DataFile 类

The DataFile object represents a SQL Server data file.

继承层次结构

System.Object
  Microsoft.SqlServer.Management.Smo.SmoObjectBase
    Microsoft.SqlServer.Management.Smo.SqlSmoObject
      Microsoft.SqlServer.Management.Smo.NamedSmoObject
        Microsoft.SqlServer.Management.Smo.DatabaseFile
          Microsoft.SqlServer.Management.Smo.DataFile

命名空间：  Microsoft.SqlServer.Management.Smo
程序集：  Microsoft.SqlServer.Smo（在 Microsoft.SqlServer.Smo.dll 中）

语法

声明
<PhysicalFacetAttribute> _
<SfcElementTypeAttribute("File")> _
<EvaluationModeAttribute(AutomatedPolicyEvaluationMode.CheckOnSchedule)> _
Public NotInheritable Class DataFile _
    Inherits DatabaseFile _
    Implements ICreatable, ISfcSupportsDesignMode
用法
Dim instance As DataFile

[PhysicalFacetAttribute]
[SfcElementTypeAttribute("File")]
[EvaluationModeAttribute(AutomatedPolicyEvaluationMode.CheckOnSchedule)]
public sealed class DataFile : DatabaseFile, 
    ICreatable, ISfcSupportsDesignMode

[PhysicalFacetAttribute]
[SfcElementTypeAttribute(L"File")]
[EvaluationModeAttribute(AutomatedPolicyEvaluationMode::CheckOnSchedule)]
public ref class DataFile sealed : public DatabaseFile, 
    ICreatable, ISfcSupportsDesignMode

[<SealedAttribute>]
[<PhysicalFacetAttribute>]
[<SfcElementTypeAttribute("File")>]
[<EvaluationModeAttribute(AutomatedPolicyEvaluationMode.CheckOnSchedule)>]
type DataFile =  
    class 
        inherit DatabaseFile 
        interface ICreatable 
        interface ISfcSupportsDesignMode 
    end

public final class DataFile extends DatabaseFile implements ICreatable, ISfcSupportsDesignMode

DataFile 类型公开以下成员。

构造函数

	名称	说明
	DataFile()	Initializes a new instance of the DataFile class.
	DataFile(FileGroup, String)	Initializes a new instance of the DataFile class on the specified file group with the specified name.
	DataFile(FileGroup, String, String)	Initializes a new instance of the DataFile class on the specified file group with the specified name and file name.

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属性

	名称	说明
	AvailableSpace	Gets the amount of available space in the data file in KB.
	BytesReadFromDisk	Gets the number of bytes read from disk.
	BytesWrittenToDisk	Gets the number of bytes written to disk.
	FileName	Gets or sets the data file name.
	Growth	Gets or sets the growth increment for the data file in KB or percent.
	GrowthType	Gets or sets the growth type for the data file in kilobytes or percent.
	ID	Gets the ID value that uniquely identifies the data file.
	IsOffline	Gets the Boolean property value that specifies whether the data file is offline or not.
	IsPrimaryFile	Gets the Boolean property value that specifies whether the data file is the primary file of the database.
	IsReadOnly	Gets the Boolean property value that specifies whether the data file is read-only or can be updated.
	IsReadOnlyMedia	Gets the Boolean property value that specifies whether the data file is stored on read-only media.
	IsSparse	Gets the Boolean value that specifies whether the file is a sparse file. Sparse files are used in database snapshots.
	MaxSize	Gets or set the maximum size to which the data file can grow in KB.
	Name	Gets or sets the name of the object. （从 NamedSmoObject 继承。）
	NumberOfDiskReads	Gets the number of disk reads.
	NumberOfDiskWrites	Gets the number of disk writes.
	Parent	Gets or sets the FileGroup object that is the parent of the DataFile object.
	Properties	Gets a collection of Property objects that represent the object properties. （从 SqlSmoObject 继承。）
	Size	Gets or sets the current size of the data file in KB.
	State	Gets the state of the referenced object. （从 SmoObjectBase 继承。）
	Urn	Gets the Uniform Resource Name (URN) address value that uniquely identifies the object. （从 SqlSmoObject 继承。）
	UsedSpace	Gets the amount of used space in the data file in KB.
	UserData	Gets or sets user-defined data associated with the referenced object. （从 SmoObjectBase 继承。）
	VolumeFreeSpace	Gets the volume free space in bytes.

