C# 中的字符串内插-JZTXT

var date = new DateTime(1731, 11, 25);
Console.WriteLine($"On {date:dddd, MMMM dd, yyyy} Leonhard Euler introduced the letter e to denote
{Math.E:F5} in a letter to Christian Goldbach.");
// Expected output:
// On Sunday, November 25, 1731 Leonhard Euler introduced the letter e to denote 2.71828 in a letter to Christian Goldbach.

一. 如何控制设置了格式的内插表达式的字段宽度和对齐方式

通过在内插表达式后添加逗号（“,”）和常数表达式来指定设置了格式的表达式结果的最小字段宽度和对齐方式：
{<interpolationExpression>,<alignment>}
如果对齐方式值为正，则设置了格式的表达式结果为右对齐，如果为负，则为左对齐。
如果需要同时指定对齐方式和格式字符串，则先从对齐方式组件开始：
{<interpolationExpression>,<alignment>:<formatString>}

示例演示

const int NameAlignment = -9;
const int ValueAlignment = 7;
double a = 3;
double b = 4;
Console.WriteLine($"Three classical Pythagorean means of {a} and {b}:");
Console.WriteLine($"|{"Arithmetic",NameAlignment}|{0.5 * (a + b),ValueAlignment:F3}|");
Console.WriteLine($"|{"Geometric",NameAlignment}|{Math.Sqrt(a * b),ValueAlignment:F3}|");
Console.WriteLine($"|{"Harmonic",NameAlignment}|{2 / (1 / a + 1 / b),ValueAlignment:F3}|");
// Expected output:
// Three classical Pythagorean means of 3 and 4:
// |Arithmetic| 3.500|
// |Geometric| 3.464|
// |Harmonic | 3.429|