System.OverflowException: 数组维度超过了支持的范围。

Code:

FileStream fs = File.OpenRead(file);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
string tempfile = file.Substring(staticFile.LastIndexOf("\\") + 1);
ZipEntry entry = new ZipEntry(tempfile);
entry.DateTime = DateTime.Now;
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
outstream.PutNextEntry(entry);
outstream.Write(buffer, 0, buffer.Length);

日志：

[2023-09-25 15:21:23.196 +08:00] [ERR] 文件压缩失败！

文件：H:\slpk\345slpk\

System.OverflowException: 数组维度超过了支持的范围。

在 cim_dgp.Common.DirectoryUtil.ZipCompress(String strFile, ZipOutputStream outstream, String staticFile) 位置 E:\project\wuchuan\code\cim-dgp\cim_dgp\cim_dgp.Common\DirectoryHelper\DirectoryUtil.cs:行号 594

在 cim_dgp.Common.DirectoryUtil.DirectoryZip(String strFile, String strZip) 位置 E:\project\wuchuan\code\cim-dgp\cim_dgp\cim_dgp.Common\DirectoryHelper\DirectoryUtil.cs:行号 559

问题定位：

byte[] buffer = new byte[fs.Length];

原因：

文件过大时，使用文件流长度创建数组，内存溢出；

解决：分块读取

string relativePath = Path.GetRelativePath(rootFolder, file);
using (FileStream fs = File.OpenRead(file))
{
    ZipEntry entry = new ZipEntry(relativePath)
    {
        DateTime = DateTime.Now,
        Size = fs.Length
    };
    zipStream.PutNextEntry(entry);
    byte[] buffer = new byte[4096];
    int bytesRead;
    while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) > 0)
    {
        zipStream.Write(buffer, 0, bytesRead);
    }
}