/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="Instance"></typeparam>
/// <param name="dataRecord"></param>
/// <param name="memberName"></param>
/// <returns></returns>
public static T ReadingValueFromDataRecordTypeHandler <T, Instance>(System.Data.IDataRecord dataRecord, string memberName)
{
var attribute = TypeHandlerAttributeStorager <Instance> .Query(memberName);
if (attribute == null)
{
return(default(T));
}
return(attribute.OnDataReading <T>(dataRecord, memberName));
}
/// <summary>
/// 对对象进行emit操作
/// </summary>
/// <param name="emit">The emit.</param>
public static void BuildObject(EasyEmitBuilder <Func <IDataRecord, T> > emit)
{
var type = typeof(T);
var targetMembers = GetMembers(type);
/*实例*/
var instanceLocal = emit.DeclareLocal(type);
if (type.IsValueType)
{
if (targetMembers == null || targetMembers.Count == 0)
{
emit.LoadLocalAddress(instanceLocal);
emit.InitializeObject(type);
emit.LoadLocal(instanceLocal);
emit.Return();
return;
}
emit.LoadLocalAddress(instanceLocal);
emit.InitializeObject(type);
emit.LoadLocal(instanceLocal);
emit.StoreLocal(instanceLocal);
goto _Read;
}
else
{
/*object*/
var ctors = typeof(T).GetConstructors(BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic);
foreach (var ctor in ctors)
{
if (ctor.GetParameters().Length == 0)
{
emit.NewObject(ctor);
emit.StoreLocal(instanceLocal);
if (targetMembers == null || targetMembers.Count == 0)
{
emit.LoadLocal(instanceLocal);
emit.Return();
return;
}
goto _Read;
}
}
throw new ArgumentException(string.Format("the type {0} can not find the no parameter of ctor method", typeof(T).FullName));
}
_Read:
{
var locals = new[]
{
emit.DeclareLocal(typeof(bool)),
emit.DeclareLocal(typeof(int)),
};
var retlbl = emit.DefineLabel();
var labels = new List <ILabel>(targetMembers.Count);
for (var i = 0; i < targetMembers.Count; i++)
{
labels.Add(emit.DefineLabel());
}
for (var i = 0; i < targetMembers.Count; i++)
{
var member = targetMembers[i];
Type memberType = member.MemberType == MemberTypes.Property ? ((PropertyInfo)member).PropertyType : ((FieldInfo)member).FieldType;
if (i > 0)
{
emit.MarkLabel(labels[i]);
}
var attribute = member.GetCustomAttribute <TypeHandlerAttribute>();
if (attribute != null && attribute.TypeHandler.IsAssignableFromType(typeof(IReadingFromDataRecordToValueTypeHandler <>)))
{
TypeHandlerAttributeStorager <T> .Storage(attribute, member.Name);
if (type.IsValueType)
{
emit.LoadLocalAddress(instanceLocal);
}
else
{
emit.LoadLocal(instanceLocal);
}
emit.LoadArgument(0);
emit.LoadConstant(member.Name);
if (member.MemberType == MemberTypes.Property)
{
emit.Call(typeof(DataRecordBuilderHelper).GetMethod("ReadingValueFromDataRecordTypeHandler").MakeGenericMethod(new[] { ((PropertyInfo)member).PropertyType, type }));
emit.Call(((PropertyInfo)member).GetSetMethod(true));
}
else
{
emit.Call(typeof(DataRecordBuilderHelper).GetMethod("ReadingValueFromDataRecordTypeHandler").MakeGenericMethod(new[] { ((FieldInfo)member).FieldType, type }));
emit.StoreField(((FieldInfo)member));
}
if (i < labels.Count - 1)
{
emit.Branch(labels[i + 1]);
}
else
{
emit.Branch(retlbl);
}
continue;
}
/*reader*/
emit.LoadArgument(0);
emit.LoadConstant(member.Name);
emit.Call(DataRecordBuilderHelper._mGetOrdinal);
emit.StoreLocal(locals[1]);
emit.LoadLocal(locals[1]);
emit.LoadConstant(0);
if (i < labels.Count - 1)
{
emit.BranchIfLess(labels[i + 1]);
}
else
{
emit.BranchIfLess(retlbl);
}
emit.LoadArgument(0);
emit.LoadLocal(locals[1]);
