/// <summary>
/// 结束读取文件
/// </summary>
/// <param name="result"></param>
private void EndRead(IAsyncResult result)
{
if (FileStream == null)
{
return;
}
int length = FileStream.EndRead(result);
ReadFileObject state = (ReadFileObject)result.AsyncState;
int index = state.Index;
byte[] buffer = state.Buffer;
ReadFileBufferEventArgs e = null;
if (length < _partSize)
{
byte[] realBuffer = new byte[length];
Buffer.BlockCopy(buffer, 0, realBuffer, 0, length);
e = new ReadFileBufferEventArgs(index, realBuffer);
}
else
{
e = new ReadFileBufferEventArgs(index, buffer);
}
OnReadFileBuffer(e);
}
/// <summary>
/// 读取文件
/// </summary>
/// <param name="index"></param>
public void Read(int index)
{
int size = _partSize;
if (Length - _partSize * index < _partSize)
{
size = (int)(Length - _partSize * index);
}
byte[] buffer = new byte[size];
ReadFileObject obj = new ReadFileObject(index, buffer);
FileStream.Position = index * _partSize;
FileStream.BeginRead(
buffer,
0,
size,
new AsyncCallback(EndRead),
obj);
}