Question

有一个大文本文件。我无法用File.ReadAllText()方法阅读它。如何在C＃中逐一阅读？

Answer 1

尝试这样的事情。

这里我以2兆字节的块读取文件。

这将减少加载文件和读取的负载，因为它读取的块为2兆字节。

如果您需要，可以将大小从2兆字节改为大小。

using (Stream objStream = File.OpenRead(FilePath))
{
    // Read data from file
    byte[] arrData = { };

    // Read data from file until read position is not equals to length of file
    while (objStream.Position != objStream.Length)
    {
        // Read number of remaining bytes to read
        long lRemainingBytes = objStream.Length - objStream.Position;

        // If bytes to read greater than 2 mega bytes size create array of 2 mega bytes
        // Else create array of remaining bytes
        if (lRemainingBytes > 262144)
        {
            arrData = new byte[262144];
        }
        else
        {
            arrData = new byte[lRemainingBytes];
        }

        // Read data from file
        objStream.Read(arrData, 0, arrData.Length);

        // Other code whatever you want to deal with read data
   }
}

如何在C＃中逐片阅读大文件

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