/// <summary>
/// 生成实体映射委托
/// </summary>
/// <param name="type">实体类型</param>
/// <param name="reader">数据读取器</param>
/// <param name="columns">字段列描述</param>
/// <param name="start">开始索引</param>
/// <param name="end">结束索引</param>
/// <returns></returns>
public Func <IDataRecord, object> GetTypeDeserializer(Type type, IDataRecord reader, ColumnDescriptorCollection columns = null, int start = 0, int?end = null)
{
//// specify a new assembly name
//var assemblyName = new AssemblyName("Riz.Deserialize");
//// create assembly builder
//var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave);
//// create module builder
//var moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name, assemblyName.Name + ".dll", true);
//// create type builder for a class
//var typeBuilder = moduleBuilder.DefineType("Riz.Deserialize.Deserializer", TypeAttributes.Public);
//// create method builder
//var methodBuilder = typeBuilder.DefineMethod("GetModel",
// MethodAttributes.Public | MethodAttributes.Static,
// typeof(object),
// new Type[] { typeof(IDataRecord)
// });
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
DynamicMethod dynamicMethod = new DynamicMethod(string.Format("Deserialize{0}", Guid.NewGuid()), typeof(object), new Type[] { typeof(IDataRecord) }, true);
//ILGenerator il = methodBuilder.GetILGenerator();
ILGenerator il = dynamicMethod.GetILGenerator();
il.DeclareLocal(typeof(int)); // [0] int index
il.DeclareLocal(type); // [1] {type}
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Stloc_0);
// 有参构造函数
ConstructorInfo specializedConstructor = null;
if (type.IsValueType)
{
// 如果是值类型，则将值类型设置为空或者0
il.Emit(OpCodes.Ldloca_S, (byte)1);
il.Emit(OpCodes.Initobj, type);
}
else
{
var ctor = typeRuntime.Constructor.Member;
if (ctor.GetParameters().Length > 0)
{
specializedConstructor = ctor;
}
else
{
// 如果不是匿名类或者只有无参构造函数，则new一个对象
il.Emit(OpCodes.Newobj, ctor);
il.Emit(OpCodes.Stloc_1); // [1] {type}=new {type}
}
}
// try #####
il.BeginExceptionBlock();
if (specializedConstructor == null)
{
il.Emit(OpCodes.Ldloc_1); // [target]
}
// stack is now [target]
Label finishLabel = il.DefineLabel();
Label loadNullLabel = il.DefineLabel();
int enumDeclareLocal = -1;
if (end == null)
{
end = reader.FieldCount;
}
for (int index = start; index < end; index++)
{
// 找出对应DataReader中的字段名
string memberName = reader.GetName(index);
if (columns != null)
{
ColumnDescriptor column = null;
columns.TryGetValue(memberName, out column);
memberName = column != null ? column.Name : string.Empty;
}
// 本地变量赋值
il.Emit(OpCodes.Ldc_I4, index); // [target][index]
il.Emit(OpCodes.Stloc_0); // [target]
// 如果导航属性分割列=DbNull，那么此导航属性赋空值
if (memberName == AppConst.NAVIGATION_SPLITON_NAME)
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldc_I4, index);
il.Emit(OpCodes.Callvirt, _isDBNull);
il.Emit(OpCodes.Brtrue_S, loadNullLabel);
}
var m = typeRuntime.GetMember(memberName) as FieldAccessorBase;
if (m == null)
{
continue;
}
if (specializedConstructor == null)
{
il.Emit(OpCodes.Dup); // stack is now [target][target]
}
// 数据字段类型
Type readerFieldType = reader.GetFieldType(index);
Type realReaderFieldType = readerFieldType;
// 实体属性类型
Type entityFieldType = m.CLRType;
MethodInfo getFieldValue = this.GetReaderMethod(readerFieldType, entityFieldType, ref realReaderFieldType);
if (readerFieldType != realReaderFieldType)
{
readerFieldType = realReaderFieldType;
}
Label isDbNullLabel = il.DefineLabel();
Label nextLoopLabel = il.DefineLabel();
// 判断字段是否是 DbNull
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldc_I4, index);
il.Emit(OpCodes.Callvirt, _isDBNull);
il.Emit(OpCodes.Brtrue, isDbNullLabel);
// =>DataReader.Getxx(index)
il.Emit(OpCodes.Ldarg_0); // stack is now [target][target][reader]
if (getFieldValue.DeclaringType != typeof(IDataRecord))
{
il.Emit(OpCodes.Castclass, getFieldValue.DeclaringType); // (SqlDataReader)IDataReader
}
il.Emit(OpCodes.Ldc_I4, index); // stack is now [target][target][reader][index]
il.Emit(OpCodes.Callvirt, getFieldValue); // stack is now [target][target][value-or-object]
if (entityFieldType == typeof(char) || entityFieldType == typeof(char?))
