/// <summary>
/// 使用一个 <see cref="MemberInitExpression"/> 表达式更新满足条件的一序列对象。
/// </summary>
/// <param name="factory">一个构造实例并成员绑定的表达式。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <returns>影响的实体数。</returns>
public int Update(Expression <Func <TEntity> > factory, Expression <Func <TEntity, bool> > predicate)
{
var entity = EntityProxyManager.GetType(typeof(TEntity)).New <TEntity>();
entity.InitByExpression(factory);
return(Update(entity, predicate));
}
/// <summary>
/// 将 Json 转换为 <paramref name="dataType"/> 的代理对象。
/// </summary>
/// <param name="serializer">当前的 <see cref="JsonSerializer"/> 对象。</param>
/// <param name="reader"><see cref="JsonReader"/> 对象。</param>
/// <param name="dataType">要反序列化的对象类型。</param>
/// <returns></returns>
public override object ReadJson(JsonSerializer serializer, JsonReader reader, Type dataType)
{
var proxyType = EntityProxyManager.GetType(dataType);
var json = reader.ReadRaw();
return(serializer.Deserialize(json, proxyType));
}
private T MapInternal(Func <PropertyMapping, PropertyValue> func)
{
var proxyType = EntityProxyManager.GetType(typeof(T));
var entity = proxyType.New <IEntity>();
if (entity == null)
{
return(default(T));
}
Initializer?.Invoke(entity);
entity.SetState(EntityState.Unchanged);
entity.As <ISupportInitializeNotification>(s => s.BeginInit());
foreach (var mapper in mapping)
{
var value = func(mapper);
entity.InitializeValue(mapper.Property, value);
}
if (alwaysProperties != null)
{
foreach (var property in alwaysProperties)
{
EntityLazyloader.AsyncLoad(entity, property);
}
}
entity.As <ISupportInitializeNotification>(s => s.EndInit());
return((T)entity);
}
/// <summary>
/// 使用一个 <see cref="MemberInitExpression"/> 表达式更新满足条件的一序列对象。
/// </summary>
/// <param name="creator">一个构造实例并成员绑定的表达式。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <returns>影响的实体数。</returns>
public virtual int Update(Expression <Func <TEntity> > creator, Expression <Func <TEntity, bool> > predicate)
{
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
entity.InitByExpression(creator);
return(predicate == null?Update(entity) : Update(entity, predicate));
}
/// <summary>
/// 异步的，使用一个 <see cref="MemberInitExpression"/> 表达式更新满足条件的一序列对象。
/// </summary>
/// <param name="factory">一个构造实例并成员绑定的表达式。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>影响的实体数。</returns>
public async Task <int> UpdateAsync(Expression <Func <TEntity> > factory, Expression <Func <TEntity, bool> > predicate, CancellationToken cancellationToken = default)
{
var entity = EntityProxyManager.GetType(typeof(TEntity)).New <TEntity>();
entity.InitByExpression(factory);
return(predicate == null ? await UpdateAsync(entity, cancellationToken) : await UpdateAsync(entity, predicate, cancellationToken));
}
/// <summary>
/// 使用一个 <see cref="MemberInitExpression"/> 表达式插入新的对象。
/// </summary>
/// <param name="factory">一个构造实例并成员绑定的表达式。</param>
/// <returns></returns>
public int Insert(Expression <Func <TEntity> > factory)
{
var entity = EntityProxyManager.GetType(typeof(TEntity)).New <TEntity>();
entity.InitByExpression(factory);
return(Insert(entity));
}
/// <summary>
/// 使用一个 <see cref="MemberInitExpression"/> 表达式插入新的对象。
/// </summary>
/// <param name="creator">一个构造实例并成员绑定的表达式。</param>
/// <returns>如果主键是自增类型，则为主键值，否则为影响的实体数。</returns>
public virtual int Insert(Expression <Func <TEntity> > creator)
{
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
entity.InitByExpression(creator);
return(Insert(entity));
}
private T MapInternal(Func <PropertyMapping, PropertyValue> func)
{
var proxyType = EntityProxyManager.GetType((Type)null, typeof(T));
var entity = proxyType.New <IEntity>();
if (entity == null)
{
return(default);
/// <summary>
/// 异步的，使用一个 <see cref="MemberInitExpression"/> 表达式插入新的对象。
/// </summary>
/// <param name="factory">一个构造实例并成员绑定的表达式。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>如果主键是自增类型，则为主键值，否则为影响的实体数。</returns>
public async Task <int> InsertAsync(Expression <Func <TEntity> > factory, CancellationToken cancellationToken = default)
{
var entity = EntityProxyManager.GetType(typeof(TEntity)).New <TEntity>();
