我解决了这个问题。通过在edmx文件中添加代码生成项选项。我从Nuget.it为c＃模板选择dbcontext生成器生成所有文件，如上下文和模型类。

I solved the issue. by went for add code generate item option in edmx file.the i chose dbcontext generator for c# template from Nuget.it generate all the files like context and model classes.