Web Api Controller issue

mohammed Irshad

7y2k.NET

hello,

Error 1 Cannot implicitly convert type 'System.Collections.Generic.List

Model:

public class SickLeaveData

{

public string Pat_MR { get; set; }

public Boolean IsCitizen { get; set; }

public string MedicalRecordID { get; set; }

public string PatientID { get; set; }

}

API Controller:

public class SickLeaveController : ApiController

{

public HttpResponseMessage Get()

{

List sickleavegetdata = new List();

using (MedicalHL7Entities1 dc = new MedicalHL7Entities1())

{

sickleavegetdata = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_MR).ToList();

HttpResponseMessage response;

response = Request.CreateResponse(HttpStatusCode.OK, sickleavegetdata);

return response;

}

Error:sickleavegetdata = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_MR).ToList();

8 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sreekanth Reddy7y ago
Accepted answer
Hi Mohammed,
It should be like below:
List sickleavegetdata = new List;
In the place of type give you class name(I feel it was 'B_HIS_Demog_Pat_Mstr').
List sickobjlst = new List();
Mark as answer, If it helps.
Thank you.
Jignesh Kumar7y ago
Hi Mohammed,

You are assigning your list to another type of List. You are trying to assign list type of B_HIS_DemogPPat_Mstr to list of sickleaveData. Both are different list. Please do mapping for fields which you want as result.
mohammed Irshad7y ago
list already created
public partial class SickLeaveData
{
public string Pat_MR { get; set; }
public Boolean IsCitizen { get; set; }
public string MedicalRecordID { get; set; }
public string PatientID { get; set; }
public string Pat_Frst_NM { get; set; }
}
error:
Jignesh Kumar7y ago
Hi Mohammed,

Please try to create List,
public HttpResponseMessage Get()

{

List<SickLeaveData> sickleavegetdata = new List();

using (MedicalHL7Entities1 dc = new MedicalHL7Entities1())

{

sickleavegetdata = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_MR).ToList();

HttpResponseMessage response;

response = Request.CreateResponse(HttpStatusCode.OK, sickleavegetdata);

return response;

}

}
Ehsan Sajjad7y ago
Use the implicit variable var and then inspect what kind of List it is fetching using the breakpoint and quick watch following way:
var result = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_MR).ToList();
mohammed Irshad7y ago
@Sreekanth I'm following the below url
https://www.c-sharpcorner.com/article/web-api-using-asp-net-mvc-and-entity-framework-part-1/

After changing the code as below

public HttpResponseMessage Get()
{
List sickobjlst = new List();
using (MedicalHL7Entities dc = new MedicalHL7Entities())
{
sickobjlst = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_Nat).ToList();
HttpResponseMessage response;
response = Request.CreateResponse(HttpStatusCode.OK, sickobjlst);
return response;
}
}

I'm getting the error no data .
Thanks
mohammed Irshad7y ago

@Sreekanth Reddy

I'm getting this error

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'.
Sreekanth Reddy7y ago
Hi Mohammed,

List sickleavegetdata = new List();
sickleavegetdata = dc.B_HIS_Demog_Pat_Mstr.OrderBy(a => a.Pat_MR).ToList();
Your linq query is not returning the "List".
Instead it might be returning some other data type.
Please check the type.
Did you get any compile time error ?
Thank you.