protected void UpLoadPhoto_Click(object sender, ImageClickEventArgs e)
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // 客戶端文件路徑
FileInfo file = new FileInfo(name);
string fileName = file.Name; // 文件名稱
string fileName_s = "s_" + file.Name; // 縮略圖文件名稱
string webFilePath = Server.MapPath("file/" + fileName); // 服務器端文件路徑
string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服務器端縮略圖路徑
if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
MakeThumbnail(webFilePath, webFilePath_s, 100, 100, "Cut"); // 生成縮略圖方法
ScriptManager.RegisterStartupScript(UpdatePanel1, typeof(UpdatePanel), "scriptname", "alert('文件上傳成功!')", true);
//this.RegisterStartupScript("hello", "<script>alert('文件上傳成功!')</script>");
Tools.AddLog("0", "上傳照片成功信息成功!");
imgPhoto.Visible = true;
imgPhoto.ImageUrl = webFilePath_s;
PhotoUrl = webFilePath_s;
}
catch (Exception ex)
{
Tools.AddLog("1", "上傳照片成功信息失敗!");
throw new Exception("提示:文件上傳失敗,失敗原因" + ex.Message);
}
}
else
{
this.RegisterStartupScript("hello", "<script>alert('圖片已經存在,請重命名後上傳!')</script>");
}
}
else
{
this.RegisterStartupScript("hello", "<script>alert('文件類型不符!')</script>");
}
}
else
{
ScriptManager.RegisterStartupScript(UpdatePanel1, typeof(UpdatePanel), "scriptname", "alert('請選擇照片!')", true);
}
}
/**/
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="originalImagePath">源圖路徑(物理路徑)</param>
/// <param name="thumbnailPath">縮略圖路徑(物理路徑)</param>
/// <param name="width">縮略圖寬度</param>
/// <param name="height">縮略圖高度</param>
/// <param name="mode">生成縮略圖的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高寬縮放(可能變形)
break;
case "W"://指定寬,高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高,寬按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高寬裁減(不變形)
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一個bmp圖片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一個畫板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//設置高質量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設置高質量,低速度呈現平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布並以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置並且按指定大小繪製原圖片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
//以jpg格式保存縮略圖
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}