File.OpenText Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
When it is called by trusted applications, opens an existing UTF-8 encoded text file for reading.
Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function OpenText ( _
path As String _
) As StreamReader
public static StreamReader OpenText(
string path
)
Parameters
- path
Type: System.String
The file to be opened for reading.
Return Value
Type: System.IO.StreamReader
A StreamReader on the specified path.
Exceptions
| Exception | Condition |
|---|---|
| UnauthorizedAccessException | The caller does not have the required permission. |
| ArgumentException | path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars. |
| ArgumentNullException | path is nulla null reference (Nothing in Visual Basic). |
| PathTooLongException | The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters. |
| DirectoryNotFoundException | The specified path is invalid, (for example, it is on an unmapped drive). |
| FileNotFoundException | The file specified in path was not found. |
| NotSupportedException | path is in an invalid format. |
Remarks
For more information about trusted applications, see Elevated Trust.
Platform Notes
.png "Silverlight for Windows Phone"){kind=icon}
Silverlight for Windows Phone
This member has a SecurityCriticalAttribute attribute on Silverlight for Windows Phone, because the attribute was present in Silverlight 3. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.
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.