Question

我有一个asp:Listbox我需要根据用户选择切换项目。这是我尝试过的：

 string[] my2012Departments = new string[5];
            my2012Departments[0] = "Administration"; 
            my2012Departments[1] = "Imaging Services"; 
            my2012Departments[2] = "IT"; 
            my2012Departments[3] = "Lab"; 
            my2012Departments[4] = "Support Services";
            lstDSYDepartment.Items.AddRange(my2012Departments.ToArray()); 
           //The AddRange will also not work without .ToArray()

然而，这会导致以下错误：

1。无法转换为＆＃39; string []＆＃39;到＆＃39; System.Web.UI.WebControls.ListItem []＆＃39;

2.最佳重载方法匹配.... AddRange ....有一些无效的参数

根据the documentation，只要我将代码放在表单加载中，这应该可以工作。

Answer 1

您可以创建List<string>并将其指定为列表框的数据源，如下所示

List<string> my2012Departments = new List<string>();
my2012Departments.Add("Administration");
my2012Departments.Add("Imaging Services");
my2012Departments.Add("IT");
my2012Departments.Add("Lab");
my2012Departments.Add("Support Services");


lstDSYDepartment.DataSource = my2012Departments;
lstDSYDepartment.DataBind();

（OR）而不是分配字符串数组;创建一个ListItem[]数组，如下所示

ListItem[] my2012Departments = new ListItem[5];
    my2012Departments[0] = "Administration"; 
    my2012Departments[1] = "Imaging Services"; 
    my2012Departments[2] = "IT"; 
    my2012Departments[3] = "Lab"; 
    my2012Departments[4] = "Support Services";

  this.lstDSYDepartment.Items.AddRange(my2012Departments);

Answer 2

您引用的文档适用于Windows窗体，而不适用于ASP。

尝试

lstDSYDepartment.Items.Add("Administration");
lstDSYDepartment.Items.Add("Imaging Services");
...

如何填充＆＃39; asp：ListBox＆＃39;有一串字符串？

2 个答案: