現在、自分のニーズに合わせて変更しているソリューションを見つけました。
コードは次のとおりです。
での SaveChanges クラスのオーバーライド
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
これらのメソッドを追加します。
public async Task SaveChangesAsync(string userId)
{
// Get all Added/Deleted/Modified entities (not Unmodified or Detached)
foreach (var ent in this.ChangeTracker.Entries().Where(p => p.State == EntityState.Added || p.State == EntityState.Deleted || p.State == EntityState.Modified))
{
// For each changed record, get the audit record entries and add them
foreach (Log x in GetAuditRecordsForChange(ent, userId))
{
this.Log.Add(x);
}
}
// Call the original SaveChanges(), which will save both the changes made and the audit records
await base.SaveChangesAsync();
}
private List<Log> GetAuditRecordsForChange(DbEntityEntry dbEntry, string userId)
{
List<Log> result = new List<Log>();
DateTime changeTime = DateTime.Now;
// Get the Table() attribute, if one exists
TableAttribute tableAttr = dbEntry.Entity.GetType().GetCustomAttributes(typeof(TableAttribute), false).SingleOrDefault() as TableAttribute;
// Get table name (if it has a Table attribute, use that, otherwise get the pluralized name)
string tableName = tableAttr != null ? tableAttr.Name : dbEntry.Entity.GetType().Name;
// Get primary key value (If you have more than one key column, this will need to be adjusted)
string keyName = dbEntry.Entity.GetType().GetProperties().Single(p => p.GetCustomAttributes(typeof(KeyAttribute), false).Count() > 0).Name;
if (dbEntry.State == EntityState.Added)
{
// For Inserts, just add the whole record
// If the entity implements IDescribableEntity, use the description from Describe(), otherwise use ToString()
result.Add(new Log()
{
LogID = Guid.NewGuid(),
EventType = "A", // Added
TableName = tableName,
RecordID = dbEntry.CurrentValues.GetValue<object>(keyName).ToString(), // Again, adjust this if you have a multi-column key
ColumnName = "*ALL", // Or make it nullable, whatever you want
NewValue = (dbEntry.CurrentValues.ToObject() is IDescribableEntity) ? (dbEntry.CurrentValues.ToObject() as IDescribableEntity).Describe() : dbEntry.CurrentValues.ToObject().ToString(),
Created_by = userId,
Created_date = changeTime
}
);
}
else if (dbEntry.State == EntityState.Deleted)
{
// Same with deletes, do the whole record, and use either the description from Describe() or ToString()
result.Add(new Log()
{
LogID = Guid.NewGuid(),
EventType = "D", // Deleted
TableName = tableName,
RecordID = dbEntry.OriginalValues.GetValue<object>(keyName).ToString(),
ColumnName = "*ALL",
NewValue = (dbEntry.OriginalValues.ToObject() is IDescribableEntity) ? (dbEntry.OriginalValues.ToObject() as IDescribableEntity).Describe() : dbEntry.OriginalValues.ToObject().ToString(),
Created_by = userId,
Created_date = changeTime
}
);
}
else if (dbEntry.State == EntityState.Modified)
{
foreach (string propertyName in dbEntry.OriginalValues.PropertyNames)
{
// For updates, we only want to capture the columns that actually changed
if (!object.Equals(dbEntry.OriginalValues.GetValue<object>(propertyName), dbEntry.CurrentValues.GetValue<object>(propertyName)))
{
result.Add(new Log()
{
LogID = Guid.NewGuid(),
EventType = "M", // Modified
TableName = tableName,
RecordID = dbEntry.OriginalValues.GetValue<object>(keyName).ToString(),
ColumnName = propertyName,
OriginalValue = dbEntry.OriginalValues.GetValue<object>(propertyName) == null ? null : dbEntry.OriginalValues.GetValue<object>(propertyName).ToString(),
NewValue = dbEntry.CurrentValues.GetValue<object>(propertyName) == null ? null : dbEntry.CurrentValues.GetValue<object>(propertyName).ToString(),
Created_by = userId,
Created_date = changeTime
}
);
}
}
}
// Otherwise, don't do anything, we don't care about Unchanged or Detached entities
return result;
}
public DbSet<Log> Log { get; set; }
そして、ここにログクラスがあります
[Table("N_Log")]
public class Log
{
[Key]
public Guid LogID { get; set; }
[Required]
public string EventType { get; set; }
[Required]
public string TableName { get; set; }
public string ActionID { get; set; }
[Required]
public string RecordID { get; set; }
[Required]
public string ColumnName { get; set; }
public string OriginalValue { get; set; }
public string NewValue { get; set; }
[Required]
public string Created_by { get; set; }
[Required]
public DateTime Created_date { get; set; }
}