使用附加连接将字符串数组转换为逗号分隔的字符串

Question

Is there any way to convert a list of strings to a comma-separated string?

String[] data = new String[] { "test", "abc", "123" }

Convert into:

'test', 'abc', '123'

Possible solutions:

1. Surround every string with '' and then use String.join on the list.
2. Foreach each string in the list and do the concatenation of '' and ',' and in the end remove last ','

Is there any simple Linq (one line expression) to do both?

Answer 1

Is there any simple Linq (one line expression) to do both.

string.Join(",", data.Select(item => "'" + item + "'"))

Basics of Linq: Transforms are Select statements. Filters are Where statements.

That said, there are a lot of string manipulation tools available that aren't Linq, and they're more likely to be optimized for strings, so I'd always look to them before looking to Linq.

Answer 2

您可以使用聚合 linq

Array.Skip(1).Aggregate(Array[0],(a,b) => string.Format("{0},'{1}'",a,b));

Answer 3

String[] data = new String[]{"test","abc","123"};
var result = string.Join(",", data.Select(o => string.Concat("'",o,"'"));

Answer 4

You could also use the Aggregate method: Example:

List<string> fruit = new List<string> {"Apple", "Orange", "Pear", "Tomato", "Banana"};
var fruitSentence = fruit.Aggregate((current, next) => $"{current},{next}");

Answer 5

NOTE: if you're starting with IEnumerable or similar you have to call .ToArray() at the end of the LINQ statement like this:

input parameter: IEnumerable<string> feederIdList    

var feederListString = String.Join(",", feederIdList.Select(feeder => "\"" + feeder + "\"").ToArray());

In my case I needed each string to have double quotes around it for passing into an Oracle stored procedure later.