entity.InitByExpression(factory);
return(await InsertAsync(entity, cancellationToken));
}
/// <summary>
/// 使用初始化函数将一个新的实体对象插入到库。
/// </summary>
/// <param name="initializer">一个初始化实体成员绑定的函数。</param>
/// <returns>如果主键是自增类型，则为主键值，否则为影响的实体数。</returns>
public virtual int Insert(Action <TEntity> initializer)
{
Guard.ArgumentNull(initializer, nameof(initializer));
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
initializer(entity);
return(Insert(entity));
}
/// <summary>
/// 异步的，使用一个 <see cref="MemberInitExpression"/> 表达式插入新的对象。
/// </summary>
/// <param name="creator">一个构造实例并成员绑定的表达式。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>如果主键是自增类型，则为主键值，否则为影响的实体数。</returns>
public async virtual Task <int> InsertAsync(Expression <Func <TEntity> > creator, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
entity.InitByExpression(creator);
return(await InsertAsync(entity, cancellationToken));
}
/// <summary>
/// 异步的，使用一个 <see cref="MemberInitExpression"/> 表达式更新满足条件的一序列对象。
/// </summary>
/// <param name="creator">一个构造实例并成员绑定的表达式。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>影响的实体数。</returns>
public async virtual Task <int> UpdateAsync(Expression <Func <TEntity> > creator, Expression <Func <TEntity, bool> > predicate, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
entity.InitByExpression(creator);
return(predicate == null ? await UpdateAsync(entity, cancellationToken) : await UpdateAsync(entity, predicate, cancellationToken));
}
/// <summary>
/// 使用初始化函数更新满足条件的一序列对象。
/// </summary>
/// <param name="initializer">一个初始化实体成员绑定的函数。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <returns>影响的实体数。</returns>
public virtual int Update(Action <TEntity> initializer, Expression <Func <TEntity, bool> > predicate)
{
Guard.ArgumentNull(initializer, nameof(initializer));
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
initializer(entity);
return(predicate == null?Update(entity) : Update(entity, predicate));
}
/// <summary>
/// 异步的，使用初始化函数将一个新的实体对象插入到库。
/// </summary>
/// <param name="initializer">一个初始化实体成员绑定的函数。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>如果主键是自增类型，则为主键值，否则为影响的实体数。</returns>
public async virtual Task <int> InsertAsync(Action <TEntity> initializer, CancellationToken cancellationToken = default)
{
Guard.ArgumentNull(initializer, nameof(initializer));
cancellationToken.ThrowIfCancellationRequested();
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
initializer(entity);
return(await InsertAsync(entity, cancellationToken));
}
/// <summary>
/// 异步的，使用初始化函数更新满足条件的一序列对象。
/// </summary>
/// <param name="initializer">一个初始化实体成员绑定的函数。</param>
/// <param name="predicate">用于测试每个元素是否满足条件的函数。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>影响的实体数。</returns>
public async virtual Task <int> UpdateAsync(Action <TEntity> initializer, Expression <Func <TEntity, bool> > predicate, CancellationToken cancellationToken = default)
{
Guard.ArgumentNull(initializer, nameof(initializer));
cancellationToken.ThrowIfCancellationRequested();
var entity = EntityProxyManager.GetType(ContextType, typeof(TEntity)).New <TEntity>();
initializer(entity);
return(predicate == null ? await UpdateAsync(entity, cancellationToken) : await UpdateAsync(entity, predicate, cancellationToken));
}
/// <summary>
/// 构造一个代理对象。
/// </summary>
/// <param name="applyDefaultValue">是否应用默认值。</param>
/// <returns></returns>
public static TEntity New(bool applyDefaultValue)
{
var proxyType = EntityProxyManager.GetType(typeof(TEntity));
var entity = proxyType.New <TEntity>();
if (applyDefaultValue)
{
return((TEntity)entity.ApplyDefaultValue());
}
return(entity);
}
/// <summary>
/// 构造一个实体代理对象。
/// </summary>
/// <param name="context"></param>
/// <param name="entityType">实体类型。</param>
/// <param name="applyDefaultValue">是否应用默认值。</param>
/// <returns></returns>
public static IEntity New <TContext>(this TContext context, Type entityType, bool applyDefaultValue) where TContext : EntityContext
{
var provider = (IProvider)context.GetService(typeof(IProvider));
var proxyType = EntityProxyManager.GetType(typeof(TContext), entityType);
