Implemented missing dictionary methods on FastExpando

Dapper/SqlMapper.cs

@@ -1222,7 +1222,7 @@ public override IEnumerable<string> GetDynamicMemberNames()
 
             void IDictionary<string, object>.Add(string key, object value)
             {
-                throw new NotImplementedException();
+                data.Add(key, value);
             }
 
             bool IDictionary<string, object>.ContainsKey(string key)
@@ -1237,7 +1237,7 @@ public override IEnumerable<string> GetDynamicMemberNames()
 
             bool IDictionary<string, object>.Remove(string key)
             {
-                throw new NotImplementedException();
+                return data.Remove(key);
             }
 
             bool IDictionary<string, object>.TryGetValue(string key, out object value)
@@ -1258,10 +1258,6 @@ public override IEnumerable<string> GetDynamicMemberNames()
                 }
                 set
                 {
-                    if (!data.ContainsKey(key)) 
-                    {
-	                    throw new NotImplementedException();
-                    }
                     data[key] = value;
                 }
             }
@@ -1272,12 +1268,12 @@ public override IEnumerable<string> GetDynamicMemberNames()
 
             void ICollection<KeyValuePair<string, object>>.Add(KeyValuePair<string, object> item)
             {
-                throw new NotImplementedException();
+                data.Add(item);
             }
 
             void ICollection<KeyValuePair<string, object>>.Clear()
             {
-                throw new NotImplementedException();
+                data.Clear();
             }
 
             bool ICollection<KeyValuePair<string, object>>.Contains(KeyValuePair<string, object> item)
@@ -1302,7 +1298,7 @@ public override IEnumerable<string> GetDynamicMemberNames()
 
             bool ICollection<KeyValuePair<string, object>>.Remove(KeyValuePair<string, object> item)
             {
-                throw new NotImplementedException();
+                return data.Remove(item);
             }
 
             #endregion
@@ -3060,7 +3056,7 @@ public ConstructorInfo FindConstructor(string[] names, Type[] types)
         /// <returns></returns>
         public SqlMapper.IMemberMap GetConstructorParameter(ConstructorInfo constructor, string columnName)
         {
-            throw new NotImplementedException();
+            throw new NotSupportedException();
         }
 
         /// <summary>

Tests/Tests.cs

@@ -11,6 +11,7 @@
 using System.Reflection;
 using System.Dynamic;
 using System.ComponentModel;
+using Microsoft.CSharp.RuntimeBinder;
 #if POSTGRESQL
 using Npgsql;
 #endif
@@ -2120,6 +2121,23 @@ public void TestMultiSelectWithSomeEmptyGrids()
                 four[0].IsEqualTo(4);
             }
         }
+        [ActiveTest]
+        public void TestDynamicMutation()
+        {
+            var obj = connection.Query("select 1 as [a], 2 as [b], 3 as [c]").Single();
+            ((int)obj.a).IsEqualTo(1);
+            IDictionary<string,object> dict = obj;
+            dict.Remove("a");
+            try
+            {
+                ((int)obj.a).IsEqualTo(1);
+                throw new InvalidOperationException("should have thrown");
+            }
+            catch (RuntimeBinderException)
+            {
+                // pass
+            }
+        }
 
         class TransactedConnection : IDbConnection
         {