C# Linq查询问题
我有一个linq查询，它将CustomerRecord表中的数据显示为。现在我对发票号和交易日期的数据进行分组，并按照交易日期的降序排列数据。这是我用来实现这一点的以下查询C# Linq查询问题,c#,asp.net,linq-to-sql,C#,Asp.net,Linq To Sql,我有一个linq查询，它将CustomerRecord表中的数据显示为。现在我对发票号和交易日期的数据进行分组，并按照交易日期的降序排列数据。这是我用来实现这一点的以下查询 (from result in db.CustomersRecords orderby result.Date_Of_Transaction.Value descending group result
(from result in db.CustomersRecords
orderby result.Date_Of_Transaction.Value descending
group result
by new { result.Invoice_Number, result.Date_Of_Transaction } into intermediateResult
select new { InvoiceNumber = intermediateResult.Key.Invoice_Number, DateOfTransaction = intermediateResult.Key.Date_Of_Transaction, TotalAmount = intermediateResult.Sum(result => result.Total_Amount) }).ToList();
我不明白里面发生了什么。完成分组后，将订单移动到
(from result in db.CustomersRecords
group result
by new { result.Invoice_Number, result.Date_Of_Transaction } into intermediateResult
orderby intermediateResult.Key.Date_Of_Transaction descending
select new { InvoiceNumber = intermediateResult.Key.Invoice_Number, DateOfTransaction = intermediateResult.Key.Date_Of_Transaction, TotalAmount = intermediateResult.Sum(result => result.Total_Amount) }).ToList();
之所以如此，是因为group by result.Invoice_编号覆盖了以前的order by。由于发票编号通常以日期顺序给出，因此它似乎是以日期升序的形式给出的。在分组后将订单移动到
(from result in db.CustomersRecords
group result
by new { result.Invoice_Number, result.Date_Of_Transaction } into intermediateResult
orderby intermediateResult.Key.Date_Of_Transaction descending
select new { InvoiceNumber = intermediateResult.Key.Invoice_Number, DateOfTransaction = intermediateResult.Key.Date_Of_Transaction, TotalAmount = intermediateResult.Sum(result => result.Total_Amount) }).ToList();
之所以如此，是因为group by result.Invoice_编号覆盖了以前的order by。由于发票号通常以日期顺序给出，因此它似乎是以日期升序的形式给出的。当我按照指定移动orderby时，我无法获得intermediateResult.Date\u Of\u事务（我的意思是intellisense没有帮我做这件事）。即使我强制键入“'System.Linq.IGrouping'不包含'Date\u Of_Transaction'的定义，并且找不到接受'System.Linq.IGrouping'类型的第一个参数的扩展方法'Date\u Of_Transaction'（您是否缺少using指令或程序集引用？）.这是我的错误，帮帮我out@user653622很抱歉，你需要添加
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