突然,在实例化生成的ObjectContext类时,我一直得到一个MetadataException。App.Config中的连接字符串看起来是正确的-自从上次它工作以来没有改变-我已经尝试从底层数据库中重新生成一个没有变化的新模型(edmx-file)。

有人有什么想法吗?

进一步的细节:我没有更改任何属性,没有更改任何输出程序集的名称,也没有尝试将EDMX嵌入到程序集中。我只是下班后等了10个小时才回来。然后它就不管用了。

我试过重新创造EDMX。我试着重新创建这个项目。我甚至尝试从头开始重新创建数据库。不管怎样,运气不好。


当前回答

在我的情况下,列出的答案没有一个是有效的,所以我发布了这个。

For my case, building on Visual studio and running it with IIS express worked fine. But when I was deploying using Nant scripts as a stand-alone website was giving errors. I tried all the suggestions above and then realized the DLL that was generated by the nant script was much smaller than the one generated by VS. And then I realized that Nant was unable to find the .csdl, .msl and .ssdl files. So then there are really two ways to solve this issue, one is to copy the needed files after visual studio generates them and include these files in the build deployment. And then in Web.config, specify path as:

"metadata=~/bin/MyDbContext.csdl|~/bin/MyDbContext.ssdl|~/bin/MyDbContext.msl;provider=System.Data.SqlClient;...."

这是假设您已经手动复制文件到您正在运行的网站的bin目录。如果它在不同的目录中,则相应地修改path。 第二种方法是在Nant脚本中执行EdmGen.exe,并生成文件,然后将它们作为资源,如下例所示: https://github.com/qwer/budget/blob/master/nant.build

其他回答

我从解决方案中的所有项目中删除了\bin和\obj文件夹,然后重新构建解决方案,它工作得很好

我也有同样的问题。我用反射器查看了我的编译dll,发现资源的名称是不正确的。我重新命名了,现在看起来很好。

在我的案例中,EDMX的XML结构中的语法错误也是原因。我发现在VS无法显示图表之后,我打开了XML编辑器。

之前的合并是导致语法错误的根本原因。

我也遇到了和Rick一样的问题和解决方案,只是我要将一个现有的.edmx导入到一个新项目中,虽然基本名称空间无关紧要,但它被导入到不同的子目录中,因此我还必须更新Web内部的连接字符串。配置在三个地方,包括不同的子目录命名:

在我的情况下,列出的答案没有一个是有效的,所以我发布了这个。

For my case, building on Visual studio and running it with IIS express worked fine. But when I was deploying using Nant scripts as a stand-alone website was giving errors. I tried all the suggestions above and then realized the DLL that was generated by the nant script was much smaller than the one generated by VS. And then I realized that Nant was unable to find the .csdl, .msl and .ssdl files. So then there are really two ways to solve this issue, one is to copy the needed files after visual studio generates them and include these files in the build deployment. And then in Web.config, specify path as:

"metadata=~/bin/MyDbContext.csdl|~/bin/MyDbContext.ssdl|~/bin/MyDbContext.msl;provider=System.Data.SqlClient;...."

这是假设您已经手动复制文件到您正在运行的网站的bin目录。如果它在不同的目录中,则相应地修改path。 第二种方法是在Nant脚本中执行EdmGen.exe,并生成文件,然后将它们作为资源,如下例所示: https://github.com/qwer/budget/blob/master/nant.build