/// <summary>
/// 传入一个 dto 对象插入数据。dto 需要与实体建立映射关系，否则会报错
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <typeparam name="TDto"></typeparam>
/// <param name="dbContext"></param>
/// <param name="dto"></param>
/// <returns></returns>
public static TEntity InsertFromDto <TEntity, TDto>(this IDbContext dbContext, TDto dto)
{
/*
* 支持自动设置 主键=guid
* 支持自动设置 CreationTime=DateTime.Now
* 支持自动设置 IsDeleted=false
*/
Utils.CheckNull(dto);
TEntity entity = MrcMapper.Map <TEntity>(dto);
Type entityType = typeof(TEntity);
TypeDescriptor typeDescriptor = TypeDescriptor.GetDescriptor(entityType);
/* 设置 主键=guid */
if (typeDescriptor.PrimaryKeys.Count < 2) /* 只有无主键或单一主键的时候 */
{
MappingMemberDescriptor primaryKeyDescriptor = typeDescriptor.PrimaryKeys.FirstOrDefault();
if (primaryKeyDescriptor != null && primaryKeyDescriptor.IsAutoIncrement == false)
{
var keyValue = primaryKeyDescriptor.GetValue(entity);
if (keyValue.IsDefaultValueOfType(primaryKeyDescriptor.MemberInfoType) || string.Empty.Equals(keyValue))
{
/* 如果未设置主键值，则自动设置为 guid */
if (primaryKeyDescriptor.MemberInfoType == typeof(string))
{
primaryKeyDescriptor.SetValue(entity, IdHelper.CreateSnowflakeId().ToString());
}
else if (primaryKeyDescriptor.MemberInfoType.GetUnderlyingType() == typeof(Guid))
{
primaryKeyDescriptor.SetValue(entity, Guid.NewGuid());
}
}
}
}
/* 设置 CreationTime=DateTime.Now */
SetValueIfNeeded(entity, typeDescriptor, "CreationTime", DateTime.Now);
/* 设置 IsDeleted=false */
SetValueIfNeeded(entity, typeDescriptor, "IsDeleted", false);
return(dbContext.Insert(entity));
}
