linq query for update more than one record

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hi,
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.I want to update multiple records based on workfor_id.
can u tell me how to implement this.

Posted 10-Oct-12 20:32pm

charan1431

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Tejas Vaishnav 11-Oct-12 2:57am

what you tried so far...

charan1431 11-Oct-12 3:05am

foreach (var k in us){
var indList = dbContext.industries.Where(i => i.workfor_id == k.id).Select(i => i).ToArray();
string ind2 = k.industry;
var industryParts = ind2.Split(',');
var o = (industryParts.Length);
for (c = 0; c < o; c++){
industries ind = new industries();
ind.workfor_id = Convert.ToInt16(k.id);
ind.workfor_industry_id = Convert.ToInt16(k.industryid);
} }
with this i am getting multiple records depending upon workfor_id.

Greysontyrus 11-Oct-12 4:21am

It looks like you're taking a csv list in 'industryParts' and are creating new 'industries' instances for each item in the csv. First, without anything else within that 'for' loop, you are losing every instance of 'ind' apart from the last. Second, each instance 'ind' is identical.
Q: where are you expecting this update to take place? Is this the whole code?

charan1431 11-Oct-12 4:34am

actually with the above code,new record is adding with out updating the existing record.so I removed code for creating new instance.
I want to update the records in indList with different workfor_industry_id values.

Greysontyrus 12-Oct-12 5:42am

Please use the reply button on the comment. That way the conversation is easy to track and I get a note letting me know that you've replied ^_^
To update a record you have to change the record you got back from the data context, not a new instance. I think what you need is:
foreach(industries ind in indList){
ind.workfor_id = Convert.ToInt16(k.id);
ind.workfor_industry_id = Convert.ToInt16(k.industryid);
}
dbContext.SubmitChanges();

or am I getting the wrong end of the stick?

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