protected StatefulComponentBase()
{
StateChanged = (_, eventKind) => {
if ((eventKind & StateHasChangedTriggers) == 0)
{
return;
}
using var suppressing = ExecutionContextExt.SuppressFlow();
Task.Run(() => this.StateHasChangedAsync(BlazorCircuitContext));
};
}
public Task Run(
CommandContext context, bool isolate,
CancellationToken cancellationToken = default)
{
// Task.Run is used to call RunInternal to make sure parent
// task's ExecutionContext won't be "polluted" by temp.
// change of CommandContext.Current (via AsyncLocal).
if (!isolate)
{
return(Task.Run(() => RunInternal(context, cancellationToken), default));
}
using var _ = ExecutionContextExt.SuppressFlow();
return(Task.Run(() => RunInternal(context, cancellationToken), default));
}
protected virtual void Dispose(bool disposing)
{
if (IsDisposed || !disposing)
{
return;
}
IsDisposed = true;
using var suppressing = ExecutionContextExt.SuppressFlow();
_ = Task.Run(async() => {
using (await AsyncLock.Lock().ConfigureAwait(false)) {
var dbContext = DbContext;
if (dbContext != null)
{
await dbContext.DisposeAsync().ConfigureAwait(false);
}
}
});
}
public Task OnOperationCompleted(IOperation operation)
{
if (!StringComparer.Ordinal.Equals(operation.AgentId, AgentInfo.Id.Value)) // Only local commands require notification
{
return(Task.CompletedTask);
}
var commandContext = CommandContext.Current;
if (commandContext != null) // It's a command
{
var operationScope = commandContext.Items.Get <DbOperationScope <TDbContext> >();
if (operationScope == null || !operationScope.IsUsed) // But it didn't change anything related to TDbContext
{
return(Task.CompletedTask);
}
}
// If it wasn't command, we pessimistically assume it changed something
using var _ = ExecutionContextExt.SuppressFlow();
Task.Run(Notify);
return(Task.CompletedTask);
}