{
il.EmitCall(OpCodes.Call, entityFieldType == typeof(char) ? _readChar : _readNullChar, null); // stack is now [target][target][typed-value]
}
else
{
// unbox nullable enums as the primitive, i.e. byte etc
var nullUnderlyingType = Nullable.GetUnderlyingType(entityFieldType);
var unboxType = nullUnderlyingType != null && nullUnderlyingType.IsEnum ? nullUnderlyingType : entityFieldType;
if (unboxType.IsEnum)
{
Type numericType = Enum.GetUnderlyingType(unboxType);
if (readerFieldType != typeof(string))
{
ConvertBoxedStack(il, readerFieldType, unboxType, numericType);
}
else
{
if (enumDeclareLocal == -1)
{
enumDeclareLocal = il.DeclareLocal(typeof(string)).LocalIndex;
}
il.Emit(OpCodes.Castclass, typeof(string)); // stack is now [target][target][string]
il.StoreLocal(enumDeclareLocal); // stack is now [target][target]
il.Emit(OpCodes.Ldtoken, unboxType); // stack is now [target][target][enum-type-token]
il.EmitCall(OpCodes.Call, _typeFromHandle, null); // stack is now [target][target][enum-type]
il.LoadLocal(enumDeclareLocal); // stack is now [target][target][enum-type][string]
il.Emit(OpCodes.Ldc_I4_1); // stack is now [target][target][enum-type][string][true]
il.EmitCall(OpCodes.Call, _enumParse, null); // stack is now [target][target][enum-as-object]
il.Emit(OpCodes.Unbox_Any, unboxType); // stack is now [target][target][typed-value]
}
// new Nullable<TValue>(TValue)
if (nullUnderlyingType != null)
{
EmitNewNullable(il, entityFieldType); // stack is now [target][target][typed-value]
}
}
else if (entityFieldType.FullName == _linqBinaryName)
{
var ctor = entityFieldType.GetConstructor(new Type[] { typeof(byte[]) });
il.Emit(OpCodes.Unbox_Any, typeof(byte[])); // stack is now [target][target][byte-array]
il.Emit(OpCodes.Newobj, ctor); // stack is now [target][target][binary]
}
else
{
bool noBoxed = readerFieldType == unboxType || readerFieldType == nullUnderlyingType;
// myFieldType和实体属性类型一致， 如果用 DataReader.GetValue，则要强制转换{object}为实体属性定义的类型
bool useCast = noBoxed && getFieldValue == _getValue && unboxType != typeof(object);
if (useCast)
{
il.EmitCast(nullUnderlyingType ?? unboxType); // stack is now [target][target][typed-value]
}
// myFieldType和实体属性类型不一致，需要做类型转换
if (!noBoxed)
{
if (getFieldValue == _getValue && readerFieldType.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, readerFieldType); // stack is now [target][target][value]
}
// not a direct match; need to tweak the unbox
ConvertBoxedStack(il, readerFieldType, nullUnderlyingType ?? unboxType, null);
}
// new Nullable<TValue>(TValue)
if (nullUnderlyingType != null)
{
EmitNewNullable(il, entityFieldType); // stack is now [target][target][typed-value]
}
}
}
if (specializedConstructor == null)
{
// Store the value in the property/field
if (m.MemberType == MemberTypes.Field)
{
il.Emit(OpCodes.Stfld, m.Member as FieldInfo); // stack is now [target]
}
else
{
MethodInfo setMethod = (m as PropertyAccessor).Member.GetSetMethod(true);
il.Emit(type.IsValueType ? OpCodes.Call : OpCodes.Callvirt, setMethod);// stack is now [target]
}
}
il.Emit(OpCodes.Br_S, nextLoopLabel); // stack is now [target]
il.MarkLabel(isDbNullLabel); // incoming stack: [target][target]
if (specializedConstructor == null)
{
