我将结构序列化为MemoryStream，我想保存并加载序列化结构。
那么，如何将MemoryStream保存到文件中并将其从文件加载回来？
答案 0 :(得分：320)
您可以使用MemoryStream.WriteTo或Stream.CopyTo（在框架版本4.5.2,4.5.1,4.5,4中支持）方法将内存流的内容写入另一个流。
memoryStream.WriteTo(fileStream);
更新
fileStream.CopyTo(memoryStream);
memoryStream.CopyTo(fileStream);
答案 1 :(得分：230)
假设MemoryStream名称为ms。
此代码将MemoryStream写入文件：
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write)) {
byte[] bytes = new byte[ms.Length];
ms.Read(bytes, 0, (int)ms.Length);
file.Write(bytes, 0, bytes.Length);
ms.Close();
}
并将文件读取到MemoryStream：
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);
}
在.Net Framework 4+中，你可以简单地将FileStream复制到MemoryStream，反之如下：
MemoryStream ms = new MemoryStream();
using (FileStream file = new FileStream("file.bin", FileMode.Open, FileAccess.Read))
file.CopyTo(ms);
和Reverse（MemoryStream到FileStream）：
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
ms.CopyTo(file);
答案 2 :(得分：58)
即使存在异常（很可能是文件I / O），流也应该被处理掉 - 使用子句是我最喜欢的方法，所以对于编写MemoryStream，你可以使用：
using (FileStream file = new FileStream("file.bin", FileMode.Create, FileAccess.Write)) {
memoryStream.WriteTo(file);
}
阅读它：
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);
}
如果文件很大，那么值得注意的是，读取操作将使用两倍于总文件大小的内存。一个解决方案是从字节数组创建MemoryStream - 以下代码假定您不会写入该流。
MemoryStream ms = new MemoryStream(bytes, writable: false);
我的研究（如下）显示内部缓冲区与传递它的字节数组相同，因此它应该节省内存。
byte[] testData = new byte[] { 104, 105, 121, 97 };
var ms = new MemoryStream(testData, 0, 4, false, true);
Assert.AreSame(testData, ms.GetBuffer());
答案 3 :(得分：31)
对于任何寻找短版本的人：
var memoryStream = new MemoryStream(File.ReadAllBytes("1.dat"));
File.WriteAllBytes("1.dat", memoryStream.ToArray());
答案 4 :(得分：18)
写入文件的组合答案可以是;
MemoryStream ms = new MemoryStream();
FileStream file = new FileStream("file.bin", FileMode.Create, FileAccess.Write);
ms.WriteTo(file);
file.Close();
ms.Close();
答案 5 :(得分：14)
为了加载文件，我更喜欢这个
MemoryStream ms = new MemoryStream();
using (FileStream fs = File.OpenRead(file))
{
fs.CopyTo(ms);
}
答案 6 :(得分：13)
保存到文件
Car car = new Car();
car.Name = "Some fancy car";
MemoryStream stream = Serializer.SerializeToStream(car);
System.IO.File.WriteAllBytes(fileName, stream.ToArray());
从文件加载
using (var stream = new MemoryStream(System.IO.File.ReadAllBytes(fileName)))
{
Car car = (Car)Serializer.DeserializeFromStream(stream);
}
，其中
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
namespace Serialization
{
public class Serializer
{
public static MemoryStream SerializeToStream(object o)
{
MemoryStream stream = new MemoryStream();
IFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, o);
return stream;
}
public static object DeserializeFromStream(MemoryStream stream)
{
IFormatter formatter = new BinaryFormatter();
stream.Seek(0, SeekOrigin.Begin);
object o = formatter.Deserialize(stream);
return o;
}
}
}
此类的实施最初已发布here
和
[Serializable]
public class Car
{
public string Name;
}
答案 7 :(得分：3)
我使用Panel Control添加图像甚至流视频，但您可以将图像保存为图像或MySQL largeblob 。这段代码对我很有帮助。看看吧。
在这里保存图像
MemoryStream ms = new MemoryStream();
Bitmap bmp = new Bitmap(panel1.Width, panel1.Height);
panel1.DrawToBitmap(bmp, panel1.Bounds);
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); // here you can change the Image format
byte[] Pic_arr = new byte[ms.Length];
ms.Position = 0;
ms.Read(Pic_arr, 0, Pic_arr.Length);
ms.Close();
在这里你可以加载，但我使用了PictureBox控件。
MemoryStream ms = new MemoryStream(picarr);
ms.Seek(0, SeekOrigin.Begin);
fotos.pictureBox1.Image = System.Drawing.Image.FromStream(ms);
答案 8 :(得分：1)
.csx用法：-
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
namespace ImageWriterUtil
{
public class ImageWaterMarkBuilder
{
//private ImageWaterMarkBuilder()
//{
//}
Stream imageStream;
string watermarkText = "©8Bytes.Technology";
Font font = new System.Drawing.Font("Brush Script MT", 30, FontStyle.Bold, GraphicsUnit.Pixel);
Brush brush = new SolidBrush(Color.Black);
Point position;
public ImageWaterMarkBuilder AddStream(Stream imageStream)
{
this.imageStream = imageStream;
return this;
}
public ImageWaterMarkBuilder AddWaterMark(string watermarkText)
{
this.watermarkText = watermarkText;
return this;
}
public ImageWaterMarkBuilder AddFont(Font font)
{
this.font = font;
return this;
}
public ImageWaterMarkBuilder AddFontColour(Color color)
{
this.brush = new SolidBrush(color);
return this;
}
public ImageWaterMarkBuilder AddPosition(Point position)
{
this.position = position;
return this;
}
public void CompileAndSave(string filePath)
{
//Read the File into a Bitmap.
using (Bitmap bmp = new Bitmap(this.imageStream, false))
{
using (Graphics grp = Graphics.FromImage(bmp))
{
//Determine the size of the Watermark text.
SizeF textSize = new SizeF();
textSize = grp.MeasureString(watermarkText, font);
//Position the text and draw it on the image.
if (position == null)
position = new Point((bmp.Width - ((int)textSize.Width + 10)), (bmp.Height - ((int)textSize.Height + 10)));
grp.DrawString(watermarkText, font, brush, position);
using (MemoryStream memoryStream = new MemoryStream())
{
//Save the Watermarked image to the MemoryStream.
bmp.Save(memoryStream, ImageFormat.Png);
memoryStream.Position = 0;
// string fileName = Path.GetFileNameWithoutExtension(filePath);
// outPuthFilePath = Path.Combine(Path.GetDirectoryName(filePath), fileName + "_outputh.png");
using (FileStream file = new FileStream(filePath, FileMode.Create, System.IO.FileAccess.Write))
{
byte[] bytes = new byte[memoryStream.Length];
memoryStream.Read(bytes, 0, (int)memoryStream.Length);
file.Write(bytes, 0, bytes.Length);
memoryStream.Close();
}
}
}
}
}
}
}