c#上传图片

最新推荐文章于 2025-08-11 22:14:14 发布

原创最新推荐文章于 2025-08-11 22:14:14 发布 · 3.3k 阅读

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#c# #string #null #upload #server #object

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upload.aspx

<%@ Page CodeBehind="upload.aspx.cs" Language="c#" AutoEventWireup="false" Inherits="playershow.upload" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

<HTML>

<HEAD>

</HEAD>

<body>

<tr>

截图上传：</td>

</tr>

<tr>

<td><span class="style5"> ［尺寸必须为宽400×300像素；图片大小300K以内］ </span></td>

</tr>

<tr>

<asp:ImageButton id="ImageButton1" runat="server" ImageUrl="images/frame-08.gif"></asp:ImageButton></div>

</td>

</tr>

</table>

</form>

</TBODY></TABLE>

</body>

</HTML>

upload.aspx.cs

using System;

using System.Collections;

using System.ComponentModel;

using System.Web.UI.HtmlControls;

using System.Data;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Web;

using System.Configuration;

using System.IO;

using System.Data.SqlClient;

namespace playershow

{

/// <summary>

/// screenshots_upload 的摘要说明。

/// </summary>

public class screenshots_upload : System.Web.UI.Page

{

protected System.Web.UI.WebControls.RadioButtonList DbArea;

protected System.Web.UI.HtmlControls.HtmlInputFile MyFile;

protected System.Web.UI.WebControls.TextBox PhotoRemark;

protected System.Web.UI.WebControls.ImageButton ImageButton1;

protected System.Web.UI.WebControls.RadioButtonList PicXiaoType;

protected System.Web.UI.WebControls.TextBox PhotoTitle;

private void Page_Load(object sender, System.EventArgs e)

{

}

Web 窗体设计器生成的代码

private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)

{

string FileName;

FileName="";

if (!upimgtoserver(MyFile,ref FileName))

{

string jsClient = "<script language=javascript>alert('"+FileName+"');</script>";

this.RegisterStartupScript("s1",jsClient);

return;

}

else

{

return;

}

/// <summary>

/// 文件上传函数

/// </summary>

/// <param name="file">文件控件的名称</param>

private bool upimgtoserver(HtmlInputFile file ,ref string FileName)

{

string FilePath =file.PostedFile.FileName;

if(FilePath == "" || FilePath == null)

{

FileName="请选择一个文件。";

return false;

}

if (!filetype(file.PostedFile.ContentType))

{

FileName="您上传的文件类型无效，支持的上传文件类型：jpg,jpeg,gif,bmp,png,tiff";

return false;

}

int intLen=file.PostedFile.ContentLength;

if(intLen>1240*300)

{

FileName="您上传的文件超过300K，请您重新上传";

return false;

}

//保存到服务器上的绝对路径和文件名

try

{

addml();

FileName=fliename();

Stream ImageStream = file.PostedFile.InputStream;

Image sImage = Image.FromStream(ImageStream); // 从 Http 输入流创建 image

int kkkk=0;

string syt="UPimg/logo2.png";

if(sImage.Height/sImage.Width<=0.75)

{

if (sImage.Height>=240)

{

kkkk=1;

}

else

{

if(sImage.Width>=320)

{

kkkk=1;

}

if (kkkk==1)

{

syt="UPimg/logo.png";

}

string wImageFile = Server.MapPath(syt); // 要加的水印图

Image wImage = Image.FromFile(wImageFile);

// 绘图

Bitmap bitmap = new Bitmap(sImage.Width, sImage.Height, PixelFormat.Format32bppArgb);

Graphics g = Graphics.FromImage(bitmap);

g.Clear(Color.Transparent);

g.DrawImage(sImage, new Rectangle(0, 0, sImage.Width, sImage.Height));

//Graphics g = Graphics.FromImage(sImage);

g.DrawImage(wImage, new Rectangle(sImage.Width-wImage.Width, sImage.Height-wImage.Height, wImage.Width, wImage.Height),0, 0, wImage.Width, wImage.Height, GraphicsUnit.Pixel);

// 保存，并将 image 转化为 byte[]

MemoryStream ms=new MemoryStream();

bitmap.Save(ms, ImageFormat.Jpeg);

FileName=fliename()+".jpg";

ms.GetBuffer();

FileStream f = new FileStream(Server.MapPath("upImg/daPic") + "/" + FileName, FileMode.Create);

///把内内存里的数据写入物理文件

ms.WriteTo(f);

ms.Close();

f.Close();

f = null;

ms = null;

bitmap.Dispose();

Bitmap bitmap2 = new Bitmap(120, 90, PixelFormat.Format32bppArgb);

Graphics g2 = Graphics.FromImage(bitmap2);

g2.Clear(Color.Transparent);

g2.DrawImage(sImage, new Rectangle(0, 0, 120, 90));

MemoryStream ms2=new MemoryStream();

bitmap2.Save(ms2, ImageFormat.Jpeg);

ms2.GetBuffer();

FileStream f2 = new FileStream(Server.MapPath("upImg/xiaoPic") + "/" + FileName, FileMode.Create);

///把内内存里的数据写入物理文件

ms2.WriteTo(f2);

ms2.Close();

f2.Close();

f2 = null;

ms2 = null;

bitmap2.Dispose();

sImage.Dispose();

return true;

}

catch(Exception ex)

{

FileName =ex.ToString();

}

return false;

}

/// <summary>

/// 返回一个带有路径的文件名

/// </summary>

/// <returns>返回一个字符串</returns>

private string fliename()

{

DateTime now =DateTime.Now;

string ml=now.ToString("yyyyMMdd");

string newname=now.ToString("yyyyMMddhhmmss");

string lmname=now.ToString("yyyy-MM");

Random a =new Random();

int s=Convert.ToInt32(a.NextDouble()*100000+100000);

return lmname+"/"+newname+ s.ToString();

}

/// <summary>

/// 判断目录是否存在

/// 如果不存在则创建目录；

/// </summary>

private void addml()

{

DateTime now =DateTime.Now;

string lmname=now.ToString("yyyy-MM");

if (!Directory.Exists(Server.MapPath("upImg/xiaoPic")+"/"+lmname))

{

Directory.CreateDirectory(Server.MapPath("upImg/xiaoPic")+"/"+lmname);

}

if (!Directory.Exists(Server.MapPath("upImg/daPic")+"/"+lmname))

{

Directory.CreateDirectory(Server.MapPath("upImg/daPic")+"/"+lmname);

}

private bool filetype(string type)

{

bool s=false;

string[] wjlx={"image/jpeg","image/pjpeg","image/png","image/tiff","image/gif","image/bmp"};

for(int i=0;i<= wjlx.Length-1;i++)

{

if (wjlx[i]==type)

{

s=true;

break;

}

return s;

}