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I have a very simple Web API 4 controller over some legacy database code. The entity like like this:
public class Employee
{
public string EmploymentStatus { get; set; }
public string CompanyCode { get; set; }
public string Division { get; set; }
public string OrgLevel1Code { get; set; }
public string OrgLevel2Code { get; set; }
public string OrgLevel3 { get; set; }
public string StoreName { get; set; }
public string EmployeeNumber { get; set; }
public string EmployeeFirstName { get; set; }
public string EmployeeMiddleInitial { get; set; }
public string EmployeeLastName { get; set; }
public string EmailAddress { get; set; }
public string JobCode { get; set; }
public string DateInJob { get; set; }
public string OriginalHire { get; set; }
}
The method looks like this:
public HttpResponseMessage PostEmployee(Employee item)
{
DataHelpers.AddUser(item.CompanyCode, item.Division, item.OrgLevel1Code, item.OrgLevel2Code, item.OrgLevel3, item.EmployeeFirstName, item.EmployeeMiddleInitial, item.EmployeeLastName, item.EmailAddress, item.JobCode, item.OriginalHire);
var response = Request.CreateResponse<Employee>(HttpStatusCode.Created, item);
string uri = Url.Link("DefaultApi", new { id = item.EmployeeNumber });
response.Headers.Location = new Uri(uri);
return response;
}
When I POST through Fiddler like this:
POST /api/identity HTTP/1.1
User-Agent: Fiddler
Host: localhost:1421
Content-Length: 382
contentType: "application/json; charset=utf-8"
dataType: 'json'
{
"employmentStatus":"zzz",
"companyCode":"Titlemax",
"division":"bbb",
"orgLevel1Code":"ccc",
"orgLevel2Code":"ddd",
"orgLevel3":"eee",
"storeName":"fff",
"employeeNumber":"12343",
"employeeFirstName":"Bill",
"employeeMiddleInitial":"A",
"employeeLastName":"sempf",
"emailAddress":"[email protected]",
"jobCode":"GM",
"dateInJob":"8/7/2005",
"originalHire":"8/7/2005"
}
I get an exception from .NET and the item parameter is null.
{"Message":"An error has occurred.","ExceptionMessage":"Object reference not set to an instance of an object.","ExceptionType":"System.NullReferenceException"}
What am I missing? I'm new to the Web API. Thanks in advance.
296
Simply add parameterName = null in your route parameter. Another option is add an overload. Have 2 function names receive different parameters.
If you need to get multiple values from the request body, define a complex type. But still the value of email is NULL . The JavaScript code is part of generic method we use, so that's why the content-type is set to application/json; charset=utf-8 .
When Web API calls a method on a controller, it must set values for the parameters, a process called binding. By default, Web API uses the following rules to bind parameters: If the parameter is a "simple" type, Web API tries to get the value from the URI.
So, if you want to override the above default behaviour and force Web API to read a complex type from the URI, add the [FromUri] attribute to the parameter. To force Web API to read a simple type from the request body, add the [FromBody] attribute to the parameter.
I think it is the request format in Fiddler. Try removing the quotes from the Content-Type header
From the Composer tab:
POST http://localhost:1421/api/identity HTTP/1.1
Request Headers:
User-Agent: Fiddler
Host: localhost:1421
Content-Type: application/json; charset=utf-8
Request Body:
{
"employmentStatus":"zzz",
"companyCode":"Titlemax",
"division":"bbb",
"orgLevel1Code":"ccc",
"orgLevel2Code":"ddd",
"orgLevel3":"eee",
"storeName":"fff",
"employeeNumber":"12343",
"employeeFirstName":"Bill",
"employeeMiddleInitial":"A",
"employeeLastName":"sempf",
"emailAddress":"[email protected]",
"jobCode":"GM",
"dateInJob":"8/7/2005",
"originalHire":"8/7/2005"
}
Response:
HTTP/1.1 201 Created
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
Location: http://localhost:1421/api/identity/12343
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?YzpcdXNlcnNcY2FsdmlfMDAwXGRvY3VtZW50c1x2aXN1YWwgc3R1ZGlvIDIwMTJcUHJvamVjdHNcTXZjQXBwbGljYXRpb24yXE12Y0FwcGxpY2F0aW9uMlxhcGlcaWRlbnRpdHk=?=
X-Powered-By: ASP.NET
Date: Thu, 21 Feb 2013 03:53:04 GMT
Content-Length: 351
{"EmploymentStatus":"zzz","CompanyCode":"Titlemax","Division":"bbb","OrgLevel1Code":"ccc","OrgLevel2Code":"ddd","OrgLevel3":"eee","StoreName":"fff","EmployeeNumber":"12343","EmployeeFirstName":"Bill","EmployeeMiddleInitial":"A","EmployeeLastName":"sempf","EmailAddress":"[email protected]","JobCode":"GM","DateInJob":"8/7/2005","OriginalHire":"8/7/2005"}
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