C# Format String

Question

C# can format a string e.g. $"string {a} {b} {c}" to substitute the variables a, b and c into the string.

    var a = "string1";
    var b = "string2";
    var c = "string3";
    var d = $"string {a} {b} {c}";    // become "string string1 string2 string3"

Is is possible to store the format string to a variable so that I can create the string template dynamically.

    var a = "string1";
    var b = "string2";
    var c = "string3";
    var template = "string {a} {b} {c}";

    var d = $template;  // Can I do this?

Thank you!

You'll have to use string.Replace e.g. template.Replace("{a}", a).Replace("{b}", b).Replace("{c}", c) — tmaj
– tmaj, Commented Apr 30, 2020 at 3:34
Does this answer your question? String Interpolation with format variable This answer might be helpful as well — Pavel Anikhouski
– Pavel Anikhouski, Commented Apr 30, 2020 at 7:39

Alexander Petrov · Accepted Answer · 2020-04-30 03:36:21Z

2

You should use string.Format:

var a = "string1";
var b = "string2";
var c = "string3";

var template = "string {0} {1} {2}";

var d = string.Format(template, a, b, c);

answered Apr 30, 2020 at 3:36

Alexander Petrov

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Comments

gMoney · Accepted Answer · 2020-04-30 03:38:27Z

2

yes very possible you are taking one string and formatting it to fill in variables just like with any language.

In C# it can be done like this

var a = "string1"; // first string
var b = "string2"; // second string
var c = "string3"; // third string
var d = "string {0} {1} {2}"; // string to format (fill with variables)

// formatting the string 
var template = string.Format(d, a, b, c);

// output -> "string string1 string2 string3"

answered Apr 30, 2020 at 3:38

gMoney

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Comments

Hadi Samadzad · Accepted Answer · 2020-04-30 03:36:38Z

1

You can implement this by using String.Format.

var a = "string1";
var b = "string2";
var c = "string3";
var template = "string {0} {1} {2}";

var d = String.Format(template, a,b,c);

answered Apr 30, 2020 at 3:36

Hadi Samadzad

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Comments

tmaj · Accepted Answer · 2020-04-30 03:48:39Z

1

I think a good candidate is string.Format, but you could also use the fancy FormattableStringFactory.

var a = "string1";
var b = "string2";
var c = "string3";
var template = "string {0} {1} {2}"; //Please note, not {a}, but {0}

var str = string.Format(template, a, b, c); // Preferred

// From System.Runtime.CompilerServices
var str2 = FormattableStringFactory.Create(template, new object[] { a, b, c });

If you want to keep '{a}' (not '{0}') then string.Replace is here to help.

var d = template
       .Replace('{a}', a);
       .Replace('{b}', b);
       .Replace('{c}', c);

answered Apr 30, 2020 at 3:48

tmaj

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