Add implicit operators to WireMockList (#823)

* Add implicit operators to WireMockList

* .

src/WireMock.Net.Abstractions/Types/WireMockList.cs

@@ -1,8 +1,7 @@
-using System.Collections.Generic;
-using System.Linq;
+using System.Collections.Generic;
+
+namespace WireMock.Types;
 
-namespace WireMock.Types
-{
 /// <summary>
 /// A special List which overrides the ToString() to return first value.
 /// </summary>
@@ -33,12 +32,38 @@ namespace WireMock.Types
     {
     }
 
+    /// <summary>
+    /// Operator for setting T
+    /// </summary>
+    /// <param name="value">The value to set.</param>
+    public static implicit operator WireMockList<T>(T value) => new(value);
+
+    /// <summary>
+    /// Operator for setting T[]
+    /// </summary>
+    /// <param name="values">The values to set.</param>
+    public static implicit operator WireMockList<T>(T[] values) => new(values);
+
     /// <summary>
     /// Returns a <see cref="string" /> that represents this instance.
     /// </summary>
     public override string ToString()
     {
-            return this.Any() ? this.First().ToString() : base.ToString();
+        switch (Count)
+        {
+            case 0:
+                return string.Empty;
+
+            case 1:
+                if (this[0] is string strValue)
+                {
+                    return strValue;
+                }
+
+                return this[0]?.ToString();
+
+            default:
+                return base.ToString();
         }
     }
 }

src/WireMock.Net/ResponseMessage.cs

@@ -39,7 +39,7 @@ public class ResponseMessage : IResponseMessage
     public void AddHeader(string name, string value)
     {
         Headers ??= new Dictionary<string, WireMockList<string>>();
-        Headers.Add(name, new WireMockList<string>(value));
+        Headers.Add(name, value);
     }
 
     /// <inheritdoc cref="IResponseMessage.AddHeader(string, string[])" />
@@ -52,6 +52,6 @@ public class ResponseMessage : IResponseMessage
             ? values.Union(existingValues).ToArray()
             : values;
 
-        Headers[name] = new WireMockList<string>(newHeaderValues);
+        Headers[name] = newHeaderValues;
     }
 }

src/WireMock.Net/Serialization/MappingConverter.cs

@@ -251,8 +251,15 @@ internal class MappingConverter
         var newDictionary = new Dictionary<string, object>();
         foreach (var entry in dictionary)
         {
-            object value = entry.Value.Count == 1 ? entry.Value.ToString() : entry.Value;
-            newDictionary.Add(entry.Key, value);
+            // ReSharper disable once ConvertIfStatementToConditionalTernaryExpression
+            if (entry.Value.Count == 1)
+            {
+                newDictionary.Add(entry.Key, entry.Value.ToString());
+            }
+            else
+            {
+                newDictionary.Add(entry.Key, entry.Value);
+            }
         }
 
         return newDictionary;