WF의 컬렉션 활동
컬렉션 활동은 워크플로에서 컬렉션 개체로 작업하는 데 사용됩니다. .NET Framework 4.6.1에는 컬렉션에서 항목을 추가 및 제거하고, 컬렉션에 항목이 있는지 테스트하고, 컬렉션을 지우는 시스템 제공 활동이 있습니다. ExistsInCollection 및 RemoveFromCollection은 결과를 나타내는 Boolean 형식의 OutArgument<T>가 있습니다.
Important
기본 컬렉션 개체를 설정하기 이전에 컬렉션 활동을 실행하면 InvalidOperationException이 throw되고 활동 오류가 발생합니다.
컬렉션 활동
| 활동 유형입니다. | 설명 |
|---|---|
| AddToCollection<T> | 지정한 컬렉션에 항목을 추가합니다. |
| ClearCollection<T> | 지정한 컬렉션에서 모든 항목을 지웁니다. |
| ExistsInCollection<T> | 항목이 컬렉션에 있으면 true를 반환합니다. |
| RemoveFromCollection<T> | 지정된 컬렉션에서 항목을 제거한 후 항목이 성공적으로 제거되면 true를 반환합니다. |
컬렉션 활동 사용
다음 코드 예제에서는 워크플로 변수로 선언된 컬렉션과 상호 작용하는 방법을 보여 줍니다. 사용된 컬렉션은 List<T>라는 String 개체의 fruitList입니다.
Variable<ICollection<string>> fruitList = new Variable<ICollection<string>>
{
Default = new VisualBasicValue<ICollection<string>>("New List(Of String) From {\"Apple\", \"Orange\"}"),
Name = "FruitList"
};
Variable<bool> result = new Variable<bool>
{
Name = "Result"
};
Activity wf = new Sequence
{
Variables = { fruitList, result },
Activities =
{
new If
{
Condition = new ExistsInCollection<string>
{
Collection = fruitList,
Item = "Pear"
},
Then = new AddToCollection<string>
{
Collection = fruitList,
Item = "Pear"
},
Else = new RemoveFromCollection<string>
{
Collection = fruitList,
Item = "Apple"
}
},
new RemoveFromCollection<string>
{
Collection = fruitList,
Item = "Apple",
Result = result
},
new If
{
Condition = result,
Then = new ClearCollection<string>
{
Collection = fruitList,
}
}
}
};
<Sequence
xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities"
xmlns:scg="clr-namespace:System.Collections.Generic;assembly=mscorlib"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Sequence.Variables>
<x:Reference>__ReferenceID0</x:Reference>
<x:Reference>__ReferenceID1</x:Reference>
</Sequence.Variables>
<If>
<If.Condition>
<InArgument
x:TypeArguments="x:Boolean">
<ExistsInCollection
x:TypeArguments="x:String"
Item="Pear">
<ExistsInCollection.Result>
<OutArgument
x:TypeArguments="x:Boolean" />
</ExistsInCollection.Result>
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
<VariableValue.Variable>
<Variable
x:TypeArguments="scg:ICollection(x:String)"
x:Name="__ReferenceID0"
Default="[New List(Of String) From {"Apple", "Orange"}]"
Name="FruitList" />
</VariableValue.Variable>
</VariableValue>
</InArgument>
</ExistsInCollection>
</InArgument>
</If.Condition>
<If.Then>
<AddToCollection
x:TypeArguments="x:String"
Item="Pear">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</AddToCollection>
</If.Then>
<If.Else>
<RemoveFromCollection
x:TypeArguments="x:String"
Item="Apple"
Result="{x:Null}">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</RemoveFromCollection>
</If.Else>
</If>
<RemoveFromCollection
x:TypeArguments="x:String"
Item="Apple">
<RemoveFromCollection.Result>
<OutArgument
x:TypeArguments="x:Boolean">
<VariableReference
x:TypeArguments="x:Boolean">
<VariableReference.Result>
<OutArgument
x:TypeArguments="Location(x:Boolean)" />
</VariableReference.Result>
<VariableReference.Variable>
<Variable
x:TypeArguments="x:Boolean"
x:Name="__ReferenceID1"
Name="Result" />
</VariableReference.Variable>
</VariableReference>
</OutArgument>
</RemoveFromCollection.Result>
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</RemoveFromCollection>
<If>
<If.Condition>
<InArgument
x:TypeArguments="x:Boolean">
<VariableValue
x:TypeArguments="x:Boolean"
Variable="{x:Reference __ReferenceID1}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="x:Boolean" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</If.Condition>
<If.Then>
<ClearCollection
x:TypeArguments="x:String">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</ClearCollection>
</If.Then>
</If>
</Sequence>
위의 코드 샘플에서 CSharpValue<TResult> 대신 VisualBasicValue<TResult>을 사용하여 식을 만들 수도 있습니다.
