/// <summary>
/// 写入文件，可不等待
/// </summary>
/// <param name="fileStartPoint">从文件的哪里开始写</param>
/// <param name="data">写入的数据</param>
/// <param name="dataOffset"></param>
/// <param name="dataLength"></param>
public async Task WriteAsync(long fileStartPoint, byte[] data, int dataOffset, int dataLength)
{
var task = new TaskCompletionSource <bool>();
var fileSegment = new FileSegment(fileStartPoint, data, dataOffset, dataLength, task);
FileSegmentList.Enqueue(fileSegment);
await task.Task;
}
private async Task WriteToFile()
{
while (true)
{
_isWriting = true;
var fileSegment = await FileSegmentList.DequeueAsync();
try
{
Stream.Seek(fileSegment.FileStartPoint, SeekOrigin.Begin);
await Stream.WriteAsync(fileSegment.Data, fileSegment.DataOffset, fileSegment.DataLength);
}
catch (Exception e)
{
Exception = e;
WriteFinished?.Invoke(this, EventArgs.Empty);
return;
}
_isWriting = false;
try
{
fileSegment.TaskCompletionSource?.SetResult(true);
StepWriteFinished
(
this,
new StepWriteFinishedArgs
(
fileSegment.FileStartPoint,
fileSegment.DataOffset,
fileSegment.Data,
fileSegment.DataLength
)
);
}
catch (Exception)
{
// 执行业务代码
}
var isEmpty = FileSegmentList.Count == 0;
if (isEmpty)
{
WriteFinished?.Invoke(this, EventArgs.Empty);
if (_isDispose)
{
return;
}
}
}
}
/// <summary>
/// 加入写文件队列
/// </summary>
public void QueueWrite(long fileStartPoint, byte[] data, int dataOffset, int dataLength)
{
var fileSegment = new FileSegment(fileStartPoint, data, dataOffset, dataLength);
FileSegmentList.Enqueue(fileSegment);
}