Two issues with KeywordQuery in Client with Managed CSOM

Question

Hi All,
I’m new in SharePoint development and facing an issue for a week w/o any resolution. After extensive search, posting here with hope that some kind person will suggest what to do.
Background: we are developing a client desktop tool for sharepoint online site search. So we are using CSOM and KeywordQuery.
Issues:
keywordQuery.QueryText, can not search by custom column of document library. Suppose we have added two custom columns- “CaseNo” and “PurchaseAmount” in a document library called “DocLib1”. When using keywordQuery.QueryText = "caseno:123"; -
it does not return anything
The CaseNo, PurchaseAmount fields are not returned in search result when search by keywordQuery.QueryText = "123";
So tried to add the property “keywordQuery.SelectProperties.Add("CaseNo ");” – it returns less number of column (32), but don’t return the CaseNo.
Giving code below:
using (ClientContext clientContext = new ClientContext("https://zzz"))
                SecureString passWord = new SecureString();
                string pass = "zzzz";
                foreach (char c in pass.ToCharArray())
                    passWord.AppendChar(c);
                clientContext.Credentials = new SharePointOnlineCredentials("zzz.hotmail.com", passWord);
                KeywordQuery keywordQuery = new KeywordQuery(clientContext);
                 keywordQuery.RowLimit = 500;
                 keywordQuery.TrimDuplicates = true;
                 keywordQuery.SortList.Add("LastModifiedTime", Microsoft.SharePoint.Client.Search.Query.SortDirection.Descending);
                StringCollection selectProperties = keywordQuery.SelectProperties;
                keywordQuery.SelectProperties.Add("caseno");
                 keywordQuery.QueryText = "caseno:123"; 
                SearchExecutor searchExecutor = new SearchExecutor(clientContext);
                ClientResult<ResultTableCollection> results = searchExecutor.ExecuteQuery(keywordQuery);
                clientContext.ExecuteQuery();
                foreach (var resultRow in results.Value[0].ResultRows)
                    Console.WriteLine("{0}: {1} ({2})", resultRow["Title"], resultRow["Path"], resultRow["Write"]);
                Console.WriteLine("END");
                Console.ReadLine();
Look forward your kind response with the answer
Regards,

Answer 1

Hi,
For any properties to be added in the KQL query, you need to have managed properties.  In your scenario, you are creating two custom columns in the document library.  These two columns will create the crawled properties, not managed properties.
In order to include in search, you have create the managed property and map to the crawl property.  How to create managed property and map to crawl property, please refer to the following article.
Creating Custom Managed Properties
Once you create the custom managed property, you can include either in KQL or search directly in the search box.
Please mark it answered, if your problem resolved.