Set the DbType for XmlDocument / XDocument / XElement

Dapper/XmlHandlers.cs

-using System.Xml;
+using System.Data;
+using System.Xml;
 using System.Xml.Linq;
+#if COREFX
+using IDbDataParameter = System.Data.Common.DbParameter;
+#endif
 
 namespace Dapper
 {
-    internal sealed class XmlDocumentHandler : SqlMapper.StringTypeHandler<XmlDocument>
+    internal abstract class XmlTypeHandler<T> : SqlMapper.StringTypeHandler<T>
+    {
+        public override void SetValue(IDbDataParameter parameter, T value)
+        {
+            base.SetValue(parameter, value);
+            parameter.DbType = DbType.Xml;
+        }
+    }
+    internal sealed class XmlDocumentHandler : XmlTypeHandler<XmlDocument>
     {
         protected override XmlDocument Parse(string xml)
         {
@@ -13,12 +25,12 @@ protected override XmlDocument Parse(string xml)
         }
         protected override string Format(XmlDocument xml) => xml.OuterXml;
     }
-    internal sealed class XDocumentHandler : SqlMapper.StringTypeHandler<XDocument>
+    internal sealed class XDocumentHandler : XmlTypeHandler<XDocument>
     {
         protected override XDocument Parse(string xml) => XDocument.Parse(xml);
         protected override string Format(XDocument xml) => xml.ToString();
     }
-    internal sealed class XElementHandler : SqlMapper.StringTypeHandler<XElement>
+    internal sealed class XElementHandler : XmlTypeHandler<XElement>
     {
         protected override XElement Parse(string xml) => XElement.Parse(xml);
         protected override string Format(XElement xml) => xml.ToString();