Properly detect availability of BinaryFormatter (pythonnet#2639)

filmor · web-flow · commit 0258688e684c · 2025-10-21T19:20:12.000+02:00
diff --git a/src/runtime/StateSerialization/RuntimeData.cs b/src/runtime/StateSerialization/RuntimeData.cs
@@ -20,7 +20,9 @@ public static class RuntimeData
         {
             try
             {
-                return new BinaryFormatter();
+                var res = new BinaryFormatter();
+                res.Serialize(new MemoryStream(), 1); // test if BinaryFormatter is usable
+                return res;
             }
             catch
             {

Original file line number	Diff line number	Diff line change
`@@ -20,7 +20,9 @@ public static class RuntimeData`
`20`	`20`	`{`
`21`	`21`	`try`
`22`	`22`	`{`
`23`		`- return new BinaryFormatter();`
	`23`	`+ var res = new BinaryFormatter();`
	`24`	`+ res.Serialize(new MemoryStream(), 1); // test if BinaryFormatter is usable`
	`25`	`+ return res;`
`24`	`26`	`}`
`25`	`27`	`catch`
`26`	`28`	`{`