設計模式 C#：抽象工廠模式完整實作 - 具體工廠與產品類別 (下)

抽象工廠模式 C# 實作最後部分：兩個具體工廠與對應產品類別。

SqlMessageFactory

public class SqlMessageFactory : AbstractMessageFactory {
    public override AbstractMessageModel CreateMessageModel() 
        => new SqlMessageModel();
    public override AbstractMessage CreateMessage() 
        => new SqlMessage();
}

XMLMessageFactory

public class XMLMessageFactory : AbstractMessageFactory {
    public override AbstractMessageModel CreateMessageModel() 
        => new XMLMessageModel();
    public override AbstractMessage CreateMessage() 
        => new XMLMessage();
}

產品類別

public class SqlMessage : AbstractMessage {
    public override string Insert(AbstractMessageModel amm)
        => $"Sql方式插入Message。帳號：{amm.UserId}；內容：{amm.Message}；時間：{amm.PublishTime}";
}

public class XMLMessage : AbstractMessage {
    public override string Insert(AbstractMessageModel amm)
        => $"XML方式插入Message。帳號：{amm.UserId}；內容：{amm.Message}；時間：{amm.PublishTime}";
}

客戶端僅依賴抽象工廠與抽象產品介面，具體實作可隨配置切換，符合依賴倒置原則。