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在我的WPF應用程序中,我已經有了我的模型和sqlce數據庫。 但是現在我使用普通的參數化查詢來檢索,更新或刪除我的數據。當我已經有我的模型和數據庫時,我可以使用實體框架嗎?
我還可以使用實體框架嗎?還是爲時已晚?我的模型實現了INotifyChangedProperty(MVVM應用程序)。
現在我的AddressModel中的插入方法的一個例子。我想用實體框架來改變它。
public int InsertNewAddress(bool isnew)
{
IsNew = isnew;
try
{
ArrayList paramList = new ArrayList();
paramList.Add(new SqlCeParameter() { ParameterName = "@Id", Value = Id, DbType = DbType.Guid, Size = 16, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Street", Value = Street, DbType = DbType.String, Size = 50, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Number", Value = Number, DbType = DbType.String, Size = 10, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Bus", Value = DBNull.Value, DbType = DbType.String, Size = 5, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@ZipCode", Value = Zipcode, DbType = DbType.String, Size = 10, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@City", Value = City, DbType = DbType.String, Size = 50, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Created", Value = DateTime.Now, DbType = DbType.DateTime, Size = 23, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Modified", Value = DateTime.Now, DbType = DbType.DateTime, Size = 23, Direction = ParameterDirection.Input });
paramList.Add(new SqlCeParameter() { ParameterName = "@Country", Value = Country, DbType = DbType.String, Size = 50, Direction = ParameterDirection.Input });
StringBuilder sb = new StringBuilder();
if (IsNew) // new address, insert
{
sb.Append("INSERT INTO [RF_Address] ");
sb.Append("([Id],[Street],[Number],[Bus],[ZipCode],[City] ,[DateCreated],[DateModified], [Country]) ");
sb.Append("VALUES ");
sb.Append("(@Id, @Street, @Number, @Bus, @ZipCode, @City, @Created, @Modified, @Country)");
}
else
{
sb.Append("UPDATE [RF_Address] ");
sb.Append("SET ");
sb.Append("[Street] = @Street, [Number] = @Number, [Bus] = @Bus, [ZipCode] = @ZipCode, [City] = @City, ");
sb.Append("[DateModified] = @Modified, [Country] = @Country ");
sb.Append("WHERE [Id] = @Id");
}
int result = SqlCeHelper.ExecuteNonQuery(sb.ToString(), paramList);
if (result != 1)
throw new CustomException("Insert address failed!");
return result;
}
catch (CustomException appEx)
{
throw new CustomException(appEx.Message, appEx);
}
catch (Exception ex)
{
throw new Exception("Error InsertNewAddress: " + ex.Message, ex);
}
}
thx!
THX的快速回復。如果我理解正確,那會創建新模型嗎?我的應用程序是一個WPF MVVM應用程序,所以我的模型實現了INotifyPropertyChanged。我可以使用從實體框架生成的模型來做到這一點嗎? – PitAttack76
是的,因爲您想使用'EF',您將會強制遷移您的代碼。 –
我會在週末看它..只是爲了看看我是否理解你的答案是正確的,EF將創建新的模型,我可以使屬性INotifyPropertyChanged? – PitAttack76