C # 8.0 中的插值逐字字符串
原文:https://www . geesforgeks . org/interpoled-逐字-strings-in-c-sharp-8-0/
前提条件:字符串插值和逐字字符串
在 C# 8.0 之前，您可以一起使用字符串插值($)和逐字标识符(@)，但要按照特定的顺序。这意味着当您同时使用$ token 和@ token 时，$ token 必须出现在@ token 之前。如果您在$ token 之前使用@ token，那么编译器会给您一个错误，如下例所示:
例 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}""");
}
}
输出:
Finding the area of a triangle:
Height = "30" and Base = "10"
Area = "150"
例 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(@ {content}quot;Height = ""{Height}"" and Base = ""{Base}""");
Console.WriteLine(@ {content}quot;Area = ""{area}""");
}
}
错误:
错误 CS1646:逐字说明符后需要关键字、标识符或字符串:@ 错误 CS1646:逐字说明符后需要关键字、标识符或字符串:@
当我们在$ token 之前使用@ token 时，编译器会给出一个错误。这个问题在 C# 8.0 中得到了解决，现在您可以在$ token 之前使用@ token，或者在@ token 之前使用$ token
$@"..."
Or
@{content}quot;..."
编译器不会给出错误。如下例所示:
示例:
// 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(@{content}quot;Area = ""{area}""");
}
}
}
输出:
Finding the area of a triangle:
Height = "80" and Base = "40"
Area = "1600"
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