protected override Expression VisitUnary(UnaryExpression unaryExpression)
{
if (unaryExpression.NodeType == ExpressionType.ArrayLength &&
unaryExpression.Operand.Type == typeof(byte[]))
{
var sqlExpression = base.Visit(unaryExpression.Operand) as SqlExpression;
if (sqlExpression == null)
{
return(null);
}
var isBinaryMaxDataType = GetProviderType(sqlExpression) == "varbinary(max)" || sqlExpression is SqlParameterExpression;
var dataLengthSqlFunction = SqlExpressionFactory.Function(
"DATALENGTH",
new[] { sqlExpression },
nullable: true,
argumentsPropagateNullability: new bool[] { true },
isBinaryMaxDataType ? typeof(long) : typeof(int));
return(isBinaryMaxDataType
? (Expression)SqlExpressionFactory.Convert(dataLengthSqlFunction, typeof(int))
: dataLengthSqlFunction);
}
return(base.VisitUnary(unaryExpression));
}
public SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType, IDiagnosticsLogger <DbLoggerCategory.Query> logger) =>
instance.Type != ClrType
? null
: SqlExpressionFactory.Convert(instance, returnType);
