How to use string.format with array of arguments names as argument?

Question

I want to create string from variables based on format of another string. It passes only string names, not references. Ref is not working. What can i do?

var format = "city, post_code, street, building_number,name"
var city = model["City"];
var post_code = model["Post_Code"];
var street = model["Street"];
var building_number = model["Building_Number"];
var name = model["Name"];
var arguments = format.Split(",");
var s = String.Format("{0} {1} {2} {3} {4}", new object[] {  arguments[0],  arguments[1], arguments[2], arguments[3], arguments[4] });

can you also include what are your expected value?

currarpickt
– currarpickt

2019-06-19 07:59:59 +00:00
Commented Jun 19, 2019 at 7:59 — currarpickt
– currarpickt, Commented Jun 19, 2019 at 7:59

CodeCaster · Accepted Answer · 2019-06-19 08:00:09Z

3

You're trying to use strings as variable names. C# is not PHP.

What you actually want is string interpolation:

var s = $"{city}, {post_code}, {street}, {building_number}, {name}";

Now if you want this format string to be variable, see:

answered Jun 19, 2019 at 8:00

CodeCaster

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3 Comments

Spiker Over a year ago

I know, but i need to format this "s" string as in format. Something like this? I have to order it like in format string. var s = $"format";

CodeCaster Over a year ago

Yeah so see the linked questions.

Spiker Over a year ago

I fell so stupid right now. var format = "{var1},{var2}"; var finalString = $"{format}";

Christoph Biegner · Accepted Answer · 2019-06-19 08:23:15Z

0

Not sure about the expected result/functionality here.

Is format a static Information or can it vary? I interpreted the question as the later is inteded. A (quite basic) solution could be:

    public void foo(DataRow model, String format = "city,post_code,street,building_number,name")
    {
        var arguments = format.Split(',');

        var val1 = model[arguments[0]];
        var val2 = model[arguments[1]];
        var val3 = model[arguments[2]];
        var val4 = model[arguments[3]];
        var val5 = model[arguments[4]];

        var s = $"{val1} {val2} {val3} {val4} {val5}";
    }

answered Jun 19, 2019 at 8:23

Christoph Biegner

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1 Comment

Spiker Over a year ago

Thank you for answer, I cant give you upvote but it works quite good :)

Unknown · Accepted Answer · 2019-06-19 08:02:42Z

-1

You are not using the String.Format correctly. Modify your code like this

var s = String.Format("{0} {1} {2} {3} {4}", arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);

answered Jun 19, 2019 at 8:02

Unknown

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1 Comment

CodeCaster Over a year ago

No. arguments[0] is "city", but the OP wants the value of the variable named city to be printed there. Also, both you and the OP are using the String.Format(string, params object[] args) overload, both syntaxes call the same method. See also ideone.com/mmf3PQ.

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