一個(gè)基于asp.net后臺(tái)上傳圖片的截取小功能

發(fā)布日期：2017年01月03日文章來源：www.ppeeidm.cn

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今天來講講關(guān)于后臺(tái)傳圖片的事情。一個(gè)網(wǎng)站完成了，可不是就結(jié)束了那么簡(jiǎn)單，需要維護(hù)，更新網(wǎng)站的內(nèi)容，這里就會(huì)需要涉及到圖片的上傳，可是有些時(shí)候，你需要使用的圖片不規(guī)范，導(dǎo)致前端顯示出來常常是圖片變形，或者是標(biāo)簽變形，所以這里有個(gè)功能在你上傳圖片的時(shí)候，讓你的圖片按照一定比例的進(jìn)行規(guī)范。話不多說了上代碼：

.cs代碼

<!--if (!string.IsNullOrEmpty(filePicURL1.FileName))

{

string temp = Maticsoft.Public.Public.FileUp(filePicURL1.FileName);

switch (temp)

{

case "圖片格式錯(cuò)誤！":

FineUI.Alert.Show("抱歉，圖片格式錯(cuò)誤！", "提示");

return;

}

//寫入

filePicURL1.SaveAs(Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["Pro"]) + temp);

string ImgFile = System.Web.HttpContext.Current.Server.MapPath("../../Upload/pro/" + temp + "");

//按照指定的數(shù)據(jù)畫出畫板（位圖）

System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);

//遮罩小頭像圖片的寬度

int PicWidth = 410;

int PicHeight = 303;

//遮罩小頭像圖片的高度

//當(dāng)圖片大于遮罩大小時(shí)

if (imgPhoto.Width / PicWidth != 0 || PicWidth < imgPhoto.Width)

{

PicHeight = imgPhoto.Height / (imgPhoto.Width / PicWidth);

}

//當(dāng)圖片小于遮罩大小時(shí)

if (PicWidth > imgPhoto.Width)

{

PicHeight = imgPhoto.Height * (PicWidth / imgPhoto.Width);

}

//剪切圖片寬度

int CutWidth = 410;

//剪切圖片高度

int CutHeight = 303;

//X坐標(biāo)imgPhoto.Height / PicHeight

int PointX = 0;

//Y坐標(biāo)

int PointY = 0;

Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

//創(chuàng)建畫筆并按照數(shù)據(jù)把指定的部分畫到畫板上

Graphics gbmPhoto = Graphics.FromImage(bmPhoto);

gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, CutWidth, CutHeight), PointX, PointY, CutWidth * imgPhoto.Width / PicWidth, CutHeight * imgPhoto.Height / PicHeight, GraphicsUnit.Pixel);

//把畫好的畫板保存到http數(shù)據(jù)流中

string imgName = Guid.NewGuid().ToString() + ".jpg";

icontents.PicURL = imgName;

string UploadPath = Server.MapPath("~/upload/pro/" + imgName);

bmPhoto.Save(UploadPath, System.Drawing.Imaging.ImageFormat.Jpeg);

//施放所有資源

imgPhoto.Dispose();

gbmPhoto.Dispose();

bmPhoto.Dispose();

//由于編輯的圖片必須先保存所以這里刪除原圖片

try

{

string FilePath = Server.MapPath("../../Upload/pro/" + temp + "");//轉(zhuǎn)換物理路徑

File.Delete(FilePath);//執(zhí)行IO文件刪除,需引入命名空間System.IO;

}

catch (Exception ex)

{

throw ex;

}

-->

這是我前端控件綁定的控件

<!--<ext:FormRow>

<Items>

<ext:FileUpload ID="filePicURL1" EmptyText="規(guī)格：410X303px" runat="server" Label="上傳/修改展示圖" Width="350">

</ext:FileUpload>

</Items>

</ext:FormRow>-->

如果有更多方法，歡迎在本站進(jìn)行討論。

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一個(gè)基于asp.net后臺(tái)上傳圖片的截取小功能