var entity = proxyType.New <IEntity>();
if (applyDefaultValue)
{
return(entity.ApplyDefaultValue());
}
return(entity);
}
/// <summary>
/// 构造一个代理对象。
/// </summary>
/// <returns></returns>
public static TEntity New()
{
var proxyType = EntityProxyManager.GetType(typeof(TEntity));
return(proxyType.New <TEntity>());
}
/// <summary>
/// 将 Json 转换为 <paramref name="dataType"/> 的代理对象。
/// </summary>
/// <param name="serializer"></param>
/// <param name="dataType"></param>
/// <param name="json"></param>
/// <returns></returns>
public override object ReadJson(JsonSerializer serializer, Type dataType, string json)
{
var proxyType = EntityProxyManager.GetType(dataType);
return(serializer.Deserialize(json, proxyType));
}
// <summary>
// Processes the given context type to determine the EntityRepository or IRepository
// properties and collect root entity types from those properties. Also, delegates are
// created to initialize any of these properties that have public setters.
// If the type has been processed previously in the app domain, then all this information
// is returned from a cache.
// </summary>
// <returns> A dictionary of potential entity type to the list of the names of the properties that used the type. </returns>
private Dictionary <Type, List <string> > GetSets()
{
EntityContextTypesInitializersPair setsInfo;
var contextType = _context.GetType();
if (!_objectSetInitializers.TryGetValue(contextType, out setsInfo))
{
// It is possible that multiple threads will enter this code and create the list
// and the delegates. However, the result will always be the same so we may, in
// the rare cases in which this happens, do some work twice, but functionally the
// outcome will be correct.
var dbContextParam = Expression.Parameter(typeof(EntityContext), "dbContext");
var initDelegates = new List <Action <EntityContext> >();
var typeMap = new Dictionary <Type, List <string> >();
var injection = _service.Provider.GetService <IInjectionProvider>();
// Properties declared directly on DbContext such as Database are skipped
foreach (var propertyInfo in contextType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(p => p.GetIndexParameters().Length == 0 &&
p.DeclaringType != typeof(EntityContext)))
{
var entityType = GetSetType(propertyInfo.PropertyType);
if (entityType != null)
{
EntityProxyManager.CompileAll(entityType.Assembly, injection);
// We validate immediately because a DbSet/IDbSet must be of
// a valid entity type since otherwise you could never use an instance.
if (!entityType.IsValidStructuralType())
{
//throw Error.InvalidEntityType(entityType);
}
if (!typeMap.TryGetValue(entityType, out List <string> properties))
{
properties = new List <string>();
typeMap[entityType] = properties;
}
properties.Add(propertyInfo.Name);
var setter = propertyInfo.GetSetMethod();
if (setter != null && setter.IsPublic)
{
var setMethod = MthSetRep.MakeGenericMethod(entityType);
Expression expression = Expression.Call(dbContextParam, setMethod);
var pType = setter.GetParameters()[0].ParameterType;
if (pType != expression.Type)
{
expression = Expression.Convert(expression, pType);
}
var setExp = Expression.Call(
Expression.Convert(dbContextParam, contextType), setter, expression);
#if !NET35
var createExp = Expression.Call(Expression.Constant(_service), MthTryCreateRep, Expression.Constant(entityType));
var blockExp = Expression.Block(setExp, createExp);
initDelegates.Add(
Expression.Lambda <Action <EntityContext> >(blockExp, dbContextParam).Compile());
#else
initDelegates.Add(
Expression.Lambda <Action <EntityContext> >(setExp, dbContextParam).Compile());
#endif
}
}
}
Action <EntityContext> initializer = dbContext =>
{
foreach (var initer in initDelegates)
{
initer(dbContext);
}
};
setsInfo = new EntityContextTypesInitializersPair(typeMap, initializer);
// If TryAdd fails it just means some other thread got here first, which is okay
// since the end result is the same info anyway.
_objectSetInitializers.TryAdd(_context.GetType(), setsInfo);
}
return(setsInfo.EntityTypeToPropertyNameMap);
}