在c＃中将byte []附加到字符串中

Question

My javascript code sends blobs of data to a handler in C#. My Javascript code is working fine, and I have already tried to receive the data from client(javascript) and pass them to the C# handler and save them in a local Folder.

Instead of saving the data in a folder, I want to now save it in a string .
My handler each time gets a piece of my information as a byte[] .

my Javascript:

xhr = new XMLHttpRequest();
// this is not the complete code 
// I slice my file and push them in var blobs = [];
blobs.push(file.slice(start, end));
while (blob = blobs.shift()) {

    xhr.send(blob);
    count++;
}

My C# handler: In here, the bool ok never gets set to true . How can I get all my files chunk by chunk as I am sending them from javascript; and, instead of saving in a folder, saving it in a string?

public void ProcessRequest(HttpContext context)
{
    try
    {
        byte[] buffer = new byte[context.Request.ContentLength];
        context.Request.InputStream.Read(buffer, 0, context.Request.ContentLength);
        string fileSize = context.Request.Headers.Get("X_FILE_SIZE");

        bool ok = false;
        System.Text.StringBuilder myData = new System.Text.StringBuilder();
        myData.Append(buffer);
        if(myData.Length == int.Parse(fileSize)){ ok=true;  }

    }
    catch (Exception)
    {

        throw;
    }
}

Answer 1

There is no overload of StringBuilder.Append that takes a byte array, so it will call the StringBuilder.Append(object) method. That will call ToString on the byte array to get a string value, which results in the string "System.Byte[]" .

To get the byte array as a string, you need to know what the bytes represent. For example, if the bytes are text that is encoded as UTF-8 then you can use the Encoding.UTF8 class to decode it:

myData.Append(Encoding.UTF8.GetString(buffer));

Note that multi-byte encodings like UTF-8 may represent one character as multiple bytes, so the string length may be different from the byte array length.