/// <summary>
/// Opens a text file,
/// tries reading file 500 times before throwing IO Exception,
/// and then closes the file.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <returns>Task which ultimately returns a string containing all lines of the file.</returns>
public async static Task <string> ReadAllTextRetry(string fileName)
{
if (string.IsNullOrEmpty(fileName))
{
return(null);
}
// If the file doesn't exists we don't need to try 500 time to open it.
if (!File.Exists(fileName))
{
return(null);
}
int retryCount = 500;
try
{
return(await PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), retryCount)
.ExecuteAsync(() => Task.FromResult <string>(File.ReadAllText(fileName))));
}
catch (IOException)
{
Logger.Log("Exception: Tried " + retryCount + " times for reading, but the file " + fileName + " is still in use. Exiting gracefully.");
}
return(string.Empty);
}
/// <summary>
/// Creates a new file, writes the specified byte array to the file, and then closes
/// the file. If the target file already exists, it is overwritten. If the target
/// file is in use, try 5 times before throwing IO Exception.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <param name="value">The bytes to write to the file.</param>
public async static Task WriteAllBytesRetry(string fileName, byte[] value)
{
int retryCount = 500;
try
{
await Task.Run(() => File.WriteAllBytes(fileName, value))
.ExecuteRetryableTaskAsync(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), retryCount));
}
catch (IOException)
{
Logger.Log("Exception: Tried" + retryCount + " times for writing, but the file " + fileName + " is still in use. Exiting gracefully.");
}
}
/// <summary>
/// Creates a new file, writes the specified string to the file, and then closes
/// the file. If the target file already exists, it is overwritten. If the target
/// file is in use, try 5 times before throwing IO Exception.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <param name="contents">The string to write to the file.</param>
public async static Task WriteAllTextRetry(string fileName, string contents, bool withBOM = true)
{
int retryCount = 500;
try
{
await Task.Run(() => File.WriteAllText(fileName, contents, new UTF8Encoding(withBOM)))
.ExecuteRetryableTaskAsync(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), retryCount));
}
catch (IOException)
{
Logger.Log("Exception: Tried " + retryCount + " times for writing, but the file " + fileName + " is still in use. Exiting gracefully.");
}
}
/// <summary>
/// Opens a text file,
/// tries reading file into a byte array 5 times before throwing IO Exception,
/// and then closes the file.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <returns>Task which ultimately returns all lines of the file, or the lines that are the result of a query.</returns>
public async static Task <byte[]> ReadAllBytesRetry(string fileName)
{
int retryCount = 500;
try
{
return(await Task.FromResult <byte[]>(File.ReadAllBytes(fileName))
.ExecuteRetryableTaskAsync <byte[]>(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), retryCount)));
}
catch (IOException)
{
Logger.Log("Exception: Tried " + retryCount + " times for reading, but the file " + fileName + " is still in use. Exiting gracefully.");
}
return(Enumerable.Empty <byte>().ToArray());
}
/// <summary>
/// Tries reading the lines of a file 500 times before throwing IO Exception.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <returns>Task which ultimately returns all lines of the file, or the lines that are the result of a query.</returns>
public async static Task <IEnumerable <string> > ReadAllLinesRetry(string fileName)
{
if (string.IsNullOrEmpty(fileName))
{
return(null);
}
int retryCount = 500;
try
{
return(await PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), retryCount)
.ExecuteAsync(() => Task.FromResult <IEnumerable <string> >(File.ReadLines(fileName))));
}
catch (IOException)
{
Logger.Log("Exception: Tried " + retryCount + " times for reading, but the file " + fileName + " is still in use. Exiting gracefully.");
}
return(Enumerable.Empty <string>());
}
/// <summary>
/// Creates a new file, writes the specified byte array to the file, and then closes
/// the file. If the target file already exists, it is overwritten. If the target
/// file is in use, try 5 times before throwing IO Exception.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <param name="value">The bytes to write to the file.</param>
public async static Task WriteAllBytesRetry(string fileName, byte[] value)
{
await BeginWrite(Task.Run(() => File.WriteAllBytes(fileName, value))
.ExecuteRetryableTaskAsync(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), 5)));
}
/// <summary>
/// Creates a new file, writes the specified string to the file, and then closes
/// the file. If the target file already exists, it is overwritten. If the target
/// file is in use, try 5 times before throwing IO Exception.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <param name="contents">The string to write to the file.</param>
public async static Task WriteAllTextRetry(string fileName, string contents)
{
await BeginWrite(Task.Run(() => File.WriteAllText(fileName, contents, Encoding.UTF8))
.ExecuteRetryableTaskAsync(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), 5)));
}
/// <summary>
/// Opens a text file,
/// tries reading file into a byte array 5 times before throwing IO Exception,
/// and then closes the file.
/// </summary>
/// <param name="fileName">The file to open for reading.</param>
/// <returns>Task which ultimately returns all lines of the file, or the lines that are the result of a query.</returns>
public async static Task <byte[]> ReadAllBytesRetry(string fileName)
{
return(await BeginRead <byte[]>(Task.FromResult <byte[]>(File.ReadAllBytes(fileName))
.ExecuteRetryableTaskAsync <byte[]>(PolicyFactory.GetPolicy(new FileTransientErrorDetectionStrategy(), 5))));
}
