Question

How to write ‘In’ queries in Ado.Net WCF Data Services? I have tried the following code.

IList<int> orderIds = new List<int> { 59810, 59811, 59812, 59813, 59814 };
var lstorders = _context.Orders
                        .Where(o => orderIds.Contains(o.customerId))
                        .ToList<Orders>();

But the above code is not working. I am getting following error.

Test ‘MyTest’ failed: System.NotSupportedException : The
expression (([10007].customerId !=
null) And
value(System.Collections.Generic.List1[System.Int32]).Contains([10007].customerId.Value))
is not supported.
at System.Data.Services.Client.ExpressionWriter.ExpressionToString(DataServiceContext
context, Expression e)
at System.Data.Services.Client.UriWriter.VisitQueryOptionExpression(FilterQueryOptionExpression
fqoe)
at System.Data.Services.Client.UriWriter.VisitQueryOptions(ResourceExpression
re)
at System.Data.Services.Client.UriWriter.VisitResourceSetExpression(ResourceSetExpression
rse)
at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression
exp)
at System.Data.Services.Client.UriWriter.Translate(DataServiceContext
context, Boolean addTrailingParens,
Expression e, Uri& uri, Version&
version)
at System.Data.Services.Client.DataServiceQueryProvider.Translate(Expression
e)
at System.Data.Services.Client.DataServiceQuery1.Execute()
at System.Data.Services.Client.DataServiceQuery1.GetEnumerator()
at System.Collections.Generic.List1..ctor(IEnumerable1
collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable1
source)

Answer 1

This might help.

Select entities where ID in int array – WCF Data Services, LINQ