make virtual file system return the root directory

framework/src/Volo.Abp.VirtualFileSystem/Volo/Abp/VirtualFileSystem/DictionaryBasedFileProvider.cs

@@ -11,7 +11,7 @@ namespace Volo.Abp.VirtualFileSystem
 
         public virtual IFileInfo GetFileInfo(string subpath)
         {
-            if (string.IsNullOrEmpty(subpath))
+            if (subpath == null)
             {
                 return new NotFoundFileInfo(subpath);
             }
@@ -67,4 +67,4 @@ namespace Volo.Abp.VirtualFileSystem
             return subpath;
         }
     }
-}
+}

framework/src/Volo.Abp.VirtualFileSystem/Volo/Abp/VirtualFileSystem/VirtualFilePathHelper.cs

@@ -10,6 +10,11 @@ namespace Volo.Abp.VirtualFileSystem
 
         public static string NormalizePath(string fullPath)
         {
+            if (fullPath == "/")
+            {
+                return string.Empty;
+            }
+
             var fileName = fullPath;
             var extension = "";
 
@@ -29,7 +34,7 @@ namespace Volo.Abp.VirtualFileSystem
 
             return NormalizeChars(fileName) + extension;
         }
-        
+
         private static string NormalizeChars(string fileName)
         {
             var folderParts = fileName.Replace(".", "/").Split("/");
@@ -42,4 +47,4 @@ namespace Volo.Abp.VirtualFileSystem
             return folderParts.Take(folderParts.Length - 1).Select(s => s.Replace("-", "_")).JoinAsString("/") + "/" + folderParts.Last();
         }
     }
-}
+}

framework/test/Volo.Abp.VirtualFileSystem.Tests/Volo/Abp/VirtualFileSystem/VirtualFileProvider_Tests.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Linq;
 using System.Text;
 using Microsoft.Extensions.DependencyInjection;
@@ -47,6 +48,21 @@ namespace Volo.Abp.VirtualFileSystem
             contentList.ShouldContain(x => x.Name == "jquery-3-1-1-min.js");
         }
 
+        [Theory]
+        [InlineData("/")]
+        [InlineData("")]
+        public void Should_Define_And_Get_Embedded_Root_Directory_Contents(string path)
+        {
+            //Act
+            var contents = _virtualFileProvider.GetDirectoryContents(path);
+
+            //Assert
+            contents.Exists.ShouldNotBeNull();
+
+            var contentList = contents.ToList();
+            contentList.ShouldContain(x => x.Name == "js");
+        }
+
         [DependsOn(typeof(AbpVirtualFileSystemModule))]
         public class TestModule : AbpModule
         {