Use global:: prefix

src/ProxyInterfaceSourceGenerator/FileGenerators/ProxyClassesGenerator.cs

@@ -134,7 +134,7 @@ private string GeneratePublicProperties(ClassSymbol targetClassSymbol, ProxyData
 
             var instance = !property.IsStatic ?
                 "_Instance" :
-                $"{targetClassSymbol.Symbol}";
+                $"{targetClassSymbol.Symbol.ToFullyQualifiedDisplayString()}";
 
             var propertyName = property.GetSanitizedName();
             var instancePropertyName = $"{instance}.{propertyName}";

tests/ProxyInterfaceSourceGeneratorTests/Destination/ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider.g.cs

@@ -0,0 +1,38 @@
+//----------------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by https://github.com/StefH/ProxyInterfaceSourceGenerator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//----------------------------------------------------------------------------------------
+
+#nullable enable
+using System;
+
+namespace ProxyInterfaceSourceGeneratorTests.Source
+{
+    public partial interface ITimeProvider
+    {
+        global::System.TimeProvider _Instance { get; }
+
+        global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider System { get; }
+
+        global::System.TimeZoneInfo LocalTimeZone { get; }
+
+        long TimestampFrequency { get; }
+
+        global::System.DateTimeOffset GetUtcNow();
+
+        global::System.DateTimeOffset GetLocalNow();
+
+        long GetTimestamp();
+
+        global::System.TimeSpan GetElapsedTime(long startingTimestamp, long endingTimestamp);
+
+        global::System.TimeSpan GetElapsedTime(long startingTimestamp);
+
+        global::System.Threading.ITimer CreateTimer(global::System.Threading.TimerCallback callback, object? state, global::System.TimeSpan dueTime, global::System.TimeSpan period);
+    }
+}
+#nullable restore

tests/ProxyInterfaceSourceGeneratorTests/Destination/ProxyInterfaceSourceGeneratorTests.Source.PersonExtendsProxy.g.cs

@@ -18,7 +18,7 @@ public partial class PersonExtendsProxy : global::ProxyInterfaceSourceGeneratorT
 
         public global::ProxyInterfaceSourceGeneratorTests.Source.PersonExtends _Instance { get; }
 
-        public string StaticString { get => ProxyInterfaceSourceGeneratorTests.Source.PersonExtends.StaticString; set => ProxyInterfaceSourceGeneratorTests.Source.PersonExtends.StaticString = value; }
+        public string StaticString { get => global::ProxyInterfaceSourceGeneratorTests.Source.PersonExtends.StaticString; set => global::ProxyInterfaceSourceGeneratorTests.Source.PersonExtends.StaticString = value; }
 
         public string Name { get => _Instance.Name; set => _Instance.Name = value; }
 

tests/ProxyInterfaceSourceGeneratorTests/Destination/System.Net.Http.HttpClientProxy.g.cs

@@ -18,7 +18,7 @@ public partial class HttpClientProxy : global::ProxyInterfaceSourceGeneratorTest
 
         public new global::System.Net.Http.HttpClient _Instance { get; }
         public global::System.Net.Http.HttpMessageInvoker _InstanceHttpMessageInvoker { get; }
-        public global::System.Net.IWebProxy DefaultProxy { get => System.Net.Http.HttpClient.DefaultProxy; set => System.Net.Http.HttpClient.DefaultProxy = value; }
+        public global::System.Net.IWebProxy DefaultProxy { get => global::System.Net.Http.HttpClient.DefaultProxy; set => global::System.Net.Http.HttpClient.DefaultProxy = value; }
 
         public global::System.Net.Http.Headers.HttpRequestHeaders DefaultRequestHeaders { get => _Instance.DefaultRequestHeaders; }
 

tests/ProxyInterfaceSourceGeneratorTests/Destination/System.TimeProviderProxy.g.cs

