Fixed #3207. Added an exception to the parameterless constructor for KeyType because it doesn't make sense to use it without a parameter (#3852)

harishsk · codemzs · commit a1ede65b04fe · 2019-07-01T05:31:34.000-07:00
diff --git a/src/Microsoft.ML.Data/Data/SchemaDefinition.cs b/src/Microsoft.ML.Data/Data/SchemaDefinition.cs
@@ -28,7 +28,7 @@ public sealed class KeyTypeAttribute : Attribute
         /// </remarks>
         public KeyTypeAttribute()
         {
-
+            throw Contracts.ExceptNotSupp("Using KeyType without the Count parameter is not supported");
         }
 
         /// <summary>

Original file line number	Diff line number	Diff line change
`@@ -28,7 +28,7 @@ public sealed class KeyTypeAttribute : Attribute`
`28`	`28`	`/// </remarks>`
`29`	`29`	`public KeyTypeAttribute()`
`30`	`30`	`{`
`31`		`-`
	`31`	`+ throw Contracts.ExceptNotSupp("Using KeyType without the Count parameter is not supported");`
`32`	`32`	`}`
`33`	`33`
`34`	`34`	`/// <summary>`