使用C＃接口 [英] Using C# Interfaces

问题描述

我正在阅读有关WinForms第三方控件的一些文档。我正在看的是一个搜索控件，基本上它只是一个文本框，你可以输入一些数据，它将搜索另一个控件，前提是控件正在实现接口的
。所以，假设我有一个网格控件，甚至是一个实现 的listView控件。从 界面然后我现在可以搜索他们的数据。  

I was reading some documentation on third-party controls on WinForms. The one I was looking at was a search control, basically it is just a textbox where you can type in some data and it will search against another control provided that the control is implementing the interface. So, let's say I have a grid control or even a listView control that implements  from  interface then I can now search their data.  

{ 
	List<string> Data { get;}
}


public class FirstData : IData
{
	public List<string> Data
	{
		get
		{
				List<string> data=new List<string>();
				data.Add("a");
				data.Add("b");
				data.Add("c");
				return data;
		}	
	}
}


public class SecondData : IData
{
	public List<string> Data
	{
		get
		{
			List<string> data = new List<string>();
			data.Add("d");
			data.Add("e");
			data.Add("f");
			return data;
		}
	}
}

//获取数据

public List< string> GetData（IData数据）
{
return data.Data;
}

public List<string> GetData(IData data)
{
return data.Data;
}

虽然，这不使用真正的控件，但我想你明白了。编码会工作正常，但我正在寻找一个更好的方法如何做到这一点。其他开发人员可能会检查一个类是否实现了所述接口，但我真的不知道那个
以及它与我上面的代码有什么不同。 

Though, this doesn't use a real control but i guess you get the idea.Code will work fine though but i am looking for a better way how to do this right. Other developers might check if a class implements the said interface but i really don't know that yet and how does it differ from my code above. 

我也做还有一个问题是使用接口，因为我只知道当接口有一个属性或方法时如何使用接口。 
$


假设我有一个像这样的示例代码

I also do have another concern using interfaces because i only know how to use interface when that interface does have a properties or methods. 

Let's say i have a sample code like this

public interface ISetting
{

}

public class ApplicationSetting:ISetting
{
    string Setting1 {get;set;}
    string Setting2 {get;set;}
}


public class AnotherSetting : ISetting
{ 
    string AnotherSetting1{get;set;}
    string AnotherSetting2{get;set;}
}

我是否使用它，我只知道该类实现了接口，但我真的不知道实现该接口的类的属性是什么。

How do i use this, i only know that the class implements the interface but i really don't have an idea what are the properties of the class that implements the interface.

问候

推荐答案

Hi Dikong42，

Hi Dikong42,

问题的第一部分：

"虽然  这不使用真正的控制，但是  猜你得到了想法 。
c ode  可以正常工作，但我 正在寻找更好的方法如何做到这一点。"

接口已经实现，因为它应该是唯一应该改变的是您的属性getter： 

the interface is already implemented as it should the only thing that you should change is your properties getters : 

public class FirstData: IData
{
        // always initialize backing fields in the constructor
        // 
        public FirstData()
        {
                data = new List<string>();
		data.Add("a");
		data.Add("b");
		data.Add("c");
        }
        // consider using a backing field if you need to 
        // implement a kind of validation or any interaction while setting values 
        // otherwise auto-properties will generate the same IL with a backing field
	List<string> data;
	public List<string> Data
	{
		get
		{
			return data;
		}	
	}
}

第二部分关于没有成员的接口，这些用于"让我们说"类的标志，它使我们能够通过反射搜索它们：

for the second part about interfaces without members, those are used to "let say a flag for the class", which enables us to search them through reflection:

var type = typeof(IEntity);
var types = AppDomain.CurrentDomain.GetAssemblies()
    .SelectMany(s => s.GetTypes())
    .Where(p => type.IsAssignableFrom(p));

这是一篇解释情况的文章：  让C＃类实现接口，

here is an article explaining the situation: get C# classes implementing interface,

最好的问候，

Mouad。

良好的编码;

这篇关于使用C＃接口的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！