如何将流转换为MemoryStream

Question

在我的代码中尝试：

流内容

engine.SetDocument((MemoryStream)content); //No work

或者

var a = new MemoryStream();
engine.SetDocument(content.CopyTo(a)); //Error 

Answer 1

CopyTo是一个void方法，所以不返回任何内容，请尝试以下方法：

var a = new MemoryStream();
content.CopyTo(a);
engine.SetDocument(a);

Answer 2

using (MemoryStream ms = new MemoryStream())
using (FileStream file = new FileStream("file.bin", FileMode.Open, FileAccess.Read)) 
{
   byte[] bytes = new byte[file.Length];
   file.Read(bytes, 0, (int)file.Length);
   ms.Write(bytes, 0, (int)file.Length);
}