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Just how 'disposable' is ReaderWriterLockSlim?


Just how 'disposable' is ReaderWriterLockSlim?

By : DataAnalyst
Date : November 21 2020, 07:31 AM
like below fixes the issue The problem with unmanaged OS handles is that handles come from a limited supply. The GC is not aware of this.
The pure memory consumption of a handle is not that big. Nothing more than an object in kernel memory and probably hash table entry somewhere.
code :


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Types that own disposable fields should be disposable. how to solve this warning?

Types that own disposable fields should be disposable. how to solve this warning?


By : Rodrigo Tomaz
Date : March 29 2020, 07:55 AM
To fix this issue I fully agree with the compiler - you need to dispose your fields here, or (as already noted) - not make them fields in the first place:
code :
class DBConnectivity : IDisposable // caveat! read below first
{
    public void Dispose() {
        if(connection != null) { connection.Dispose(); connection = null; }
        if(command != null) { command.Dispose(); command = null; }
        if(dataReader != null) { dataReader.Dispose(); dataReader = null; }
    }
static class DBConnectivity
{
    public static List<MasterTableAttributes> GetMasterTableList()
    {
        var connectionString = ConfigurationManager.ConnectionStrings["Master"].ConnectionString;
        using(var connection = new SqlConnection(connectionString))
        {
            connection.Open();
            const string masterSelectQuery = "SELECT * FROM MASTER_TABLE";
            using(var command = new SqlCommand(masterSelectQuery, connection))
            using(var dataReader = command.ExecuteReader())
            {
                var masterTableList = new List<MasterTableAttributes>();

                while (dataReader.Read())
                {
                    MasterTableAttributes masterTableAttribute = new MasterTableAttributes()
                    {
                        fileId = Convert.ToInt32(dataReader["Id"]),
                        fileName = Convert.ToString(dataReader["FileName"]),
                        frequency = Convert.ToString(dataReader["Frequency"]),
                        scheduledTime = Convert.ToString(dataReader["Scheduled_Time"])
                    };
                    masterTableList.Add(masterTableAttribute);
                }
                return masterTableList;
            }
        }
    }
}
static class DBConnectivity
{
    public static List<MasterTableAttributes> GetMasterTableList()
    {
        var connectionString = ConfigurationManager.ConnectionStrings["Master"].ConnectionString;
        using(var connection = new SqlConnection(connectionString))
        {
            connection.Open();
            const string sql = "SELECT Id as [FileId], FileName, Frequency, Scheduled_Time as [ScheduledTime] FROM MASTER_TABLE";
            return connection.Query<MasterTableAttributes>(sql).ToList();
        }
    }
}
Implementing IDisposable - Disposable Fields vs. Disposable Properties

Implementing IDisposable - Disposable Fields vs. Disposable Properties


By : Alexander Yuzefovich
Date : March 29 2020, 07:55 AM
like below fixes the issue Yes, the lack of a warning is a limitation of the analysis tool.
You should definitely still implement IDisposable and clean up after yourself assuming your IDisposable properties aren't being injected from elsewhere.
WPF code analyze : CA1001 Types that own disposable fields should be disposable

WPF code analyze : CA1001 Types that own disposable fields should be disposable


By : tlouis
Date : March 29 2020, 07:55 AM
Hope this helps It is safe to ignore this warning.
Both Backgroundworker and DataTable implement IDisposable for formal reasons, they don't really need it.
Are disposable fields of disposable classes disposed of automatically

Are disposable fields of disposable classes disposed of automatically


By : eigenvector
Date : March 29 2020, 07:55 AM
With these it helps IDisposable is an interface and a pattern. It's not really part of the C# language, outside of explicit support in using and foreach. Nothing happens "automatically".
Consider, contrariwise, if this disposal did happen automatically. And consider further that it's perfectly valid for a class to hold a reference to a shared resource of some kind that may be disposable. You would have to invent new syntax to then be able to "opt out" of this automatic disposal that you were looking for.
RxSwift Disposable property isDisposed always false or Disposable closure newer called to cancel worker task

RxSwift Disposable property isDisposed always false or Disposable closure newer called to cancel worker task


By : user3073350
Date : March 29 2020, 07:55 AM
should help you out Your default of false is incorrect. It should be true. But if you don't make the disposable weak then you don't need a default.
code :
Observable<Void>.create { observer -> Disposable in
    let disposable = BooleanDisposable(isDisposed: false)

    Thread(block: { [disposable] in
            while (!disposable.isDisposed) {
                observer.onNext(())
                sleep(1)
            }
        })
        .start()

    return disposable
    }
    .debug("here")
    .take(5)
    .subscribe()
    .disposed(by: disposeBag)
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