Cannot access a disposed object in ASP.NET Core when injecting DbContext

The “Cannot access a disposed object” exception in ASP.NET Core, especially when using Entity Framework’s DbContext, is a common issue developers face. This article explores the root causes, prevention strategies, and best practices to avoid this error in modern ASP.NET Core applications.

Understanding the Error

The ObjectDisposedException typically occurs when an attempt is made to use an object that has already been disposed. In the context of ASP.NET Core and Entity Framework, this often involves the DbContext. The error message generally looks like this:

System.ObjectDisposedException: Cannot access a disposed object.

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