Addressing Long File Path Issues in .NET Applications
.NET applications can encounter problems when working with file paths exceeding the standard 259-character limit. This limitation affects both the built-in FileInfo
class and native Win32 functions accessed via P/Invoke.
Here are effective strategies for managing excessively long file paths:
Leveraging Long Path Syntax (.NET 4.6.2 and later):
For .NET Framework 4.6.2 and newer versions, prepend the path with "?" (e.g., "?C:..."). This bypasses path normalization and ensures the full path is passed directly to the file system.
Utilizing Unicode-Compliant Win32 APIs (Pre .NET 4.6.2):
In versions prior to .NET 4.6.2, combine the "?" prefix with Unicode versions of Win32 API functions (like GetFileAttributesExW
) accessed through P/Invoke. These functions explicitly support extended path lengths.
.NET Core's Built-in Support:
.NET Core and later versions inherently handle long paths, eliminating the need for manual workarounds.
Important Considerations:
Keep these limitations in mind when working with long paths:
LoadLibrary
, might still fail with paths longer than 260 characters.The above is the detailed content of How Can I Handle Excessively Long File Paths in .NET?. For more information, please follow other related articles on the PHP Chinese website!