il.Emit(OpCodes.Pop); // stack is now [target]
}
else
{
// DbNull，将NULL或者0推到栈顶
if (!entityFieldType.IsValueType)
{
il.Emit(OpCodes.Ldnull);
}
else
{
int localIndex = il.DeclareLocal(entityFieldType).LocalIndex;
il.LoadLocalAddress(localIndex);
il.Emit(OpCodes.Initobj, entityFieldType);
il.LoadLocal(localIndex);
}
}
il.MarkLabel(nextLoopLabel);
}
if (specializedConstructor != null)
{
il.Emit(OpCodes.Newobj, specializedConstructor);
}
il.Emit(OpCodes.Stloc_1); // stack is empty
// 直接跳到结束标签返回实体
il.Emit(OpCodes.Br, finishLabel);
// 将 null 赋值给实体
il.MarkLabel(loadNullLabel);
il.Emit(OpCodes.Pop);
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Stloc_1);
il.MarkLabel(finishLabel);
il.BeginCatchBlock(typeof(Exception)); // stack is Exception
il.Emit(OpCodes.Ldloc_0); // stack is Exception, index
il.Emit(OpCodes.Ldarg_0); // stack is Exception, index, reader
il.EmitCall(OpCodes.Call, _throwException, null);
il.EndExceptionBlock();
il.Emit(OpCodes.Ldloc_1); // stack is [rval]
il.Emit(OpCodes.Ret);
//// then create the whole class type
//typeBuilder.CreateType();
//// save assembly
//assemblyBuilder.Save(assemblyName.Name + ".dll");
return((Func <IDataRecord, object>)dynamicMethod.CreateDelegate(typeof(Func <IDataRecord, object>)));
}
// 反序列化导航属性
// @prevLine 前一行数据
// @isLine 是否同一行数据<同一父级>
void Deserialize_Navigation(object prevModel, object model, string typeName, bool isThisLine)
{
// CRM_SaleOrder.Client
// CRM_SaleOrder.Client.AccountList
Type type = model.GetType();
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
if (string.IsNullOrEmpty(typeName))
{
typeName = type.Name;
}
//foreach (var kvp in _map.Navigations)
foreach (var navigation in _map.SelectedNavs)
{
int start = -1;
int end = -1;
if (navigation.FieldCount > 0)
{
start = navigation.StartIndex;
end = navigation.StartIndex + navigation.FieldCount;
}
string keyName = typeName + "." + navigation.Name;
if (keyName != navigation.Key)
{
continue;
}
var navMember = typeRuntime.GetMember <FieldAccessorBase>(navigation.Name);
if (navMember == null)
{
continue;
}
Type navType = navMember.CLRType;
Func <IDataRecord, object> deserializer = null;
TypeRuntimeInfo navTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navType);
object navCollection = null;
if (TypeUtils.IsCollectionType(navType))
{
// 1：n关系，导航属性为 List<T>
navCollection = navMember.Invoke(model);
if (navCollection == null)
{
// new 一个列表类型，如果导航属性定义为接口，则默认使用List<T>来实例化
TypeRuntimeInfo navTypeRuntime2 = navType.IsInterface
? TypeRuntimeInfoCache.GetRuntimeInfo(typeof(List <>).MakeGenericType(navTypeRuntime.GenericArguments[0]))
: navTypeRuntime;
navCollection = navTypeRuntime2.Constructor.Invoke();
navMember.Invoke(model, navCollection);
}
}
if (!_deserializers.TryGetValue(keyName, out deserializer))
{
deserializer = _deserializerImpl.GetTypeDeserializer(navType.IsGenericType ? navTypeRuntime.GenericArguments[0] : navType, _reader, _map.SelectedColumns, start, end);
_deserializers[keyName] = deserializer;
}
// 如果整个导航链中某一个导航属性为空，则跳出递归
object navModel = deserializer(_reader);
if (navModel != null)
{
if (navCollection == null)
{
// 非集合型导航属性
navMember.Invoke(model, navModel);
//
//
//
}
else
{
// 集合型导航属性
if (prevModel != null && isThisLine)
{
