ColumnNameAttribute not working for TextLoader

[feiyun0112]

Issue

ML.NET Tutorial define IrisData class like this:

       public class IrisData
        {
            [Column("0")]
            public float SepalLength;

            [Column("1")]
            public float SepalWidth;

            [Column("2")]
            public float PetalLength;

            [Column("3")]
            public float PetalWidth;

            [Column("4")]
            [ColumnName("Label")]
            public string Label;
        }

If I changed field name from Label to other name(like Label_1)

        public class IrisData
        {
            [Column("0")]
            public float SepalLength;

            [Column("1")]
            public float SepalWidth;

            [Column("2")]
            public float PetalLength;

            [Column("3")]
            public float PetalWidth;

            [Column("4")]
            [ColumnName("Label")]
            public string Label_1;
        }

It will throw Exception(Source column 'Label' not found):

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in System.Private.CoreLib.dll: 'Exception has been thrown by the target of an invocation.'
 Inner exceptions found, see $exception in variables window for more details.
 Innermost exception 	 System.ArgumentOutOfRangeException : Source column 'Label' not found
   at Microsoft.ML.Runtime.Data.OneToOneTransformBase.Bindings.Create(OneToOneTransformBase parent, OneToOneColumn[] column, ISchema input, ITransposeSchema transInput, Func`2 testType)
   at Microsoft.ML.Runtime.Data.OneToOneTransformBase..ctor(IHostEnvironment env, String name, OneToOneColumn[] column, IDataView input, Func`2 testType)
   at Microsoft.ML.Runtime.Data.TermTransform..ctor(ArgumentsBase args, ColumnBase[] column, IHostEnvironment env, IDataView input)
   at Microsoft.ML.Runtime.Transforms.TextAnalytics.TermTransform(IHostEnvironment env, Arguments input)

Fix

It can be fixed by setting name in ColumnAttribute

[Column("4","Label")]            
public string Label_1;