StreamReader Constructor (String, Encoding)
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When it is called by trusted applications, initializes a new instance of the StreamReader class for the specified file name, using the specified character encoding.
Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Sub New ( _
path As String, _
encoding As Encoding _
)
public StreamReader(
string path,
Encoding encoding
)
Parameters
- path
Type: System.String
The complete file path to be read.
- encoding
Type: System.Text.Encoding
The character encoding to use.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException | path is an empty string (""). |
| ArgumentNullException | path or encoding is nulla null reference (Nothing in Visual Basic). |
| FileNotFoundException | The file cannot be found. |
| DirectoryNotFoundException | The specified path is invalid; for example, it might refer to an unmapped drive. |
| NotSupportedException | path includes an incorrect or invalid syntax for file name, directory name, or volume label. |
Remarks
This constructor initializes the encoding as specified by the encoding parameter, and the internal buffer to the default size. The StreamReader object attempts to detect the encoding by looking at the first three bytes of the stream. It automatically recognizes UTF-8, little-endian Unicode, and big-endian Unicode text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the Encoding.GetPreamble method for more information.
The path parameter can be a file name, including a file on a Universal Naming Convention (UNC) share.
The path parameter is not required to be a file stored on disk; it can be any part of a system that supports access using streams.
.gif "Caution note") Caution: |
|---|
When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown. |
Platform Notes
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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.