Question

I have a table named industries. In this my fields are

• workfor_id,
• workfor_usr_id,
• workfor_industry_id.

With the same values of workfor_id, I have different workfor_industry_id‘s.

foreach (var k in us){ 
    var ind = dbContext.industries.Where(i => i.workfor_id == 
        k.id).Select(i => i).FirstOrDefault(); 
    string ind2 = k.industry; 
    var industryParts =   ind2.Split(','); 
    var o = (industryParts.Length); 
    for (c = 0; c < o; c++){  
    ind.workfor_id = Convert.ToInt16(k.id); 
    ind.workfor_industry_id = Convert.ToInt16(k.industryid); }
     }

To update workfor_industry_id field I have implemented inner loop inside the foreach loop to get the values of workfor_industry_id’s.here same record is over loading with different workfor_industry_id’s.

can you tell me how to implement this.

Answer 1

UPDATED
This update adds a little more error checking and assumes that -1 is never a valid value for industry_id

short GetShort(string value) {
  short returnValue;
  value = (value ?? string.Empty).Replace("\"",null);
  return short.TryParse(value, out returnValue) ? returnValue : (short)-1;
}

foreach (var k in us){ 
  var id=Convert.ToInt16(k.id);
  var toRemove=from i in dbContext.industries
               where i.workfor_id == k.id
               select i;
  var toAdd = from x in (k.industry ?? string.Empty).Split(',')
              select new Industry { 
                      workfor_id=id,
                      workfor_industry_id=GetShort(x)
                    };

  dbContext.industries.DeleteAllOnSubmit(toRemove); 
  dbContext.industries.InsertAllOnSubmit(toAdd.Where(x=>x.workfor_industry_id != -1));

}
dbContext.SubmitChanges();