FileUpload.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / FileUpload.cs / 1305376 / FileUpload.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

// 
 

 


namespace System.Web.UI.WebControls {
 
    using System.ComponentModel;
    using System.IO; 
    using System.Text; 
    using System.Web.UI.HtmlControls;
 

    /// 
    /// Displays a text box and browse button that allows the user to select a file for uploading.
    ///  
    [ControlValueProperty("FileBytes")]
    [ValidationProperty("FileName")] 
    [Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign)] 
    public class FileUpload : WebControl {
 

        public FileUpload() : base(HtmlTextWriterTag.Input) {
        }
 
        /// 
        /// Gets the byte contents of the uploaded file.  Needed for ControlParameters and templatized 
        /// ImageFields. 
        /// 
        [ 
        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];
            }
        } 

 
        ///  
        /// Gets the contents of the uploaded file.
        ///  
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public Stream FileContent {
            get { 
                HttpPostedFile f = PostedFile; 
                if (f != null) {
                    return PostedFile.InputStream; 
                }

                return Stream.Null;
            } 
        }
 
 
        /// 
        /// The name of the file on the client's computer, not including the path. 
        /// 
        [
        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; 
            }
        } 


        /// 
        /// Whether or not a file was uploaded. 
        /// 
        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public bool HasFile {
            get {
                HttpPostedFile f = PostedFile;
 
                if (f != null) {
                    // 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 (f.ContentLength > 0); 
                }

                return false;
            } 
        }
 
 
        /// 
        /// Provides access to the underlying HttpPostedFile. 
        /// 
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public HttpPostedFile PostedFile { 
            get { 
                if (Page != null && Page.IsPostBack) {
                    return Context.Request.Files[UniqueID]; 
                }

                return null;
            } 
        }
 
 
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "file"); 
            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);
        } 


        /// 
        /// Initiates a utility method to save an uploaded file to disk. 
        /// 
        public void SaveAs(string filename) { 
            HttpPostedFile f = PostedFile; 
            if (f != null) {
                f.SaveAs(filename); 
            }
        }

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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FileUpload.cs source code in C# .NET

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