.net 向ItemControl添加元素的成本有多高？

我只是有一个一般的.NET查询：

假设我有一个大的（内存大小）类

如果我向ItemControl（如ListBox或Datagrid）添加一个项，如下所示

BigClass b = new BigClass();
ListBox1.Items.Add(b);

这样做的资源使用情况如何？添加的项是引用的还是实例的副本（导致大量内存使用）

---

谢谢。

它将作为参考添加。.NET对象没有隐式复制语义。

为了确保这一点，我刚刚做了一个快速而肮脏的测试，ListBox1。Items不复制，而是保留一个引用

以下是完整的代码：

public class A
{

    int a;

    public int A1
    {
        get { return a; }
        set { a = value; }
    }

}
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        A a = new A();
        a.A1 = 4;

        A b = new A();
        b.A1 = 4;

        listBox1.Items.Add(a);
        listBox1.Items.Add(b);

        A c = listBox1.Items[0] as A;
        A d = listBox1.Items[1] as A;

        if(a.Equals(c))
        {
            int k = 8; //program enter here so a is instance of c
        }

        if (a.Equals(d))
        {
            int k = 8; //program doesn't enter here meaning a is not instance of d
        }


    }
}

---

谢谢，这确实很有帮助。你是对的，但这并不意味着ListBox.Items的“add”方法中没有克隆

public class A
{

    int a;

    public int A1
    {
        get { return a; }
        set { a = value; }
    }

}
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        A a = new A();
        a.A1 = 4;

        A b = new A();
        b.A1 = 4;

        listBox1.Items.Add(a);
        listBox1.Items.Add(b);

        A c = listBox1.Items[0] as A;
        A d = listBox1.Items[1] as A;

        if(a.Equals(c))
        {
            int k = 8; //program enter here so a is instance of c
        }

        if (a.Equals(d))
        {
            int k = 8; //program doesn't enter here meaning a is not instance of d
        }


    }
}