Class Condition

Namespace

DynaSharp

Assembly

DynaSharp.dll

A condition that can be kept in a field, assembled at run time and combined with &, | and !: Condition.Of(Attr("status").Eq("open")).

public abstract class Condition : ICondition

Inheritance

object

Condition

Implements

ICondition

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Extension Methods

ConditionExtensions.And<TLeft, TRight>(TLeft, TRight)

ConditionExtensions.Negate<TInner>(TInner)

ConditionExtensions.Or<TLeft, TRight>(TLeft, TRight)

Remarks

When to use it. The conditions that Attr and the generated Attrs make are structs whose type changes with every .And(), .Or() and .Negate(), which is awkward for a field or a condition built in a loop. Of<T>(T) wraps one in this type, whose type stays the same.

Operators. a.Eq(1) & b.Gt(2) does not compile on two structs: &, | and ! need a Condition on one side, and the struct on the other side converts, as in .If(Open & Attr("version").Eq(v)). Instances are immutable, so one can be shared between threads and commands.

Methods

Of<T>(T)

Wraps a condition in a Condition object, so it can be kept in a field, assembled at run time or combined with &, | and !.

public static Condition Of<T>(T condition) where T : ICondition

Parameters

condition T

The struct condition.

Returns

Condition

The condition, in one object.

Type Parameters

T

The type of the condition.

Render(ref ExpressionSink)

Writes the condition as expression text. Attribute names and values go through Path(string) and DynaSharp.Expressions.ExpressionSink.Value<T, TConverter>(T), which turn them into placeholders.

public abstract void Render(ref ExpressionSink sink)

Parameters

sink ExpressionSink

Where the text goes.

Operators

operator &(Condition, Condition)

Makes a condition that holds when both hold.

public static Condition operator &(Condition left, Condition right)

Parameters

left Condition

The first condition.

right Condition

The second condition.

Returns

Condition

The condition.

operator |(Condition, Condition)

Makes a condition that holds when either holds.

public static Condition operator |(Condition left, Condition right)

Parameters

left Condition

The first condition.

right Condition

The second condition.

Returns

Condition

The condition.

operator !(Condition)

Makes a condition that holds when another one does not.

public static Condition operator !(Condition condition)

Parameters

condition Condition

The other condition.

Returns

Condition

The opposite.