在上传按钮里写的方法:
protected void Button1_Click(object sender, EventArgs e)
{
try
{
string imgpath = Server.MapPath("~/image");//获取图片文件夹的路径
Random rd = new System.Random();
string fileFoldUrl;
string filepath;
string filename;
if (FileUpload1.PostedFile.FileName != "")
{
filename = DateTime.Now.Year.ToString() + DateTime.Now.Month + DateTime.Now.Day + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second+".jpg";//重新给图片写个名字
fileFoldUrl = Server.MapPath("~/image/");
filepath = Server.MapPath("~/image/") + filename;
FileUpload1.PostedFile.SaveAs(filepath);//保存图片
update_picture(fileFoldUrl, filename, filepath, 60, 60);//调下面重写图片大小的方法
}
}
catch {
}
}
/// <summary>
/// 修改指定图片的分辨率的方法
/// </summary>
/// <param name="fileFoldUrl">文件夹url </param>
/// <param name="fileName">文件名 </param>
/// <param name="filePath">文件路径，带文件名 </param>
/// <param name="_width">分辨率的宽 </param>
/// <param name="_height">分辨率的高 </param>
public void update_picture(string fileFoldUrl, string fileName, string filePath, int _width, int _height)
{
byte[] zp = this.load_pictMemory(filePath);
MemoryStream ms = new MemoryStream(zp);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
Bitmap btp = new Bitmap(img, _width, _height);
DirectoryInfo dti = new DirectoryInfo(fileFoldUrl);
FileInfo[] fis = dti.GetFiles();
string fileUrl = fileFoldUrl + fileName;
btp.Save(fileUrl);
}
/// <summary>
/// 获取指定文件流的字节大小
/// </summary>
/// <param name="filePath">文件路径 </param>
/// <returns>byte[] </returns>
public byte[] load_pictMemory(string filePath)
{
byte[] pictData = null;
FileInfo fi = new FileInfo(filePath);
if (fi.Exists)
{
pictData = new byte[fi.Length];
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
BinaryReader br = new BinaryReader(fs);
br.Read(pictData, 0, Convert.ToInt32(fi.Length));
fs.Dispose();
}
else
{
HttpContext.Current.Response.Write(" <script language='javascript'>alert('没有找到你所指定的图片') </script>");
}
return pictData;
}
//--------------------------------------------------------上面的代码可以直接用