27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
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---
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title: String Interpolation
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---
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# String Interpolation
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In C#, typically to concatenate strings you would either use the “+” operator or composite formatting with a method such as String.Format. By composite formatting I am referring to a format string with indexed placeholders (format items) and a list of objects to be used in the placeholders.
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##
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```
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string message = "Hello " + firstName + " " + lastName + "!";
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string message2 = string.Format("Hello {0} {1}!", firstName, lastName);
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```
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With interpolated string expressions, you have a string with contained expressions that are replaced with the expressions’ results. You have to prefix your string literal with a dollar sign ($). The expressions you want included in the string are placed inline enclosed in curly braces. The above message would now look like this:
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##
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```
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string message = $"Hello {firstName} {lastName}!";
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```
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**Small Bit Of Useful Information**
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In string interpolation you have the ability to call functions, properties and ternary operators:
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```
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int a = 3;
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int b = 454;
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string result = $"{a}+{b} = {a+b}";
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```
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