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POLINQ to SQL INSERT WHERE not in collection
 

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  1. POLINQ to SQL INSERT WHERE not in collection
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    <p>I need to mirror all of the DNS entries on our DNS server in a SQL database. I am able to query DNS using WMI and C#. And I can query SQL for existing records using L2S but there is a lot of room for improvement.</p> <p>What does the LINQ To SQL statement look like that will insert records that are not in the ManagementObjectCollection returned by WMI into the SQL table?</p> <p>What I have so far works but seems inefficient.</p> <pre><code>internal static void SyncRecordInfo() { int affected = 0; DnsEntityDataContext db = new DnsEntityDataContext(); //Select records in DNS string[] Types = { "A", "CName", "MX" }; for (int i = 0; i &lt; Types.Length; i++) { string Query = "SELECT * FROM MicrosoftDNS_" + Types[i] + "Type"; ObjectQuery qry = new ObjectQuery(Query); DnsProvider dns = new DnsProvider(); ManagementObjectSearcher s = new ManagementObjectSearcher(dns.Session, qry); ManagementObjectCollection col = s.Get(); dns.Dispose(); foreach (var item in col) { //(from m in ManagementObjectCollection select m.SomeID).Contains(&lt;main source field&gt;) int count = (from r in db.Records where ((r.Data.Contains(item["RecordData"].ToString())) &amp;&amp; (r.Name.Contains(item["OwnerName"].ToString()))) select r).Count(); if (count &lt; 1) { //Insert records in SQL Record record = new Record(); record.Data = item["RecordData"].ToString(); record.Name = item["OwnerName"].ToString(); //record.Notes = item["ContainerName"].ToString(); record.Type = Types[i]; db.Records.InsertOnSubmit(record); db.SubmitChanges(); affected++; } } } } </code></pre>
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