如何从EF Configuration.cs文件读取文件内容？

Question

I am using EF 6 Code-base migration. I want to read the file from Configuration.cs Seed() method to insert as default data. I am using HostingEnvironment.MapPath() as below:

string _homeContent = System.IO.File.ReadAllText( HostingEnvironment.MapPath(@"~/Data/DefaultContents/Home.html"));

But HostingEnvironment.MapPath return null value when I run the Update-database command from Package-Management Console .

Running Seed method.

System.ArgumentNullException: Value cannot be null.

Parameter name: path at System.IO.File.ReadAllText(String path)

Kindly advise how to read the physical file from Configuration.cs Seed() method.

Answer 1

May I answer by myself.

Server.MapPath and HostingEnvironment.MapPath is not available in this time because HttpContext object is not ready yet.

AppDomain.CurrentDomain.BaseDirectory return "..\\your project directory\\bin"

Eg C:\\YourSolutionDirectory\\YourProjectDirectory\\bin

But we need to go up from " bin " folder, so that using Path.Combine() method and get exact file path.

string homeFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "..", @"Data\DefaultContents\Home.html");

Result: C:\\YourSolutionDirectory\\YourProjectDirectory\\Data\\DefaultContents\\Home.html