HttpValueCollection.cs source code in C# .NET

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

/* 
 * Ordered String/String[] collection of name/value pairs 
 * Based on NameValueCollection -- adds parsing from string, cookie collection
 * 
 * Copyright (c) 2000 Microsoft Corporation
 */

namespace System.Web { 
    using System.Runtime.Serialization;
    using System.Runtime.Serialization.Formatters; 
    using System.Text; 
    using System.Runtime.InteropServices;
 
    using System.Collections;
    using System.Collections.Specialized;
    using System.Globalization;
    using System.Web.Util; 
    using System.Web.UI;
 
    [Serializable()] 
    internal class HttpValueCollection : NameValueCollection {
        internal HttpValueCollection(): base(StringComparer.OrdinalIgnoreCase) { 
        }

        internal HttpValueCollection(String str, bool readOnly, bool urlencoded, Encoding encoding): base(StringComparer.OrdinalIgnoreCase) {
            if (!String.IsNullOrEmpty(str)) 
                FillFromString(str, urlencoded, encoding);
 
            IsReadOnly = readOnly; 
        }
 
        internal HttpValueCollection(int capacity) : base(capacity, StringComparer.OrdinalIgnoreCase) {
        }

        protected HttpValueCollection(SerializationInfo info, StreamingContext context) : base(info, context) { 
        }
 
        internal void MakeReadOnly() { 
            IsReadOnly = true;
        } 

        internal void MakeReadWrite() {
            IsReadOnly = false;
        } 

        internal void FillFromString(String s) { 
            FillFromString(s, false, null); 
        }
 
        internal void FillFromString(String s, bool urlencoded, Encoding encoding) {
            int l = (s != null) ? s.Length : 0;
            int i = 0;
 
            while (i < l) {
                // find next & while noting first = on the way (and if there are more) 
 
                int si = i;
                int ti = -1; 

                while (i < l) {
                    char ch = s[i];
 
                    if (ch == '=') {
                        if (ti < 0) 
                            ti = i; 
                    }
                    else if (ch == '&') { 
                        break;
                    }

                    i++; 
                }
 
                // extract the name / value pair 

                String name = null; 
                String value = null;

                if (ti >= 0) {
                    name = s.Substring(si, ti-si); 
                    value = s.Substring(ti+1, i-ti-1);
                } 
                else { 
                    value = s.Substring(si, i-si);
                } 

                // add name / value pair to the collection

                if (urlencoded) 
                    base.Add(
                       HttpUtility.UrlDecode(name, encoding), 
                       HttpUtility.UrlDecode(value, encoding)); 
                else
                    base.Add(name, value); 

                // trailing '&'

                if (i == l-1 && s[i] == '&') 
                    base.Add(null, String.Empty);
 
                i++; 
            }
        } 

        internal void FillFromEncodedBytes(byte[] bytes, Encoding encoding) {
            int l = (bytes != null) ? bytes.Length : 0;
            int i = 0; 

            while (i < l) { 
                // find next & while noting first = on the way (and if there are more) 

                int si = i; 
                int ti = -1;

                while (i < l) {
                    byte b = bytes[i]; 

                    if (b == '=') { 
                        if (ti < 0) 
                            ti = i;
                    } 
                    else if (b == '&') {
                        break;
                    }
 
                    i++;
                } 
 
                // extract the name / value pair
 
                String name, value;

                if (ti >= 0) {
                    name  = HttpUtility.UrlDecode(bytes, si, ti-si, encoding); 
                    value = HttpUtility.UrlDecode(bytes, ti+1, i-ti-1, encoding);
                } 
                else { 
                    name = null;
                    value = HttpUtility.UrlDecode(bytes, si, i-si, encoding); 
                }

                // add name / value pair to the collection
 
                base.Add(name, value);
 
                // trailing '&' 

                if (i == l-1 && bytes[i] == '&') 
                    base.Add(null, String.Empty);

                i++;
            } 
        }
 
        internal void Add(HttpCookieCollection c) { 
            int n = c.Count;
 
            for (int i = 0; i < n; i++) {
                HttpCookie cookie = c.Get(i);
                base.Add(cookie.Name, cookie.Value);
            } 
        }
 
        internal void Reset() { 
            base.Clear();
        } 

        public override String ToString() {
            return ToString(true);
        } 

        internal virtual String ToString(bool urlencoded) { 
            return ToString(urlencoded, null); 
        }
 
        internal virtual String ToString(bool urlencoded, IDictionary excludeKeys) {
            int n = Count;
            if (n == 0)
                return String.Empty; 

            StringBuilder s = new StringBuilder(); 
            String key, keyPrefix, item; 
            bool ignoreViewStateKeys = (excludeKeys != null && excludeKeys[Page.ViewStateFieldPrefixID] != null);
 
            for (int i = 0; i < n; i++) {
                key = GetKey(i);

                // Review: improve this... Special case hack for __VIEWSTATE# 
                if (ignoreViewStateKeys && key != null && key.StartsWith(Page.ViewStateFieldPrefixID, StringComparison.Ordinal)) continue;
                if (excludeKeys != null && key != null && excludeKeys[key] != null) 
                    continue; 
                if (urlencoded)
                    key = HttpUtility.UrlEncodeUnicode(key); 
                keyPrefix = (key != null) ? (key + "=") : String.Empty;

                ArrayList values = (ArrayList)BaseGet(i);
                int numValues = (values != null) ? values.Count : 0; 

                if (s.Length > 0) 
                    s.Append('&'); 

                if (numValues == 1) { 
                    s.Append(keyPrefix);
                    item = (String)values[0];
                    if (urlencoded)
                        item = HttpUtility.UrlEncodeUnicode(item); 
                    s.Append(item);
                } 
                else if (numValues == 0) { 
                    s.Append(keyPrefix);
                } 
                else {
                    for (int j = 0; j < numValues; j++) {
                        if (j > 0)
                            s.Append('&'); 
                        s.Append(keyPrefix);
                        item = (String)values[j]; 
                        if (urlencoded) 
                            item = HttpUtility.UrlEncodeUnicode(item);
                        s.Append(item); 
                    }
                }
            }
 
            return s.ToString();
        } 
 
    }
 
}

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

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