/// <summary>
/// Translates the <paramref name="unaryExpression"/> into a string representation.
/// </summary>
/// <param name="unaryExpression">The <see cref="DbUnaryExpression"/> to translate.</param>
/// <returns><see cref="string"/></returns>
protected override DbExpression VisitUnaryExpression(DbUnaryExpression unaryExpression)
{
string syntax;
switch (unaryExpression.UnaryExpressionType)
{
case DbUnaryExpressionType.Not:
syntax = string.Format("NOT {0}", Visit(unaryExpression.Operand));
break;
case DbUnaryExpressionType.Cast:
syntax = string.Format("CAST({0} AS {1})",
Visit(unaryExpression.Operand),
GetCastFunctionBody(unaryExpression.TargetType));
break;
default:
throw new ArgumentOutOfRangeException("unaryExpression",
string.Format(
"The UnaryExpressionType '{0}' is not supported",
unaryExpression.UnaryExpressionType));
}
return(ExpressionFactory.Sql(syntax));
}
/// <summary>
/// Translates the <paramref name="unaryExpression"/> into a string representation.
/// </summary>
/// <param name="unaryExpression">The <see cref="DbUnaryExpression"/> to translate.</param>
/// <returns><see cref="DbExpression"/></returns>
protected virtual DbExpression VisitUnaryExpression(DbUnaryExpression unaryExpression)
{
var operandExpression = Visit(unaryExpression.Operand);
if (!ReferenceEquals(operandExpression, unaryExpression.Operand))
{
return(ExpressionFactory.MakeUnary(unaryExpression.UnaryExpressionType, operandExpression,
unaryExpression.TargetType));
}
return(unaryExpression);
}
/// <summary>
/// Creates a new <see cref="DbUnaryExpression"/>.
/// </summary>
/// <param name="unaryExpressionType">The <see cref="DbUnaryExpressionType"/> that specifies the type of unary expression to create.</param>
/// <param name="operand">The <see cref="DbExpression"/> that represents the unary operand.</param>
/// <param name="targetType">The <see cref="Type"/> that specifies the type to convert to.</param>
/// <returns>A <see cref="DbUnaryExpression"/> instance.</returns>
public DbUnaryExpression MakeUnary(DbUnaryExpressionType unaryExpressionType, DbExpression operand, Type targetType)
{
var unaryExpression = new DbUnaryExpression(unaryExpressionType, operand, targetType);
return unaryExpression;
}
/// <summary>
/// Translates the <paramref name="unaryExpression"/> into a string representation.
/// </summary>
/// <param name="unaryExpression">The <see cref="DbUnaryExpression"/> to translate.</param>
/// <returns><see cref="string"/></returns>
protected override DbExpression VisitUnaryExpression(DbUnaryExpression unaryExpression)
{
string syntax;
switch (unaryExpression.UnaryExpressionType)
{
case DbUnaryExpressionType.Not:
syntax = string.Format("NOT {0}", Visit(unaryExpression.Operand));
break;
case DbUnaryExpressionType.Cast:
syntax = string.Format("CAST({0} AS {1})",
Visit(unaryExpression.Operand),
GetCastFunctionBody(unaryExpression.TargetType));
break;
default:
throw new ArgumentOutOfRangeException("unaryExpression",
string.Format(
"The UnaryExpressionType '{0}' is not supported",
unaryExpression.UnaryExpressionType));
}
return ExpressionFactory.Sql(syntax);
}
/// <summary>
/// Translates the <paramref name="unaryExpression"/> into a string representation.
/// </summary>
/// <param name="unaryExpression">The <see cref="DbUnaryExpression"/> to translate.</param>
/// <returns><see cref="DbExpression"/></returns>
protected virtual DbExpression VisitUnaryExpression(DbUnaryExpression unaryExpression)
{
var operandExpression = Visit(unaryExpression.Operand);
if (!ReferenceEquals(operandExpression, unaryExpression.Operand))
return ExpressionFactory.MakeUnary(unaryExpression.UnaryExpressionType, operandExpression,
unaryExpression.TargetType);
return unaryExpression;
}
