WebAPI 2參數綁定方法，webapi2參數綁定

WebAPI 2參數綁定方法，webapi2參數綁定

簡單類型參數

Example 1: Sending a simple parameter in the Url

[RoutePrefix("api/values")]
public class ValuesController : ApiController
{
  // http://localhost:49407/api/values/example1?id=2
  [Route("example1")]
  [HttpGet]
  public string Get(int id)
  {
     return "value";
  }
}

Example 2: Sending simple parameters in the Url

// http://localhost:49407/api/values/example2?id1=1&id2=2&id3=3
[Route("example2")]
[HttpGet]
public string GetWith3Parameters(int id1, long id2, double id3)
{
    return "value";
}

Example 3: Sending simple parameters using attribute routing

// http://localhost:49407/api/values/example3/2/3/4
[Route("example3/{id1}/{id2}/{id3}")]
[HttpGet]
public string GetWith3ParametersAttributeRouting(int id1, long id2, double id3)
{
   return "value";
}

Example 4: Sending an object in the Url

// http://localhost:49407/api/values/example4?id1=1&id2=2&id3=3
[Route("example4")]
[HttpGet]
public string GetWithUri([FromUri] ParamsObject paramsObject)
{
  return "value:" + paramsObject.Id1;
}

Example 5: Sending an object in the Request body

[Route("example5")]
[HttpPost]
public string GetWithBody([FromBody] ParamsObject paramsObject)
{
  return "value:" + paramsObject.Id1;
}

注意 [FromBody] 只能用一次，多於一次將不能正常工作

Calling the method using Urlencoded in the body:

User-Agent: Fiddler
Host: localhost:49407
Content-Length: 32
Content-Type: application/x-www-form-urlencoded

id1=1&id2=2&id3=3

User-Agent: Fiddler Host: localhost:49407 Content-Length: 32 Content-Type: application/json { "Id1" : 2, "Id2": 2, "Id3": 3} protected void Application_Start() { var xml = GlobalConfiguration.Configuration.Formatters.XmlFormatter; xml.UseXmlSerializer = true; The client request is as follows: User-Agent: Fiddler Content-Type: application/xml Host: localhost:49407 Content-Length: 65 <ParamsObject><Id1>7</Id1><Id2>8</Id2><Id3>9</Id3></ParamsObject>

// http://localhost:49407/api/values/example6?paramsObject=2,paramsObject=4,paramsObject=9 [Route("example6")] [HttpGet] public string GetListFromUri([FromUri] List<int> paramsObject) { if (paramsObject != null) { return "recieved a list with length:" + paramsObject.Count; } return "NOTHING RECIEVED..."; }

Example 7: Sending an object list in the Body

// http://localhost:49407/api/values/example8
[Route("example8")]
[HttpPost]
public string GetListFromBody([FromBody] List<ParamsObject> paramsList)
{
  if (paramsList != null)
  {
     return "recieved a list with length:" + paramsList.Count;
  }

  return "NOTHING RECIEVED...";
}

Calling with Json:

User-Agent: Fiddler
Content-Type: application/json
Host: localhost:49407
Content-Length: 91

[{"Id1":3,"Id2":76,"Id3":19},{"Id1":56,"Id2":87,"Id3":94},{"Id1":976,"Id2":345,"Id3":7554}]

User-Agent: Fiddler Content-Type: application/xml Host: localhost:49407 Content-Length: 258 <ArrayOfParamsObject> <ParamsObject><Id1>3</Id1><Id2>76</Id2><Id3>19</Id3></ParamsObject> <ParamsObject><Id1>56</Id1><Id2>87</Id2><Id3>94</Id3></ParamsObject> <ParamsObject><Id1>976</Id1><Id2>345</Id2><Id3>7554</Id3></ParamsObject> </ArrayOfParamsObject>

[Route("example8")] [HttpPost] public string GetListsFromBody([FromBody] List<List<ParamsObject>> paramsList) { if (paramsList != null) { return "recieved a list with length:" + paramsList.Count; } return "NOTHING RECIEVED..."; }

  
This is a little bit different to the previous examples. The body can only send one single object to Web API. Because of this, the lists of objects are wrapped in a list or a parent object.

POST http://localhost:49407/api/values/example8 HTTP/1.1
User-Agent: Fiddler
Content-Type: application/json
Host: localhost:49407
Content-Length: 185

[
 [
  {"Id1":3,"Id2":76,"Id3":19},
  {"Id1":56,"Id2":87,"Id3":94},
  {"Id1":976,"Id2":345,"Id3":7554}
 ],
 [
  {"Id1":3,"Id2":76,"Id3":19},
  {"Id1":56,"Id2":87,"Id3":94},
  {"Id1":976,"Id2":345,"Id3":7554}
 ]
]

自定義參數

What if the default parameter binding is not enough? Then you can use the ModelBinder class to change your parameters and create your own parameter formats. You could also use ActionFilters for this. Many blogs exist which already explains how to use the ModelBinder class. See the links underneath.

文件和二進制

Files or binaries can also be sent to Web API methods. The article demonstrates how to do this.

參考

http://aspnet.codeplex.com/SourceControl/latest#Samples/WebApi/CustomParameterBinding/

http://www.asp.net/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api

http://www.strathweb.com/2013/04/asp-net-web-api-parameter-binding-part-1-understanding-binding-from-uri/

http://www.roelvanlisdonk.nl/?p=3505

http://stackoverflow.com/questions/9981330/how-to-pass-an-array-of-integers-to-a-asp-net-web-api-rest-service

http://stackoverflow.com/questions/14628576/passing-an-json-array-to-mvc-web-api-via-get