关于 The SqlParameter is already contained by another SqlParameterCollection 报错的解决方案

在使用ef中
由于使用sql语句查询分页,但还需要查出数据数,所以大部分是发生在这种情况下

这个时候因为在数据库命令对象中的参数集合没有释放,再去使用该集合,就会报错(我感觉是这样)
解决方案如上把不变的参数集合clone一遍就好了

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