change to properties, artifact names

build_projects/dotnet-cli-build/DownloadFile.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.Compression;
+using System.Runtime.InteropServices;
+using System.Net.Http;
+using Microsoft.Build.Utilities;
+using Microsoft.DotNet.Cli.Build.Framework;
+using Microsoft.DotNet.InternalAbstractions;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+
+using static Microsoft.DotNet.Cli.Build.Framework.BuildHelpers;
+
+namespace Microsoft.DotNet.Cli.Build
+{
+    public class DownloadFile : Task
+    {
+        [Required]
+        public string Uri { get; set; }
+
+        [Required]
+        public string DestinationPath { get; set; }
+
+        public bool Overwrite { get; set; }
+
+        public override bool Execute()
+        {
+            FS.Mkdirp(Path.GetDirectoryName(DestinationPath));
+
+            if (File.Exists(DestinationPath) && !Overwrite)
+            {
+                return true;
+            }
+
+            using (var httpClient = new HttpClient())
+            {
+                var getTask = httpClient.GetStreamAsync(Uri);
+
+                using (var outStream = File.Create(DestinationPath))
+                {
+                    getTask.Result.CopyTo(outStream);
+                }
+            }
+
+            return true;
+        }
+    }
+}