1 files changed, 34 insertions, 0 deletions
diff --git a/src/Editor/Core/Def/ContentType/FileExtensionAttribute.cs b/src/Editor/Core/Def/ContentType/FileExtensionAttribute.cs
new file mode 100644
index 0000000..6df6ad3
--- /dev/null
+++ b/src/Editor/Core/Def/ContentType/FileExtensionAttribute.cs
@@ -0,0 +1,34 @@
+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+using System;
+
+namespace Microsoft.VisualStudio.Utilities
+{
+    /// <summary>
+    /// Identifies a file extension.
+    /// </summary>
+    public sealed class FileExtensionAttribute : SingletonBaseMetadataAttribute
+    {
+
+        /// <summary>
+        /// Constructs a new instance of the attribute.
+        /// </summary>
+        /// <param fileExtension="fileExtension">The file extension.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="fileExtension"/> is null or empty.</exception>
+        public FileExtensionAttribute(string fileExtension)
+        {
+            if (string.IsNullOrWhiteSpace(fileExtension))
+            {
+                throw new ArgumentNullException(nameof(fileExtension));
+            }
+            this.FileExtension = fileExtension;
+        }
+
+        /// <summary>
+        /// Gets the file extension.
+        /// </summary>
+        public string FileExtension { get; }
+    }
+}