原文：https://blog.csdn.net/HeBizhi1997/article/details/123544524
C# 10.0 对字符串插值做了点提升，支持开发人员对字符串进行花式内插。 附官方教程： https://docs.microsoft.com/zh-cn/dotnet/csharp/tutorials/string-interpolation#code-try-0icon-default.png?t=M276https://docs.microsoft.com/zh-cn/dotnet/csharp/tutorials/string-interpolation#code-try-0
对比一下string.Format的方式，我想看下层层包装之后，性能上的差别。 先说下我机器的配置：
#region 测试代码
var a = 3;
var b = 2;
var list = new List<int>();
Console.WriteLine("strat method one");
for (int j = 0; j < 10; j )
{
var dt1 = DateTime.Now;
//Console.WriteLine(dt1.ToString("HH:mm ffff"));
for (int i = 0; i < 1_0000_0000; i )
{
var c = $"{a} {b} = {a b}";
}
var dt2 = DateTime.Now;
//Console.WriteLine(dt2.ToString("HH:mm ffff"));
Console.WriteLine("times " j " : " (dt2 - dt1).Milliseconds);
list.Add((dt2 - dt1).Milliseconds);
}
list.Remove(list.Max());
list.Remove(list.Min());
Console.WriteLine(list.Average());
list.Clear();
Console.WriteLine("strat method two");
for (int j = 0; j < 10; j )
{
var dt1 = DateTime.Now;
//Console.WriteLine(dt1.ToString("HH:mm ffff"));
for (int i = 0; i < 1_0000_0000; i )
{
var c = string.Format("{0} {1} = {2}", a, b, a b);
}
var dt2 = DateTime.Now;
//Console.WriteLine(dt2.ToString("HH:mm ffff"));
Console.WriteLine("times " j " : " (dt2 - dt1).Milliseconds);
list.Add((dt2 - dt1).Milliseconds);
}
list.Remove(list.Max());
list.Remove(list.Min());
Console.WriteLine(list.Average());
#endregion输出结果：
结论：从测试结果来说，string.Format占用的cpu资源更稳定，$语法糖就有些飘忽不定。
但是无论是从功能扩展还是长期性能考虑来看的话，只能说微软牛逼，语法糖真香。
附录：之前的测试代码反编译一下的结果
代码语言：javascript复制int a = 3;
int b = 2;
List<int> list = new List<int>();
Console.WriteLine("strat method one");
for (int i = 0; i < 10; i )
{
DateTime dt = DateTime.Now;
for (int j = 0; j < 100000000; j )
{
DefaultInterpolatedStringHandler defaultInterpolatedStringHandler = new DefaultInterpolatedStringHandler(6, 3);
defaultInterpolatedStringHandler.AppendFormatted<int>(a);
defaultInterpolatedStringHandler.AppendLiteral(" ");
defaultInterpolatedStringHandler.AppendFormatted<int>(b);
defaultInterpolatedStringHandler.AppendLiteral(" = ");
defaultInterpolatedStringHandler.AppendFormatted<int>(a b);
string c = defaultInterpolatedStringHandler.ToStringAndClear();
}
DateTime dt2 = DateTime.Now;
Console.WriteLine("times " i.ToString() " : " (dt2 - dt).Milliseconds.ToString());
list.Add((dt2 - dt).Milliseconds);
}
list.Remove(list.Max());
list.Remove(list.Min());
Console.WriteLine(list.Average());
list.Clear();
Console.WriteLine("strat method two");
for (int k = 0; k < 10; k )
{
DateTime dt3 = DateTime.Now;
for (int l = 0; l < 100000000; l )
{
string c2 = string.Format("{0} {1} = {2}", a, b, a b);
}
DateTime dt4 = DateTime.Now;
Console.WriteLine("times " k.ToString() " : " (dt4 - dt3).Milliseconds.ToString());
list.Add((dt4 - dt3).Milliseconds);
}
list.Remove(list.Max());
list.Remove(list.Min());
Console.WriteLine(list.Average());
