Add GetFieldValue(Async)<T> support for XmlReader, TextReader, Stream (#1019)

Author: Wraith2

doc/snippets/Microsoft.Data.SqlClient/SqlDataReader.xml

@@ -319,7 +319,8 @@
             <summary>Synchronously gets the value of the specified column as a type. <see cref="M:Microsoft.Data.SqlClient.SqlDataReader.GetFieldValueAsync``1(System.Int32,System.Threading.CancellationToken)" /> is the asynchronous version of this method.</summary>
             <returns>The returned type object.</returns>
             <remarks>
-            <format type="text/markdown"><![CDATA[  
+            <format type="text/markdown">
+  <![CDATA[  
   
 ## Remarks  
  `T` can be one of the following types:  
@@ -332,7 +333,8 @@
 |SqlBoolean|SqlByte|SqlDateTime|SqlDecimal|  
 |SqlDouble|SqlGuid|SqlInt16|SqlInt32|  
 |SqlInt64|SqlMoney|SqlSingle|SqlString|  
-|String|UDT, which can be any CLR type marked with <xref:Microsoft.Data.SqlClient.Server.SqlUserDefinedTypeAttribute>.|||  
+|Stream|String|TextReader|UDT, which can be any CLR type marked with <xref:Microsoft.Data.SqlClient.Server.SqlUserDefinedTypeAttribute>.|
+|XmlReader||||
   
  For more information, see [SqlClient Streaming Support](/sql/connect/ado-net/sqlclient-streaming-support).  
   
@@ -359,7 +361,8 @@
             <summary>Asynchronously gets the value of the specified column as a type. <see cref="M:Microsoft.Data.SqlClient.SqlDataReader.GetFieldValue``1(System.Int32)" /> is the synchronous version of this method.</summary>
             <returns>The returned type object.</returns>
             <remarks>
-            <format type="text/markdown"><![CDATA[  
+            <format type="text/markdown">
+    <![CDATA[  
   
 ## Remarks  
  `T` can be one of the following types:  
@@ -372,7 +375,8 @@
 |SqlBoolean|SqlByte|SqlDateTime|SqlDecimal|  
 |SqlDouble|SqlGuid|SqlInt16|SqlInt32|  
 |SqlInt64|SqlMoney|SqlSingle|SqlString|  
-|String|UDT, which can be any CLR type marked with <xref:Microsoft.Data.SqlClient.Server.SqlUserDefinedTypeAttribute>.|||  
+|Stream|String|TextReader|UDT, which can be any CLR type marked with <xref:Microsoft.Data.SqlClient.Server.SqlUserDefinedTypeAttribute>.|
+|XmlReader||||
   
  For more information, see [SqlClient Streaming Support](/sql/connect/ado-net/sqlclient-streaming-support).  
   

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlCachedBuffer.cs

@@ -133,7 +133,7 @@ internal SqlXml ToSqlXml()
         [MethodImpl(MethodImplOptions.NoInlining)]
         internal XmlReader ToXmlReader()
         {
-            return SqlTypeWorkarounds.SqlXmlCreateSqlXmlReader(ToStream(), closeInput: false);
+            return SqlTypeWorkarounds.SqlXmlCreateSqlXmlReader(ToStream(), closeInput: false, async: false);
         }
 
         public bool IsNull

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlDataReader.cs

@@ -7,9 +7,9 @@
 using System.Data.SqlTypes;
 using System.Diagnostics;
 using System.IO;
-using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Xml;
+using Microsoft.Data.SqlTypes;
 
 namespace Microsoft.Data.SqlClient
 {
@@ -134,26 +134,7 @@ internal SqlXml ToSqlXml()
         [MethodImpl(MethodImplOptions.NoInlining)]
         internal XmlReader ToXmlReader()
         {
-            //XmlTextReader xr = new XmlTextReader(fragment, XmlNodeType.Element, null);
-            XmlReaderSettings readerSettings = new XmlReaderSettings();
-            readerSettings.ConformanceLevel = ConformanceLevel.Fragment;
-
-            // Call internal XmlReader.CreateSqlReader from System.Xml.
-            // Signature: internal static XmlReader CreateSqlReader(Stream input, XmlReaderSettings settings, XmlParserContext inputContext);
-            MethodInfo createSqlReaderMethodInfo = typeof(System.Xml.XmlReader).GetMethod("CreateSqlReader", BindingFlags.Static | BindingFlags.NonPublic);
-            object[] args = new object[3] { ToStream(), readerSettings, null };
-            XmlReader xr;
-
-            new System.Security.Permissions.ReflectionPermission(System.Security.Permissions.ReflectionPermissionFlag.MemberAccess).Assert();
-            try
-            {
-                xr = (XmlReader)createSqlReaderMethodInfo.Invoke(null, args);
-            }
-            finally
-            {
-                System.Security.Permissions.ReflectionPermission.RevertAssert();
-            }
-            return xr;
+            return SqlTypeWorkarounds.SqlXmlCreateSqlXmlReader(ToStream(), closeInput: false, async: false);
         }
 
         public bool IsNull
@@ -163,7 +144,5 @@ public bool IsNull
                 return (_cachedBytes == null) ? true : false;
             }
         }
-
     }
-
 }