diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e142989..d641a01f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -89,6 +89,11 @@ Status of the `main` branch. Changes prior to the next official version change w
     thread (#2038)
 
 * Language Servers:
+  - Fix: The C# language server opened every `.csproj` found anywhere under the repository root,
+    without consulting the project's ignore settings. On repositories that vendor third-party or
+    sample C# projects, this loads projects the server cannot restore on every start, and their
+    restore failures bury the diagnostics of the projects the user actually works on. Project
+    discovery now skips `.csproj` files matched by the project's ignore patterns
   - Kotlin: update the managed Kotlin LSP from `262.9593.0` to `263.4702.0`; the `262.9593.0` build
     has expired and fails on startup with "This build of intellij-server has expired" (#2008)
   - Fix: Godot's GDScript parser can report a symbol's end column one column past the
diff --git a/src/solidlsp/language_servers/csharp_language_server.py b/src/solidlsp/language_servers/csharp_language_server.py
index ce34f2e6..a411cc78 100644
--- a/src/solidlsp/language_servers/csharp_language_server.py
+++ b/src/solidlsp/language_servers/csharp_language_server.py
@@ -748,11 +748,24 @@ class CSharpLanguageServer(SolidLanguageServer):
             self.server.notify.send_notification("solution/open", {"solution": solution_uri})
             log.debug(f"Opened solution file: {solution_file}")
 
-        # Find and open project files
+        # Find and open project files, skipping any that the project's ignore settings exclude.
+        # Vendored, third-party and sample trees routinely contain .csproj files that the language
+        # server cannot restore or build. Each one costs a project load on every server start, and
+        # the resulting restore failures bury the diagnostics of the projects the user cares about.
         project_files = []
+        skipped = 0
         for filename in breadth_first_file_scan(self.repository_root_path):
-            if filename.endswith(".csproj"):
-                project_files.append(filename)
+            if not filename.endswith(".csproj"):
+                continue
+            relative_path = os.path.relpath(filename, self.repository_root_path)
+            # ignore_unsupported_files=False, because a .csproj is not itself a C# source file and
+            # would otherwise be excluded on file type rather than by the ignore patterns.
+            if self.is_ignored_path(relative_path, ignore_unsupported_files=False):
+                skipped += 1
+                continue
+            project_files.append(filename)
+        if skipped:
+            log.debug(f"Skipped {skipped} .csproj file(s) matched by the project's ignore settings")
 
         # Send project/open notifications for each project file
         if project_files: