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Add example of concatenated interpolated strings #29785

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14 changes: 14 additions & 0 deletions docs/csharp/language-reference/tokens/interpolated.md
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Expand Up @@ -94,6 +94,20 @@ The following example uses implicit conversion to <xref:System.FormattableString

:::code language="csharp" source="./snippets/string-interpolation.cs" id="Snippet4":::

## Combining multiple interpolated strings

To combine multiple interpolated strings, use the interpolation expression for each:
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@gewarren gewarren Jun 13, 2022

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I'd change this to:

To combine multiple interpolated strings, add the `$` special character to each string literal.


```csharp
var firstWord = "Hello";
var secondWord = "World";

var combinedInterpolatedString = $"{firstWord}, " + $"{secondWord}!";
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@gewarren gewarren Jun 13, 2022

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Why wouldn't this just be:

var combinedInterpolatedString = $"{firstWord}, {secondWord}!";

@BillWagner

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@BillWagner BillWagner Jun 13, 2022

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That would work, but wouldn't show the example as concatenating two interpolated strings. Admittedly, in this case, a single interpolated string would be clear. This would normally be done when all the source expressions were more complex.

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@SeanKilleen SeanKilleen Jun 13, 2022

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@gewarren it could be, for sure. I was using an example provided in the initial issue, which discussed concatenating multiple strings together specifically. So it may be that in the context of the example, the usefulness is lost.

Perhaps I could add something like "bear in mind, you could also accomplish this via" and use the syntax you've provided above?

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@BillWagner BillWagner Jun 13, 2022

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@SeanKilleen I'd prefer a more involved example where two different interpolated strings are constructed, then concatenated.

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@gewarren gewarren Jun 13, 2022

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I agree with Bill here. I don't think this is a good example.


Console.WriteLine(combinedInterpolatedString)
// output: "Hello, World!"
```

## Other resources

If you're new to string interpolation, see the [String interpolation in C#](../../tutorials/exploration/interpolated-strings.yml) interactive tutorial. You can also check another [String interpolation in C#](../../tutorials/string-interpolation.md) tutorial. That tutorial demonstrates how to use interpolated strings to produce formatted strings.
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