Supplement Insert methods for pair list.

Assets/Cryville/Common/Collections/Generic/IPairList.cs

@@ -4,8 +4,10 @@ using System.Collections.Generic;
 namespace Cryville.Common.Collections.Generic {
 	public interface IPairList : IList {
 		void Add(object key, object value);
+		void Insert(int index, object key, object value);
 	}
 	public interface IPairList<TKey, TValue> : IList<KeyValuePair<TKey, TValue>>, IPairList {
 		void Add(TKey key, TValue value);
+		void Insert(int index, TKey key, TValue value);
 	}
 }

Assets/Cryville/Common/Collections/Generic/PairList.cs

@@ -6,6 +6,10 @@ namespace Cryville.Common.Collections.Generic {
 		public void Add(object key, object value) {
 			Add(new KeyValuePair<object, object>(key, value));
 		}
+
+		public void Insert(int index, object key, object value) {
+			Insert(index, new KeyValuePair<object, object>(key, value));
+		}
 	}
 	public class PairList<TKey, TValue> : List<KeyValuePair<TKey, TValue>>, IPairList<TKey, TValue> {
 		public void Add(TKey key, TValue value) {
@@ -20,5 +24,18 @@ namespace Cryville.Common.Collections.Generic {
 				throw new ArgumentException("Wrong key type or value type");
 			}
 		}
+
+		public void Insert(int index, TKey key, TValue value) {
+			Insert(index, new KeyValuePair<TKey, TValue>(key, value));
+		}
+
+		public void Insert(int index, object key, object value) {
+			try {
+				Insert(index, (TKey)key, (TValue)value);
+			}
+			catch (InvalidCastException) {
+				throw new ArgumentException("Wrong key type or value type");
+			}
+		}
 	}
 }