emit.Call(DataRecordBuilderHelper._mIsDBNull);
emit.StoreLocal(locals[0]);
emit.LoadLocal(locals[0]);
if (i < labels.Count - 1)
{
emit.BranchIfTrue(labels[i + 1]);
}
else
{
emit.BranchIfTrue(retlbl);
}
if (DataRecordBuilderHelper.DefinedTypeDict.ContainsKey(memberType))
{
if (type.IsValueType)
{
emit.LoadLocalAddress(instanceLocal);
}
else
{
emit.LoadLocal(instanceLocal);
}
emit.LoadArgument(0);
emit.LoadLocal(locals[1]);
emit.Call(DataRecordBuilderHelper.DefinedTypeDict[memberType]);
if (member.MemberType == MemberTypes.Property)
{
emit.Call(((PropertyInfo)member).GetSetMethod(true));
}
else
{
emit.StoreField(((FieldInfo)member));
}
if (i < labels.Count - 1)
{
emit.Branch(labels[i + 1]);
}
else
{
emit.Branch(retlbl);
}
continue;
}
else if (memberType.IsEnum)
{
if (type.IsValueType)
{
emit.LoadLocalAddress(instanceLocal);
}
else
{
emit.LoadLocal(instanceLocal);
}
emit.LoadArgument(0);
emit.LoadLocal(locals[1]);
var underlyingType = Enum.GetUnderlyingType(memberType);
emit.Call(DataRecordBuilderHelper.DefinedTypeDict[underlyingType]);
emit.Call(typeof(DataRecordBuilderHelper).GetMethod("_EnumParse", BindingFlags.NonPublic | BindingFlags.Static).MakeGenericMethod(new[] { memberType, underlyingType }));
//emit.Call(DataRecordBuilderHelper.DefinedTypeDict[typeof(long)]);
//emit.Call(typeof(DataRecordBuilderHelper).GetMethod("_EnumParse", BindingFlags.NonPublic | BindingFlags.Static).MakeGenericMethod(memberType));
if (member.MemberType == MemberTypes.Property)
{
emit.Call(((PropertyInfo)member).GetSetMethod(true));
}
else
{
emit.StoreField(((FieldInfo)member));
}
if (i < labels.Count - 1)
{
emit.Branch(labels[i + 1]);
}
else
{
emit.Branch(retlbl);
}
continue;
}
else if (Nullable.GetUnderlyingType(memberType) != null)
{
var nullable = Nullable.GetUnderlyingType(memberType);
if (nullable.IsEnum)
{
if (type.IsValueType)
{
emit.LoadLocalAddress(instanceLocal);
}
else
{
emit.LoadLocal(instanceLocal);
}
emit.LoadArgument(0);
emit.LoadLocal(locals[1]);
var underlyingType = Enum.GetUnderlyingType(nullable);
emit.Call(DataRecordBuilderHelper.DefinedTypeDict[underlyingType]);
emit.Call(typeof(DataRecordBuilderHelper).GetMethod("_EnumParse", BindingFlags.NonPublic | BindingFlags.Static).MakeGenericMethod(new[] { nullable, underlyingType }));
//emit.Call(DataRecordBuilderHelper.DefinedTypeDict[typeof(long)]);
//emit.Call(typeof(DataRecordBuilderHelper).GetMethod("_EnumParse", BindingFlags.NonPublic | BindingFlags.Static).MakeGenericMethod(nullable));
emit.NewObject(memberType, new[] { nullable });
if (member.MemberType == MemberTypes.Property)
{
emit.Call(((PropertyInfo)member).GetSetMethod(true));
}
else
{
emit.StoreField(((FieldInfo)member));
}
if (i < labels.Count - 1)
{
emit.Branch(labels[i + 1]);
}
else
{
emit.Branch(retlbl);
}
continue;
}
if (!DataRecordBuilderHelper.DefinedTypeDict.ContainsKey(nullable))
{
continue;
}
if (type.IsValueType)
{
emit.LoadLocalAddress(instanceLocal);
}
else
{
emit.LoadLocal(instanceLocal);
}
emit.LoadArgument(0);
emit.LoadLocal(locals[1]);
emit.Call(DataRecordBuilderHelper.DefinedTypeDict[nullable]);
emit.NewObject(memberType, new[] { nullable });
if (member.MemberType == MemberTypes.Property)
{
emit.Call(((PropertyInfo)member).GetSetMethod(true));
}
else
{
emit.StoreField(((FieldInfo)member));
}
if (i < labels.Count - 1)
{
emit.Branch(labels[i + 1]);
}
else
{
emit.Branch(retlbl);
}
continue;
}
else
{
emit.Nop();
}
}
emit.MarkLabel(retlbl);
emit.LoadLocal(instanceLocal);
emit.Return();
};
return;
}