Class SubqueryAttribute

Data object subquery attribute

Inheritance
Object
Attribute
DataSourceAttribute
SubqueryAttribute
Inherited Members
Namespace: XData.Mapping
Assembly: XData.docfx.dll
Syntax
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
public sealed class SubqueryAttribute : DataSourceAttribute
Examples
    Subquery("A", typeof(DocSpecAmounts), "Amount", Grouping = DataGrouping.Sum)

Constructors

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SubqueryAttribute(String, Type, String)

Data object subquery attribute

Declaration
public SubqueryAttribute(string alias, Type subqueryType, string propertyName)
Parameters
Type Name Description
String alias

Subquery alias
Type subqueryType

Object type represents subquery structure
String propertyName

Subquery selected property
Exceptions
Type Condition
XDataRuntimeException

Subquery alias cannot be null or empty string
XDataRuntimeException

Object type represents subquery structure cannot be null
XDataRuntimeException

Subquery selected property cannot be null or empty string

Properties

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Alias

Subquery alias

Declaration
public override string Alias { get; protected set; }
Property Value
Type Description
String
Overrides
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Grouping

Subquery grouping mode

Declaration
public DataGrouping Grouping { get; set; }
Property Value
Type Description
DataGrouping
Remarks

Subquery selected property (see PropertyName) aggregate function

Grouping in subquery mast to be defined by GroupOrder

WARNING! Do not use properties inside grouped subqueries! Use ColumnAttribute instead!

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PropertyName

Subquery selected property

Declaration
public string PropertyName { get; }
Property Value
Type Description
String
Remarks

Only one property (or column) can be selected from subquery

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SubqueryType

Object type represents subquery structure

Declaration
public Type SubqueryType { get; }
Property Value
Type Description
Type
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Type

Data source type

Declaration
public override DataSourceType Type { get; }
Property Value
Type Description
DataSourceType Subquery
Overrides
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TypeId

When implemented in a derived class, gets a unique identifier for this Attribute.

Declaration
public override object TypeId { get; }
Property Value
Type Description
Object

An Object that is a unique identifier for the attribute.
Overrides

Extension Methods

See Also