Class TypeSchemaNode

Information about a dataflow row schema, column schema, or column. The same TypeSchemaNode instance appears both as a node in the SchemaNodeRoot hierarchical tree (if populated at all), and in its SchemaNodeList flat list.

Note that column and schema members must be public.

Use one of the Create(Type) overloads to instantiate this class.

Also see Dataflow Columns.

Inheritance
Object
SchemaNode
TypeSchemaNode
Inherited Members
Namespace: actionETL
Assembly: actionETL.dll
Syntax
public class TypeSchemaNode : SchemaNode

Properties

Descendants

Gets all descendants of this instance, if any, in the SchemaNodeRoot hierarchical tree.

Declaration
public IEnumerable<TypeSchemaNode> Descendants { get; }
Property Value
Type Description
IEnumerable<TypeSchemaNode>

FieldOrPropertyType

Gets the member type if this instance corresponds to a field or property, or null if it corresponds to the row class.

To access other field or property specific details, first cast the MemberInfo to either FieldInfo or PropertyInfo, e.g.: var propertyInfo = memberInfo as PropertyInfo;

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

MemberInfo

Gets the member information if this instance corresponds to a field or property, or null if it corresponds to the row class.

To access field or property specific details, first cast the MemberInfo to either FieldInfo or PropertyInfo, e.g.: var propertyInfo = memberInfo as PropertyInfo;

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

SchemaType

Gets the type of the row schema, column schema, or column.

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

SchemaTypeDisplayName

Gets the schema type display name. See DisplayName(Type) for details.

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

SelfAndDescendants

Gets this instance itself, as well as all descendants of this instance, if any, in the SchemaNodeRoot hierarchical tree.

Declaration
public IEnumerable<TypeSchemaNode> SelfAndDescendants { get; }
Property Value
Type Description
IEnumerable<TypeSchemaNode>

TypeDetail

Information about if and how the type of the current node (e.g. a column or column schema) is supported in dataflows and how to copy the member, or TypeSchemaCopyPolicy.None if not set, and the estimated average memory usage in the dataflow. Also check CanRead and CanWrite to see if member can be read and written.

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

Methods

GetMemberAccessExpression(Expression)

Creates an expression tree expression that accesses the member for the current node from the root object, e.g. corresponding to Root.X.Y.ThisField. The root object can be the direct parent containing this instance, or any of its ancestors.

This is useful when generating expression tree code for accessing a field or property in the row, typically for getting or setting its value.

Declaration
public MemberExpression GetMemberAccessExpression(Expression rootObjectExpression)
Parameters
Type Name Description
Expression rootObjectExpression

The root object expression.
Returns
Type Description
MemberExpression

An expression for accessing the current node, usually used to get or set the field or property.
Exceptions
Type Condition
InvalidOperationException
  • Cannot be invoked on the row itself, but only on members of the row, or their descendants.
  • No .NET CLR Type information available.

ToString()

Returns a string that represents this instance.

Declaration
public override string ToString()
Returns
Type Description
String
Overrides

See Also

RowSchemaBase<TRowSchema, TSchemaNode>