如何将整个流加载到 MemoryStream 中?

How to load entire stream into MemoryStream?(如何将整个流加载到 MemoryStream 中?)

问题描述

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?

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?

推荐答案

几个选项:

先将其全部读入一个字节数组...

byte[] data = File.ReadAllBytes(file);
MemoryStream stream = new MemoryStream(data);

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;

或者手动操作

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;

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