Variable<ICollection<string>> fruitList = new Variable<ICollection<string>>
{
Default = new CSharpValue<ICollection<string>>("new List<String> From {\"Apple\", \"Orange\"};"),
Name = "FruitList"
};
Variable<bool> result = new Variable<bool>
{
Name = "Result"
};
Activity wf = new Sequence
{
Variables = { fruitList, result },
Activities =
{
new If
{
Condition = new ExistsInCollection<string>
{
Collection = fruitList,
Item = "Pear"
},
Then = new AddToCollection<string>
{
Collection = fruitList,
Item = "Pear"
},
Else = new RemoveFromCollection<string>
{
Collection = fruitList,
Item = "Apple"
}
},
new RemoveFromCollection<string>
{
Collection = fruitList,
Item = "Apple",
Result = result
},
new If
{
Condition = result,
Then = new ClearCollection<string>
{
Collection = fruitList,
}
}
}
};
<Sequence
xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities"
xmlns:scg="clr-namespace:System.Collections.Generic;assembly=mscorlib"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Sequence.Variables>
<x:Reference>__ReferenceID0</x:Reference>
<x:Reference>__ReferenceID1</x:Reference>
</Sequence.Variables>
<If>
<If.Condition>
<InArgument
x:TypeArguments="x:Boolean">
<ExistsInCollection
x:TypeArguments="x:String"
Item="Pear">
<ExistsInCollection.Result>
<OutArgument
x:TypeArguments="x:Boolean" />
</ExistsInCollection.Result>
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
<VariableValue.Variable>
<Variable
x:TypeArguments="scg:ICollection(x:String)"
x:Name="__ReferenceID0"
Default="[new List<String> From {"Apple", "Orange"};]"
Name="FruitList" />
</VariableValue.Variable>
</VariableValue>
</InArgument>
</ExistsInCollection>
</InArgument>
</If.Condition>
<If.Then>
<AddToCollection
x:TypeArguments="x:String"
Item="Pear">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</AddToCollection>
</If.Then>
<If.Else>
<RemoveFromCollection
x:TypeArguments="x:String"
Item="Apple"
Result="{x:Null}">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</RemoveFromCollection>
</If.Else>
</If>
<RemoveFromCollection
x:TypeArguments="x:String"
Item="Apple">
<RemoveFromCollection.Result>
<OutArgument
x:TypeArguments="x:Boolean">
<VariableReference
x:TypeArguments="x:Boolean">
<VariableReference.Result>
<OutArgument
x:TypeArguments="Location(x:Boolean)" />
</VariableReference.Result>
<VariableReference.Variable>
<Variable
x:TypeArguments="x:Boolean"
x:Name="__ReferenceID1"
Name="Result" />
</VariableReference.Variable>
</VariableReference>
</OutArgument>
</RemoveFromCollection.Result>
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</RemoveFromCollection>
<If>
<If.Condition>
<InArgument
x:TypeArguments="x:Boolean">
<VariableValue
x:TypeArguments="x:Boolean"
Variable="{x:Reference __ReferenceID1}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="x:Boolean" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</If.Condition>
<If.Then>
<ClearCollection
x:TypeArguments="x:String">
<InArgument
x:TypeArguments="scg:ICollection(x:String)">
<VariableValue
x:TypeArguments="scg:ICollection(x:String)"
Variable="{x:Reference __ReferenceID0}">
<VariableValue.Result>
<OutArgument
x:TypeArguments="scg:ICollection(x:String)" />
</VariableValue.Result>
</VariableValue>
</InArgument>
</ClearCollection>
</If.Then>
</If>
</Sequence>
참고 항목
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