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Update Path.GetDirectoryName Snippet3 #10853

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Merged
merged 1 commit into from
Jan 21, 2025
+25 −26
Merged

Update Path.GetDirectoryName Snippet3 #10853

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51 changes: 25 additions & 26 deletions snippets/csharp/System.IO/Path/ChangeExtension/pathmembers.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -61,31 +61,30 @@ public void Combine()
public void GetDirectoryName()
{
// <Snippet3>
string filePath = @"C:\MyDir\MySubDir\myfile.ext";
string directoryName;
int i = 0;

while (filePath != null)
{
directoryName = Path.GetDirectoryName(filePath);
Console.WriteLine("GetDirectoryName('{0}') returns '{1}'",
filePath, directoryName);
filePath = directoryName;
if (i == 1)
{
filePath = directoryName + @"\"; // this will preserve the previous path
}
i++;
}
/*
This code produces the following output:

GetDirectoryName('C:\MyDir\MySubDir\myfile.ext') returns 'C:\MyDir\MySubDir'
GetDirectoryName('C:\MyDir\MySubDir') returns 'C:\MyDir'
GetDirectoryName('C:\MyDir\') returns 'C:\MyDir'
GetDirectoryName('C:\MyDir') returns 'C:\'
GetDirectoryName('C:\') returns ''
*/
string? filePath = @"C:\MyDir\MySubDir\myfile.ext";
string? directoryName;
int i = 0;

while (filePath != null)
{
directoryName = Path.GetDirectoryName(filePath);
Console.WriteLine($"GetDirectoryName(\"{filePath}\") returns {directoryName ?? "NULL"}");

filePath = (i == 1)
? directoryName + @"\" // this will preserve the previous path
: directoryName;

i++;
}
/*
This code produces the following output:

GetDirectoryName("C:\MyDir\MySubDir\myfile.ext") returns C:\MyDir\MySubDir
GetDirectoryName("C:\MyDir\MySubDir") returns C:\MyDir
GetDirectoryName("C:\MyDir\") returns C:\MyDir
GetDirectoryName("C:\MyDir") returns C:\
GetDirectoryName("C:\") returns NULL
*/
// </Snippet3>

Console.WriteLine();
Expand Down Expand Up @@ -378,4 +377,4 @@ public static void Main()
pathSnippets.HasExtension();
pathSnippets.IsPathRooted();
}
}
}
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