Open Net File
Nov 12, 2018 How to Open a File in Windows. WikiHow is a wiki similar to Wikipedia, which means that many of our articles are written collaboratively. To create this article, 11 people, some anonymous, worked to edit and improve it over time. This article has also been viewed 107,579 times.
Definition
Overloads
| Open(String, FileMode)Open(String, FileMode)Open(String, FileMode)Open(String, FileMode) | Opens a FileStream on the specified path with read/write access with no sharing. |
| Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess) | Opens a FileStream on the specified path, with the specified mode and access with no sharing. |
| Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare) | Opens a FileStream on the specified path, having the specified mode with read, write, or read/write access and the specified sharing option. |
Open(String, FileMode)Open(String, FileMode)Open(String, FileMode)Open(String, FileMode)
Opens a FileStream on the specified path with read/write access with no sharing.
Parameters
- mode
- FileModeFileModeFileModeFileMode
A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.
Returns
A FileStream opened in the specified mode and path, with read/write access and not shared.
Exceptions
path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.
path is null.
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The specified path, file name, or both exceed the system-defined maximum length.
The specified path is invalid, (for example, it is on an unmapped drive).
An I/O error occurred while opening the file.
path specified a file that is read-only.
-or-
This operation is not supported on the current platform.
-or-
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path specified a directory.
-or-
The caller does not have the required permission.
-or-
mode is Create and the specified file is a hidden file.
mode specified an invalid value.
The file specified in path was not found.
path is in an invalid format.
Examples
The following code example creates a temporary file and writes some text to it. The example then opens the file, using T:System.IO.FileMode.Open; that is, if the file did not already exist, it would not be created.
Remarks
The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.
For a list of common I/O tasks, see Common I/O Tasks.
Security
FileIOPermission
for reading from and writing to the specified file. Associated enumerations: Read, Write
- See also
Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess)Open(String, FileMode, FileAccess)
Opens a FileStream on the specified path, with the specified mode and access with no sharing.
Parameters
- mode
- FileModeFileModeFileModeFileMode
A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.
- access
- FileAccessFileAccessFileAccessFileAccess
A FileAccess value that specifies the operations that can be performed on the file.
Returns
An unshared FileStream that provides access to the specified file, with the specified mode and access.
Exceptions
path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.
-or-
access specified Read and mode specified Create, CreateNew, Truncate, or Append.
path is null.
The specified path, file name, or both exceed the system-defined maximum length.
The specified path is invalid, (for example, it is on an unmapped drive).
An I/O error occurred while opening the file.
path specified a file that is read-only and access is not Read.
-or-
path specified a directory.
-or-
The caller does not have the required permission.
-or-
mode is Create and the specified file is a hidden file.
mode or access specified an invalid value.
The file specified in path was not found.
path is in an invalid format.
Examples
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The following example opens a file with read-only access.
Remarks
The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.
Security
FileIOPermission
for reading from and writing to the specified file. Associated enumerations: Read, Write
- See also
Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare)Open(String, FileMode, FileAccess, FileShare)
Opens a FileStream on the specified path, having the specified mode with read, write, or read/write access and the specified sharing option.
Parameters
- mode
- FileModeFileModeFileModeFileMode
A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.
- access
- FileAccessFileAccessFileAccessFileAccess
A FileAccess value that specifies the operations that can be performed on the file.
- share
- FileShareFileShareFileShareFileShare
A FileShare value specifying the type of access other threads have to the file.
Returns
A FileStream on the specified path, having the specified mode with read, write, or read/write access and the specified sharing option.
Exceptions
path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.
-or-
access specified Read and mode specified Create, CreateNew, Truncate, or Append.
path is null.
The specified path, file name, or both exceed the system-defined maximum length.
The specified path is invalid, (for example, it is on an unmapped drive).
An I/O error occurred while opening the file.
Open Org File
path specified a file that is read-only and access is not Read.
-or-
path specified a directory.
-or-
The caller does not have the required permission.
-or-
mode is Create and the specified file is a hidden file.
mode, access, or share specified an invalid value.
The file specified in path was not found.
path is in an invalid format.
Examples
The following example opens a file with read-only access and with file sharing disallowed.
Remarks
The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.
For a list of common I/O tasks, see Common I/O Tasks.
Security
FileIOPermission
for reading from and writing to the specified file. Associated enumerations: Read, Write
- See also