@@ -0,0 +1,84 @@
+//----------------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by https://github.com/StefH/ProxyInterfaceSourceGenerator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//----------------------------------------------------------------------------------------
+
+#nullable enable
+using System;
+
+namespace ProxyInterfaceSourceGeneratorTests.Source
+{
+    public partial class TimeProviderProxy : global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider
+    {
+        static TimeProviderProxy()
+        {
+            Mapster.TypeAdapterConfig<global::System.TimeProvider, global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider>.NewConfig().ConstructUsing(instance98737229 => new global::ProxyInterfaceSourceGeneratorTests.Source.TimeProviderProxy(instance98737229));
+            Mapster.TypeAdapterConfig<global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider, global::System.TimeProvider>.NewConfig().MapWith(proxy_979750559 => ((global::ProxyInterfaceSourceGeneratorTests.Source.TimeProviderProxy) proxy_979750559)._Instance);
+
+        }
+
+
+        public global::System.TimeProvider _Instance { get; }
+
+        public global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider System { get => Mapster.TypeAdapter.Adapt<global::ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider>(global::System.TimeProvider.System); }
+
+        public virtual global::System.TimeZoneInfo LocalTimeZone { get => _Instance.LocalTimeZone; }
+
+        public virtual long TimestampFrequency { get => _Instance.TimestampFrequency; }
+
+        public virtual global::System.DateTimeOffset GetUtcNow()
+        {
+            var result__1870298920 = _Instance.GetUtcNow();
+            return result__1870298920;
+        }
+
+        public global::System.DateTimeOffset GetLocalNow()
+        {
+            var result__1410738147 = _Instance.GetLocalNow();
+            return result__1410738147;
+        }
+
+        public virtual long GetTimestamp()
+        {
+            var result__1193196790 = _Instance.GetTimestamp();
+            return result__1193196790;
+        }
+
+        public global::System.TimeSpan GetElapsedTime(long startingTimestamp, long endingTimestamp)
+        {
+            long startingTimestamp_ = startingTimestamp;
+            long endingTimestamp_ = endingTimestamp;
+            var result__865310895 = _Instance.GetElapsedTime(startingTimestamp_, endingTimestamp_);
+            return result__865310895;
+        }
+
+        public global::System.TimeSpan GetElapsedTime(long startingTimestamp)
+        {
+            long startingTimestamp_ = startingTimestamp;
+            var result__865310895 = _Instance.GetElapsedTime(startingTimestamp_);
+            return result__865310895;
+        }
+
+        public virtual global::System.Threading.ITimer CreateTimer(global::System.Threading.TimerCallback callback, object? state, global::System.TimeSpan dueTime, global::System.TimeSpan period)
+        {
+            global::System.Threading.TimerCallback callback_ = callback;
+            object? state_ = state;
+            global::System.TimeSpan dueTime_ = dueTime;
+            global::System.TimeSpan period_ = period;
+            var result_1335635543 = _Instance.CreateTimer(callback_, state_, dueTime_, period_);
+            return result_1335635543;
+        }
+
+
+        public TimeProviderProxy(global::System.TimeProvider instance)
+        {
+            _Instance = instance;
+
+        }
+    }
+}
+#nullable restore

tests/ProxyInterfaceSourceGeneratorTests/ProxyInterfaceSourceGeneratorTest.cs

@@ -786,4 +786,49 @@ public Task GenerateFiles_ForClassWithIgnores_Regex()
         var results = result.GeneratorDriver.GetRunResult().Results.First().GeneratedSources;
         return Verify(results);
     }
+
+    [Fact]
+    public void GenerateFiles_ForTimeProvider_Should_GenerateCorrectFiles()
+    {
+        // Arrange
+        var fileNames = new[]
+        {
+            "ProxyInterfaceSourceGeneratorTests.Source.ITimeProvider.g.cs",
+            "System.TimeProviderProxy.g.cs"
+        };
+
+        var path = Path.Combine(_basePath, "Source/ITimeProvider.cs");
+        var sourceFile = new SourceFile
+        {
+            Path = path,
+            Text = File.ReadAllText(path),
+            AttributeToAddToInterface = new ExtraAttribute
+            {
+                Name = "ProxyInterfaceGenerator.Proxy",
+                ArgumentList = "typeof(System.TimeProvider)"
+            }
+        };
+
+        // Act
+        var result = _sut.Execute([sourceFile]);
+
+        // Assert
+        Assert(result, fileNames);
+    }
+
+    private void Assert(ExecuteResult result, string[] fileNames)
+    {
+        result.Valid.Should().BeTrue();
+        result.Files.Should().HaveCount(fileNames.Length + 1);
+
+        foreach (var fileName in fileNames.Select((fileName, index) => new { fileName, index }))
+        {
+            var builder = result.Files[fileName.index + 1]; // +1 means skip the attribute
+            builder.Path.Should().EndWith(fileName.fileName);
+
+            var destinationFilename = Path.Combine(_basePath, $"Destination/{fileName.fileName}");
+            if (Write) File.WriteAllText(destinationFilename, builder.Text);
+            builder.Text.Should().Be(File.ReadAllText(destinationFilename));
+        }
+    }
 }

tests/ProxyInterfaceSourceGeneratorTests/Source/ITimeProvider.cs

@@ -0,0 +1,6 @@
+namespace ProxyInterfaceSourceGeneratorTests.Source
+{
+    public partial interface ITimeProvider
+    {
+    }
+}