Interpolated Verbatim Strings in C# 8.0

Last Updated : 29 Dec, 2019

Prerequisite: String Interpolation and Verbatim String

Before C# 8.0 you are allowed to use string interpolation($) and verbatim identifier(@) together but in a specific sequence. It means when you use $ token and @ token together, it is necessary that $ token must appear before the @ token. If you use the @ token before $ token, then the compiler will give you an error, like as shown in the below example:

Example 1:

// C# program to illustrate the use 
// of interpolated verbatim strings 
using System; 
   
class GFG { 
      
    // Main Method 
    static void Main() 
    { 
        int Base = 10; 
        int Height = 30; 
        int area = (Base * Height) / 2; 
   
        // Here, $ token appears before @ token 
        Console.WriteLine("Finding the area of a triangle:"); 
        Console.WriteLine($@"Height = ""{Height}"" and Base = ""{Base}"""); 
        Console.WriteLine($@"Area = ""{area}"""); 
    } 
} 

Output:

Finding the area of a triangle:
Height = "30" and Base = "10"
Area = "150"

Example 2:

// C# program to illustrate the use  
// of interpolated verbatim strings 
using System; 
   
class GFG { 
      
    // Main Method 
    static void Main() 
    { 
        int Base = 10; 
        int Height = 30; 
        int area = (Base * Height) / 2; 
   
        // Here, @ token appears before $ token 
        // But the compiler will give an error 
        Console.WriteLine("Finding the area of a triangle:"); 
        Console.WriteLine(@ $"Height = ""{Height}"" and Base = ""{Base}""");                    
        Console.WriteLine(@ $"Area = ""{area}"""); 
    } 
} 

Error:

error CS1646: Keyword, identifier, or string expected after verbatim specifier: @
error CS1646: Keyword, identifier, or string expected after verbatim specifier: @

When we use a @ token before $ token, then the compiler gives an error. This problem is solved in C# 8.0, now you are allowed to use a @ token before $ token or $ token before @ token

$@"..."
Or
@$"..."

and the compiler will not give an error. As shown in the below example:

Example:

// C# program to illustrate the use 
// of interpolated verbatim strings 
using System; 
   
namespace Geeks { 
      
class GFG { 
      
    // Main Method 
    static void Main(string[] args) 
    { 
        int Base = 40; 
        int Height = 80; 
        int area = (Base * Height) / 2; 
        Console.WriteLine("Finding the area of a triangle:"); 
   
        // Here, $ token appears before @ token 
        Console.WriteLine($@"Height = ""{Height}"" and Base = ""{Base}"""); 
   
        // Here, @ token appears before $ token 
        Console.WriteLine(@$"Area = ""{area}"""); 
    } 
} 
} 

Output:

Finding the area of a triangle:
Height = "80" and Base = "40"
Area = "1600"

My Personal Notes

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Prerequisite: String Interpolation and Verbatim String