如何使用 C# 中的字符串从具有数据源集的列表框中删除项目

发布于 2024-12-06 12:18:18 字数 254 浏览 0 评论 0原文

我该如何使用字符串删除项目？？？（我不想通过使用选定的索引来删除它）
我想要类似的东西

USStates.Remove("Alabama","AL");

原文

refferring to msdn link

how can I remove an item using string???
(I don't want to remove it by using selected index)
I want something like

USStates.Remove("Alabama","AL");

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原来分手还会想你 2024-12-13 12:18:18

您无法更改 Items 集合，但可以更改数据源（List 或 ArrayList）。

首先，重写 USState 类型中的 GetHashCode() 和 Equals() 方法。

public override int GetHashCode()
{
     return myLongName.GetHashCode() + myShortName.GetHashCode();
} 
public override bool Equals(object obj)
{
     return GetHashCode() == obj.GetHashCode();
}

现在，您可以删除一个元素，

 listBox1.DataSource = null; // Set null so you can update DataSource
 USStates.Remove(new USState("Wisconsin", "WI"));
 listBox1.DataSource = USStates;
 listBox1.DisplayMember = "LongName";
 listBox1.ValueMember = "ShortName";

You can't change Items collection but you can change the DataSource (List or ArrayList).

First of all override GetHashCode() and Equals() methods in USState type.

public override int GetHashCode()
{
     return myLongName.GetHashCode() + myShortName.GetHashCode();
} 
public override bool Equals(object obj)
{
     return GetHashCode() == obj.GetHashCode();
}

Now, you can remove an element,

 listBox1.DataSource = null; // Set null so you can update DataSource
 USStates.Remove(new USState("Wisconsin", "WI"));
 listBox1.DataSource = USStates;
 listBox1.DisplayMember = "LongName";
 listBox1.ValueMember = "ShortName";

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想挽留 2024-12-13 12:18:18

更新：我假设您添加了一个可以单击以删除项目的按钮。

    BindingList<USState> USStates;
    public Form1()
    {
        InitializeComponent();

        USStates = new BindingList<USState>();
        USStates.Add(new USState("Alabama", "AL"));
        USStates.Add(new USState("Washington", "WA"));
        USStates.Add(new USState("West Virginia", "WV"));
        USStates.Add(new USState("Wisconsin", "WI"));
        USStates.Add(new USState("Wyoming", "WY"));

        listBox1.DataSource = USStates;
        listBox1.DisplayMember = "LongName";
        listBox1.ValueMember = "ShortName";
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var removeStates = (from state in USStates
                            where state.ShortName == "AL"
                            select state).ToList();
        removeStates.ForEach( state => USStates.Remove(state) );
    }

PS：我以为你在我之前的回答中使用的是WPF。

Updated: I assume you add a button that you can click to remove an item.

    BindingList<USState> USStates;
    public Form1()
    {
        InitializeComponent();

        USStates = new BindingList<USState>();
        USStates.Add(new USState("Alabama", "AL"));
        USStates.Add(new USState("Washington", "WA"));
        USStates.Add(new USState("West Virginia", "WV"));
        USStates.Add(new USState("Wisconsin", "WI"));
        USStates.Add(new USState("Wyoming", "WY"));

        listBox1.DataSource = USStates;
        listBox1.DisplayMember = "LongName";
        listBox1.ValueMember = "ShortName";
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var removeStates = (from state in USStates
                            where state.ShortName == "AL"
                            select state).ToList();
        removeStates.ForEach( state => USStates.Remove(state) );
    }

PS: I thought you're using WPF in my previous answer.

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