FileMode Enumeration

Specifies how the operating system should open a file.

Namespace: CMS.IO
Assembly: CMS.IO (in CMS.IO.dll) Version: 8.0.0.0 (8.0.5239.26125)

Members

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	Member name	Value	Description
	CreateNew	1	Specifies that the operating system should create a new file. This requires System.Security.Permissions.FileIOPermissionAccess.Write. If the file already exists, an System.IO.IOException is thrown.
	Create	2	Specifies that the operating system should create a new file. If the file already exists, it will be overwritten. This requires System.Security.Permissions.FileIOPermissionAccess.Write. System.IO.FileMode.Create is equivalent to requesting that if the file does not exist, use System.IO.FileMode.CreateNew; otherwise, use System.IO.FileMode.Truncate.
	Open	3	Specifies that the operating system should open an existing file. The ability to open the file is dependent on the value specified by System.IO.FileAccess. A System.IO.FileNotFoundException is thrown if the file does not exist.
	OpenOrCreate	4	Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, System.Security.Permissions.FileIOPermissionAccess.Read is required. If the file access is FileAccess.Write then System.Security.Permissions.FileIOPermissionAccess.Write is required. If the file is opened with FileAccess.ReadWrite, both System.Security.Permissions.FileIOPermissionAccess.Read and System.Security.Permissions.FileIOPermissionAccess.Write are required. If the file access is FileAccess.Append, then System.Security.Permissions.FileIOPermissionAccess.Append is required.
	Truncate	5	Specifies that the operating system should open an existing file. Once opened, the file should be truncated so that its size is zero bytes. This requires System.Security.Permissions.FileIOPermissionAccess.Write. Attempts to read from a file opened with Truncate cause an exception.
	Append	6	Opens the file if it exists and seeks to the end of the file, or creates a new file. FileMode.Append can only be used in conjunction with FileAccess.Write. Attempting to seek to a position before the end of the file will throw an System.IO.IOException and any attempt to read fails and throws an System.NotSupportedException.