?
Solved

Need help with WHERE clause in LINQ trying to use a wildcard

Posted on 2011-02-28
6
Medium Priority
?
775 Views
Last Modified: 2013-11-11
I am asking the user to key in a code to lookup.  I want them to be able to key in just part of the code and my result come back with the closest match to their partial entry in the field.  Example.

Actual Code: 234.32

They key in:
23   -  it would return in the list
234 - it would return in the list
234. it would return in the list.

Can someone show me where I am goin wrong?


var ICD9Result = from ICD9data in dc1234.ICD9s
                                 where ICD9data.ICD9_cd.ToString().StartsWith("@"+tbDiagCodeLookup.ToString())
                                 select new { ICD9data.ICD9_cd, ICD9data.Name };

Open in new window

0
Comment
Question by:kwh3856
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 12

Expert Comment

by:HugoHiasl
ID: 35004544
What for is the @ character?  This one is normally used if you use predefined varaibles what you do not do here.
0
 

Author Comment

by:kwh3856
ID: 35007857
I thought that was the wildcard symbol.  If not...what is a wildcard symbol in LINQ?
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 35007966
Hi Kenny;

The error is that you have prepend a @ to the search string. So what you are sending to the server is @23, @234 and @234.So remove the @ sign. So try it like this:

var ICD9Result = from ICD9data in dc1234.ICD9s
                     where ICD9data.ICD9_cd.ToString().StartsWith(tbDiagCodeLookup.ToString())
                     select new { ICD9data.ICD9_cd, ICD9data.Name };

Open in new window


There is a better way which gives more flexibility and that is to use the T-SQL Like command in the query as follows:

using System.Data.Linq.SqlClient;                 
                 
string pattern = "23%";

var ICD9Result = from ICD9data in dc1234.ICD9s
                 where SqlMethods.Like(ICD9data.ICD9_cd.ToString(), pattern)
                 select new { ICD9data.ICD9_cd, ICD9data.Name };                 

Open in new window



The pattern can be any T-SQL Like meta-characters.

Fernando
0
Veeam Task Manager for Hyper-V

Task Manager for Hyper-V provides critical information that allows you to monitor Hyper-V performance by displaying real-time views of CPU and memory at the individual VM-level, so you can quickly identify which VMs are using host resources.

 
LVL 63

Expert Comment

by:Fernando Soto
ID: 35008262
Hi Kenny;

To your question, "I thought that was the wildcard symbol.  If not...what is a wildcard symbol in LINQ?", When you use the Startswith the function takes your string and adds a % to the end of the string. Using the SqlMethods.Like you place the meta-characters where you like  using the T-SQL Like pattern characters found here.

Fernando
0
 

Author Closing Comment

by:kwh3856
ID: 35009884
Fernando
Thank you very much. I appreciate it when you answer my questions because I am always learning something new. Thanks
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 35009951
Not a problem Kenny, always glad to help.  ;=)
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question