C# 如何将整个流加载到 MemoryStream 中？
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How to load entire stream into MemoryStream?
提问by apocalypse
Like in the topic: I want to read data from a file (from stream) into memory (memorystream) to improve my app speed. How to do it?
就像在主题中一样：我想将文件（从流）中的数据读取到内存（内存流）中以提高我的应用程序速度。怎么做？
采纳答案by Jon Skeet
A few options:
几个选项：
Read it all into a byte array first...
首先将其全部读入字节数组...
byte[] data = File.ReadAllBytes(file);
MemoryStream stream = new MemoryStream(data);
Or use .NET 4's CopyTo method
或者使用 .NET 4 的 CopyTo 方法
MemoryStream memoryStream = new MemoryStream();
using (Stream input = File.OpenRead(file))
{
input.CopyTo(memoryStream);
}
memoryStream.Position = 0;
Or do it manually
或者手动执行
MemoryStream memoryStream = new MemoryStream();
using (Stream input = File.OpenRead(file))
{
byte[] buffer = new byte[32 * 1024]; // 32K buffer for example
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
{
memoryStream.Write(buffer, 0, bytesRead);
}
}
memoryStream.Position = 0;
回答by Austin Salonen
If you can hold the entire file in memory, File.ReadAllBytesshould work for you:
如果您可以将整个文件保存在内存中，File.ReadAllBytes应该适合您：
using (var ms = new MemoryStream(File.ReadAllBytes(file)))
{
// do work
}
