C#如何使用stream保存成文件？

Save Stream As File In C#，从Stream二进制流中保存成文件，关键代码如下：

public static void SaveStreamAsFile(string filePath, Stream inputStream, string fileName) {  
 DirectoryInfo info = new DirectoryInfo(filePath);  
 if (!info.Exists) {  
  info.Create();  
 }  
  
 string path = Path.Combine(filePath, fileName);  
 using(FileStream outputFileStream = new FileStream(path, FileMode.Create)) {  
  inputStream.CopyTo(outputFileStream);  
 }  
} 

或者有这样的用法：

public void CopyStream(Stream stream, string destPath)
{
  using (var fileStream = new FileStream(destPath, FileMode.Create, FileAccess.Write))
  {
    stream.CopyTo(fileStream);
  }
}

也可以写成这样：

private void SaveFileStream(String path, Stream stream)
{
    var fileStream = new FileStream(path, FileMode.Create, FileAccess.Write);
    stream.CopyTo(fileStream);
    fileStream.Dispose();
}

想要更多控制可写成如下：

public void SaveStreamToFile(string fileFullPath, Stream stream)
{
    if (stream.Length == 0) return;

    // Create a FileStream object to write a stream to a file
    using (FileStream fileStream = System.IO.File.Create(fileFullPath, (int)stream.Length))
    {
        // Fill the bytes[] array with the stream data
        byte[] bytesInStream = new byte[stream.Length];
        stream.Read(bytesInStream, 0, (int)bytesInStream.Length);

        // Use FileStream object to write to the specified file
        fileStream.Write(bytesInStream, 0, bytesInStream.Length);
     }
}

最后需要根据自己的实际业务逻辑进行调整。

https://www.c-sharpcorner.com/Blogs/save-stream-as-file-in-c-sharp
https://stackoverflow.com/questions/411592/how-do-i-save-a-stream-to-a-file-in-c