C＃构造设计 [英] C# Constructor Design

问题描述

我有你的文件夹中传递类，然后将其熄灭并处理了很多指定的文件夹中的数据

例如：

  MyClass的MyClass的=新MyClass的（@C：\temp）; 
  

现在它做什么它熄灭并读取说，一对夫妇一千文件，并用数据填充类。

我应该从构造出移动这个数据，并把它作为一个单独的方法，如：

  MyClass的MyClass的=新MyClass的（）; 
 myClass.LoadFromDirectory（@C：\temp）; 
  

解决方案

也许你应该尝试一下用静态方法这种方法。返回的对象的实例

  VAR MyClass的= MyClass.LoadFromDirectory（@C：\temp）; 
  

这将保持初始化代码的构造之外，还有给你说，一线声明你正在寻找。

---

去的评论从下面的海报，通过增加国家的实现可以像这样：

 公共类MyClass的
 {
 
 ＃区域构造
 
公共MyClass的（字符串目录）
 {
 this.Directory =目录; 
} 
 
 #endregion 
 
＃区域属性
 
公共MyClassState国家{获取;私人集;} 
 
私人字符串_directory; 
 
公共字符串目录
 {
 {返回_directory;} 
私定
 {
 _directory =价值; 
如果（string.IsNullOrEmpty（值））
 this.State = MyClassState.Unknown; 
，否则
 this.State = MyClassState.Initialized; 
} 
} 
 
 #endregion 
 
 
 
公共无效LoadFromDirectory（）
 {
如果（！this.State = MyClassState.Initialized || this.State = MyClassState.Loaded）
抛出新InvalidStateException（）; 
 
 //在载入
 
 this.State = MyClassState.Loaded; 
} 
 
} 
 
公共类InvalidStateException：异常{} 
 
 
公共枚举MyClassState 
 {
未知，
初始化，
加载
} 
  

I have a class which you pass in a folder and then it goes off and processes a lot of data within the specified folder.

For instance:

MyClass myClass = new MyClass(@"C:\temp");

Now what it does it goes off and reads say a couple thousand files and populates the class with data.

Should I move this data out from the constructor and have it as a seperate method, such as:

MyClass myClass = new MyClass();
myClass.LoadFromDirectory(@"C:\temp");

解决方案

Maybe you should try it this way with a static method that returns an instance of the object.

var myClass = MyClass.LoadFromDirectory(@"C:\temp");

This will keep the initialization code outside of your constructor, as well as giving you that "one line" declaration you are looking for.

---

Going on the comment from below from the poster, by adding State an implementation could be like so:

public class MyClass
{

#region Constructors 

    public MyClass(string directory)
    {
    	this.Directory = directory;
    }

#endregion

#region Properties

    public MyClassState State {get;private set;}

    private string _directory;

    public string Directory 
    {
    	get { return _directory;} 
    	private set 
    	{
    		_directory = value; 
    		if (string.IsNullOrEmpty(value)) 
    			this.State = MyClassState.Unknown; 
    		else 
    			this.State = MyClassState.Initialized;
    	}
    }

#endregion



    public void LoadFromDirectory()
    {
    	if (this.State != MyClassState.Initialized || this.State != MyClassState.Loaded)
    		throw new InvalidStateException();

    	// Do loading

    	this.State = MyClassState.Loaded;
    }

}

public class InvalidStateException : Exception {}


public enum MyClassState
{
    Unknown,
    Initialized,
    Loaded
}

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