摘要：
第二种方式直接把图片的Base64String码进行存取这种方法很方便，直接转化一下就行了，不需要书写很麻烦的路经问题，先看一下是怎么存储到数据库的吧：//选择图片privatevoidbutton1_Click{OpenFileDialogopenfile=newOpenFileDialog();openfile.Title="请选择客户端longin的图片";openfile.Filter="Login图片|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";if{try{Bitmapbmp=newBitmap;pictureBox1.Image=bmp;pictureBox1.SizeMode=PictureBoxSizeMode.Zoom;MemoryStreamms=newMemoryStream();bmp.Save;byte[]arr=newbyte[ms.Length];ms.Position=0;ms.Read;ms.Close();//直接返这个值放到数据就行了pic=Convert.ToBase64String;}catch{}}}读取的方法也很简单，pic就是我们得到的图片字符串只要我们存储到数据库里，从下面的方法里读取就可以了。
///<summary>///上传图片
///</summary>///<param name="FUSShopURL"& gt;FileUpload对象</param>///<param name="UpladURL">图片要放到的目录名称</param>///<returns>如果FileUpload不为空则返回上传后的图片位置，否则返回为空字符</returns>publicstaticstringuploadImage(FileUpload FUSShopURL, stringUpladURL)
{
if(FUSShopURL.HasFile)
{
//获取当前的时间，一当作图片的名字stringfileName =DateTime.Now.ToString("yyyyMMddhhmmss") +DateTime.Now.Millisecond.ToString();
//获取图片的扩展名stringExtent =System.IO.Path.GetExtension(FUSShopURL.PostedFile.FileName);
//重命名图片fileName +=Extent;
//设置上传图片保存的文件夹stringdir =System.Web.HttpContext.Current.Server.MapPath(UpladURL);
//指定图片的路径及文件名stringpath =dir +"\\"+fileName;
//把上传得图片保存到指定的文件加中FUSShopURL.PostedFile.SaveAs(path);
returnfileName;
}
else
{
return"";
}
}
///</summary>///<param name="FUSShopURL"& gt;FileUpload对象</param>///<param name="UpladURL">图片要放到的目录名称</param>///<returns>如果FileUpload不为空则返回上传后的图片位置，否则返回为空字符</returns>publicstaticstringuploadImage(FileUpload FUSShopURL, stringUpladURL)
{
if(FUSShopURL.HasFile)
{
//获取当前的时间，一当作图片的名字stringfileName =DateTime.Now.ToString("yyyyMMddhhmmss") +DateTime.Now.Millisecond.ToString();
//获取图片的扩展名stringExtent =System.IO.Path.GetExtension(FUSShopURL.PostedFile.FileName);
//重命名图片fileName +=Extent;
//设置上传图片保存的文件夹stringdir =System.Web.HttpContext.Current.Server.MapPath(UpladURL);
//指定图片的路径及文件名stringpath =dir +"\\"+fileName;
//把上传得图片保存到指定的文件加中FUSShopURL.PostedFile.SaveAs(path);
returnfileName;
}
else
{
return"";
}
}
这个方法是与FileUpload控件 一起使用的，方法很简单大家一看就明白了。方法返回的就是一个相对的路经可以直接存储的数据里，然后从前台调用就可以了。
第二种方式 直接把图片的Base64String码进行存取
这种方法很方便，直接转化一下就行了，不需要书写很麻烦的路经问题，先看一下是怎么存储到数据库的吧：
//选择图片privatevoidbutton1_Click(objectsender, EventArgs e)
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
Bitmap bmp =newBitmap(openfile.FileName);
pictureBox1.Image =bmp;
pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
MemoryStream ms =newMemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
byte[] arr =newbyte[ms.Length];
ms.Position =0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
//直接返这个值放到数据就行了pic =Convert.ToBase64String(arr);
}
catch{ }
}
}
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
Bitmap bmp =newBitmap(openfile.FileName);
pictureBox1.Image =bmp;
pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
MemoryStream ms =newMemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
byte[] arr =newbyte[ms.Length];
ms.Position =0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
//直接返这个值放到数据就行了pic =Convert.ToBase64String(arr);
}
catch{ }
}
}
读取的方法也很简单， pic就是我们得到的图片字符串只要我们存储到数据库里，从下面的方法里读取就可以了。需要注意的地方我都加的有注释：
//加载图片privatevoidForm1_Load(objectsender, EventArgs e)
{
try
{
//pic=........这一句换成从数据库里读取就可以了
//判断是否为空，为空时的不执行if(!string.IsNullOrEmpty(pic))
{
//直接返Base64码转成数组byte[] imageBytes =Convert.FromBase64String(pic);
//读入MemoryStream对象MemoryStream memoryStream =newMemoryStream(imageBytes, 0,imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
//转成图片Image image =Image.FromStream(memoryStream);
//memoryStream.Close(); //不要加上这一句否则就不对了
//将图片放置在 PictureBox 中this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
this.pictureBox1.Image =image;
}
}
catch{ }
}
{
try
{
//pic=........这一句换成从数据库里读取就可以了
//判断是否为空，为空时的不执行if(!string.IsNullOrEmpty(pic))
{
//直接返Base64码转成数组byte[] imageBytes =Convert.FromBase64String(pic);
