This EntitySet of Type 'Data.Tbl_Student' does not support the 'Add' operation.原因
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最近在做entity framework +wcf ria项目，遇到一个问题 ，在添加实体时报异常“This EntitySet of Type 'Data.Tbl_Student' does not support the 'Add' operation.”
意思是：实体Tbl_Student没有Add方法。
找遍网络没有找到原因。
后来想想，可能是因为更新了edmx实体，但没有更新域服务，才导致这个错误，重新从数据库更新模型，再重新生成或新建域服务类。OK，问题好了。
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