Hi shenqw,
建议你检查一下你的项目类型和 .Net Framework 版本,如果不是.Net Framework 项目 或者项目的.Net Framework版本低于3.5(如Shuanghua Li 所说)是没有ADO.NET实体数据模型的项目模板的.
Best regards,
Zhanglong Wu
MSDN Community Support
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