//读入MemoryStream对象MemoryStream memoryStream =newMemoryStream(imageBytes, 0,imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
//转成图片Image image =Image.FromStream(memoryStream);
//memoryStream.Close(); //不要加上这一句否则就不对了
//将图片放置在 PictureBox 中this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
this.pictureBox1.Image =image;
}
}
catch{ }
}
大家看一下效果吧：
在这里我们只要单击选择图片直接就可以更换。这些很简单但是我个人感觉还是很常用的，而且网上关于这块的例子着实不少，不过真正能帮上忙的还真不多，因为我们的好几个项目里用到了这些方法，或多或少的还是有些员工不怎么会， 在这里贴一贴方便新手查看吧。
下面的本例子的所有代码：
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.IO;
usingSystem.Threading;
namespaceWindowsFormsApplication1
{
publicpartialclassForm1 : Form
{
publicForm1()
{
InitializeComponent();
}
stringpic ="";
//加载图片privatevoidForm1_Load(objectsender, EventArgs e)
{
try
{
if(!string.IsNullOrEmpty(pic))
{
byte[] imageBytes =Convert.FromBase64String(pic);
MemoryStream memoryStream =newMemoryStream(imageBytes, 0, imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
Image image =Image.FromStream(memoryStream);
//将图片放置在 PictureBox 中this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
this.pictureBox1.Image =image;
}
}
catch{ }
}
//选择图片privatevoidbutton1_Click(objectsender, EventArgs e)
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
Bitmap bmp =newBitmap(openfile.FileName);
pictureBox1.Image =bmp;
pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
MemoryStream ms =newMemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
byte[] arr =newbyte[ms.Length];
ms.Position =0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
pic =Convert.ToBase64String(arr);
}
catch{ }
}
}
}
}
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.IO;
usingSystem.Threading;
namespaceWindowsFormsApplication1
{
publicpartialclassForm1 : Form
{
publicForm1()
{
InitializeComponent();
}
stringpic ="";
//加载图片privatevoidForm1_Load(objectsender, EventArgs e)
{
try
{
if(!string.IsNullOrEmpty(pic))
{
byte[] imageBytes =Convert.FromBase64String(pic);
MemoryStream memoryStream =newMemoryStream(imageBytes, 0, imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
Image image =Image.FromStream(memoryStream);
//将图片放置在 PictureBox 中this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
this.pictureBox1.Image =image;
}
}
catch{ }
}
//选择图片privatevoidbutton1_Click(objectsender, EventArgs e)
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
Bitmap bmp =newBitmap(openfile.FileName);
pictureBox1.Image =bmp;
pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
MemoryStream ms =newMemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
byte[] arr =newbyte[ms.Length];
ms.Position =0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
pic =Convert.ToBase64String(arr);
}
catch{ }
}
}
}
}
第三种方式 读成二进制后进行存取
先把图片读成二进制以后再做处理，这样快捷而且代码相对少很多，还有就是感谢下面几位网友的提醒和建议，在这里我把我简单写的代码贴一下，怎么样存储到数据库的方法还是大家自己写我只提供存取的方法：
privatevoidbutton1_Click(objectsender, EventArgs e)
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
//读成二进制byte[] bytes =File.ReadAllBytes(openfile.FileName);
//直接返这个存储到数据就行了 cmd.Parameters.Add("@image", SqlDbType.Image).Value = bytes;
//输出二进制 在这里把数据中取到的值放在这里byte[] bytes=(byte[])model.image;pictureBox1.Image =System.Drawing.Image.FromStream(newMemoryStream(bytes));
this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
//如果保存成文件：File.WriteAllBytes(@"d:\text.jpg", bytes);
}
catch{ }
}
}
{
OpenFileDialog openfile =newOpenFileDialog();
openfile.Title ="请选择客户端longin的图片";
openfile.Filter ="Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
if(DialogResult.OK ==openfile.ShowDialog())
{
try
{
//读成二进制byte[] bytes =File.ReadAllBytes(openfile.FileName);
//直接返这个存储到数据就行了 cmd.Parameters.Add("@image", SqlDbType.Image).Value = bytes;
//输出二进制 在这里把数据中取到的值放在这里byte[] bytes=(byte[])model.image;pictureBox1.Image =System.Drawing.Image.FromStream(newMemoryStream(bytes));
this.pictureBox1.SizeMode =PictureBoxSizeMode.Zoom;
//如果保存成文件：File.WriteAllBytes(@"d:\text.jpg", bytes);
}
catch{ }
}
}