Initial commit

vs4win/Chapter09/WorkingWithRandomAccess/Program.cs

@@ -0,0 +1,20 @@
+using Microsoft.Win32.SafeHandles; // SafeFileHandle
+using System.Text; // Encoding
+
+using SafeFileHandle handle =
+  File.OpenHandle(path: "coffee.txt", 
+    mode: FileMode.OpenOrCreate,
+    access: FileAccess.ReadWrite);
+
+// write to the file
+string message = "Café £4.39";
+ReadOnlyMemory<byte> buffer = new(Encoding.UTF8.GetBytes(message));
+await RandomAccess.WriteAsync(handle, buffer, fileOffset: 0);
+
+// read from the file
+long length = RandomAccess.GetLength(handle);
+Memory<byte> contentBytes = new(new byte[length]);
+await RandomAccess.ReadAsync(handle, contentBytes, fileOffset: 0);
+string content = Encoding.UTF8.GetString(contentBytes.ToArray());
+WriteLine($"Content of file: {content}");
+

vs4win/Chapter09/WorkingWithRandomAccess/WorkingWithRandomAccess.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<Using Include="System.Console" Static="true" />
+	</ItemGroup>
+
+</Project>