webmethod return values form base class

Question

{"__type":"CountryModel","dt":null,"ds":null,"dtRow":null,"strSQL":{"Capacity":16,"MaxCapacity":2147483647,"Length":0},"iCnt":0,"ConnType":"FP","Code":"AE","Value":"United Arab Emirates"},{"__type":"CountryModel","dt":null,"ds":null,"dtRow":null,"strSQL":{"Capacity":16,"MaxCapacity":2147483647,"Length":0},"iCnt":0,"ConnType":"FP","Code":"AF","Value":"Afghanistan"},{"__type":"CountryModel","dt":null,"ds":null,"dtRow":null,"strSQL":{"Capacity":16,"MaxCapacity":2147483647,"Length":0},"iCnt":0,"ConnType":"FP","Code":"AG","Value":"Antigua and Barbuda"},

this is the webmethod that I return by json, but the problem is, asp.net return value from base class that I inherit from, how to solve this? although is working, but the data are wasted as I don't wish to return the value, any idea?

BaseModel.cs

   public string ConnType="";
   public datatable dt;

CountryModel.cs:

public class CountryModel:BaseModel{
   public List<MenuFunctionModel> AssignList()
{
    var _List = new List<MenuFunctionModel>();

    foreach (DataRow dr in dt.Rows)
    {
        _List.Add(new MenuFunctionModel
        {
            Code = dr["Code"].ToString(),
            Title = dr["Title"].ToString(),
            Description = dr["Description"].ToString(),
            Location = dr["Location"].ToString() + dr["FileName"].ToString()
        });
    }
    return _List;
}
}

webservices api:

    [WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public static List<CountryModel> loadCt()
{
    CountryModel _Country = new CountryModel();
    _Country.SelectAll();
    return _Country.AssignList();
}

do you want to return only a part of data of MenuFunctionModel? — Sanjeev Rai
– Sanjeev Rai, Commented Jun 18, 2013 at 9:35
yes, I just wanna to return the part that inside the List, but it seen like it return everything, due to to List<MenuFunctionModel>? — Se0ng11
– Se0ng11, Commented Jun 18, 2013 at 9:37
This is due to the return type (List<CountryModel>) you have used in webmethod. you can use another class that contains only required number of fields, or use anynomous type — Sanjeev Rai
– Sanjeev Rai, Commented Jun 18, 2013 at 9:48
any example link that I can refer to? or I change every base class public variable to private, but this will had more change impact to other classes as I plan to use all the variable as global — Se0ng11
– Se0ng11, Commented Jun 18, 2013 at 9:49
Should be the class that inherit to the base model that cause the problem, any solution? — Se0ng11
– Se0ng11, Commented Jun 18, 2013 at 10:00

Community · Accepted Answer · 2017-05-23 11:56:02Z

1

You can return anynomous types from your WebMethod as:

[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public static Object loadCt()
{
    CountryModel _Country = new CountryModel();
    _Country.SelectAll();
    return _Country.AssignList().Select(m=> new{ Code=m.Code, Title =m.Title}); //select those fields only which you want to return
}

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edited May 23, 2017 at 11:56

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answered Jun 18, 2013 at 10:04

Sanjeev Rai

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1 Comment

Sanjeev Rai Over a year ago

always welcomed!. We all are thankful to this great community community for sure!

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