c# - 将 byte[] 附加到 MemoryStream

Question

我正在尝试读取每个文件的 byte[] 并将其添加到 MemoryStream。下面是抛出错误的代码。我在追加时缺少什么？

byte[] ba = null;
List<string> fileNames = new List<string>();
int startPosition = 0;
using (MemoryStream allFrameStream = new MemoryStream())
{
    foreach (string jpegFileName in fileNames)
    {
        ba = GetFileAsPDF(jpegFileName);

        allFrameStream.Write(ba, startPosition, ba.Length); //Error here
        startPosition = ba.Length - 1;
    }

    allFrameStream.Position = 0;

    ba = allFrameStream.GetBuffer();

    Response.ClearContent();
    Response.AppendHeader("content-length", ba.Length.ToString());
    Response.ContentType = "application/pdf";
    Response.BinaryWrite(ba);
    Response.End();
    Response.Close();              
}

错误:

Offset and length were out of bounds for the array or count is greater than the number of elements from index to the end of the source collection

Answer 1

startPosition 没有偏移到 MemoryStream，而是偏移到 ba。改成

allFrameStream.Write(ba, 0, ba.Length); 

所有字节数组将附加到allFrameStream

顺便说一句:不要使用 ba = allFrameStream.GetBuffer(); 而是使用 ba = allFrameStream.ToArray();(你实际上不需要 MemoryStream 的内部缓冲区)。