绑定数组 +下拉列表中的一个对象

发布于 2024-09-27 12:17:55 字数 398 浏览 2 评论 0原文

我有一个 Person 类型的数组，其中包含字符串对象：FirstName、LastName、login。

我将其绑定到下拉列表。

现在，除了这个数组之外，我还想显示另一个名为“Desk”的项目。我怎样才能做到这一点？

我当前的代码是：

Person[] traders = GetTraders();
ddl_trader.Items.Clear();
ddl_trader.DataSource = traders;
ddl_trader.DataTextField = "LastName";
ddl_trader.DataValueField = "Login";
ddl_trader.DataBind();

我还希望我添加的一项额外项目成为默认选定项目。

原文

I have an array of type Person, which contains string objects: FirstName, LastName, login.

I have this bound to a dropdownlist.

Now along with this array, I also want to display one more item called "Desk". How can i do that?

My current code is:

Person[] traders = GetTraders();
ddl_trader.Items.Clear();
ddl_trader.DataSource = traders;
ddl_trader.DataTextField = "LastName";
ddl_trader.DataValueField = "Login";
ddl_trader.DataBind();

I also want that one extra item I'm adding to be the default selected item.

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夜巴黎 2024-10-04 12:17:55

您可以将 AppendDataBoundItems 属性设置为 true（默认情况下为 false），手动添加项目，然后执行数据绑定过程以添加剩余的项目项目。 AppendDataBoundItems 确定在数据绑定期间是否清除列表。

ddl_trader.Items.Clear();
ddl_trader.AppendDataBoundItems = true;
ddl_trader.Items.Add("Desk");
ddl_trader.DataTextField = "LastName";
ddl_trader.DataValueField = "Login";
ddl_trader.DataSource = traders;
ddl_trader.DataBind();

如果您需要在绑定列表后添加新项目，则可以执行

ddl_trader.Items.Insert(0, "Desk");

此操作，不需要将 AppendDataBoundItems 设置为 true。

You can set the AppendDataBoundItems property to true (it's false by default), add your item manually, then do the databinding process to add the remaining items. AppendDataBoundItems determines if the list is cleared during databinding or not.

ddl_trader.Items.Clear();
ddl_trader.AppendDataBoundItems = true;
ddl_trader.Items.Add("Desk");
ddl_trader.DataTextField = "LastName";
ddl_trader.DataValueField = "Login";
ddl_trader.DataSource = traders;
ddl_trader.DataBind();

if you need to add the new item after the list has been bound, you can do

ddl_trader.Items.Insert(0, "Desk");

this does not require setting AppendDataBoundItems to true.

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只想待在家 2024-10-04 12:17:55

其中一种方法是将 GetTraders() 的结果加载到 List 中。然后，您可以将一个或多个新的 Person 对象添加到列表中，然后再将其绑定到下拉列表。

List<Person> traders = new List<Person>(GetTraders());
traders.Add(new Person() { LastName = "Foo", Login = "Bar" });
ddl_trader.DataSource = traders;

您还可以定义一个附加数组并将其连接到结果，而不是创建组合集合。（注意：这将是两个不同的数组，被视为单个序列，但支持数组仍然是独立的）。

Person[] traders = GetTraders();
Person[] moreTraders = new Person[] { new Person() { LastName = "Foo", Login = "Bar" } };
ddl_trader.DataSource = traders.Concat(moreTraders);

One such method is to load the result of GetTraders() into a List<Person>. You can then add one or many new Person objects to the list before binding it to your dropdown.

List<Person> traders = new List<Person>(GetTraders());
traders.Add(new Person() { LastName = "Foo", Login = "Bar" });
ddl_trader.DataSource = traders;

You could also define an additional array and concatenate that to the result instead of creating a combined collection. (Note: this would be two distinct arrays treated as a single sequence, however the backing arrays would still be seperate).

Person[] traders = GetTraders();
Person[] moreTraders = new Person[] { new Person() { LastName = "Foo", Login = "Bar" } };
ddl_trader.DataSource = traders.Concat(moreTraders);

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