Question

我正在尝试使用以下LINQ查询来对数据库（3.5 SP1）起作用：

var labelIds = new List<int> { 1, 2 };
var customersAggregatedTransactionsByType =
    (from transactions in context.TransactionSet
    from customers in context.CustomerSet
        .Where(LinqTools.BuildContainsExpression<Billing.Customer, int>(u => u.LabelId, labelIds))
    from accounts in context.AccountSet
    where customers == accounts.Customer
        && accounts.Id == transactions.Account.Id
        && transactions.DateTime >= fromDate && transactions.DateTime < toDate
    group transactions.Amount
    by new
    {
        UserAccountId = transactions.Account.Id,
        TransactionTypeId = transactions.TransactionTypeId,
        BaseAssetId = accounts.BaseAssetId
    } into customerTransactions
    select customerTransactions).ToList();

添加Where(LinqTools.BuildContainsExpression<Billing.Customer, int>(u => u.LabelId, labelIds))后，我收到以下异常：

System.InvalidOperationException：内部.NET Framework数据提供程序错误1025.

如果我删除Where(LinqTools.BuildContainsExpression<Billing.Customer, int>(u => u.LabelId, labelIds))一切都好。

任何帮助将不胜感激。

谢谢，Nir。

Answer 1

尝试：

        var labelIds = new List<int> { 1, 2 };
        var exp = LinqTools.BuildContainsExpression<Billing.Customer, int>(u => u.LabelId, labelIds);
        var customersAggregatedTransactionsByType =
             (from transactions in context.TransactionSet
              from customers in context.CustomerSet.Where(exp)
              from accounts in context.AccountSet
              where customers == accounts.Customer
                 && accounts.Id == transactions.Account.Id
                 && transactions.DateTime >= fromDate && transactions.DateTime < toDate
              group transactions.Amount
              by new
              {
                  UserAccountId = transactions.Account.Id,
                  TransactionTypeId = transactions.TransactionTypeId,
                  BaseAssetId = accounts.BaseAssetId
              } into customerTransactions
              select customerTransactions).ToList();

您希望查询中包含结果，而不是LinqTools.BuildContainsExpression本身的调用。

实体框架BuildContainsExpression导致内部.NET Framework数据提供程序错误1025

1 个答案: