How to insert into string as many times I want then call it?

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Hi, first my question above my sound stupid anyways i create a simple app that can produce a text file. What i'm doing is that i'm inserting a bunch of words in a single string by using concatenation then call in in

File.Write(File);

.

my problem is how can i repeat the process of inserting the words in a string again and again then call it to File.Write();, because i don't want to produce a thousand text file. here is my code.

string space = "\r\n";
    string UNB = "UNB+UNOA:2+MNL03+WANHAI+20200413:0000+11011" + "'" + space;
    string UNH = "UNH+11011+CODECO:D:95B:UN:ITG13" + "'" + space;
    string BGM = "BGM+34+20200413+9" + "'" + space;
    string NAD = "NAD+CF+WHL:160:166" + "'" + space;
    string EQD = "EQD+CN+WHLU0327099+22GI:102:5+++4" + "'" + space;
    string DTM = "DTM+" + dtmDO.dtQualifier + ":" + dtmDO.dtPeriod + ":" + dtmDO.dtPeriodFormatQualifier + "'" + space;
    string LOC = "LOC+11+PHBTG:139:6" + "'" + space;
    string CNT = "CNT+16:1" + "'" + space;
    string UNT = "UNT+10+11011" + "'" + space;
    string UNZ = "UNZ+4+11011" + "'" + space;

    string final = UNB + UNH + BGM + NAD + EQD + DTM + LOC + CNT + UNT + UNZ;
    StreamWriter File = new StreamWriter("Reden.edi");
    File.Write(File);
    File.Close();

What I have tried:

i tried Insert method in string but no it's not what i want but i this i'll try the add method but i don't any next step.

Hi, here is my solution on using the

File.AppendAllText

method

DTM dtmDO = new DTM();
            string space = "\r\n";
            int r = 100;
            StreamWriter Files = new StreamWriter("Reden.edi");
            Files.Close();
            string UNB = "UNB+UNOA:2+MNL03+WANHAI+20200413:0000+11011" + "'" + space;
            string UNH = "UNH+11011+CODECO:D:95B:UN:ITG13" + "'" + space;
            string BGM = "BGM+34+20200413+9" + "'" + space;
            string start = UNB + UNH + BGM;
            File.AppendAllText("Reden.edi", start);
            for (int i = 0; i < r; i++)
            {         
                string NAD = "NAD+CF+WHL:160:166" + "'" + space;
                string EQD = "EQD+CN+WHLU0327099+22GI:102:5+++4" + "'" + space;
                string DTM = "DTM+" + dtmDO.dtQualifier + ":" + dtmDO.dtPeriod + ":" + dtmDO.dtPeriodFormatQualifier + "'" + space;
                string LOC = "LOC+11+PHBTG:139:6" + "'" + space;
                string final = NAD + EQD + DTM + LOC;
                File.AppendAllText("Reden.edi", final);
            }     
            string CNT = "CNT+16:100" + "'" + space;
            string UNT = "UNT+10+11011" + "'" + space;
            string UNZ = "UNZ+4+11011" + "'" + space;
            string end = CNT + UNT + UNZ;
            File.AppendAllText("Reden.edi", end);         
            Files.Close();

And it works thanks to all. :)

Posted 2-Jul-20 4:15am

Reden Rodriguez

Updated 2-Jul-20 19:37pm

v3

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CPallini · Accepted Answer · 2020-07-02T04:21:00

Solution 1

If I got you then you may find the StringBuilder Class (System.Text) | Microsoft Docs[^] interesting.

Posted 2-Jul-20 4:21am

CPallini

Comments

Maciej Los 7-Jul-20 5:33am

5ed!

CPallini 7-Jul-20 13:37pm

Thank you again and again (and again) :-)

OriginalGriff · Accepted Answer · 2020-07-02T04:39:00

Two things:
1) The code you show writes an unknown string to the file: you assemble a string in final but write the content of sb:

C#

string final = UNB + UNH + BGM + NAD + EQD + DTM + LOC + CNT + UNT + UNZ;
...
File.Write(sb);

2) There are several ways to do what you want. One - as suggested by CPallini - is to use a StringBuilder, which is always a better idea than string concatenation. StringBuilder is an "expandable string" which means it uses less memory that multiple concatenations (remember that strings are immutable, so each time you add two strings, you produce a third.
This code:

C#

string final = UNB + UNH + BGM + NAD + EQD + DTM + LOC + CNT + UNT + UNZ;

generates a number of intermediate strings, each increasing in length as it goes.

A better solution might be to just use the File.AppendAllText Method (System.IO) | Microsoft Docs[^] to add each term when you need:

C#

string final = UNB + UNH + BGM + NAD + EQD + DTM + LOC + CNT + UNT + UNZ;
...
File.AppendAllText("Reden.edi", final);