将文件中的 pdf 流另存为 pdf

Question

我有一个保存 pdf 流的变量，该变量的类型为 System.Threading.Tasks.Task<Stream>。我想将此 pdf 流保存在 pdf 文件中，但我不知道该怎么做。下面是我尝试处理的一段代码。关于我可以尝试将此流保存在文件中的任何想法

System.Threading.Tasks.Task<Stream> pdf = //Some logic here which gets a pdf stream

我想将变量中的pdf内容存储为pdf文件

为此我写了这个方法

public static void SaveStreamAsFile(string filePath, System.Threading.Tasks.Task<Stream> inputStream, string fileName)
{

    string path = Path.Combine(filePath, fileName);
    using (FileStream outputFileStream = new FileStream(path, FileMode.Create))
    {
       // logic
    }
}

Answer 1

读取输入流并将其写入输出流..

public static async Task SaveStreamAsFile(string filePath, System.Threading.Tasks.Task<Stream> inputStream, string fileName)
{
    var stream = await inputStream;
    var path = Path.Combine(filePath, fileName);
    var bytesInStream = new byte[stream.Length];

    await stream.ReadAsync(bytesInStream, 0, (int) bytesInStream.Length);

    using (var outputFileStream = new FileStream(path, FileMode.Create))
    {
       await outputFileStream.WriteAsync(bytesInStream, 0, bytesInStream.Length);
    }
}