{
if(!File.Exists(FilePath))
return null
Bitmap myBitmap = new Bitmap(Image.FromFile(FilePath))
using (MemoryStream curImageStream = new MemoryStream())
{
myBitmap.Save(curImageStream, System.Drawing.Imaging.ImageFormat.Png)
curImageStream.Flush()
byte[] bmpBytes = curImageStream.ToArray()
//如果转字符串的话
//string BmpStr = Convert.ToBase64String(bmpBytes)
return bmpBytes
}
}
下面有一段代码,在我一个项目里抽出来的,没有完全T出来,你应该看得懂了:%D%A Stream ms%D%Abyte[] picbyte%D%AOpenFileDialog ofdSelectPic = new OpenFileDialog()%D%AofdSelectPic.DefaultExt = "*.bmp*.jpg*.jpeg*.gif*.png"%D%AofdSelectPic.Filter = "*.jpg,*.gif,*.bmp,*.png,*.jpeg|*.jpg*.gif*.bmp*.png*.jpeg"%D%Aif (ofdSelectPic.ShowDialog() == DialogResult.OK)%D%A{%D%Aif ((ms = ofdSelectPic.OpenFile()) != null)%D%A{%D%Astring filepath = ofdSelectPic.FileName%D%A%D%Astring extension = Path.GetExtension(filepath)%D%Aif (extension == ".jpg" || extension == ".gif" || extension == ".bmp" || extension == ".jpeg" || extension == ".png")%D%A{%D%Aif (SelectImageIndex == 1)%D%A{%D%ApicSignature.Image = Image.FromFile(filepath)%D%A}%D%Aelse if (SelectImageIndex == 2)%D%A{%D%Apicphotoid1.Image = Image.FromFile(filepath)%D%A}%D%Aelse if (SelectImageIndex == 3)%D%A{%D%Apicphoto2.Image = Image.FromFile(filepath)%D%A}%D%A%D%Apicbyte = new byte[ms.Length]%D%Ams.Position = 0%D%Ams.Read(picbyte, 0, Convert.ToInt32(ms.Length))%D%Ams.Close()%D%Areturn picbyte%D%A}%D%Aelse%D%A{%D%AMessageBox.Show("you can only select the image type file!")%D%Areturn null%D%A}%D%A}%D%Aelse%D%A{%D%Areturn null%D%A}%D%A}%D%A%D%A那个SQL数据库里字段设置成image或者binary都行。通常对用户上传的图片需要保存到数据库中。解决方法一般有两种:一种是将图片保存的路径存储到数据库;另一种是将图片以二进制数据流的形式直接写入数据库字段中。以下为具体方法:一、保存图片的上传路径到数据库:
string uppath=""//用于保存图片上传路径
//获取上传图片的文件名
string fileFullname = this.FileUpload1.FileName
//获取图片上传的时间,以时间作为图片的名字可以防止图片重名
string dataName = DateTime.Now.ToString("yyyyMMddhhmmss")
//获取图片的文件名(不含扩展名)
string fileName = fileFullname.Substring(fileFullname.LastIndexOf("\\") + 1)
//获取图片扩展名
string type = fileFullname.Substring(fileFullname.LastIndexOf(".") + 1)
//判断是否为要求的格式
if (type == "bmp" || type == "jpg" || type == "jpeg" || type == "gif" || type == "JPG" || type == "JPEG" || type == "BMP" || type == "GIF")
{
//将图片上传到指定路径的文件夹
this.FileUpload1.SaveAs(Server.MapPath("~/upload") + "\\" + dataName + "." + type)
//将路径保存到变量,将该变量的值保存到数据库相应字段即可
uppath = "~/upload/" + dataName + "." + type
}
二、将图片以二进制数据流直接保存到数据库:
引用如下命名空间:
using System.Drawing
using System.IO
using System.Data.SqlClient
设计数据库时,表中相应的字段类型为iamge
保存:
//图片路径
string strPath = this.FileUpload1.PostedFile.FileName.ToString ()
//读取图片
FileStream fs = new System.IO.FileStream(strPath, FileMode.Open, FileAccess.Read)
BinaryReader br = new BinaryReader(fs)
byte[] photo = br.ReadBytes((int)fs.Length)
br.Close()
fs.Close()
//存入
SqlConnection myConn = new SqlConnection("Data Source=.Initial Catalog=stumanageUser ID=saPassword=123")
string strComm = " INSERT INTO stuInfo(stuid,stuimage) VALUES(107,@photoBinary )"// *** 作数据库语句根据需要修改
SqlCommand myComm = new SqlCommand(strComm, myConn)
myComm.Parameters.Add("@photoBinary", SqlDbType.Binary, photo.Length)
myComm.Parameters["@photoBinary"].Value = photo
myConn.Open()
if (myComm.ExecuteNonQuery() >0)
{
this.Label1.Text = "ok"
}
myConn.Close()
读取:
...连接数据库字符串省略
mycon.Open()
SqlCommand command = new
SqlCommand("select stuimage from stuInfo where stuid=107", mycon)//查询语句根据需要修改
byte[] image = (byte[])command.ExecuteScalar ()
//指定从数据库读取出来的图片的保存路径及名字
string strPath = "~/Upload/zhangsan.JPG"
string strPhotoPath = Server.MapPath(strPath)
//按上面的路径与名字保存图片文件
BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath,FileMode.OpenOrCreate))
bw.Write(image)
bw.Close()
//显示图片
this.Image1.ImageUrl = strPath
采用俩种方式可以根据实际需求灵活选择。
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