Reputation: 25928

How do I interpolate strings?

I want to do the following in C# (coming from a Python background):

strVar = "stack"
mystr  = "This is %soverflow" % (strVar)

How do I replace the token inside the string with the value outside of it?

Upvotes: 117

Answers (16)

Sylvain Rodrigue

Reputation: 4963

You can use string interpolation. C# 6.0

string mystr = $"This is {strVar}overflow";

Upvotes: 11

Vivek Nuna

Reputation: 1

You can now create an interpolated string not only with the $ sign, but also with €.

string name = "Michael";

string a = €"Hello, {name}!";
string b = $"Hello, {name}!";

Console.WriteLine(a == b); \/\/ True

The .NET XI version (.NET 11) also promises to introduce support for the £ symbol.

Reference: https://medium.com/@alexeynovikov_89393/all-new-c-13-features-whats-new-in-net-10-and-why-there-is-no-net-9-5ae756f84dc9

Upvotes: 0

Ygalbel

Reputation: 5519

You can use the dollar sign and curl brackets.

Console.WriteLine($"Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.");

See doc here.

Upvotes: -1

Vikas Lalwani

Reputation: 1061

Basic example:

        var name = "Vikas";
        Console.WriteLine($"My name is {name}");

Adding Special characters:

string name = "John";
Console.WriteLine($"Hello, \"are you {name}?\", but not the terminator movie one :-{{");
//output-Hello, "are you John?", but not the terminator movie one :-{

Not just replacing token with value, You can do a lot more with string interpolation in C#

Evaluating Expression

Console.WriteLine($"The greater one is: { Math.Max(10, 20) }");
//output - The greater one is: 20

Method call

    static void Main(string[] args)
    {
        Console.WriteLine($"The 5*5  is {MultipleByItSelf(5)}");
    }
  
    static int MultipleByItSelf(int num)
    {           
        return num * num;
    }

Source: String Interpolation in C# with examples

Upvotes: -1

SUNIL DHAPPADHULE

Reputation: 2863

You can use the following way

String interpolation

The $ special character identifies a string literal as an interpolated string. e.g.

string name = "Mark";
string surname = "D'souza";
WriteLine($"Name :{name} Surname :{surname}" );//Name :Mark Surname :D'souza

An interpolated string is a string literal that might contain interpolated expressions. When an interpolated string is resolved to a result string, items with interpolated expressions are replaced by the string representations of the expression results.

String.Format

Use String.Format if you need to insert the value of an object, variable, or expression into another string.E.g.

WriteLine(String.Format("Name: {0}, Surname : {1}", name, surname));

Upvotes: 0

Sakal

Reputation: 145

If you currently use Visual Studio 2015 with C# 6.0, try the following:

var strVar = "stack";

string str = $"This is {strVar} OverFlow";

that feature is called string interpolation.

Upvotes: 12

Talha Imam

Reputation: 1106

There's one more way to implement placeholders with string.Replace, oddly helps in certain situations:

mystr = mystr.Replace("%soverflow", strVar);

Upvotes: 0

Matthew Abbott

Reputation: 61589

Use string.Format:

string mystr = string.Format("This is {0}overflow", "stack");

Upvotes: 5

Darin Dimitrov

Reputation: 1038720

string mystr = string.Format("This is {0}overflow", strVar);

And you could also use named parameters instead of indexes.

Upvotes: 85

Ashtonian

Reputation: 4423

This has been added as of C# 6.0 (Visual Studio 2015+).

Example:

var planetName = "Bob";
var myName = "Ford"; 
var formattedStr = $"Hello planet {planetName}, my name is {myName}!";
// formattedStr should be "Hello planet Bob, my name is Ford!"

This is syntactic sugar for:

var formattedStr = String.Format("Hello planet {0}, my name is {1}!", planetName, myName);

Additional Resources:

String Interpolation for C# (v2) Discussion

C# 6.0 Language Preview

Upvotes: 285

anderly

Reputation: 727

You can accomplish this with Expansive: https://github.com/anderly/Expansive

Upvotes: 0

David Clarke

Reputation: 13256

You can use string.Format to drop values into strings:

private static readonly string formatString = "This is {0}overflow";
...
var strVar = "stack";
var myStr = string.Format(formatString, "stack");

An alternative is to use the C# concatenation operator:

var strVar = "stack";
var myStr = "This is " + strVar + "overflow";

If you're doing a lot of concatenations use the StringBuilder class which is more efficient:

var strVar = "stack";
var stringBuilder = new StringBuilder("This is ");
for (;;)
{
    stringBuilder.Append(strVar); // spot the deliberate mistake ;-)
}
stringBuilder.Append("overflow");
var myStr = stringBuilder.ToString();

Upvotes: 14

DwayneAllen

Reputation: 19

You have 2 options. You can either use String.Format or you can use the concatenation operator.

String newString = String.Format("I inserted this string {0} into this one", oldstring);

String newString = "I inserted this string " + oldstring + " into this one";

Upvotes: 1

Bruno Silva

Reputation: 3097

You should be using String.Format(). The syntax is a bit different, numerical placeholders are used instead.

Example:

String.Format("item {0}, item {1}", "one", "two")

Have a look at http://msdn.microsoft.com/en-us/library/system.string.format.aspx for more details.

Upvotes: 4

Phillip Ngan

Reputation: 16096

Use:

strVar = "stack"
mystr  = String.Format("This is {0}", strVar);

Upvotes: 0

CodesInChaos

Reputation: 108790

There is no operator for that. You need to use string.Format.

string strVar = "stack";
string mystr  = string.Format("This is {0}soverflow", strVar);

Unfortunately string.Format is a static method, so you can't simply write "This is {0}soverflow".Format(strVar). Some people have defined an extension method, that allows this syntax.

Upvotes: 6

How do I interpolate strings?

Answers (16)

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