Fix warnings

mdabros · Feb 9, 2025 · f055ab6 · f055ab6
1 parent e8cad73
commit f055ab6
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Showing 2 changed files with 6 additions and 4 deletions.
diff --git a/src/SharpLearning.FeatureTransformations/CsvRowTransforms/DateTimeFeatureTransformer.cs b/src/SharpLearning.FeatureTransformations/CsvRowTransforms/DateTimeFeatureTransformer.cs
@@ -64,7 +64,8 @@ public static string[] FeatureNames
     /// <returns></returns>
     public IEnumerable<CsvRow> Transform(IEnumerable<CsvRow> rows)
     {
-        var newColumnNameToIndex = rows.First().ColumnNameToIndex.ToDictionary(v => v.Key, v => v.Value);
+        var rowsList = rows.ToList();
+        var newColumnNameToIndex = rowsList.First().ColumnNameToIndex.ToDictionary(v => v.Key, v => v.Value);
         var index = newColumnNameToIndex.Count;
 
         foreach (var name in FeatureNames)
@@ -73,7 +74,7 @@ public IEnumerable<CsvRow> Transform(IEnumerable<CsvRow> rows)
             newColumnNameToIndex.Add(newName, index++);
         }
 
-        foreach (var row in rows)
+        foreach (var row in rowsList)
         {
             var dateTime = DateTime.Parse(row.GetValue(m_dateTimeColumn));
 

diff --git a/src/SharpLearning.InputOutput/Csv/CsvWriter.cs b/src/SharpLearning.InputOutput/Csv/CsvWriter.cs
@@ -32,17 +32,18 @@ public CsvWriter(Func<TextWriter> writer, char separator = CsvParser.DefaultDeli
     public void Write(IEnumerable<CsvRow> rows, bool writeHeader = true)
     {
         using var writer = m_writer();
+        var rowsList = rows.ToList();
         if (writeHeader)
         {
-            var headerValues = rows.First().ColumnNameToIndex
+            var headerValues = rowsList.First().ColumnNameToIndex
                                      .OrderBy(kvp => kvp.Value)
                                      .Select(kvp => kvp.Key);
 
             var headerLine = CreateHeader(headerValues);
             writer.Write(headerLine);
         }
 
-        foreach (var row in rows)
+        foreach (var row in rowsList)
         {
             writer.WriteLine();
             WriteColumns(row.Values, writer);