HttpHeaderCollection.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / HttpHeaderCollection.cs / 6 / HttpHeaderCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Collection of headers with write through to IIS for Set, Add, and Remove 
 *
 * Copyright (c) 2000 Microsoft Corporation 
 */

namespace System.Web {
    using System.Collections; 
    using System.Collections.Specialized;
    using System.Globalization; 
    using System.Security.Permissions; 
    using System.Runtime.Serialization;
    using System.Web.Hosting; 
    using System.Web.Util;

    [Serializable()]
    internal class HttpHeaderCollection : HttpValueCollection { 
        private HttpRequest _request;
        private HttpResponse _response; 
        private IIS7WorkerRequest _iis7WorkerRequest; 

 
        // This constructor creates the header collection for request headers.
        // Try to preallocate the base collection with a size that should be sufficient
        // to store the headers for most requests.
        internal HttpHeaderCollection(HttpWorkerRequest wr, HttpRequest request, int capacity) : base(capacity) { 

            // if this is an IIS7WorkerRequest, then the collection will be writeable and we will 
            // call into IIS7 to update the header blocks when changes are made. 
            _iis7WorkerRequest = wr as IIS7WorkerRequest;
 
            _request = request;
        }

        // This constructor creates the header collection for response headers. 
        // Try to preallocate the base collection with a size that should be sufficient
        // to store the headers for most requests. 
        internal HttpHeaderCollection(HttpWorkerRequest wr, HttpResponse response, int capacity) : base(capacity) { 

            // if this is an IIS7WorkerRequest, then the collection will be writeable and we will 
            // call into IIS7 to update the header blocks when changes are made.
            _iis7WorkerRequest = wr as IIS7WorkerRequest;

            _response = response; 
        }
 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] 
        public override void GetObjectData(SerializationInfo info, StreamingContext context) {
            // WOS 127340: Request.Headers and Response.Headers are no longer serializable 
            base.GetObjectData(info, context);
            // create an instance of HttpValueCollection since HttpHeaderCollection is tied to the request
            info.SetType(typeof(HttpValueCollection));
        } 

        public override void Add(String name, String value) { 
            if (_iis7WorkerRequest == null) { 
                throw new PlatformNotSupportedException();
            } 
            // append to existing value
            SetHeader(name, value, false /*replace*/);
        }
 
        public override void Clear() {
            throw new NotSupportedException(); 
        } 

        internal void ClearInternal() { 
            // clear is only supported for response headers
            if (_request != null) {
                throw new NotSupportedException();
            } 
            base.Clear();
        } 
 
        public override void Set(String name, String value) {
            if (_iis7WorkerRequest == null) { 
                throw new PlatformNotSupportedException();
            }
            // set new value
            SetHeader(name, value, true /*replace*/); 
        }
 
        internal void SetHeader(String name, String value, bool replace) { 
            Debug.Assert(_iis7WorkerRequest != null, "_iis7WorkerRequest != null");
 
            if (name == null) {
                throw new ArgumentNullException("name");
            }
 
            if (value == null) {
                throw new ArgumentNullException("value"); 
            } 

            if (_request != null) { 
                _iis7WorkerRequest.SetRequestHeader(name, value, replace);
            }
            else {
                if (_response.HeadersWritten) { 
                    throw new HttpException(SR.GetString(SR.Cannot_append_header_after_headers_sent));
                } 
 
                // set the header encoding to the selected encoding
                _iis7WorkerRequest.SetHeaderEncoding(_response.HeaderEncoding); 

                _iis7WorkerRequest.SetResponseHeader(name, value, replace);

                if (_response.HasCachePolicy && StringUtil.EqualsIgnoreCase("Set-Cookie", name)) { 
                    _response.Cache.SetHasSetCookieHeader();
                } 
            } 

            // update managed copy of header 
            if (replace) {
                base.Set(name, value);
            }
            else { 
                base.Add(name, value);
            } 
 
            if (_request != null) {
                // update managed copy of server variable 
                string svValue = replace ? value : base.Get(name);
                HttpServerVarsCollection serverVars = _request.ServerVariables as HttpServerVarsCollection;
                if (serverVars != null) {
                    serverVars.SynchronizeServerVariable("HTTP_" + name.ToUpper(CultureInfo.InvariantCulture).Replace('-', '_'), svValue); 
                }
 
                // invalidate Params collection 
                _request.InvalidateParams();
            } 
        }

        // updates managed copy of header with current value from native header block
        internal void SynchronizeHeader(String name, String value) { 
            if (name == null) {
                throw new ArgumentNullException("name"); 
            } 

            if (value != null) { 
                base.Set(name, value);
            }
            else {
                base.Remove(name); 
            }
 
            if (_request != null) { 
                _request.InvalidateParams();
            } 
        }

        public override void Remove(String name) {
            if (_iis7WorkerRequest == null) { 
                throw new PlatformNotSupportedException();
            } 
 
            if (name == null) {
                throw new ArgumentNullException("name"); 
            }

            if (_request != null) {
                // delete by sending null value 
                _iis7WorkerRequest.SetRequestHeader(name, null /*value*/, false /*replace*/);
            } 
            else { 
                _iis7WorkerRequest.SetResponseHeader(name, null /*value*/, false /*replace*/);
            } 

            base.Remove(name);
            if (_request != null) {
                // update managed copy of server variable 
                HttpServerVarsCollection serverVars = _request.ServerVariables as HttpServerVarsCollection;
                if (serverVars != null) { 
                    serverVars.SynchronizeServerVariable("HTTP_" + name.ToUpper(CultureInfo.InvariantCulture).Replace('-', '_'), null); 
                }
 
                // invalidate Params collection
                _request.InvalidateParams();
            }
        } 
    }
}
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HttpHeaderCollection.cs source code in C# .NET

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