internal static void LoadRemoveCascadeTypes(
DbContext context,
Type type,
List <Type> result = null)
{
if (result == null)
{
result = new List <Type>();
}
if (result.Contains(type))
{
return;
}
var entitiesTypes = context.Model.GetEntityTypes()
.Select(x => x.ClrType);
/// <summary>
/// 檢查是否為EF模型類型
/// </summary>
/// <param name="runtimeType">檢查類型</param>
/// <returns>是否符合 </returns>
bool TypeCheck(Type runtimeType)
{
if (runtimeType.IsGenericType &&
runtimeType.GetGenericTypeDefinition() == typeof(ICollection <>))
{
runtimeType = runtimeType.GetGenericArguments()[0];
}
return(entitiesTypes
.Contains(runtimeType));
}
if (!TypeCheck(type))
{
return;
}
result.Add(type);
var entity = FormatterServices.GetUninitializedObject(type);
var entityType = context.Model.FindRuntimeEntityType(type);
// 獲取類型中的連鎖刪除方案設定
RemoveCascadeAttribute removeCascadeAttribute = type.GetCustomAttribute <RemoveCascadeAttribute>();
if (removeCascadeAttribute == null)
{
removeCascadeAttribute = new RemoveCascadeAttribute()
{
Mode = RemoveCascadeMode.OptOut
};
}
var navs = entityType.GetNavigations();
foreach (var nav in navs)
{
if (!TypeCheck(nav.PropertyInfo.PropertyType))
{
continue;
}
if (removeCascadeAttribute.Mode == RemoveCascadeMode.OptOut)
{
var shouldRemoveCascade = type.GetMethod(
$"ShouldRemoveCascade{nav.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
false.Equals(shouldRemoveCascade.Invoke(entity, new object[0])))
{
continue;
}
if (nav.PropertyInfo.GetCustomAttribute <RemoveCascadeStopperAttribute>() != null)
{
continue;
}
var metadataType = nav.PropertyInfo.DeclaringType.GetCustomAttribute <ModelMetadataTypeAttribute>();
if (metadataType != null)
{
shouldRemoveCascade = metadataType.MetadataType.GetMethod(
$"ShouldRemoveCascade{nav.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
var metadataEntity = FormatterServices.GetUninitializedObject(metadataType.MetadataType);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
false.Equals(shouldRemoveCascade.Invoke(metadataEntity, new object[0])))
{
continue;
}
var propertyInfo = metadataType.MetadataType.GetProperty(nav.PropertyInfo.Name);
if (propertyInfo != null &&
propertyInfo.GetCustomAttribute <RemoveCascadeStopperAttribute>() != null)
{
continue;
}
}
LoadRemoveCascadeTypes(
context,
nav.GetTargetType().ClrType,
result);
}
else if (removeCascadeAttribute.Mode == RemoveCascadeMode.OptIn)
{
bool cascade = false;
var shouldRemoveCascade = type.GetMethod(
$"ShouldRemoveCascade{nav.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
true.Equals(shouldRemoveCascade.Invoke(entity, new object[0])))
{
cascade = true;
}
if (nav.PropertyInfo.GetCustomAttribute <RemoveCascadePropertyAttribute>() != null)
{
cascade = true;
}
var metadataType = nav.PropertyInfo.DeclaringType.GetCustomAttribute <ModelMetadataTypeAttribute>();
if (metadataType != null)
{
shouldRemoveCascade = metadataType.MetadataType.GetMethod(
$"ShouldRemoveCascade{nav.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
var metadataEntity = FormatterServices.GetUninitializedObject(metadataType.MetadataType);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
true.Equals(shouldRemoveCascade.Invoke(metadataEntity, new object[0])))
{
cascade = true;
}
var propertyInfo = metadataType.MetadataType.GetProperty(nav.PropertyInfo.Name);
if (propertyInfo != null &&
propertyInfo.GetCustomAttribute <RemoveCascadePropertyAttribute>() != null)
{
cascade = true;
}
}
if (!cascade)
{
continue;
}
LoadRemoveCascadeTypes(
context,
nav.GetTargetType().ClrType,
result);
}
}
}
/// <summary>
/// 取得所有關聯物件
/// </summary>
/// <param name="context">DbContext實例</param>
/// <param name="entity">Model實例</param>
/// <returns>關聯物件集合</returns>
private static IEnumerable <object> GetRefEntities(this DbContext context, object entity)
{
List <object> result = new List <object>();
var entitiesTypes = context.Model.GetEntityTypes()
.Select(x => x.ClrType);
void SetNavigationToDefault(IEntityType _currentType, IEntityType _navTargetType, object _navTargetValue)
{
//找出目標類型相依於目前類型的外來鍵屬性
foreach (var targets in _navTargetType.GetForeignKeys().Where(
// 這個外來鍵由導覽類別所定義
x => x.DeclaringEntityType == _navTargetType &&
// 並且目標為目前類別
x.PrincipalEntityType == _currentType))
{
