c#之在 Web 服务 soap 响应中发送二进制文件

我有来自返回二进制文件的 ftp 网络请求的响应流。 我想将二进制数据放入 byte[]，然后对该数组进行编码并将其作为 Web 服务响应发送。

Stream responseStream = webResponse.GetResponseStream(); 
byte[] byteToEncode= ReadFully(responseStream,1024); 
String str=Convert.ToBase64String(byteToEncode); 

我用了网上找到的那个函数把流转成byte[]

/// <summary> 
/// Reads data from a stream until the end is reached. The 
/// data is returned as a byte array. An IOException is 
/// thrown if any of the underlying IO calls fail. 
/// </summary> 
/// <param name="stream">The stream to read data from</param> 
/// <param name="initialLength">The initial buffer length</param> 
 
public static byte[] ReadFully (Stream stream, int initialLength) 
{ 
    // If we've been passed an unhelpful initial length, just  use 32K. 
    if (initialLength < 1) 
    { 
        initialLength = 32768; 
    } 
 
    byte[] buffer = new byte[initialLength]; 
    int read=0; 
 
  int chunk; 
    while ( (chunk = stream.Read(buffer, read, buffer.Length-read)) > 0) 
    { 
        read += chunk; 
 
        // If we've reached the end of our buffer, check to see if there's 
        // any more information 
 
        if (read == buffer.Length) 
        { 
            int nextByte = stream.ReadByte(); 
 
            // End of stream? If so, we're done 
 
            if (nextByte==-1) 
            { 
                return buffer; 
            } 
 
            // Nope. Resize the buffer, put in the byte we've just 
            // read, and continue 
            byte[] newBuffer = new byte[buffer.Length*2]; 
 
            Array.Copy(buffer, newBuffer, buffer.Length); 
            newBuffer[read]=(byte)nextByte; 
            buffer = newBuffer; 
            read++; 
        } 
    } 
    // Buffer is now too big. Shrink it. 
 
    byte[] ret = new byte[read]; 
    Array.Copy(buffer, ret, read); 
    return ret; 
}  

但我有一个异常(exception)说:

This stream does not support seek operations. 

如有任何帮助，我将不胜感激。

谢谢， 萨拉

请您参考如下方法:

您可能需要重写 ReadFully 函数以避免像 Length 这样的属性，在未完全接收到完整流时，它需要了解更多关于流的信息。