This is how I created the Blazor web app project in VS Code (Ctrl+Shift+P> .NET: New Project... > Blazor Web App):
In my Razor page in a Blazor web app, I normally implement the asynchronous disposal of DbContext as follows:
@implements IAsyncDisposable@code { private SQLServerContext context = default!; protected override async Task OnInitializedAsync() { context = DbFactory.CreateDbContext(); // await methods here... } public async ValueTask DisposeAsync() { await context.DisposeAsync(); }}Then, I ensure that the data class model declared in the DbContext is defined as async Task<Model> in my methods class instance, which is used with the EF Core database setup.
For example:
public async Task<List<Model>> Method(param here){ // other code here return await _context.PlainTextList .FromSql(sqlParam) .ToListAsync();}It works perfectly fine if the process of fetching records asynchronously is interrupted by navigation (which triggers the DisposeAsync() method).
However, the problem is that on some other Razor page, I have many data class models, each of which has a different size, and these also require large object retrievals.
If I deliberately interrupt the process of data retrieval, it produces this error:
Unhandled exception rendering component: Invalid operation. The connection is closed.
System.InvalidOperationException: Invalid operation. The connection is closed.
I searched online to establish a deep understanding of this issue and realized that I needed to read the error message thoroughly. The problem is that since all of the processes are handled asynchronously, they are interrupted by the DisposeAsync() method of the DbContext. So to address this case, I tried to comment out the:
@implements IAsyncDisposablepublic async ValueTask DisposeAsync(){ await context.DisposeAsync();}It solved the error even when I interrupted the database retrieval process. However, my concern is, since I cannot implement resource disposal in this way, what other way can I dispose of the DbContext instance to avoid resource leaks?