Insert variable values in the middle of a string
C#StringC# Problem Overview
In C#: If I want to create a message like this: "Hi We have these flights for you: Flight A,B,C,D. Which one do you want"
where just the section in bold is dynamic and I pass its value at run time, but its left and right parts are fixed. I can create something like LeftMessage + those variables + RightMessage to create this. But I was wondering if there is a way of doing it all at once without the need to create two separate left and right messages?
For translation purposes I am putting those left and right messages inside string resources so now I have two separate string resources. Is there a way to do it all at once?
C# Solutions
Solution 1 - C#
There's now (C# 6) a more succinct way to do it: string interpolation.
From another question's answer:
> In C# 6 you can use string interpolation: > > string name = "John"; > string result = $"Hello {name}"; > > The syntax highlighting for this in Visual Studio makes it highly > readable and all of the tokens are checked. >
Solution 2 - C#
You can use string.Format
:
string template = "Hi We have these flights for you: {0}. Which one do you want";
string data = "A, B, C, D";
string message = string.Format(template, data);
You should load template
from your resource file and data
is your runtime values.
Be careful if you're translating to multiple languages, though: in some cases, you'll need different tokens (the {0}
) in different languages.
Solution 3 - C#
Use String.Format
Pre C# 6.0
string data = "FlightA, B,C,D";
var str = String.Format("Hi We have these flights for you: {0}. Which one do you want?", data);
C# 6.0 -- String Interpolation
string data = "FlightA, B,C,D";
var str = $"Hi We have these flights for you: {data}. Which one do you want?";
Solution 4 - C#
String.Format("Hi We have these flights for you: {0}. Which one do you want",
flights);
EDIT: you can even save the "template" string separately (for instance you could store it in a configuration file and retrieve it from there), like this:
string flights = "Flight A, B,C,D";
string template = @"Hi We have these flights for you: {0}. Which one do you want";
Console.WriteLine(String.Format(template, flights));
EDIT2: whoops, sorry I see that @DanPuzey had already suggested something very similar to my EDIT (but somewhat better)
Solution 5 - C#
1 You can use string.Replace
method
var sample = "testtesttesttest#replace#testtesttest";
var result = sample.Replace("#replace#", yourValue);
2 You can also use string.Format
var result = string.Format("your right part {0} Your left Part", yourValue);
3 You can use Regex class
Solution 6 - C#
I would use a StringBuilder class for doing string manipulation as it will more efficient (being mutable)
string flights = "Flight A, B,C,D";
StringBuilder message = new StringBuilder();
message.Append("Hi We have these flights for you: ");
message.Append(flights);
message.Append(" . Which one do you want?");