63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
using System.IO;
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using System.Threading.Tasks;
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namespace IRaCIS.Core.Infrastructure.Extention
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{
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/// <summary>
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/// 大文件操作扩展类
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/// </summary>
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public static class FileExt
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{
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/// <summary>
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/// 以文件流的形式复制大文件
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/// </summary>
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/// <param name="fs">源</param>
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/// <param name="dest">目标地址</param>
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/// <param name="bufferSize">缓冲区大小，默认8MB</param>
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public static void CopyToFile(this Stream fs, string dest, int bufferSize = 1024 * 8 * 1024)
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{
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using var fsWrite = new FileStream(dest, FileMode.OpenOrCreate, FileAccess.ReadWrite);
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byte[] buf = new byte[bufferSize];
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int len;
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while ((len = fs.Read(buf, 0, buf.Length)) != 0)
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{
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fsWrite.Write(buf, 0, len);
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}
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}
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/// <summary>
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/// 以文件流的形式复制大文件(异步方式)
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/// </summary>
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/// <param name="fs">源</param>
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/// <param name="dest">目标地址</param>
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/// <param name="bufferSize">缓冲区大小，默认8MB</param>
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public static async void CopyToFileAsync(this Stream fs, string dest, int bufferSize = 1024 * 1024 * 8)
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{
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using var fsWrite = new FileStream(dest, FileMode.OpenOrCreate, FileAccess.ReadWrite);
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byte[] buf = new byte[bufferSize];
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int len;
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await Task.Run(() =>
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{
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while ((len = fs.Read(buf, 0, buf.Length)) != 0)
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{
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fsWrite.Write(buf, 0, len);
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}
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}).ConfigureAwait(true);
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}
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/// <summary>
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/// 将内存流转储成文件
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/// </summary>
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/// <param name="ms"></param>
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/// <param name="filename"></param>
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public static void SaveFile(this MemoryStream ms, string filename)
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{
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using var fs = new FileStream(filename, FileMode.Create, FileAccess.Write);
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byte[] buffer = ms.ToArray(); // 转化为byte格式存储
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fs.Write(buffer, 0, buffer.Length);
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fs.Flush();
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}
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}
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} |