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DefaultTypeMap.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
namespace Dapper
{
/// <summary>
/// Represents default type mapping strategy used by Dapper
/// </summary>
public sealed class DefaultTypeMap : SqlMapper.ITypeMap
{
private readonly List<FieldInfo> _fields;
private readonly Type _type;
/// <summary>
/// Creates default type map
/// </summary>
/// <param name="type">Entity type</param>
public DefaultTypeMap(Type type)
{
if (type == null)
throw new ArgumentNullException(nameof(type));
_fields = GetSettableFields(type);
Properties = GetSettableProps(type);
_type = type;
}
internal static MethodInfo GetPropertySetter(PropertyInfo propertyInfo, Type type)
{
if (propertyInfo.DeclaringType == type) return propertyInfo.GetSetMethod(true);
return propertyInfo.DeclaringType.GetProperty(
propertyInfo.Name,
BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance,
Type.DefaultBinder,
propertyInfo.PropertyType,
propertyInfo.GetIndexParameters().Select(p => p.ParameterType).ToArray(),
null).GetSetMethod(true);
}
internal static List<PropertyInfo> GetSettableProps(Type t)
{
return t
.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.Where(p => GetPropertySetter(p, t) != null)
.ToList();
}
internal static List<FieldInfo> GetSettableFields(Type t)
{
return t.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).ToList();
}
/// <summary>
/// Finds best constructor
/// </summary>
/// <param name="names">DataReader column names</param>
/// <param name="types">DataReader column types</param>
/// <returns>Matching constructor or default one</returns>
public ConstructorInfo FindConstructor(string[] names, Type[] types)
{
var constructors = _type.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
foreach (ConstructorInfo ctor in constructors.OrderBy(c => c.IsPublic ? 0 : (c.IsPrivate ? 2 : 1)).ThenBy(c => c.GetParameters().Length))
{
ParameterInfo[] ctorParameters = ctor.GetParameters();
if (ctorParameters.Length == 0)
return ctor;
if (ctorParameters.Length != types.Length)
continue;
int i = 0;
for (; i < ctorParameters.Length; i++)
{
if (!string.Equals(ctorParameters[i].Name, names[i], StringComparison.OrdinalIgnoreCase))
break;
if (types[i] == typeof(byte[]) && ctorParameters[i].ParameterType.FullName == SqlMapper.LinqBinary)
continue;
var unboxedType = Nullable.GetUnderlyingType(ctorParameters[i].ParameterType) ?? ctorParameters[i].ParameterType;
if ((unboxedType != types[i] && !SqlMapper.HasTypeHandler(unboxedType))
&& !(unboxedType.IsEnum && Enum.GetUnderlyingType(unboxedType) == types[i])
&& !(unboxedType == typeof(char) && types[i] == typeof(string))
&& !(unboxedType.IsEnum && types[i] == typeof(string)))
{
break;
}
}
if (i == ctorParameters.Length)
return ctor;
}
return null;
}
/// <summary>
/// Returns the constructor, if any, that has the ExplicitConstructorAttribute on it.
/// </summary>
public ConstructorInfo FindExplicitConstructor()
{
var constructors = _type.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
var withAttr = constructors.Where(c => c.GetCustomAttributes(typeof(ExplicitConstructorAttribute), true).Length > 0).ToList();
if (withAttr.Count == 1)
{
return withAttr[0];
}
return null;
}
/// <summary>
/// Gets mapping for constructor parameter
/// </summary>
/// <param name="constructor">Constructor to resolve</param>
/// <param name="columnName">DataReader column name</param>
/// <returns>Mapping implementation</returns>
public SqlMapper.IMemberMap GetConstructorParameter(ConstructorInfo constructor, string columnName)
{
var parameters = constructor.GetParameters();
return new SimpleMemberMap(columnName, parameters.FirstOrDefault(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase)));
}
/// <summary>
/// Gets member mapping for column
/// </summary>
/// <param name="columnName">DataReader column name</param>
/// <returns>Mapping implementation</returns>
public SqlMapper.IMemberMap GetMember(string columnName)
{
var property = Properties.Find(p => string.Equals(p.Name, columnName, StringComparison.Ordinal))
?? Properties.Find(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase));
if (property == null && MatchNamesWithUnderscores)
{
property = Properties.Find(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.Ordinal))
?? Properties.Find(p => string.Equals(p.Name, columnName.Replace("_", ""), StringComparison.OrdinalIgnoreCase));
}
if (property != null)
return new SimpleMemberMap(columnName, property);
// roslyn automatically implemented properties, in particular for get-only properties: <{Name}>k__BackingField;
var backingFieldName = "<" + columnName + ">k__BackingField";
// preference order is:
// exact match over underscore match, exact case over wrong case, backing fields over regular fields, match-inc-underscores over match-exc-underscores
var field = _fields.Find(p => string.Equals(p.Name, columnName, StringComparison.Ordinal))
?? _fields.Find(p => string.Equals(p.Name, backingFieldName, StringComparison.Ordinal))
?? _fields.Find(p => string.Equals(p.Name, columnName, StringComparison.OrdinalIgnoreCase))
?? _fields.Find(p => string.Equals(p.Name, backingFieldName, StringComparison.OrdinalIgnoreCase));
if (field == null && MatchNamesWithUnderscores)
{
var effectiveColumnName = columnName.Replace("_", "");
backingFieldName = "<" + effectiveColumnName + ">k__BackingField";
field = _fields.Find(p => string.Equals(p.Name, effectiveColumnName, StringComparison.Ordinal))
?? _fields.Find(p => string.Equals(p.Name, backingFieldName, StringComparison.Ordinal))
?? _fields.Find(p => string.Equals(p.Name, effectiveColumnName, StringComparison.OrdinalIgnoreCase))
?? _fields.Find(p => string.Equals(p.Name, backingFieldName, 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>
/// The settable properties for this typemap
/// </summary>
public List<PropertyInfo> Properties { get; }
}
}