered:
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
and you could test it all with this MVC view, or something simlar. Yes, I know you aren't supposed to mix JavaScript with markup and I'm not using bootstrap like you would normally, but this is for demo purposes only.
<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>
Using a url of style param1/param2/param3 fails in some cases when a url like param1/undefined/pram3 is generated by the front-end (Angular for example), so I used the classical approach:
[HttpGet("params/{prms}")]
public async Task<ActionResult<IEnumerable<SomeType>>> GetDataByParams(string prms)
{
string[] paramsArray = prms.Split("===");//Separate params in one string
string param1= paramsArray[0].Trim();
string param2= paramsArray[1].Trim();
string param3= paramsArray[2].Trim();
...
}
The resulting URL is for example : http://localhost:51975/api/YourController/params/PARAM1===PARAM2..
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");
}
}
}
来源：https://stackoverflow.com/questions/36280947/how-to-pass-multiple-parameters-to-a-get-method-in-asp-net-core