从集合中获取对象 [英] getting objects from a collection

问题描述

我有一个名为Documents
的类 我有一个名为class StoreObjects:List< Documents>
的集合
我正在从Form1中向集合中输入数据

这是Form1中代码的一部分"

StoreObjects so = new StoreObjects();

d =新文档(txtName.Text，txtSurname.Text，txtTitle.Text);
so.Add(d);

到目前为止，我设法输入甚至显示了数据.

我现在想要的是来自Form2的文件，我希望能够按标题进行搜索，如果我从Form1进行搜索，这是可行的，但是Form2却不起作用

I have a class named Documents
I have a collection named class StoreObjects:List<Documents>

I am entering data into the collection from a Form1

"this is part of the code in Form1"

StoreObjects so = new StoreObjects();

d = new Documents(txtName.Text, txtSurname.Text, txtTitle.Text);
so.Add(d);

so far I managed to enter data and even display it.

What I want now is from Form2, I want to be able to search by title, if I do it from Form1 this works but from Form2 does not work

so.SearchByTitle(txtTitle.Text);
            Console.WriteLine(so.foundTitle);
            if (so.foundTitle == false)
            {
                Console.WriteLine("Not Found");
            }

这就是我在StoredObject中拥有的

this is what i have in StoredObject

public bool SearchByTitle(string aTitle)
        {
            foreach (Documents d in this)
            {
                if ((d != null) && (d.Title == aTitle))
                {
                    foundTitle = true;
                    Console.WriteLine(d.GetData());
                }
            }
            return foundTitle;
        }

我认为这是因为表格2中的声明
StoreObjects so = new StoreObjects();

我该如何设法获得想要的结果?

I think that it is because of this declaration in Form 2
StoreObjects so = new StoreObjects();

how can I manage to get the results I want

推荐答案

您可能应该制作一个静态全局类，该类包含要从程序的任何位置进行访问的数据.

-OR-

如果form2是由form1创建的，则只需在form2的构造函数中传递form1作为参数，就可以从form 2访问so(当然，只要它是公共的).

You should probably make a static globals class that contains data that you want to make accessible from any point in your program.

-OR -

If form2 is created by form1, you can simply pass form1 as a parameter in form2''s constructor, and you can accessso (as long as it''s public, of course) from form 2.

静态类的示例:

Example of a static class:

pubic static class Globals
{
    public static StoredObjects StoredObjects { get; set; }

    private Globals()
    {
        StoredObjects = new StoredObjects();
    }
}

您可以这样称呼:

You call it like so:

if (Globals.StoredObjects != null)
{
   ...
}

这是传递列表视图和组合框控件的示例；
在您的点击事件中；

this is an example to pass a listview and a combobox control;
on your click event;

{
   Form2 form2 = new Form2(lvTest1, cmbTest2);
   form2.ShowDialog(this);
}

在form2.cs下

under the form2.cs

public partial class Form2 : Form
    {
        ListView lv = new ListView();
        ComboBox cb = new ComboBox();
        public Form2(ListView lvParents, ComboBox cbParent)
        {
            InitializeComponent();
            lv = lvParents;
            cb = cbParent;
        }
     }

因此您可以根据给定的示例修改代码.

so you can modify your code, based on given example.

这篇关于从集合中获取对象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！