public static Expression <Func <T, bool> > LambdaExpressionBuilder <T>(this Expression expr1,
ParameterExpression parameterExpression, BinaryExpression expr2 = null,
BitwiseOperationExpressions bitwiseOperationExpressions = BitwiseOperationExpressions.AndAlso)
{
Expression binaryExpression = expr1.ChooseExpressionType(bitwiseOperationExpressions, expr2);
return(Expression.Lambda <Func <T, bool> >(binaryExpression, parameterExpression));
}
public static Expression GreaterLessThanBuilderExpressions(this MemberExpression leftExpression,
ExpressionDateTimeInfo leftExpr,
ExpressionDateTimeInfo rightExpr,
BitwiseOperationExpressions bitwiseOperationExpressions)
{
var greaterThanOrEqualBody = Expression.MakeBinary(leftExpr.ExpressionType.ConvertByName <ExpressionType>(),
leftExpression,
leftExpr.Constant);
if (rightExpr?.Constant == null)
{
return(greaterThanOrEqualBody);
}
var lessThanOrEqualBody = Expression.MakeBinary(rightExpr.ExpressionType.ConvertByName <ExpressionType>(),
leftExpression,
rightExpr.Constant);
return(greaterThanOrEqualBody.ChooseExpressionType(bitwiseOperationExpressions, lessThanOrEqualBody));
}
public static Expression ChooseExpressionType(this Expression expr1,
BitwiseOperationExpressions operationExpressions,
Expression expr2 = null)
{
Expression binaryExpression;
if (expr2 != null)
{
switch (operationExpressions)
{
case BitwiseOperationExpressions.And:
binaryExpression = Expression.And(expr1, expr2);
break;
case BitwiseOperationExpressions.Or:
binaryExpression = Expression.Or(expr1, expr2);
break;
case BitwiseOperationExpressions.AndAlso:
binaryExpression = Expression.AndAlso(expr1, expr2);
break;
case BitwiseOperationExpressions.OrElse:
binaryExpression = Expression.AndAlso(expr1, expr2);
break;
default:
throw new ArgumentOutOfRangeException(nameof(operationExpressions), operationExpressions, null);
}
}
else
{
binaryExpression = expr1;
}
return(binaryExpression);
}
