#361 Introduce StringValues to replace string[] usage.

src/Microsoft.AspNet.Http.Abstractions/IHeaderDictionary.cs

@@ -2,21 +2,21 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
 
 namespace Microsoft.AspNet.Http
 {
     /// <summary>
     /// Represents request and response headers
     /// </summary>
-    public interface IHeaderDictionary : IReadableStringCollection, IDictionary<string, string[]>
+    public interface IHeaderDictionary : IReadableStringCollection, IDictionary<string, StringValues>
     {
+        // This property is duplicated to resolve an ambiguity between IReadableStringCollection and IDictionary<string, string[]>
         /// <summary>
-        /// Get or sets the associated value from the collection as a single string.
+        ///
         /// </summary>
-        /// <param name="key">The header name.</param>
-        /// <returns>the associated value from the collection as a single string or null if the key is not present.</returns>
-        new string this[string key] { get; set; }
+        /// <param name="key"></param>
+        /// <returns>The stored value, or StringValues.Empty if the key is not present.</returns>
+        new StringValues this[string key] { get; set; }
 
         // This property is duplicated to resolve an ambiguity between IReadableStringCollection.Count and IDictionary<string, string[]>.Count
         /// <summary>
@@ -36,21 +36,14 @@ public interface IHeaderDictionary : IReadableStringCollection, IDictionary<stri
         /// </summary>
         /// <param name="key">The header name.</param>
         /// <returns>the associated values from the collection separated into individual values, or null if the key is not present.</returns>
-        IList<string> GetCommaSeparatedValues(string key);
+        StringValues GetCommaSeparatedValues(string key);
 
         /// <summary>
-        /// Add a new value. Appends to the header if already present
+        /// Add a new value. Appends to the header list if already present
         /// </summary>
         /// <param name="key">The header name.</param>
         /// <param name="value">The header value.</param>
-        void Append(string key, string value);
-
-        /// <summary>
-        /// Add new values. Each item remains a separate array entry.
-        /// </summary>
-        /// <param name="key">The header name.</param>
-        /// <param name="values">The header values.</param>
-        void AppendValues(string key, params string[] values);
+        void Append(string key, StringValues value);
 
         /// <summary>
         /// Quotes any values containing comas, and then coma joins all of the values with any existing values.
@@ -59,21 +52,6 @@ public interface IHeaderDictionary : IReadableStringCollection, IDictionary<stri
         /// <param name="values">The header values.</param>
         void AppendCommaSeparatedValues(string key, params string[] values);
 
-        /// <summary>
-        /// Sets a specific header value.
-        /// </summary>
-        /// <param name="key">The header name.</param>
-        /// <param name="value">The header value.</param>
-        [SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Set", Justification = "Re-evaluate later.")]
-        void Set(string key, string value);
-
-        /// <summary>
-        /// Sets the specified header values without modification.
-        /// </summary>
-        /// <param name="key">The header name.</param>
-        /// <param name="values">The header values.</param>
-        void SetValues(string key, params string[] values);
-
         /// <summary>
         /// Quotes any values containing comas, and then coma joins all of the values.
         /// </summary>

src/Microsoft.AspNet.Http.Abstractions/IReadableStringCollection.cs

@@ -2,22 +2,21 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
 
 namespace Microsoft.AspNet.Http
 {
     /// <summary>
     /// Accessors for headers, query, forms, etc.
     /// </summary>
-    public interface IReadableStringCollection : IEnumerable<KeyValuePair<string, string[]>>
+    public interface IReadableStringCollection : IEnumerable<KeyValuePair<string, StringValues>>
     {
         /// <summary>
-        /// Get the associated value from the collection.  Multiple values will be merged.
-        /// Returns null if the key is not present.
+        /// Get the associated value from the collection.
+        /// Returns StringValues.Empty if the key is not present.
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
-        string this[string key] { get; }
+        StringValues this[string key] { get; }
 
