RuleValue Class

项目
12/15/2008

Represents an Argument that obtains its value from the evaluation of other RuleLogic instances.

命名空间: Microsoft.SqlServer.NotificationServices.Rules
程序集: Microsoft.SqlServer.NotificationServices.Rules (in microsoft.sqlserver.notificationservices.rules.dll)

语法

声明
Public Class RuleValue
    Inherits Argument

public class RuleValue : Argument

public ref class RuleValue : public Argument

public class RuleValue extends Argument

public class RuleValue extends Argument

备注

The RuleValue class allows you to use the result of other rule evaluations as a value in a rule.

You must provide a rule in the RuleValue(RuleLogic) constructor or using the Rule property; this rule must have the same InputType value as the rule or condition you are defining.

A RuleLogic instance of type FilterRule has a Boolean return value; an instance of type PropertyRule has a return type determined by the Result property.

Inheritance Hierarchy

System.Object
   Microsoft.SqlServer.NotificationServices.Rules.RuleObject
     Microsoft.SqlServer.NotificationServices.Rules.Argument
      Microsoft.SqlServer.NotificationServices.Rules.RuleValue

示例

The following example shows how to use a rule value to obtain the logic for a SimpleLeafCondition from a PropertyRule. The SimpleLeafCondition to evaluate the Quantity field for a value that matches the definition of Few:

// Define a new property that defines "Few," "Some," and "Alot"
// of inventory. 
PropertyRule quantityCategory = new PropertyRule(
    new ViewInputType(eventView),
    new PropertyStatement(new SimpleLeafCondition(
        new FieldValue("Quantity"),
        SimpleOperator.LessThan, 100), "Few"),
    new PropertyStatement(new BetweenLeafCondition(
        new FieldValue("Quantity"), 100, 200), "Some"),
    new PropertyStatement(new SimpleLeafCondition(
            new FieldValue("Quantity"),
            SimpleOperator.GreaterThan, 200),
        "Alot"));

// Create subscription and define basic properties.
s = new Subscription(nsApplication, subscriptionClassName);
s.SubscriberId = "Scott";
s.Enabled = true;
s.RuleName = "InventoryTrackerRule";
s.SetFieldValue("DeviceName", "myDevice");
s.SetFieldValue("SubscriberLocale", "en-us");


// Use the new property to return only products with "few" remaining
// in inventory. Note that the category definition can be reused.
s.Condition = new SimpleLeafCondition(
    new RuleValue(quantityCategory),
    SimpleOperator.Equals,
    "Few");

// Add subscription.
s.Add();

线程安全

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

平台

开发平台

有关支持的平台列表，请参阅安装 SQL Server 2005 的硬件和软件要求。

目标平台