LINQ: There is already an open DataReader associated with this Command which must be closed first
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在Linq to SQL和Entity Framework，使用Linq查询数据的时候会出现错误：There is already an open DataReader associated with this Command which must be closed first 。
解决方案：
在数据库连接串上添加MultipleActiveResultSets=true。
Fixing the "There is already an open DataReader associated with this Command which must be closed first." exception in Entity Framework
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