I don't quite see the difference.
What could Path.Combine
do better than perfectly working string concatenation?
I guess it's doing something very similar in the background.
Can anyone tell me why it is so often preferred?
Path.Combine
uses the Path.PathSeparator
and it checks whether the first path already has a separator at the end so it will not duplicate the separators. Additionally, it checks whether the path elements to combine have invalid chars.
Path.Combine
does more things than just a string concatenation. If you look at the source code ;
Here is the implementation
public static string Combine(string path1, string path2)
{
if (path1 == null || path2 == null)
{
throw new ArgumentNullException((path1 == null) ? "path1" : "path2");
}
Path.CheckInvalidPathChars(path1, false);
Path.CheckInvalidPathChars(path2, false);
return Path.CombineNoChecks(path1, path2);
}
private static string CombineNoChecks(string path1, string path2)
{
if (path2.Length == 0)
{
return path1;
}
if (path1.Length == 0)
{
return path2;
}
if (Path.IsPathRooted(path2))
{
return path2;
}
char c = path1[path1.Length - 1];
if (c != Path.DirectorySeparatorChar && c != Path.AltDirectorySeparatorChar && c != Path.VolumeSeparatorChar)
{
return path1 + Path.DirectorySeparatorChar + path2;
}
return path1 + path2;
}
According to this documentation Path.Combine
internally performs a string concatenation using +-Operator
.
private static String CombineNoChecks(String path1, String path2) {
if (path2.Length == 0)
return path1;
if (path1.Length == 0)
return path2;
if (IsPathRooted(path2))
return path2;
char ch = path1[path1.Length - 1];
if (ch != DirectorySeparatorChar && ch != AltDirectorySeparatorChar && ch != VolumeSeparatorChar)
return path1 + DirectorySeparatorCharAsString + path2;
return path1 + path2;
}
You avoid double path separators. If one path element already has a leading backslash. Path.Combine checks for that and ensures that only one backslash is present.
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