如何从同一对象的构造函数中调用不同的构造函数？

Question

我有一个具有重载构造函数的类。我想重构代码，以便对构造函数的一种形式的调用将参数转换为另一个构造函数接受的格式，然后调用它。

这是我目前拥有的三个构造函数的代码：

/// <summary>
/// Original Constructor accepting a single dataset
/// </summary>
/// <param name="theData"> The dataset containing the tables to be displayed</param>    
public DataForm(System.Data.DataSet theData)
{
    InitializeComponent();

    // Ensure a DataSets has been passed for display
    if (theData != null)
    {
        // Create a new list and add the single dataset to it
        List<DataSet> tempDataList = new List<DataSet>();
        tempDataList.Add(theData);

        // Assign the list of datasets to the member variable
        this.m_DSList = tempDataList;
    }

    CreateTabPages();
}

/// <summary>
/// Construct the form with tab pages assigned for each dataset
/// </summary>
/// <param name="DataArray">A collection of datasets, each to be displayed on their own tab page</param>
public DataForm(DataSet[] DataArray)
{
    InitializeComponent();

    // Ensure some DataSets have been passed for display
    if (DataArray != null && DataArray.Length > 0)
    {
        // Assign the list of datasets to teh member variable
        this.m_DSList = new List<DataSet>(DataArray);
    }

    CreateTabPages();
}

/// <summary>
/// Construct the form with tab pages assigned for each dataset
/// </summary>
/// <param name="DataList">A collection of datasets, each displayed on their own tab page</param>
public DataForm( List<System.Data.DataSet> DataList )
{
    InitializeComponent();

    // Assign the list of datasets to teh member variable
    this.m_DSList = DataList;

    CreateTabPages();
}

如您所见，前两个构造函数中有重复代码，因此需要重构。

我知道我可以有一个方法来初始化对象并从每个构造函数中调用它，但这似乎不是很优雅。

谁能指出我正确的方向？ 谢谢。

Answer 1

  public DataForm()
        {
             InitializeComponent(); 
        }
        public DataForm(DataSet theData): this()
        {
            this.m_DSList= (theData!=null) ? new List<DataSet>{theData}:null;
        }
        public DataForm(DataSet[] DataArray):this()
        {
             this.m_DSList= (DataArray!=null && DataArray.Length > 0) ? new List<DataSet>(DataArray):null;
        }
        public DataForm(List<DataSet> DataList ):this() 
        {           
            this.m_DSList = DataList; 
        }
        //Take this method out from constructor and for a better design but not mandatory
         public void CreateTabPages()
         {
         }

Answer 2

试试这个

public DataForm(System.Data.DataSet theData): this(new List<System.Data.DataSet>{theData}){}

public DataForm(DataSet[] DataArray): this(DataArray.ToList()){}

public DataForm( List<System.Data.DataSet> DataList )
{
    InitializeComponent();

    // Assign the list of datasets to teh member variable
    this.m_DSList = DataList;

    CreateTabPages();
}