Class UnionExpression
- Namespace
- Microsoft.EntityFrameworkCore.Query.SqlExpressions
- Assembly
- Microsoft.EntityFrameworkCore.Relational.dll
An expression that represents a UNION operation in a SQL tree.
This type is typically used by database providers (and other extensions). It is generally not used in application code.
public class UnionExpression : SetOperationBase, IPrintableExpression- Inheritance
-
UnionExpression
- Implements
-
IPrintableExpression
- Inherited Members
Constructors
UnionExpression(string, SelectExpression, SelectExpression, bool)
Creates a new instance of the UnionExpression class.
public UnionExpression(string alias, SelectExpression source1, SelectExpression source2, bool distinct)Parameters
aliasstringA string alias for the table source.
source1SelectExpressionA table source which is first source in the set operation.
source2SelectExpressionA table source which is second source in the set operation.
distinctboolA bool value indicating whether result will remove duplicate rows.
Methods
Equals(object)
public override bool Equals(object obj)Parameters
objobject
Returns
GetHashCode()
public override int GetHashCode()Returns
Print(ExpressionPrinter)
protected override void Print(ExpressionPrinter expressionPrinter)Parameters
expressionPrinterExpressionPrinter
Update(SelectExpression, SelectExpression)
Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.
public virtual UnionExpression Update(SelectExpression source1, SelectExpression source2)Parameters
source1SelectExpressionThe Source1 property of the result.
source2SelectExpressionThe Source2 property of the result.
Returns
- UnionExpression
This expression if no children changed, or an expression with the updated children.
VisitChildren(ExpressionVisitor)
protected override Expression VisitChildren(ExpressionVisitor visitor)Parameters
visitorExpressionVisitor