#region 合并列表
// 判断如果属于同一个主表，则合并到上一行的当前明细列表
// 例：CRM_SaleOrder.Client.AccountList
string[] keys = keyName.Split('.');
TypeRuntimeInfo curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(_entityType);
Type curType = curTypeRuntime.Type;
MemberAccessorBase curAccessor = null;
object curModel = prevModel;
for (int i = 1; i < keys.Length; i++)
{
curAccessor = curTypeRuntime.GetMember(keys[i]);
curModel = curAccessor.Invoke(curModel);
if (curModel == null)
{
continue;
}
curType = curModel.GetType();
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curType);
// <<<<<<<<<<< 一对多对多关系 >>>>>>>>>>
if (curType.IsGenericType && i != keys.Length - 1)
{
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curType);
//if (curTypeRuntime.GenericTypeDefinition == typeof(List<>))
if (TypeUtils.IsCollectionType(curType))
{
var member_Count = curTypeRuntime.GetMember("get_Count");
int count = Convert.ToInt32(member_Count.Invoke(curModel)); // List.Count
if (count > 0)
{
var member_Index = curTypeRuntime.GetMember("get_Item");
curModel = member_Index.Invoke(curModel, count - 1); // List[List.Count-1]
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curModel.GetType());
}
else
{
// user.Roles.RoleFuncs=>Roles 列表有可能为空
curModel = null;
break;
}
}
}
}
if (curModel != null)
{
// 如果有两个以上的一对多关系的导航属性，那么在加入列表之前就需要剔除重复的实体
bool isAny = false;
if (_map.SelectedNavs.Count > 1)
{
if (_manyNavigationNumber == null)
{
_manyNavigationNumber = _map.SelectedNavs.Count(x => HasMany(x.Member));
}
if (_manyNavigationNumber != null && _manyNavigationNumber.Value > 1)
{
if (!_manyNavigationKeys.ContainsKey(keyName))
{
_manyNavigationKeys[keyName] = new HashSet <string>();
}
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navModel.GetType());
StringBuilder keyBuilder = new StringBuilder(64);
foreach (var m in curTypeRuntime.KeyMembers)
{
var value = m.Invoke(navModel);
keyBuilder.AppendFormat("{0}={1};", m.Name, (value ?? string.Empty).ToString());
}
string hash = keyBuilder.ToString();
if (_manyNavigationKeys[keyName].Contains(hash))
{
isAny = true;
}
else
{
_manyNavigationKeys[keyName].Add(hash);
}
}
}
if (!isAny)
{
// 如果列表中不存在，则添加到上一行的相同导航列表中去
var member_Add = navTypeRuntime.GetMember("Add");
member_Add.Invoke(curModel, navModel);
}
}
#endregion
}
else
{
// 此时的 navTypeRuntime 是 List<> 类型的运行时
// 先添加 List 列表
var member_Add = navTypeRuntime.GetMember("Add");
member_Add.Invoke(navCollection, navModel);
var curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navModel.GetType());
StringBuilder keyBuilder = new StringBuilder(64);
foreach (var m in curTypeRuntime.KeyMembers)
{
var value = m.Invoke(navModel);
keyBuilder.AppendFormat("{0}={1};", m.Name, (value ?? string.Empty).ToString());
}
string hash = keyBuilder.ToString();
if (!_manyNavigationKeys.ContainsKey(keyName))
{
_manyNavigationKeys[keyName] = new HashSet <string>();
}
if (!_manyNavigationKeys[keyName].Contains(hash))
{
_manyNavigationKeys[keyName].Add(hash);
}
}
}
if (TypeUtils.IsCollectionType(navTypeRuntime.Type))
{
navTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navTypeRuntime.GenericArguments[0]);
}
if (navTypeRuntime.NavMembers.Count > 0)
{
Deserialize_Navigation(prevModel, navModel, keyName, isThisLine);
}
}
}
}
