Filter with * which will restrain all values that starts with Null?

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I have the following code which extends my filter functionality to allow me to search for more than one Zip-code. Ex. (1254,125,145,1455)

C#

if (Post_Code_PAR != null)
{
    String[] PostCode_Array = Post_Code_PAR.Split(',');
    query = from p in query where PostCode_Array.Contains(p.Post_Code) select p;
}

I want to extend this code in a way that if I give it something like (0*) it will find zip codes which starts with 0. If I give it 123* it will give me all zip codes which starts with 123. Thanks a lot.

also tried this:

C#

String[] PostCode_Array = from p in Post_Code_PAR.Split(',') select String.Format("^{0}$", p.Replace("", @"\d"));
query = from p in query where PostCode_Array.Any(pattern => Regex.IsMatch(p.Post_Code, pattern)) select p;

But Iam getting this error:
Error 7 The type 'System.Collections.Generic.IEnumerable <string> "can not be implicitly converted to' string [] '. There is already an explicit conversion exists. (Maybe you missing a cast.)

Posted 15-Apr-15 3:33am

Member 11609637

Updated 15-Apr-15 4:07am

Dave Kreskowiak

v5

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Anil_Kumar_India 15-Apr-15 9:55am

Use Regular Expression, refer https://msdn.microsoft.com/en-us/library/hs600312(v=vs.110).aspx

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phil.o · Answer 1 · 2015-04-15T05:21:00

Solution 2

What about:

C#

String[] PostCode_Array = (from p in Post_Code_PAR.Split(',')
                          select String.Format("^{0}$", p.Replace("", @"\d")))
                          .ToArray();

?

Posted 15-Apr-15 5:21am

phil.o

Updated 15-Apr-15 5:49am

v2

Comments

Member 11609637 16-Apr-15 5:59am

Hi, Even when I change the Post_code_Array as you said I get a red line Reg.

Member 11609637 16-Apr-15 7:14am

I have this code but the results are not 100% Correct:
char[] delimiters = {'*'}; // never know what a user might try to use
if (Post_Code_PAR.Contains('*') & delimiters.Any(a => Post_Code_PAR.Contains(a)))
{
string[] codes = Post_Code_PAR.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
query = query.Where(a => codes.Any(b => a.Post_Code.StartsWith(b)));
}
else
{
//query = query.Where(a => a.Post_Code.StartsWith(Post_Code_PAR));
String[] PostCode_Array = Post_Code_PAR.Split(',');
query = from p in query where PostCode_Array.Contains(p.Post_Code) select p;
}