ASP.NET(c#)文件下载函数
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/// <summary>
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/// 下载文件函数
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/// </summary>
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/// <param name="url">下载地址</param>
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/// <param name="Path">保存路径</param>
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/// <param name="typeName">类型:文件或图片</param>
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private bool DownFile(string url, string Path,string typeName)
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{
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try
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{
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HttpWebRequest objHttpWebRequest;
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HttpWebResponse objHttpWebResponse;
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try
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{
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objHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);//send
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objHttpWebResponse = (HttpWebResponse)objHttpWebRequest.GetResponse();//get
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objHttpWebRequest.AllowAutoRedirect = true;
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}
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catch
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{
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return false;
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}
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string AbsoluteUri = objHttpWebResponse.ResponseUri.AbsoluteUri;//It may be Redirect so is necessary to use the AbsoluteUri
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string Extend = AbsoluteUri.Substring(AbsoluteUri.LastIndexOf(".") + 1);
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string GuidName = Guid.NewGuid().ToString();
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Path = Path + GuidName.Substring(0, 1);
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DirectoryInfo objDirectoryInfo = new DirectoryInfo(Path);
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if (objDirectoryInfo.Exists)
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{
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}
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else
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{
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objDirectoryInfo.Create();
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}
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string FullName = Path + "\\" + GuidName + "." + Extend;
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Stream objStream = objHttpWebResponse.GetResponseStream();
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Byte[] buffer = new Byte[256];
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int bufferSizeCount = objStream.Read(buffer, 0, 256);
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FileStream objFileStream = new FileStream(FullName, FileMode.Create, FileAccess.Write);
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int sumBufferSizeCount = 0;
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while (bufferSizeCount > 0)
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{
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Application.DoEvents();
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objFileStream.Write(buffer, 0, bufferSizeCount);//
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bufferSizeCount = objStream.Read(buffer, 0, 256);//
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sumBufferSizeCount += bufferSizeCount;//
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this.Text = string.Format("[总进度{0}/{1}] 下载进度{2}文件:{3}K {4}",currentIndex,totalCount, Extend, sumBufferSizeCount / 1024,sumBufferSizeCount);
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}
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objStream.Close();
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objFileStream.Close();
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objHttpWebResponse.Close();
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FileInfo objFileInfo = new FileInfo(FullName);
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int FileSize = Convert.ToInt32(objFileInfo.Length / 1024);
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if (typeName == "image")
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{
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ImageFileName = GuidName;
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ImageExtend = Extend;
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ImageFileSize = FileSize;
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if (File.Exists(FullName))
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{
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System.Drawing.Image image = System.Drawing.Image.FromFile(FullName);
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this.pictureBox1.Image = image;
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}
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}
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else if(typeName == "file")
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{
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FileFileName = GuidName;
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FileExtend = Extend;
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FileFileSize = FileSize;
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}
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this.Refresh();
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return true;
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}
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catch
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{
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return false;
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}
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}
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