如何将保存 png 图像的 byte[] 转换为要保存在文件系统上的文件？

Question

如何将保存 png 图像的 byte[] 转换为要保存在文件系统上的文件？

   using MemoryStream memoryStream = new 
   MemoryStream(response.Shipments[0].ShippingLabel);
   memoryStream.Position = 0;
   System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream);
   image.Save(@"C:\\Users\CS\Documents\FedexLabel.png", ImageFormat.Png);

上面的代码一直抛出这个错误：

    System.AggregateException
    HResult=0x80131500
    Message=One or more errors occurred. (Parameter is not valid.)
    Source=System.Private.CoreLib
    StackTrace:
    at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken 
    cancellationToken)
    at System.Threading.Tasks.Task.Wait()
    at ConsoleApp3.Program.Main(String[] args) in 

    This exception was originally thrown at this call stack:
    [External Code]
    Marketplace.FedexServices.FedexServicesTest.TestFedexCreateShipmentService() in 
    FedexServicesTest.cs

    Inner Exception 1:
    ArgumentException: Parameter is not valid.

Answer 1

我写了一个demo来把byte[]图片转成文件并保存。

管理 Nuget 包： System.Drawing.Common ;

public IActionResult Index(byte[] fileBytes)
        {
            
            //Convert byte type pictures into files to save
            var im = new System.IO.MemoryStream(fileBytes);
            var img = Image.FromStream(im);

            //save the file
            img.Save(@"C:\Users\CS\Documents\FedexLabel.png");
    

            //......

        }

Answer 2

我仍然使用这个代码

byte[] image2 = response.Shipments[0].ShippingLabel.ToArray();
MemoryStream memoryStream = new MemoryStream(image2);

BinaryReader rd = new BinaryReader(memoryStream);

string filename = "C:/Users/CS/Documents/FedexLabel.png";

byte[] buffer = new byte[1024];
FileStream outFile = new FileStream(filename, FileMode.Create);

int bytesRead;

while ((bytesRead = memoryStream.Read(buffer, 0, buffer.Length)) != 0)
    outFile.Write(buffer, 0, bytesRead);

outFile.Close();