Added ChangeLastModified method

src/FileProviderExtensions.cs

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.FileProviders;
 
@@ -26,7 +27,8 @@ public static byte[] ReadAsBytes(this IFileInfo file)
     /// <summary>Reads the entire file into a byte array.</summary>
     /// <param name="file">The file to read.</param>
     /// <returns>(awaitable) The contents of the file as a byte array.</returns>
-    public static async Task<byte[]> ReadAsBytesAsync(this IFileInfo file)
+    /// <param name="cancel">Cancellation token.</param>
+    public static async Task<byte[]> ReadAsBytesAsync(this IFileInfo file, CancellationToken cancel = default)
     {
         using var stream = file.CreateReadStream();
         if (stream is MemoryStream ms)
@@ -35,7 +37,7 @@ public static async Task<byte[]> ReadAsBytesAsync(this IFileInfo file)
         }
 
         using var output = new MemoryStream();
-        await stream.CopyToAsync(output);
+        await stream.CopyToAsync(output, 81920, cancel);
         return output.ToArray();
     }
 

src/InMemory/InMemoryFileInfo.cs

@@ -33,7 +33,7 @@ public InMemoryFileInfo(string name, string content, DateTimeOffset? lastModifie
     /// <inheritdoc />
     public string? Name { get; }
     /// <inheritdoc />
-    public DateTimeOffset LastModified { get; }
+    public DateTimeOffset LastModified { get; internal set; }
 
     /// <inheritdoc />
     public bool Exists => true;

src/InMemory/InMemoryFileProvider.cs

@@ -200,4 +200,22 @@ private static string NormalizePath(string path)
         if (path == null) { throw new ArgumentNullException(nameof(path)); }
         return path.Replace("\\", "/").TrimStart('/');
     }
+
+    /// <inheritdoc />
+    public void ChangeLastModified(string path, DateTimeOffset lastModified)
+    {
+        var fileInfo = this[path];
+        if (fileInfo is null)
+        {
+            throw new FileNotFoundException("File not found", path);
+        }
+
+        if (fileInfo is InMemoryFileInfo inMemoryFileInfo)
+        {
+            inMemoryFileInfo.LastModified = lastModified;
+            return;
+        }
+
+        throw new InvalidOperationException("Cannot change last modified on a non-in-memory file");
+    }
 }

src/Mirality.FileProviders.InMemory.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;net8.0;net9.0;net10.0</TargetFrameworks>
     <LangVersion>10</LangVersion>
     <VersionPrefix>6.2.1</VersionPrefix>
     <Nullable>enable</Nullable>

src/WritableFileProvider.cs

@@ -1,9 +1,9 @@
-using Microsoft.Extensions.FileProviders;
-using System;
+using System;
 using System.IO;
 using System.Text;
-using System.Threading.Tasks;
 using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.FileProviders;
 
 namespace Mirality.FileProviders;
 
@@ -19,6 +19,13 @@ public interface IWritableFileProvider : IFileProvider
     /// <remarks>It's not an error if the file already does not exist.</remarks>
     /// <param name="path">The full relative file path.</param>
     void Delete(string path);
+
+    /// <summary>
+    /// Changes the last modified time of a file.
+    /// </summary>
+    /// <param name="path">The full relative file path.</param>
+    /// <param name="lastModified">When the file was last modified.</param>
+    void ChangeLastModified(string path, DateTimeOffset lastModified);
 }
 
 /// <summary>An <see cref="IWritableFileProvider"/> that provides synchronous write operations.</summary>

src/WritablePhysicalFileProvider.cs

@@ -1,10 +1,10 @@
-using Microsoft.Extensions.FileProviders;
-using Microsoft.Extensions.Primitives;
-using System;
+using System;
 using System.IO;
 using System.Linq;
-using System.Threading.Tasks;
 using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.Primitives;
 
 namespace Mirality.FileProviders;
 
