Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 789
  • Last Modified:

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

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
kwh3856
Asked:
kwh3856
  • 3
  • 2
1 Solution
 
HugoHiaslCommented:
What for is the @ character?  This one is normally used if you use predefined varaibles what you do not do here.
0
 
kwh3856Author Commented:
I thought that was the wildcard symbol.  If not...what is a wildcard symbol in LINQ?
0
 
Fernando SotoRetiredCommented:
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
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
Fernando SotoRetiredCommented:
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
 
kwh3856Author Commented:
Fernando
Thank you very much. I appreciate it when you answer my questions because I am always learning something new. Thanks
0
 
Fernando SotoRetiredCommented:
Not a problem Kenny, always glad to help.  ;=)
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now