Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/IXmlLineInfo.cs

@@ -0,0 +1,60 @@
+//------------------------------------------------------------------------------
+// <copyright file="IXmlLineInfo.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml {
+    /// <include file='doc\IXmlLineInfo.uex' path='docs/doc[@for="IXmlLineInfo"]/*' />
+    public interface IXmlLineInfo {
+        /// <include file='doc\IXmlLineInfo.uex' path='docs/doc[@for="IXmlLineInfo.HasLineInfo"]/*' />
+        bool HasLineInfo();
+        /// <include file='doc\IXmlLineInfo.uex' path='docs/doc[@for="IXmlLineInfo.LineNumber"]/*' />
+        int LineNumber { get; }
+        /// <include file='doc\IXmlLineInfo.uex' path='docs/doc[@for="IXmlLineInfo.LinePosition"]/*' />
+        int LinePosition { get; }
+    }
+
+#if !SILVERLIGHT
+    internal class PositionInfo : IXmlLineInfo {
+        public virtual bool HasLineInfo() { return false; }
+        public virtual int LineNumber { get { return 0;} }
+        public virtual int LinePosition { get { return 0;} }
+
+        public static PositionInfo GetPositionInfo(Object o) {
+            IXmlLineInfo li = o as IXmlLineInfo;
+            if (li != null) {
+                return new ReaderPositionInfo(li);
+            }
+            else {
+                return new PositionInfo();
+            }
+        }
+    }
+
+    internal class ReaderPositionInfo: PositionInfo {
+        private IXmlLineInfo lineInfo;
+
+        public ReaderPositionInfo(IXmlLineInfo lineInfo) {
+            this.lineInfo = lineInfo;
+        }
+
+        public override bool HasLineInfo() { 
+            return lineInfo.HasLineInfo(); 
+        }
+
+        public override int LineNumber { 
+            get { 
+                return lineInfo.LineNumber;
+            } 
+        }
+
+        public override int LinePosition { 
+            get { 
+                return lineInfo.LinePosition;
+            } 
+        }
+    }
+#endif
+}// namespace