如何在WCF數據服務中編寫'In'查詢？

Question

如何在 Ado.Net中寫入'In'查詢 WCF Data Services？我已經嘗試了下面的代碼。

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

但上述代碼不起作用。我得到以下錯誤。

測試 'MyTest的' 失敗：System.NotSupportedException：該 表達式（（[10007] .customerId = 空）和 值（System.Collections.Generic.List 1[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.DataServiceQuery 1.Execute（） 在System.Data.Services.Client.DataServiceQuery 1.GetEnumerator() at System.Collections.Generic.List 1..ctor（IEnumerable的源）

Answer 1

這可能會有幫助。

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

Answer 2

WCF數據服務 'WHERE IN'， 'WHERE NOT IN' 延伸方法sample