How to extract data from string in C#

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I getting data in my application through RFC. RFC returns data in several parameters/variables. One of the parameter return below string.

STRUCTURE ERRMSG{FIELD TYPE=E 
		FIELD ID = 
		FIELD NUMBER=000 
		FIELD MESSAGE=Invalid Referral Link 
		FIELD LOG_NO= FIELD 
		LOG_MSG_NO=000000 
		FIELD MESSAGE_V1= 
		FIELD MESSAGE_V2= 
		FIELD MESSAGE_V3= 
		FIELD MESSAGE_V4= 
		FIELD PARAMETER= FIELD 
		ROW=0 
		FIELD FIELD= 
		FIELD SYSTEM=
	}

From above string how can I extract value of FIELD MESSAGE field.

What I have tried:

So far I have tried this...

C#

Message = function.GetValue("MESSAGE").ToString();
from = Message.IndexOf("FIELD MESSAGE=");
to = Message.LastIndexOf("FIELD LOG_NO=");
Msg = Message.Substring(from, to - from).Replace("FIELD MESSAGE=", "").Trim();

It is working fine. But, is there another way to do this. Like using LINQ, LIST, Lambda Expression, XML etc...

Posted 12-Jul-16 2:53am

sopi9

Updated 17-Jul-16 21:51pm

Maciej Los

v3

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Comments

John C Rayan 12-Jul-16 9:10am

is the parameter FIELD LOG_NO always come after FIELD MESSAGE ?

sopi9 13-Jul-16 0:51am

Yes.

So far I have tried this...
Message = function.GetValue("MESSAGE").ToString();
from = Message.IndexOf("FIELD MESSAGE=");
to = Message.LastIndexOf("FIELD LOG_NO=");
Msg = Message.Substring(from, to - from).Replace("FIELD MESSAGE=", "").Trim();

It is working fine. But, is there another way to do this. Like using LINQ, LIST, Lambda Expression, XML etc...

4 solutions

Solution 1

C#

var match = Regex.Match(Message, @"FIELD MESSAGE=(.+?)FIELD LOG_NO").Groups[1].Value;

Posted 12-Jul-16 3:23am

John C Rayan

Updated 12-Jul-16 3:24am

v2

Solution 2

I'd try to parse such of data by using Linq:

C#

var data = msg.Replace("STRUCTURE ERRMSG", string.Empty)
            .Split(new string[]{"{", "}", "\n"}, StringSplitOptions.RemoveEmptyEntries)
            .Select(x=>new
                {
                    FieldName = x.Split('=')[0].Trim(),
                    FieldValue = x.Split('=').Count() == 1 ? string.Empty : x.Split('=')[1].Trim()
                })
            .ToList();

Above code returns:

FieldName     FieldValue
FIELD TYPE        E 
FIELD ID   
FIELD NUMBER      000 
FIELD MESSAGE     Invalid Referral Link 
FIELD LOG_NO      FIELD 
LOG_MSG_NO        000000 
FIELD MESSAGE_V1   
FIELD MESSAGE_V2   
FIELD MESSAGE_V3   
FIELD MESSAGE_V4   
FIELD PARAMETER   FIELD 
ROW               0 
FIELD FIELD   
FIELD SYSTEM

Note: i'd suggest to write custom class with Parse method to be able to deal with data.

Posted 12-Jul-16 23:39pm

Maciej Los

Solution 3

C#

string fieldValue= Regex.Match(message, @"(?<=FIELD MESSAGE=)(.*\n?)(?=FIELD LOG_NO=)").Groups[1].Value;

Posted 13-Jul-16 9:54am

NathanRO

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sopi9 · Accepted Answer · 2016-07-17T21:51:00

Solution 4

Thanks for all for time and consideration. I am using below code

Message = function.GetValue("MESSAGE").ToString();
from = Message.IndexOf("FIELD MESSAGE=");
to = Message.LastIndexOf("FIELD LOG_NO=");
Msg = Message.Substring(from, to - from).Replace("FIELD MESSAGE=", "").Trim();

Posted 17-Jul-16 21:51pm

sopi9