如何BLOB数据转换为字符串？ [英] How to convert blob data to string?

问题描述

我使用下面的函数将二进制数据转换为文本

I am using following function to convert binary data to text

 public string BinaryToText(byte[] data)
 {
  MemoryStream stream = new MemoryStream(data);
  StreamReader reader = new StreamReader(stream, encoding.UTF8);
  string text =  reader.ReadTod();
  return text;
 }

但的System.OutOfMemoryException 显示为30MB的数据。如何解决这个问题，转换较大然后使用这个或任何更好的方法100Mb的数据？

But System.OutOfMemoryException is shown for 30Mb data. How to solve this problem and convert larger then 100Mb data using this or any better method?

推荐答案

试试这个：

public string BinaryToText(byte[] data)
{
    return Encoding.UTF8.GetString(data);
}

这将消耗更少的内存。如果是的还是的内存用完，你需要以块的形式读它 - 但你如何使用数据将决定是否这是可能的。什么是你在返回的字符串干什么呢？

It will consume less memory. If it still runs out of memory, you'll need to read it in chunks - but how you are using the data will determine if that is possible. What are you doing with the returned string?

另外，我将重申我刚才的问题：？是输入数据的真正的UTF8数据

Also I will reiterate my earlier question: Is the input data really UTF8 data?

如果您的可以的处理数据被返回多个字符串，你可以做这样的事情：

If you can handle the data being returned as multiple strings, you can do something like this:

public IEnumerable<string> BinaryToStrings(byte[] data, int maxStringLength)
{
    var buffer = new char[maxStringLength];

    using (MemoryStream stream = new MemoryStream(data))
    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
    {
        while (true)
        {
            int count = reader.Read(buffer, 0, maxStringLength);

            if (count == 0)
            {
                break;
            }

            yield return new string(buffer, 0, count);
        }
    }
}

然后就可以调用，在foreach循环像这样：

Then you can call that in a foreach loop like so:

foreach (string chunk in BinaryToStrings(data, 1024))
{
    // Do something with 'chunk'...
}

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