The solution that the ado.net model created by vs2012 can not be instantiated

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Recently upgraded from vs2010 to vs2012, building a data model, found that the generated things are not the same as before, and can not be instantiated. Baidu tried n keywords, and I finally found a solution. Record it here.

1. Open the designer, that is, double-click this

two。 If no object is selected, find the attribute, code generation strategy, and change it from none to default.

3. Delete two tt files under edmx

4. Rebuild the project

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