ASP.NET中常用功能代码总结(4)——保存图片到XML文件
ASP.NET中常用功能代码总结(4)——保存图片到XML文件
整理:Terrylee
一.保存图片到XML文件
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/// <summary>
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/// 保存图片到XML文件
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/// </summary>
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private void UploadImageToXml()
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{
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///得到用户要上传的文件名
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string strFilePathName = loFile.PostedFile.FileName;
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string strFileName = Path.GetFileName(strFilePathName);
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int FileLength = loFile.PostedFile.ContentLength;
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if(FileLength<=0)
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return;
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try
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{
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///图象文件临时储存Byte数组
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Byte[] FileByteArray = new Byte[FileLength];
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///建立数据流对像
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Stream StreamObject = loFile.PostedFile.InputStream;
19![](https://terrylee.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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///读取图象文件数据,FileByteArray为数据储存体,0为数据指针位置、FileLnegth为数据长度
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StreamObject.Read(FileByteArray,0,FileLength);
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///要打开的文件
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string fileName = Server.MapPath(".\\WriteXml.xml");
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XmlDocument xmlDoc = new XmlDocument();
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xmlDoc.Load(fileName);
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///查找<dbGuest>
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XmlNode root=xmlDoc.SelectSingleNode("dbImage");
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XmlNodeList xnl=xmlDoc.SelectSingleNode("dbImage").ChildNodes;
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int nIndex = xnl.Count;
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///以下添加新结点
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XmlElement xe1=xmlDoc.CreateElement("Image");//创建一个<User>节点
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XmlElement xesub1=xmlDoc.CreateElement("ImageID");
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///设置文本节点
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xesub1.InnerText=nIndex.ToString();
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///添加到<User>节点中
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xe1.AppendChild(xesub1);
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XmlElement xesub2=xmlDoc.CreateElement("ImageContentType");
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xesub2.InnerText=loFile.PostedFile.ContentType;
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xe1.AppendChild(xesub2);
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XmlElement xesub3=xmlDoc.CreateElement("ImageSize");
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xesub3.InnerText=FileLength.ToString();
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xe1.AppendChild(xesub3);
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XmlElement xesub4=xmlDoc.CreateElement("ImageDescription");
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xesub4.InnerText=tbDescription.Text;
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xe1.AppendChild(xesub4);
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XmlElement xesub5=xmlDoc.CreateElement("ImageData");
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xesub5.InnerText= Convert.ToBase64String(FileByteArray);
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xe1.AppendChild(xesub5);
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///添加到<dbGuest>节点中
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root.AppendChild(xe1);
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xmlDoc.Save(fileName);
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Response.Redirect("ShowAllImg.aspx");
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}
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catch(Exception ex)
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{
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throw ex;
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}
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}
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二.从XML中读取图片数据
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/// <summary>
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/// 从XML中读取图片
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/// </summary>
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/// <param name="ImageID">图片ID</param>
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private void ReadImageFromXml(string ImageID)
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{
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///ID为图片ID
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int ImgID = Convert.ToInt32(ImageID);
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///要打开的文件
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string fileName = Server.MapPath(".\\WriteXml.xml");
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XmlDocument xmlDoc = new XmlDocument();
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xmlDoc.Load(fileName);
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XmlNodeList node = xmlDoc.SelectSingleNode("//Image[ImageID='"+ImgID.ToString()+"']").ChildNodes;
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if(node!=null)
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{
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string strType = node.Item(1).InnerText;
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string strData =node.Item(4).InnerText;
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int nSize = int.Parse(node.Item(2).InnerText);
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///设定输出文件类型
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Response.ContentType = strType;
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///输出图象文件二进制数制
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Response.OutputStream.Write(Convert.FromBase64String(strData), 0, nSize);
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Response.End();
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//也可以保存为图像
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//FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);
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//fs.Write((Convert.FromBase64String(strData), 0,nSize);
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//fs.Close();
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}
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}
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posted on 2005-12-02 11:16 Chandler.C 阅读(444) 评论(2) 编辑 收藏 举报