只读指定的范围

Question

我有一个文本文件，我只想从中读取指定的范围（如位置20到80）。

我正在使用以下代码，但它从0读取到跨度的长度。

char[] buffer = new char[span.Length];
using (StreamReader reader = new StreamReader(filename))
{               
    reader.ReadBlock(buffer, 0, span.Length);
}

有人能帮助我吗？感谢

Answer 1

char[] buffer = new char[span.Length];
using (StreamReader reader = new StreamReader(filename))
{    
    reader.BaseStream.Seek(span.Start, SeekOrigin.Begin); // or SeekOrigin.Current if you want to loop
    reader.Read(buffer, 0, span.Length);
}

假设span的类型具有Start属性。

Answer 2

char[] buffer = new char[span.Length];
using (StreamReader reader = new StreamReader(filename))
{               
    reader.ReadBlock(buffer, startIndex, span.Length);
}

startIndex =从哪里开始
span.Length =要读取的字符数

Answer 3

你试过吗？

char[] buffer = new char[span.Length];
using (StreamReader reader = new StreamReader(filename))
{               
    reader.ReadBlock(buffer, 20, span.Length);
}