用于将双精度数组转换为逗号分隔的字符串的lambda表达式

Question

I want to convert the double array into comma separated string. Is it doable with lambda expression:

double [] test = new double [] {1 ,2, 3} ;

for example, I want to convert above array in comma separated string using lambda expression.

Answer 1

Try this .Net version 4+

var result = String.Join(",", test);

read more about String.Join .

It's not lambda expression, but I think that this is what you were looking for. Lamda expression are just delegates, so you don't need lambda here :)

Lambda Expression c#

EDIT:

for version .Net < 4.0 String.Join accepts only string[] (thanks @SonerGönül) and you need to use this:

var result = String.Join(",", test.Select(x=>x.ToString()).ToArray());

which will convert double [] test to string array. Example

Answer 2

如果您需要以特殊方式格式化双打，可以这样：

var result = String.Join(",", test.Select(d => d.ToString("000000")));