if (_navTargetValue is IEnumerable _enumValue)
{
foreach (var element in _enumValue)
{
foreach (var fk in targets.Properties)
{
fk.PropertyInfo.SetValue(element, TypeUtility.GetDefault(fk.PropertyInfo.PropertyType));
}
}
}
else
{
foreach (var fk in targets.Properties)
{
fk.PropertyInfo.SetValue(_navTargetValue, TypeUtility.GetDefault(fk.PropertyInfo.PropertyType));
}
}
}
}
Type type = entity.GetType();
// 獲取類型中的連鎖刪除方案設定
RemoveCascadeAttribute removeCascadeAttribute = type.GetCustomAttribute <RemoveCascadeAttribute>();
if (removeCascadeAttribute == null)
{
removeCascadeAttribute = new RemoveCascadeAttribute()
{
Mode = RemoveCascadeMode.OptOut
};
}
var entityType = context.Model.FindRuntimeEntityType(type);
var navProperties = entityType.GetNavigations();
foreach (var property in navProperties)
{
var value = property.PropertyInfo.GetValue(entity);
#region 省略無需處理屬性
if (value == null)
{
continue;
}
// 略過無對應屬性
if (property.PropertyInfo.GetCustomAttribute <NotMappedAttribute>() != null)
{
continue;
}
#endregion
var shouldRemoveCascade = type.GetMethod(
$"ShouldRemoveCascade{property.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
// 選定排除
if (removeCascadeAttribute.Mode == RemoveCascadeMode.OptOut)
{
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
false.Equals(shouldRemoveCascade.Invoke(entity, new object[0])))
{
SetNavigationToDefault(entityType, property.GetTargetType(), value);
continue;
}
// 阻擋器
if (property.PropertyInfo.GetCustomAttribute <RemoveCascadeStopperAttribute>() != null)
{
SetNavigationToDefault(entityType, property.GetTargetType(), value);
continue;
}
#region ModelType
var metadataType = property.PropertyInfo.DeclaringType.GetCustomAttribute <ModelMetadataTypeAttribute>();
if (metadataType != null)
{
shouldRemoveCascade = metadataType.MetadataType.GetMethod(
$"ShouldRemoveCascade{property.PropertyInfo.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
var metadataEntity = FormatterServices.GetUninitializedObject(metadataType.MetadataType);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且不允許連鎖刪除
false.Equals(shouldRemoveCascade.Invoke(metadataEntity, new object[0])))
{
SetNavigationToDefault(entityType, property.GetTargetType(), value);
continue;
}
var propertyInfo = metadataType.MetadataType.GetProperty(property.PropertyInfo.Name);
if (propertyInfo != null &&
propertyInfo.GetCustomAttribute <RemoveCascadeStopperAttribute>() != null)
{
SetNavigationToDefault(entityType, property.GetTargetType(), value);
continue;
}
}
#endregion
if (value is IEnumerable enumValue)
{
foreach (var element in enumValue)
{
result.AddRange(GetRefEntities(context, element));
}
}
else
{
result.AddRange(GetRefEntities(context, value));
}
}
else if (removeCascadeAttribute.Mode == RemoveCascadeMode.OptIn)
{
// 是否可連鎖刪除
bool cascade = false;
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且允許連鎖刪除
true.Equals(shouldRemoveCascade.Invoke(entity, new object[0])))
{
cascade = true;
}
// 明確標記可連鎖刪除
if (property.PropertyInfo.GetCustomAttribute <RemoveCascadePropertyAttribute>() != null &&
shouldRemoveCascade == null)
{
cascade = true;
}
#region ModelType
var metadataType = property.PropertyInfo.DeclaringType.GetCustomAttribute <ModelMetadataTypeAttribute>();
if (metadataType != null)
{
shouldRemoveCascade = metadataType.MetadataType.GetMethod(
$"ShouldRemoveCascade{property.PropertyInfo.Name}",
BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
var metadataEntity = FormatterServices.GetUninitializedObject(metadataType.MetadataType);
if (shouldRemoveCascade != null && //如果存在連鎖刪除判斷方法且允許連鎖刪除
true.Equals(shouldRemoveCascade.Invoke(metadataEntity, new object[0])))
{
cascade = true;
}
var propertyInfo = metadataType.MetadataType.GetProperty(property.PropertyInfo.Name);
if (propertyInfo != null &&
propertyInfo.GetCustomAttribute <RemoveCascadePropertyAttribute>() != null &&
shouldRemoveCascade == null)
{
cascade = true;
}
}
#endregion
if (!cascade)
{
SetNavigationToDefault(entityType, property.GetTargetType(), value);
continue;
}
if (value is IEnumerable enumValue)
{
foreach (var element in enumValue)
{
result.AddRange(GetRefEntities(context, element));
}
}
else
{
result.AddRange(GetRefEntities(context, value));
}
}
}
return(result.Concat(new object[] { entity }));
}