1.29: make Underscore_Names opt-in

Dapper NET40/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

Dapper NET40/SqlMapper.cs

@@ -4678,25 +4678,39 @@ public SqlMapper.IMemberMap GetConstructorParameter(ConstructorInfo constructor,
         public SqlMapper.IMemberMap GetMember(string columnName)
         {
             var property = _properties.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.Ordinal))
-               ?? _properties.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase))
-               ?? _properties.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.Ordinal))
-               ?? _properties.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.OrdinalIgnoreCase));
+               ?? _properties.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase));
+
+            if (property == null && MatchNamesWithUnderscores)
+            {
+                property = _properties.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.Ordinal))
+                    ?? _properties.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.OrdinalIgnoreCase));
+            }
 
             if (property != null)
                 return new SimpleMemberMap(columnName, property);
 
             var field = _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.Ordinal))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.Ordinal))
-               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.OrdinalIgnoreCase));
+               ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase));
+
+            if (field == null && MatchNamesWithUnderscores)
+            {
+                field = _fields.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.Ordinal))
+                    ?? _fields.FirstOrDefault(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.OrdinalIgnoreCase));
+            }
 
             if (field != null)
                 return new SimpleMemberMap(columnName, field);
 
             return null;
         }
+        /// <summary>
+        /// Should column names like User_Id be allowed to match properties/fields like UserId ?
+        /// </summary>
+        public static bool MatchNamesWithUnderscores { get; set; }
     }
 
+    
+
     /// <summary>
     /// Implements custom property mapping by user provided criteria (usually presence of some custom attribute with column to member mapping)
     /// </summary>

Dapper.Contrib.Tests/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

Dapper.Contrib/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

Dapper.SqlBuilder/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

DapperTests NET35/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

DapperTests NET35/Tests.cs

@@ -17,9 +17,17 @@ public void TestBasicStringUsage()
         }
         public void TestClassWithStringUsage()
         {
-            var arr = connection.Query<BasicType>("select 'abc' as [Value], '123' as [Another_Value] union all select @txt, @txt2", new { txt = "def", txt2 = "456" }).ToArray();
-            arr.Select(x => x.Value).IsSequenceEqualTo(new[] { "abc", "def" });
-            arr.Select(x => x.AnotherValue).IsSequenceEqualTo(new[] { "123", "456" });
+            var oldMatch = Dapper.DefaultTypeMap.MatchNamesWithUnderscores;
+            try
+            {
+                DefaultTypeMap.MatchNamesWithUnderscores = true;
+                var arr = connection.Query<BasicType>("select 'abc' as [Value], '123' as [Another_Value] union all select @txt, @txt2", new { txt = "def", txt2 = "456" }).ToArray();
+                arr.Select(x => x.Value).IsSequenceEqualTo(new[] { "abc", "def" });
+                arr.Select(x => x.AnotherValue).IsSequenceEqualTo(new[] { "123", "456" });
+            } finally
+            {
+                DefaultTypeMap.MatchNamesWithUnderscores = oldMatch;
+            }
         }
         class BasicType
         { 

DapperTests NET45/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

Tests/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.28.0.0")]
-[assembly: AssemblyFileVersion("1.28.0.0")]
+[assembly: AssemblyVersion("1.29.0.0")]
+[assembly: AssemblyFileVersion("1.29.0.0")]

dapper.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
   <metadata schemaVersion="2">
     <id>Dapper</id>
-    <version>1.28</version>
+    <version>1.29</version>
     <title>Dapper dot net</title>
     <authors>Sam Saffron,Marc Gravell</authors>
     <owners>Sam Saffron,Marc Gravell</owners>
@@ -19,6 +19,7 @@
       <frameworkAssembly assemblyName="Microsoft.CSharp" targetFramework=".NETFramework4.0-Client, .NETFramework4.0" />
     </frameworkAssemblies>
     <releaseNotes>
+      * 1.29    - Make underscore name matching optional (opt-in) - this can be a breaking change for some people
       * 1.28    - Much better numeric type conversion; fix for large oracle strings; map Foo_Bar to FooBar (etc); ExecuteScalar added; stability fixes
       * 1.27    - Fixes for type-handler parse; ensure type-handlers get last dibs on configuring parameters
       * 1.26    - New type handler API for extension support