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}""");
}
}
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 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"
