Class SelectExpression

Namespace

NextORM.Core

Assembly

nextorm.core.dll

A single projected column of a query: its ordinal, the expression that produces it, the target property it maps to and the reader accessor used to materialize it.

[SuppressMessage("Style", "IDE1006:Naming Styles", Justification = "Static readonly reflection-metadata fields (GetInt32MI, ...) are intentionally PascalCase as immutable lookup tables; IDE1006 is a suggestion and is not enforced by the build.")]
public sealed class SelectExpression

Inheritance

object

SelectExpression

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Extension Methods

EntityBuilderExtensions.AsEntityBuilder<T>(object?)

Constructors

SelectExpression(Type)

Initializes a projected column for the given CLR type, deriving its nullability from the type.

public SelectExpression(Type propertyType)

Parameters

propertyType Type

The CLR type of the value produced.

Fields

Nullable

Whether the CLR type can hold null (a reference type or a Nullable<T>).

public readonly bool Nullable

Field Value

bool

Properties

Converter

The value converter applied to this column after reading and before materialization, or null when the column is read as-is.

public IPropertyValueConverter? Converter { get; set; }

Property Value

IPropertyValueConverter

DefaultOnNull

True when a SQL NULL in this column means "no row" (the projection came from a *OrDefault scalar terminal) and the column is a non-nullable value type, so the reader must substitute default instead of throwing. Set while the projection is prepared; read by the provider's column mapper.

public bool DefaultOnNull { get; }

Property Value

bool

DurationPrecision

The fractional-second precision of a native duration type, or zero for the provider default.

public int DurationPrecision { get; set; }

Property Value

int

DurationUnit

The declared storage unit of a TimeSpan column on a provider without a native duration type, or null for a native column. Populated from the entity property metadata; the provider's column mapper decides whether it applies (see SupportsNativeDuration).

public DurationUnit? DurationUnit { get; set; }

Property Value

DurationUnit?

Expression

The expression that produces the value, or null for a plain entity column.

public Expression? Expression { get; set; }

Property Value

Expression

Index

The zero-based ordinal of the column in the result set.

public int Index { get; set; }

Property Value

int

PropertyName

The target property name, or null for a positional projection.

public string? PropertyName { get; set; }

Property Value

string

PropertyType

The CLR type of the value produced.

public Type PropertyType { get; set; }

Property Value

Type

ProviderType

The provider-side type Converter produces and reads, or null when the property is read as its CLR type. The reader selects its typed accessor from this type rather than PropertyType.

public Type? ProviderType { get; set; }

Property Value

Type

Methods

GetDataRecordMethod()

Gets the reader accessor that reads a value of this column's type from a data record.

public MethodInfo GetDataRecordMethod()

Returns

MethodInfo

The MethodInfo of the matching IDataRecord getter.