截至目前,我正在尝试创建一个 ASP.NET 页面,该页面将根据您选择的类别按钮在列表框中列出类别中的书籍,然后我还有另外两个按钮(一个用于 DESC 顺序,一个用于 ASC 顺序) . 现在的问题是,当我在点击虚构按钮并填充列表框后单击 ASC 或 DESC 按钮时,它会擦除列表框并将我返回到 pageload 事件。
我尝试将填充项目移动到页面加载事件,当我一切正常时,但由于某种原因,当通过其他按钮点击它时它就不起作用了。
我对 ASP.NET 很陌生,所以非常欢迎简单或“对新手友好”的解释和代码示例/修复!
提前致谢!
下面的代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class partin : System.Web.UI.Page
{
private List<String> books = new List<String>();
public void Page_PreRender()
{
Item_Listbox.DataSource = books;
Item_Listbox.DataBind();
}
int SortASC(string x, string y)
{
return String.Compare(x, y);
}
int SortDESC(string x, string y)
{
return String.Compare(x, y) * -1;
}
protected void Page_Load(object sender, EventArgs e)
{
Header_Label.Text = "Welcome! Please select a book category.";
}
protected void Fiction_Click(object sender, EventArgs e)
{
Header_Label.Text = "Fiction Section";
books.Add("Title: The Old Man and The Sea | Decription: An epic novel. | Price: 10 USD | Quantity: 3");
books.Add("Title: A Game of Thrones | Decription: A tale of fire and ice. | Price: 15 USD | Quantity: 6");
books.Add("Title: Dracula | Decription: A book about vampires. | Price: 5 USD | Quantity: 7");
books.Add("Title: Twilight | Decription: An awful book. | Price: Free | Quantity: 1000");
}
protected void Non_Fiction_Click(object sender, EventArgs e)
{
Header_Label.Text = "Non-Fiction Section";
}
protected void Self_Help_Click(object sender, EventArgs e)
{
Header_Label.Text = "Self Help Section";
}
protected void Sort_Command(object sender, CommandEventArgs e)
{
if (e.CommandName == "Sort")
{
switch (e.CommandArgument.ToString())
{
case "ASC":
books.Sort(SortASC);
break;
case "DESC":
books.Sort(SortDESC);
break;
}
}
}
}
编辑:感谢您的帖子,它不再直接返回页面加载事件并保留标签中的更改以显示“小说”,但当我单击 ASD 或 DESC 按钮时,它仍在重置 ListBox 中的数据。