从字节数组中读取字节 [英] read bytes from byte array

问题描述

我有一个678560大小的字节数组。



i想要读取第0个索引到10478的数据。


无论如何，
是从指定位置读取数据到数据长度。



i为此编写代码，但我在谷歌尝试但没有得到完美答案。

i have a byte array of 678560 size.

i want to read data from 0th index to 10478.

is anyway to read data from specified position to length of data.

i wrote code for that but i tried in Google but didn't get perfect answer.

using (StreamReader r = new StreamReader(path))
{
   string Readalltextofdata = r.ReadToEnd();
   byte[] readalltextofdataintobytes = StringToByteArray(Readalltextofdata);


}

     public static byte[] StringToByteArray(String hex)
        {
            int NumberChars = hex.Length;
            byte[] bytes = new byte[NumberChars / 2];
            for (int j = 0; j < NumberChars; j += 2)
                bytes[j / 2] = Convert.ToByte(hex.Substring(j, 2), 16);
            return bytes;
        }

因此在readalltextofdataintobytes中创建并且大小为678560.现在从这个字节数组我想从第0位读到10478.



提前感谢。

so in readalltextofdataintobytes created and size is 678560. now from this byte array i want to read from 0th position to 10478.

thanks in advance.

推荐答案

使用 Linq

Use Linq

var someBytes = readalltextofdataintobytes.Take(10478).ToArray();

你也可以使用 Skip 跳过你不想要的字节阅读。



希望这会有所帮助，

Fredrik

You can also use Skip to skip ahead past the bytes you don't want to read.

Hope this helps,
Fredrik

实际上是最有效的方法除了固定和不安全的代码之外，这是使用 Buffer.BlockCopy [ ^ ]方法。



在你的情况下，它将是：

Actually the most efficient way to do this, aside from pinning and unsafe code, is to use the Buffer.BlockCopy[^] method.

In your case, it would be:

byte[] source = //...
byte[] byteSection = new byte[10478];
Buffer.BlockCopy(source, 0, byteSection, 0, byteSection.Length);

复制更多/更少数据的方法只是改变byteSection数组的大小。

That way to copy more/less data just change the size of the byteSection array.

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