PrecedenceConstraint 类

Specifies the properties for configuring a precedence constraint between two containers. This class cannot be inherited.

继承层次结构

System. . :: . .Object
  Microsoft.SqlServer.Dts.Runtime. . :: . .DtsObject
    Microsoft.SqlServer.Dts.Runtime..::..PrecedenceConstraint

命名空间：  Microsoft.SqlServer.Dts.Runtime
程序集：  Microsoft.SqlServer.ManagedDTS（在 Microsoft.SqlServer.ManagedDTS.dll 中）

语法

声明
Public NotInheritable Class PrecedenceConstraint _
    Inherits DtsObject _
    Implements IDTSName, IDTSPersist, IComponent, IDisposable
用法
Dim instance As PrecedenceConstraint

public sealed class PrecedenceConstraint : DtsObject, 
    IDTSName, IDTSPersist, IComponent, IDisposable

public ref class PrecedenceConstraint sealed : public DtsObject, 
    IDTSName, IDTSPersist, IComponent, IDisposable

[<SealedAttribute>]
type PrecedenceConstraint =  
    class
        inherit DtsObject
        interface IDTSName
        interface IDTSPersist
        interface IComponent
        interface IDisposable
    end

public final class PrecedenceConstraint extends DtsObject implements IDTSName, IDTSPersist, IComponent, IDisposable

PrecedenceConstraint 类型公开以下成员。

属性

	名称	说明
	ConstrainedExecutable	Returns the name of a constrained container. This property is read-only.
	CreationName	Returns the string used by the Integration Services runtime to create an instance of the PrecedenceConstraint object and add the object to the PrecedenceConstraints collection. This property is read-only.
	Description	Gets or sets a description for the constraint.
	EvalOp	Gets or sets the evaluation operations used by the precedence constraint.
	EvaluatesTrue	Returns the Boolean value of the Value property. This property is read-only.
	Expression	Gets or sets the expression that the precedence constraint uses if EvalOp is set to Expression, ExpressionAndConstraint, or ExpressionOrConstraint.
	ID	Returns the GUID of the precedence constraint. This property is read-only.
	LogicalAnd	Gets or sets a Boolean that indicates whether multiple constraints work together.
	Name	Gets or sets the unique name of the precedence constraint.
	PrecedenceExecutable	Returns the name of the precedence executable. This property is read-only.
	Site	基础结构。
	Value	Gets or sets the constraint type of Success, Failure, or Completion.

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方法

	名称	说明
	Dispose	This method is inherited from the IDisposable.Dispose method, which is a generic mechanism to explicitly tell an object to perform cleanup.
	Equals	Determines whether two object instances are equal. （从 DtsObject 继承。）
	Finalize	（从 Object 继承。）
	GetHashCode	Returns the hash code for this instance. （从 DtsObject 继承。）
	GetType	（从 Object 继承。）
	LoadFromXML	This method is not callable by your application code. To load a package containing precedence constraints that are saved as .xml, use the Application..::..LoadPackage method.
	MemberwiseClone	（从 Object 继承。）
	SaveToXML	This method is not callable by your application code. To save a package as .xml, use the Application..::..SaveToXml method.
	ToString	（从 Object 继承。）

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事件

	名称	说明
	Disposed	Adds an event handler to listen to the Disposed event on the precedence constraint.

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注释

You can specify the precedence and constrained executables that the precedence constraint connects, the expression and constraint that determine whether the constrained executable runs, and whether the precedence constraint works in concert with other precedence constraints.

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.Dts.Runtime 命名空间