Update DataFrame.cs

Author: michaelgsharp

src/Microsoft.Data.Analysis/DataFrame.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -504,7 +504,7 @@ public DataFrame Append(IEnumerable<DataFrameRow> rows, bool inPlace = false, Cu
         /// <remarks>If <paramref name="row"/> is null, a null value is appended to each column</remarks>
         /// <param name="row"></param> 
         /// <param name="inPlace">If set, appends a <paramref name="row"/> in place. Otherwise, a new DataFrame is returned with an appended <paramref name="row"/> </param>
-        /// <param name="cultureInfo">culture info for formatting values</param>
+        /// <param name="cultureInfo">Culture info for formatting values</param>
         public DataFrame Append(IEnumerable<object> row = null, bool inPlace = false, CultureInfo cultureInfo = null)
         {
             if (cultureInfo == null)
@@ -587,8 +587,14 @@ public DataFrame Append(IEnumerable<object> row = null, bool inPlace = false, Cu
         /// <remarks>If a column's value doesn't match its column's data type, a conversion will be attempted</remarks> 
         /// <param name="row">An enumeration of column name and value to be appended</param> 
         /// <param name="inPlace">If set, appends <paramref name="row"/> in place. Otherwise, a new DataFrame is returned with an appended <paramref name="row"/> </param>
-        public DataFrame Append(IEnumerable<KeyValuePair<string, object>> row, bool inPlace = false)
+        /// <param name="cultureInfo">Culture info for formatting values</param>
+        public DataFrame Append(IEnumerable<KeyValuePair<string, object>> row, bool inPlace = false, CultureInfo cultureInfo = null)
         {
+            if (cultureInfo == null)
+            {
+                cultureInfo = CultureInfo.CurrentCulture;
+            }
+
             DataFrame ret = inPlace ? this : Clone();
             if (row == null)
             {
@@ -609,7 +615,7 @@ public DataFrame Append(IEnumerable<KeyValuePair<string, object>> row, bool inPl
                 object value = columnAndValue.Value;
                 if (value != null)
                 {
-                    value = Convert.ChangeType(value, column.DataType);
+                    value = Convert.ChangeType(value, column.DataType, cultureInfo);
                     if (value is null)
                     {
                         throw new ArgumentException(string.Format(Strings.MismatchedValueType, column.DataType), column.Name);