1 files changed, 89 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Runtime/InteropServices/ExternalException.cs b/src/mscorlib/shared/System/Runtime/InteropServices/ExternalException.cs
new file mode 100644
index 0000000000..d7bde79c43
--- /dev/null
+++ b/src/mscorlib/shared/System/Runtime/InteropServices/ExternalException.cs
@@ -0,0 +1,89 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=============================================================================
+**
+**
+**
+** Purpose: Exception base class for all errors from Interop or Structured 
+**          Exception Handling code.
+**
+**
+=============================================================================*/
+
+using System;
+using System.Globalization;
+using System.Runtime.Serialization;
+
+namespace System.Runtime.InteropServices
+{
+    // Base exception for COM Interop errors &; Structured Exception Handler
+    // exceptions.
+    // 
+    [Serializable]
+    public class ExternalException : SystemException
+    {
+        public ExternalException()
+            : base(SR.Arg_ExternalException)
+        {
+            HResult = __HResults.E_FAIL;
+        }
+
+        public ExternalException(string message)
+            : base(message)
+        {
+            HResult = __HResults.E_FAIL;
+        }
+
+        public ExternalException(string message, Exception inner)
+            : base(message, inner)
+        {
+            HResult = __HResults.E_FAIL;
+        }
+
+        public ExternalException(string message, int errorCode)
+            : base(message)
+        {
+            HResult = errorCode;
+        }
+
+        protected ExternalException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+        }
+
+        public virtual int ErrorCode
+        {
+            get
+            {
+                return HResult;
+            }
+        }
+
+        public override string ToString()
+        {
+            string message = Message;
+            string className = GetType().ToString();
+
+            string s = className + " (0x" + HResult.ToString("X8", CultureInfo.InvariantCulture) + ")";
+
+            if (!(String.IsNullOrEmpty(message)))
+            {
+                s = s + ": " + message;
+            }
+
+            Exception innerException = InnerException;
+
+            if (innerException != null)
+            {
+                s = s + " ---> " + innerException.ToString();
+            }
+
+            if (StackTrace != null)
+                s += Environment.NewLine + StackTrace;
+
+            return s;
+        }
+    }
+}