C＃排序列表框中的元素 [英] C# sorting elements on a listbox
问题描述
我有一个20个元素的数组，我想将它们添加到列表框中是一个特定的顺序。我有一个用于在数组上添加元素的计数器，所以我希望列表框显示最后添加的元素，然后是前面的元素。
例如，如果我的最后一个元素是在计数器时添加的是4我希望元素按此顺序显示在列表框中
{4,3,2,1,0,19,18,17,16 ，15,14,13,12,11,10,9,8,7,6,5}
什么我试过了：
string [] ListaServizi1 = new string [] {item，item2，item3，item4，item5，item6，item7，item8， item9，item10，item11，item12，item13，item14，item15，item16，item17，item18，item19，item20};
if （historylistBox1.Items.Count == 20 ）
{
historylistBox1.Items.Clear（）;
}
int startfrom = tcounter;
int startover = 0 ;
int index = 0 ;
for （ int i = 0 ; i < = 20 ; i ++）
{
if （startfrom< listaservizi1.length mode = hold /> {
index ++;
historylistBox1.Items.Add（index + 。 + ListaServizi1 [startfrom]）;
startfrom ++;
}
else if （s tartfrom > = ListaServizi1.Length）
{
index ++;
historylistBox1.Items.Add（index + 。 + ListaServizi1 [startover]）;
startover ++;
startfrom ++;
}
2月3日，我在这里发布了一个通用解决方案堆栈你可以很容易地适应...而不需要修改...你的任务：[ ^ ]。
使用该示例中的代码，您的堆栈可能声明如下：//在表单范围内
//定义你的字符串数组...
private const int StringStackDepth = 20;
private StackT< string> stringStack = new StackT< string>（StringStackDepth）;
private BindingSource bindSource = new BindingSource（）;
//在Method或EventHanlder
private void Form1_Load（object sender，EventArgs e）
{
foreach（ListaServizi1中的字符串s）
{
StringStack.Push（s）;
}
bindSource = new BindingSource（）;
bindSource.DataSource = StringStack;
listBox1.DataSource = bindSource;
}现在，这里的难点是在修改堆栈时让ListBox更新。以下是您必须执行的操作的示例：
StringStack.Push（ item 21 ）;
bindSource = new BindingSource（）;
bindSource.DataSource = StringStack;
listBox1.DataSource = bindSource;我建议你考虑可能的成本（计算？内存使用？）进行堆栈的许多频繁更新...请注意，我从未尝试过从技术上来说，这真的很有价值。
如果我以这种方式使用这个通用堆栈，我可能会修改其代码以在数据发生变化时引发事件;然后用户将订阅该事件，并在该EventHandler中执行UI更新。这很容易做到。
当然，我也可能将堆栈值与字典或其他数据结构中的其他对象/实体相关联，然后设置ListBox的ValueMember。
如果你使用ListView，绑定要困难得多，但你可以在CodeProject上找到有关如何操作的资源，如此处所示：[ ^ ]，或者这里：[ ^ ]。
我假设这是一个Windows窗体项目，你使用的是ListBox或ListView控件：如果这不正确请修改你的帖子。
您是否研究过如何进行绑定，并使用'DataSource'，ValueMember和'DisplayMember工具？
这不是一个真正的排序问题，您希望项目反向顺序和旋转。
首先是陷阱：
for （ int i = 0 ;我< = 20 ; i ++）
错误，因为它循环21次。使用
i< 20
ListaServizi1 [i]按顺序阅读物品。
ListaServizi1 [19-i]按相反顺序读取物品。
ListaServizi1 [（5 + 19-i）％20]以旋转的相反顺序读取项目。
您的代码简化应该看起来例如：
for （ int i = 0 ; i < 20 ; i ++）
{
historylistBox1.Items.Add（（i + 1）+ 。 + ListaServizi1 [（5 + 19-i）的20％]）;
}
之前有人询问过，但幸运的是这不是stackoverflow
C＃ - 对列表框中的项目进行排序......！ [ ^
I have a 20 elements array and I want to add them to a listbox is a specific order. I have a counter for adding elements on the array so I want the list box to show the last element added on top and then the one before it.
For Example if my last element was added when the counter was 4 I want the element to be shown on the list box in this order
{4,3,2,1,0,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5}
What I have tried:
string [] ListaServizi1 = new string[] { item, item2, item3, item4, item5, item6, item7, item8, item9, item10, item11, item12, item13, item14, item15, item16, item17, item18, item19, item20 };
if (historylistBox1.Items.Count == 20)
{
historylistBox1.Items.Clear();
}
int startfrom = tcounter;
int startover = 0;
int index = 0;
for (int i=0; i <= 20; i++)
{
if (startfrom<listaservizi1.length mode="hold" /> {
index++;
historylistBox1.Items.Add(index + "."+ListaServizi1[startfrom]);
startfrom++;
}
else if(startfrom >= ListaServizi1.Length)
{
index++;
historylistBox1.Items.Add(index + "." + ListaServizi1[startover]);
startover++;
startfrom++;
}On February 3, I posted a solution here for a "generic stack" that you could easily adapt ... without modification ... to your task: [^].
Using the code in that example, your stack might be declared like this:// in Form Scope // define your Array of Strings ... private const int StringStackDepth = 20; private StackT<string> stringStack = new StackT<string>(StringStackDepth); private BindingSource bindSource = new BindingSource(); // in a Method or EventHanlder private void Form1_Load(object sender, EventArgs e) { foreach (string s in ListaServizi1) { StringStack.Push(s); } bindSource = new BindingSource(); bindSource.DataSource = StringStack; listBox1.DataSource = bindSource; }Now the "hard part" here is getting the ListBox to update when you have modified the Stack. Here's an example of what you have to do:
StringStack.Push("item 21"); bindSource = new BindingSource(); bindSource.DataSource = StringStack; listBox1.DataSource = bindSource;I suggest you consider the possible "cost" (computation ? memory use ?) making many frequent updates of the Stack ... note that I have never tried to really evaluate this technically.
If I were using this generic Stack in this way, I'd probably modify its code to raise an Event when the data changed; then the user would subscribe to that event, and perform the UI update in that EventHandler. This would be easy to do.
Of course, I might also be associating stack values with some other object/entity in a Dictionary, or other data structure, and then setting the 'ValueMember of the ListBox.
If you are using a ListView, binding is much more difficult, but you can find resources on how to do it, like here, on CodeProject: [^], or here: [^].
I assume this is a Windows Forms Project, and you are using a ListBox, or ListView Control: if that's not correct please revise your post.
Have you studied how to do binding, and use 'DataSource, 'ValueMember, and 'DisplayMember tools ?
This is not really a sort problem, you want the items in reverse order and with a rotation.
First of all the pitfall:
for (int i=0; i <= 20; i++)is wrong because it loop 21 times. Use
i<20
ListaServizi1[i]read items in order.
ListaServizi1[19-i]read items in reverse order.
ListaServizi1[(5+19-i)%20]read items in reverse order with rotation.
Your code simplified should look like:
for (int i=0; i < 20; i++) { historylistBox1.Items.Add((i+1) + "."+ListaServizi1[(5+19-i)%20]); }
This is asked before but lucky this is not stackoverflow
C# - Sorting items in a listbox...![^]
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