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方法

	名称	说明
	Alter	Updates any property changes to the object to the instance of Microsoft SQL Server. （从 DatabaseFile 继承。）
	Create	Creates a data file on the instance of SQL Server as defined by the DataFile object.
	Discover	Discovers a list of type Object. （从 SqlSmoObject 继承。）
	Drop	Drops a database file. （从 DatabaseFile 继承。）
	Equals	（从 Object 继承。）
	FormatSqlVariant	Formats an object as SqlVariant type. （从 SqlSmoObject 继承。）
	GetContextDB	Gets the context database that is associated with this object. （从 SqlSmoObject 继承。）
	GetDBName	Gets the database name that is associated with the object. （从 SqlSmoObject 继承。）
	GetHashCode	（从 Object 继承。）
	GetPropValue	Gets a property value of the SqlSmoObject object. （从 SqlSmoObject 继承。）
	GetPropValueOptional	Gets a property value of the SqlSmoObject object. （从 SqlSmoObject 继承。）
	GetPropValueOptionalAllowNull	Gets a property value of the SqlSmoObject object. （从 SqlSmoObject 继承。）
	GetServerObject	Gets the server of the SqlSmoObject object. （从 SqlSmoObject 继承。）
	GetType	（从 Object 继承。）
	Initialize()	Initializes the object and forces the properties be loaded. （从 SqlSmoObject 继承。）
	Initialize(Boolean)	Initializes the object and forces the properties be loaded. （从 SqlSmoObject 继承。）
	IsObjectInitialized	Verifies whether the object has been initialized. （从 SqlSmoObject 继承。）
	IsObjectInSpace	Verifies whether the object is isolated or connected to the instance of SQL Server. （从 SqlSmoObject 继承。）
	MarkForDrop	Marks the database file to be dropped next time its parent object is altered by the Alter method. （从 DatabaseFile 继承。）
	Refresh	Refreshes the object and retrieves properties when the object is next accessed. （从 SqlSmoObject 继承。）
	Rename	Renames a database file. （从 DatabaseFile 继承。）
	SetOffline	Sets the database file status to offline.
	SetParentImpl	Sets the parent of the SqlSmoObject to the newParent parameter. （从 SqlSmoObject 继承。）
	Shrink	Shrinks a database file. （从 DatabaseFile 继承。）
	ToString	Returns a String that represents the referenced object. （从 SqlSmoObject 继承。）
	Validate	Validates the state of an object. （从 SmoObjectBase 继承。）

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事件

	名称	说明
	PropertyChanged	Represents the event that occurs when a property is changed. （从 SqlSmoObject 继承。）
	PropertyMetadataChanged	Represents the event that occurs when property metadata changes. （从 SqlSmoObject 继承。）

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显式接口实现

	名称	说明
	IAlienObject.Discover	Discovers any dependencies. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.GetDomainRoot	Returns the root of the domain. （从 SqlSmoObject 继承。）
	IAlienObject.GetParent	Gets the parent of this object. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.GetPropertyType	Gets the type of the specified property. （从 SqlSmoObject 继承。）
	IAlienObject.GetPropertyValue	Gets the value of the specified property. （从 SqlSmoObject 继承。）
	IAlienObject.GetUrn	Gets the Unified Resource Name (URN) of the object. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.Resolve	Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. （从 SqlSmoObject 继承。）
	IAlienObject.SetObjectState	Sets the object state to the specified SfcObjectState value. （从 SqlSmoObject 继承。）
	IAlienObject.SetPropertyValue	Sets the property value. （从 SqlSmoObject 继承。）
	ISfcPropertyProvider.GetPropertySet	Gets the interface reference to the set of properties of this object. （从 SqlSmoObject 继承。）
	ISfcSupportsDesignMode.IsDesignMode	Gets a Boolean value that indicates whether the object supports design mode.

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注释

To get the DataFile object properties, users can be a member of the public fixed server role.

To set the DataFile object properties, users must have ALTER permission on the database or be a member of the db_owner fixed database role.

To create a data file, users must have ALTER permission on the database or be a member of the db_owner fixed database role.

To drop a data file, users must have ALTER permission on the database or be a member of the db_owner fixed database role.

Thread Safety

此类型的任何公共静态（Microsoft Visual Basic 中的 Shared）成员在多线程操作中是安全的。但不保证所有实例成员都是线程安全的。

示例

使用文件组和文件存储数据

线程安全

此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。不保证所有实例成员都是线程安全的。

请参阅

参考

Microsoft.SqlServer.Management.Smo 命名空间

其他资源

文件和文件组体系结构

CREATE DATABASE (Transact-SQL)