[Mono-bugs] [Bug 58121][Nor] New - Exception in generic c# program
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bugzilla-daemon@bugzilla.ximian.com
Thu, 6 May 2004 06:42:23 -0400 (EDT)
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Changed by mwh@sysrq.dk.
http://bugzilla.ximian.com/show_bug.cgi?id=58121
--- shadow/58121 2004-05-06 06:42:23.000000000 -0400
+++ shadow/58121.tmp.7904 2004-05-06 06:42:23.000000000 -0400
@@ -0,0 +1,75 @@
+Bug#: 58121
+Product: Mono: Compilers
+Version: unspecified
+OS:
+OS Details: LFS
+Status: NEW
+Resolution:
+Severity:
+Priority: Normal
+Component: C#
+AssignedTo: mono-bugs@ximian.com
+ReportedBy: mwh@sysrq.dk
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL:
+Cc:
+Summary: Exception in generic c# program
+
+I use Mono Beta 1
+
+When I compile with gmcs and run the following program
+I get an exception:
+
+using System;
+
+class Hello {
+
+ static void Main()
+ {
+ MyGenericClass<int> foo = new MyGenericClass<int>();
+ foo.Generic = 10;
+ Console.WriteLine (foo);
+
+ MyGenericClass<string> bar =
+ new MyGenericClass<string>();
+ bar.Generic = "Hello, World!";
+ Console.WriteLine (bar);
+
+ MyGenericClass<double> baz =
+ new MyGenericClass<double>();
+ baz.Generic = 10.5D;
+ Console.WriteLine (baz);
+ }
+}
+
+class MyGenericClass<T> {
+
+ T var;
+
+ public T Generic {
+ set { var = value; }
+ }
+
+ public override string ToString()
+ {
+ return var.GetType().ToString();
+ }
+
+}
+
+This is the output I get when running the program.
+
+System.Int32
+System.String
+
+Unhandled Exception: System.NullReferenceException: A null value was
+found where an object instance was required.
+in (unmanaged) MyGenericClass!1:ToString ()
+in <0x0001d> System.IO.TextWriter:Write (object)
+in <0x0000e> System.IO.TextWriter:WriteLine (object)
+in <0x00035> System.IO.SynchronizedWriter:WriteLine (object)
+in <0x0001a> System.Console:WriteLine (object)
+in <0x000d6> Hello:Main ()
+
+Segmentationerror