Uri.IsUnc Property
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Gets whether the specified Uri is a universal naming convention (UNC) path.
Namespace: System
Assembly: System (in System.dll)
Syntax
'Declaration
Public ReadOnly Property IsUnc As Boolean
public bool IsUnc { get; }
Property Value
Type: System.Boolean
A Boolean value that is true if the Uri is a UNC path; otherwise, false.
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | This property is valid only for an absolute Uri instance. |
Remarks
The IsUnc property is true if the specified Uri instance is a UNC path (such as \\server\folder or file://server/folder). This property always returns true if the URI has the file:// scheme and specifies a host component.
Silverlight-based applications are cross-platform, so they run in most modern Web browsers, including Apple Safari version 2.0 and later on Apple Mac OS X. However, full parsing for UNC style paths in a Uri is supported only on Windows. Any backslashes in a Uri for the UriSchemeFile representing a UNC path are converted to forward slashes on Apple Mac OS X.
An example that displays this issue is below:
Uri testUri = Uri(@"file://\\computer\download\file.ext");
On Windows, this UNC path is converted to the following Uri:
file://computer/download/file.ext
The AbsolutePath is /download/file.ext.
The Host property is equal to: computer.
The IsUnc property is true.
The LocalPath property is \\computer\download\file.ext.
On Apple Mac OS X, this UNC path is converted to the following Uri:
file::////computer/download/file.ext
The AbsolutePath property is //computer/download/file.ext.
The Host property is an empty string.
The IsUnc property is false.
The LocalPath property is computer/download/file.ext.
Examples
The following example creates a Uri instance and determines whether it is a UNC path.
Dim uriAddress2 As Uri = New Uri("file://server/filename.ext")
outputBlock.Text &= uriAddress2.LocalPath
outputBlock.Text &= vbCrLf
If uriAddress2.IsUnc Then
outputBlock.Text &= "Uri is a UNC path"
outputBlock.Text &= vbCrLf
Else
outputBlock.Text &= "Uri is not a UNC path"
outputBlock.Text &= vbCrLf
End If
Uri uriAddress2 = new Uri("file://server/filename.ext");
outputBlock.Text += uriAddress2.LocalPath;
outputBlock.Text += "\n";
if (uriAddress2.IsUnc)
outputBlock.Text += "Uri is a UNC path\n";
else
outputBlock.Text += "Uri is not a UNC path\n";
Uri uriAddress2 = new Uri("file://server/filename.ext");
Console.WriteLine(uriAddress2.LocalPath);
Console.WriteLine("Uri {0} a UNC path", uriAddress2.IsUnc ? "is" : "is not");
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.