LINQ to Objects supports queries on string objects but when I use code such as below:
string SomeText = "this is some text in a string";
return SomeText.Take(6).ToString();
All I get is:
System.Linq.Enumerable+<TakeIterator>d__3a`1[System.Char]
This is discussed as an "accident" in this question but this is what I am actually trying to do and I cannot find it through search anywhere.
I know there are other ways to manipulate strings but then I also know you can do some really cool tricks with LINQ and I just would like to know if there is a way to trim a string to a certain length with LINQ?
There's no method built in to System.Linq to do this, but you could write your own extension method fairly easily:
public static class StringExtensions
{
public static string ToSystemString(this IEnumerable<char> source)
{
return new string(source.ToArray());
}
}
Unfortunately, because object.ToString
exists on all .NET objects, you would have to give the method a different name so that the compiler will invoke your extension method, not the built-in ToString
.
As per your comment below, it's good to question whether this is the right approach. Because String
exposes a lot of functionality through its public methods, I would implement this method as an extension on String
itself:
/// <summary>
/// Truncates a string to a maximum length.
/// </summary>
/// <param name="value">The string to truncate.</param>
/// <param name="length">The maximum length of the returned string.</param>
/// <returns>The input string, truncated to <paramref name="length"/> characters.</returns>
public static string Truncate(this string value, int length)
{
if (value == null)
throw new ArgumentNullException("value");
return value.Length <= length ? value : value.Substring(0, length);
}
You would use it as follows:
string SomeText = "this is some text in a string";
return SomeText.Truncate(6);
This has the advantage of not creating any temporary arrays/objects when the string is already shorter than the desired length.