我可以在C＃

Question

结合构造，我有以下代码：

public AccountService(ModelStateDictionary modelStateDictionary, string dataSourceID) 
    { 
     this._modelState = modelStateDictionary; 
     this._accountRepository = StorageHelper.GetTable<Account>(dataSourceID); 
     this._productRepository = StorageHelper.GetTable<Product>(dataSourceID); 
    } 

    public AccountService(string dataSourceID) 
    { 
     this._accountRepository = StorageHelper.GetTable<Account>(dataSourceID); 
     this._productRepository = StorageHelper.GetTable<Product>(dataSourceID); 
    } 

有一些办法，我可以简化构造所以每个不必做StorageHelper电话？

我也需要指定这个。 ？

Answer 1

public AccountService(ModelStateDictionary modelStateDictionary, string dataSourceID) 
    : this(dataSourceID) 
{ 
    this._modelState = modelStateDictionary; 

} 

这将首先调用你的其他构造函数。您也可以使用base(...来调用基础构造函数。

this在这种情况下是隐含的。

Answer 2

是的，你有两个选择：

1）摘要常见的初始化逻辑成另一种方法，并呼吁从每个构造。如果你需要控制哪些项目被初始化（即，如果_modelState需要_accountRepository后进行初始化）的顺序，你就需要这个方法：

public AccountService(ModelStateDictionary modelStateDictionary, string dataSourceID) 
{ 
    this._modelState = modelStateDictionary; 
    Initialize(dataSourceID); 
} 

public AccountService(string dataSourceID) 
{ 
    Initialize(dataSourceID); 
} 

private void Initialize(string dataSourceID) 
{ 
    this._accountRepository = StorageHelper.GetTable<Account>(dataSourceID); 
    this._productRepository = StorageHelper.GetTable<Product>(dataSourceID); 
} 

2）级联构造函数通过在结尾处增加this：

public AccountService(ModelStateDictionary modelStateDictionary, string dataSourceID) : this(dataSourceID) 
{ 
    this._modelState = modelStateDictionary; 
} 

public AccountService(string dataSourceID) 
{ 
    this._accountRepository = StorageHelper.GetTable<Account>(dataSourceID); 
    this._productRepository = StorageHelper.GetTable<Product>(dataSourceID); 
}