C# 如何将blob数据转换为字符串？
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How to convert blob data to string?
提问by mck
I am using the following function to convert binary data to text:
我正在使用以下函数将二进制数据转换为文本：
public string BinaryToText(byte[] data)
{
MemoryStream stream = new MemoryStream(data);
StreamReader reader = new StreamReader(stream, encoding.UTF8);
string text = reader.ReadTod();
return text;
}
But I get an OutOfMemoryExceptionfor 30Mb data.
但是我得到了一个OutOfMemoryException30Mb 的数据。
How can I solve this problem and convert data larger than 100Mb, using this or any better method?
如何使用此方法或任何更好的方法解决此问题并转换大于 100Mb 的数据？
采纳答案by Matthew Watson
Try this instead:
试试这个：
public string BinaryToText(byte[] data)
{
return Encoding.UTF8.GetString(data);
}
It will consume less memory. If it stillruns 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?
它会消耗更少的内存。如果它仍然耗尽内存，您需要分块读取它 - 但是您如何使用数据将决定这是否可行。你用返回的字符串做什么？
Also I will reiterate my earlier question: Is the input data reallyUTF8 data?
我还要重申我之前的问题：输入数据真的是UTF8 数据吗？
If you canhandle the data being returned as multiple strings, you can do something like this:
如果您可以处理作为多个字符串返回的数据，您可以执行以下操作：
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);
}
}
}
Then you can call that in a foreach loop like so:
然后你可以像这样在 foreach 循环中调用它：
foreach (string chunk in BinaryToStrings(data, 1024))
{
// Do something with 'chunk'...
}
