I am going to go with my gut feeling and assume you want to concatenate the result of calling ToString on each element of the list.
var result = string.Join(",", list.ToArray());
The direct answer to your question is String.Join as others have mentioned.
However, if you need some manipulations, you can use Aggregate:
List<string> employees = new List<string>();
employees.Add("e1");
employees.Add("e2");
employees.Add("e3");
string employeesString = "'" + employees.Aggregate((x, y) => x + "','" + y) + "'";
Console.WriteLine(employeesString);
Console.ReadLine();
This seems to work for me.
var combindedString = new string(list.ToArray());
The .ToString() method for reference types usually resolves back to System.Object.ToString() unless you override it in a derived type (possibly using extension methods for the built-in types). The default behavior for this method is to output the name of the type on which it's called. So what you're seeing is expected behavior.
You could try something like string.Join(", ", myList.ToArray()); to achieve this. It's an extra step, but it could be put in an extension method on System.Collections.Generic.List<T> to make it a bit easier. Something like this:
public static class GenericListExtensions
{
public static string ToString<T>(this IList<T> list)
{
return string.Join(", ", list);
}
}
(Note that this is free-hand and untested code. I don't have a compiler handy at the moment. So you'll want to experiment with it a little.)
This method helped me when trying to retrieve data from Text File and store it in Array then Assign it to a string avariable.
string[] lines = File.ReadAllLines(Environment.CurrentDirectory + "\\Notes.txt");
string marRes = string.Join(Environment.NewLine, lines.ToArray());
Hopefully may help Someone!!!!
If you're looking to turn the items in a list into a big long string, do this: String.Join("", myList). Some older versions of the framework don't allow you to pass an IEnumerable as the second parameter, so you may need to convert your list to an array by calling .ToArray().
You could use string.Join:
List<string> list = new List<string>()
{
"Red",
"Blue",
"Green"
};
string output = string.Join(Environment.NewLine, list.ToArray());
Console.Write(output);
The result would be:
Red
Blue
Green
As an alternative to Environment.NewLine, you can replace it with a string based line-separator of your choosing.
You have a List<string> - so if you want them concatenated, something like
string s = string.Join("", list);
would work (in .NET 4.0 at least). The first parameter is the delimiter. So you could also comma-delimit etc.
You might also want to look at using StringBuilder to do running concatenations, rather than forming a list.
If you want something slightly more complex than a simple join you can use LINQ e.g.
var result = myList.Aggregate((total, part) => total + "(" + part.ToLower() + ")");
Will take ["A", "B", "C"] and produce "(a)(b)(c)"
If your list has fields/properties and you want to use a specific value (e.g. FirstName), then you can do this:
string combindedString = string.Join( ",", myList.Select(t=>t.FirstName).ToArray() );
String.Join(" ", myList) or String.Join(" ", myList.ToArray()). The first argument is the separator between the substrings.
var myList = new List<String> { "foo","bar","baz"};
Console.WriteLine(String.Join("-", myList)); // prints "foo-bar-baz"
Depending on your version of .NET you might need to use ToArray() on the list first..
It's hard to tell, but perhaps you're looking for something like:
var myString = String.Join(String.Empty, myList.ToArray());
This will implicitly call the ToString() method on each of the items in the list and concatenate them.
Source: Stackoverflow.com