Qt:按属性在列表中查找对象 [英] Qt : Find object in list by property

问题描述

我是Qt的初学者，我更习惯于C#编程.所以我的问题是如何在Qt中实现以下C#代码:

i'm a beginner in Qt, I'm more used to programming in C#. So my question is how to implement in Qt the C# code bellow:

public class MyObject 
{    
    private string myproperty;

    public string Myproperty 
    {
                get { return myproperty; }
                set { myproperty = value; }
    }    
}

private void button1_Click(object sender, EventArgs e) 
{
    List<MyObject> myobjectlist = new List<MyObject>();

    MyObject selectedobject = myobjectlist.Find(p => p.Myproperty == "Some name");               
}

在Qt中是否可以像上面的代码那样从列表中检索对象?

is it possible in Qt retrieve a object from list like the code above?

推荐答案

这与Qt本身无关.如果可以使用C ++ 11，请使用lambda，就像在C#中一样:

This has little to do with Qt itself. If you can use C++11, use a lambda, just like in C#:

auto itObj = std::find_if(
  myobjectlist.begin(), myobjectlist.end(),
  [](MyObject o) { return o.myproperty() == "Some name"; }
);
if (itObj != myobjectlist.end())
{
  // object was found, use *itObj (or itObj->) to access it/its members
}
else
{
  // object was not found
}

在没有C ++ 11的情况下，您必须使用operator()手工创建一个类用作谓词，或者手动编写一个for循环.

Without C++11, you'd have to hand-create a class with operator() to use as the predicate, or write a for loop by hand.

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