[英]Execute dynamic query with Linq in Entity Framework
我有:
string table_name = "Orders";
string column_name = "Name";
string identity_column = "OrderID"
int identity_value = 5;
我如何(动态)实现以下目标:
var result = (from order in db.Orders
where order.OrderId== identity_value
select order).SingleOrDefault();
出于安全原因,我无法创建整个sql查询,然后将其执行到服务器。
`System.Linq.Dynamic` library will help you generating dynamic query which has extension method
Where(string predicate,params object[] values)
首先要使用此名称空间
using System.Linq.Dynamic;
然后在运行时构造谓词
string predicate = "OrderId = @0";
int identity_value = 5;
然后查询db.Orders
db.Orders.AsQueryable().Where(predicate,identity_value);
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