HttpPostedFile 获取当前页面提交的文件

Asp.net WebForm 获取当前页面提交的所有文件的方法

1	Context.Request.Files

1	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);             }         }        } }