HttpPostedFile 获取当前页面提交的文件
来源：互联网 发布：2017年网络暴力案例 编辑：程序博客网 时间：2024/05/21 19:33
Asp.net WebForm 获取当前页面提交的所有文件的方法
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Context.Request.Files1
Context.Request.Files.GetMultiple(Context.Request.Files.Keys[0]);获取文件属性和保存文件
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for (int i = 0; i < Context.Request.Files.Count; i++) { var file = Context.Request.Files[i]; var length= file.ContentLength; var type = file.ContentType; var name = file.FileName; var stream = file.InputStream; file.SaveAs("filePath"); }We need to add <httpModules> to Web.config that make sure SaveAs Method can work
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<system.web><httpRuntime executionTimeout="500" maxRequestLength="153600" requestLengthDiskThreshold="153600"/></system.web>
FileUpload 源码中的SaveAs 也使用 Context.Request.Files 的SaveAs()：
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//------------------------------------------------------------------------------// <copyright file="FileUpload.cs" company="Microsoft">// Copyright (c) Microsoft Corporation. All rights reserved.// </copyright>//------------------------------------------------------------------------------ // namespace System.Web.UI.WebControls { using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Linq; using System.IO; using System.Text; using System.Web.UI.HtmlControls; /// <devdoc> /// Displays a text box and browse button that allows the user to select a file for uploading. /// </devdoc> [ControlValueProperty("FileBytes")] [ValidationProperty("FileName")] [Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign)] public class FileUpload : WebControl { private static readonly IList<HttpPostedFile> _emptyFileCollection = new HttpPostedFile[0]; private IList<HttpPostedFile> _postedFiles; public FileUpload() : base(HtmlTextWriterTag.Input) { } [ Browsable(true), DefaultValue(false), WebCategory("Behavior"), WebSysDescription(SR.FileUpload_AllowMultiple) ] public virtual bool AllowMultiple { get { object o = ViewState["AllowMultiple"]; return (o != null) ? (bool)o : false; } set { ViewState["AllowMultiple"] = value; } } /// <devdoc> /// Gets the byte contents of the uploaded file. Needed for ControlParameters and templatized /// ImageFields. /// </devdoc> [ Bindable(true), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public byte[] FileBytes { get { Stream fileStream = FileContent; if (fileStream != null && fileStream != Stream.Null) { long fileStreamLength = fileStream.Length; BinaryReader reader = new BinaryReader(fileStream); Byte[] completeImage = null; if (fileStreamLength > Int32.MaxValue) { throw new HttpException(SR.GetString(SR.FileUpload_StreamTooLong)); } if (!fileStream.CanSeek) { throw new HttpException(SR.GetString(SR.FileUpload_StreamNotSeekable)); } int currentStreamPosition = (int)fileStream.Position; int fileStreamIntLength = (int)fileStreamLength; try { fileStream.Seek(0, SeekOrigin.Begin); completeImage = reader.ReadBytes(fileStreamIntLength); } finally { // Don't close or dispose of the BinaryReader because doing so would close the stream. // We want to put the stream back to the original position in case this getter is called again // and the stream supports seeking, the bytes will be returned again. fileStream.Seek(currentStreamPosition, SeekOrigin.Begin); } if (completeImage.Length != fileStreamIntLength) { throw new HttpException(SR.GetString(SR.FileUpload_StreamLengthNotReached)); } return completeImage; } return new byte[0]; } } /// <devdoc> /// Gets the contents of the uploaded file. /// </devdoc> [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public Stream FileContent { get { HttpPostedFile f = PostedFile; if (f != null) { return PostedFile.InputStream; } return Stream.Null; } } /// <devdoc> /// The name of the file on the client's computer, not including the path. /// </devdoc> [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public string FileName { get { HttpPostedFile postedFile = PostedFile; string fileName = string.Empty; if (postedFile != null) { string fullFileName = postedFile.FileName; try { // Some browsers (IE 6, Netscape 4) return the fully-qualified filename, // like "C:\temp\foo.txt". The application writer is probably not interested // in the client path, so we just return the filename part. fileName = Path.GetFileName(fullFileName); } catch { fileName = fullFileName; } } return fileName; } } /// <devdoc> /// Whether or not a file was uploaded. /// </devdoc> [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public bool HasFile { get { // Unfortunately returns false if a 0-byte file was uploaded, since we see a 0-byte // file if the user entered nothing, an invalid filename, or a valid filename // of a 0-byte file. We feel this scenario is uncommon. HttpPostedFile f = PostedFile; return f != null && f.ContentLength > 0; } } /// <devdoc> /// Whether or not at least 1 non-0-length file was uploaded. /// </devdoc> [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public bool HasFiles { get { // Unfortunately returns false if a 0-byte file was uploaded, since we see a 0-byte // file if the user entered nothing, an invalid filename, or a valid filename // of a 0-byte file. We feel this scenario is uncommon. return PostedFiles.Any(f => f.ContentLength > 0); } } /// <devdoc> /// Provides access to the underlying HttpPostedFile. /// </devdoc> [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public HttpPostedFile PostedFile { get { if (Page != null && Page.IsPostBack) { return Context.Request.Files[UniqueID]; } return null; } } [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public IList<HttpPostedFile> PostedFiles { get { if (_postedFiles == null) { IList<HttpPostedFile> result = _emptyFileCollection; if (Page != null && Page.IsPostBack) { result = Context.Request.Files.GetMultiple(UniqueID); Debug.Assert(result != null); } _postedFiles = result; } return _postedFiles; } } protected override void AddAttributesToRender(HtmlTextWriter writer) { writer.AddAttribute(HtmlTextWriterAttribute.Type, "file"); if (AllowMultiple) { writer.AddAttribute(HtmlTextWriterAttribute.Multiple, "multiple"); } string uniqueID = UniqueID; if (uniqueID != null) { writer.AddAttribute(HtmlTextWriterAttribute.Name, uniqueID); } base.AddAttributesToRender(writer); } protected internal override void OnPreRender(EventArgs e) { base.OnPreRender(e); HtmlForm form = Page.Form; if (form != null && form.Enctype.Length == 0) { form.Enctype = "multipart/form-data"; } } protected internal override void Render(HtmlTextWriter writer) { // Make sure we are in a form tag with runat=server. if (Page != null) { Page.VerifyRenderingInServerForm(this); } base.Render(writer); } /// <devdoc> /// Initiates a utility method to save an uploaded file to disk. /// </devdoc> public void SaveAs(string filename) { HttpPostedFile f = PostedFile; if (f != null) { f.SaveAs(filename); } } }}阅读全文