         /// <summary>
         /// Gets the number of elements contained in the collection.
@@ -35,22 +34,5 @@ public interface IReadableStringCollection : IEnumerable<KeyValuePair<string, st
         /// <param name="key"></param>
         /// <returns></returns>
         bool ContainsKey(string key);
-
-        /// <summary>
-        /// Get the associated value from the collection.  Multiple values will be merged.
-        /// Returns null if the key is not present.
-        /// </summary>
-        /// <param name="key"></param>
-        /// <returns></returns>
-        [SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get", Justification = "Re-evaluate later.")]
-        string Get(string key);
-
-        /// <summary>
-        /// Get the associated values from the collection in their original format.
-        /// Returns null if the key is not present.
-        /// </summary>
-        /// <param name="key"></param>
-        /// <returns></returns>
-        IList<string> GetValues(string key);
     }
 }

src/Microsoft.AspNet.Http.Extensions/HeaderDictionaryTypeExtensions.cs

@@ -50,7 +50,7 @@ internal static void SetList<T>([NotNull] this IHeaderDictionary headers, [NotNu
             }
             else
             {
-                headers.SetValues(name, values.Select(value => value.ToString()).ToArray());
+                headers[name] = values.Select(value => value.ToString()).ToArray();
             }
         }
 
@@ -98,7 +98,7 @@ internal static T Get<T>([NotNull] this IHeaderDictionary headers, string name)
             }
 
             var value = headers[name];
-            if (string.IsNullOrWhiteSpace(value))
+            if (StringValues.IsNullOrEmpty(value))
             {
                 return default(T);
             }
@@ -112,11 +112,11 @@ internal static IList<T> GetList<T>([NotNull] this IHeaderDictionary headers, st
             if (KnownListParsers.TryGetValue(typeof(T), out temp))
             {
                 var func = (Func<IList<string>, IList<T>>)temp;
-                return func(headers.GetValues(name));
+                return func(headers[name]);
             }
 
-            var values = headers.GetValues(name);
-            if (values == null || !values.Any())
+            var values = headers[name];
+            if (StringValues.IsNullOrEmpty(values))
             {
                 return null;
             }
@@ -158,7 +158,7 @@ private static T GetViaReflection<T>(string value)
             return default(T);
         }
 
-        private static IList<T> GetListViaReflection<T>(IList<string> values)
+        private static IList<T> GetListViaReflection<T>(StringValues values)
         {
             // TODO: Cache the reflected type for later? Only if success?
             var type = typeof(T);

src/Microsoft.AspNet.Http.Extensions/RequestHeaders.cs

@@ -285,7 +285,7 @@ public void Append([NotNull] string name, [NotNull] object value)
 
         public void AppendList<T>([NotNull] string name, [NotNull] IList<T> values)
         {
-            Headers.AppendValues(name, values.Select(value => value.ToString()).ToArray());
+            Headers.Append(name, values.Select(value => value.ToString()).ToArray());
         }
     }
 }

src/Microsoft.AspNet.Http.Extensions/ResponseHeaders.cs

@@ -182,7 +182,7 @@ public void Append([NotNull] string name, [NotNull] object value)
 
         public void AppendList<T>([NotNull] string name, [NotNull] IList<T> values)
         {
-            Headers.AppendValues(name, values.Select(value => value.ToString()).ToArray());
+            Headers.Append(name, values.Select(value => value.ToString()).ToArray());
         }
     }
 }

src/Microsoft.AspNet.Http.Features/IHttpRequestFeature.cs

@@ -14,7 +14,7 @@ public interface IHttpRequestFeature
         string PathBase { get; set; }
         string Path { get; set; }
         string QueryString { get; set; }
-        IDictionary<string, string[]> Headers { get; set; }
+        IDictionary<string, StringValues> Headers { get; set; }
         Stream Body { get; set; }
     }
 }

src/Microsoft.AspNet.Http.Features/IHttpResponseFeature.cs

@@ -12,7 +12,7 @@ public interface IHttpResponseFeature
     {
         int StatusCode { get; set; }
         string ReasonPhrase { get; set; }
-        IDictionary<string, string[]> Headers { get; set; }
+        IDictionary<string, StringValues> Headers { get; set; }
         Stream Body { get; set; }
         bool HasStarted { get; }
         void OnStarting(Func<object, Task> callback, object state);