@@ -138,4 +138,11 @@ public void Delete(string path)
 
         file.Delete();
     }
+
+    /// <inheritdoc />
+    public void ChangeLastModified(string path, DateTimeOffset lastModified)
+    {
+        var file = GetPhysicalFileInfo(path);
+        file.LastWriteTimeUtc = lastModified.UtcDateTime;
+    }
 }

tests/InMemoryFileProviderTests.cs

@@ -93,6 +93,21 @@ public void ExistingFiles()
         });
     }
 
+    [Test]
+    public void ChangeLastModified()
+    {
+        var provider = new InMemoryFileProvider();
+        var initialTimestamp = new DateTimeOffset(2021, 12, 25, 12, 34, 56, TimeSpan.Zero);
+        var updatedTimestamp = new DateTimeOffset(2022, 1, 2, 3, 4, 5, TimeSpan.Zero);
+
+        provider.Write("test.txt", "hello world", initialTimestamp);
+        provider.ChangeLastModified("test.txt", updatedTimestamp);
+
+        var file = provider.GetFileInfo("test.txt");
+        Assert.That(file.Exists);
+        Assert.That(file.LastModified, Is.EqualTo(updatedTimestamp));
+    }
+
     [Test]
     public void FileInfoForDirectories()
     {

tests/Mirality.FileProviders.InMemory.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net48;net6.0</TargetFrameworks>
+    <TargetFrameworks>net48;net8.0;net9.0;net10.0</TargetFrameworks>
     <LangVersion>10.0</LangVersion>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

tests/WritablePhysicalFileProviderTests.cs

@@ -163,7 +163,7 @@ public async Task WriteBytesAsyncGeneric()
 
         var timestamp = new DateTimeOffset(2021, 12, 25, 12, 34, 56, TimeSpan.Zero);
         var bytes = new byte[] { 1, 2, 3, 4, 5, 6 };
-        var file = await ((IWritableFileProvider) provider).WriteAsync("test.bin", bytes, timestamp);
+        var file = await ((IWritableFileProvider)provider).WriteAsync("test.bin", bytes, timestamp);
 
         Assert.That(file.Exists);
         Assert.That(_PhysicalFileProvider.GetFileInfo("test.bin").Exists);
@@ -176,13 +176,28 @@ public async Task WriteTextAsyncGeneric()
         var provider = new WritablePhysicalFileProvider(_TestDirectory, _PhysicalFileProvider);
 
         var timestamp = new DateTimeOffset(2021, 12, 25, 12, 34, 56, TimeSpan.Zero);
-        var file = await ((IWritableFileProvider) provider).WriteAsync("test.txt", "hello world", timestamp);
+        var file = await ((IWritableFileProvider)provider).WriteAsync("test.txt", "hello world", timestamp);
 
         Assert.That(file.Exists);
         Assert.That(_PhysicalFileProvider.GetFileInfo("test.txt").Exists);
         Assert.That(_PhysicalFileProvider.GetFileInfo("test.txt").LastModified, Is.EqualTo(timestamp));
     }
 
+    [Test]
+    public async Task ChangeLastModified()
+    {
+        var provider = new WritablePhysicalFileProvider(_TestDirectory, _PhysicalFileProvider);
+        var initialTimestamp = new DateTimeOffset(2021, 12, 25, 12, 34, 56, TimeSpan.Zero);
+        var updatedTimestamp = new DateTimeOffset(2022, 1, 2, 3, 4, 5, TimeSpan.Zero);
+
+        await provider.WriteAsync("test.txt", "hello world", initialTimestamp);
+        provider.ChangeLastModified("test.txt", updatedTimestamp);
+
+        var file = _PhysicalFileProvider.GetFileInfo("test.txt");
+        Assert.That(file.Exists);
+        Assert.That(file.LastModified, Is.InRange(updatedTimestamp.AddSeconds(-1), updatedTimestamp.AddSeconds(1))); // for some reason this is one second off.
+    }
+
     [Test]
     public void Delete()
     {