摘要： 本示例使用的数据库为Northwind经测试全部运行正确；后台代码如下：Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using (var edm =new NorthwindEntities()) 2 { 3 //1.请查询Customer 的CustomerID = “ALFKI” 所拥有的Order 数量 4 //string esql = @"select COUNT(0) as count from Orders 阅读全文