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Question

Repeater in Repeater是我的問題的答案。

但是，我很困惑childRepeater.DataSource = ...;因爲我需要使用一種方法來獲取數據，並且該方法使用參數parent ID。我不明白我是如何得到parent ID的值 - 外部中繼器的ID。

我看了一些其他的例子，但無人接聽的作品......

Answer 1

使用參考答案會是這樣的，只是檢查當然是空值。

protected void ItemBound(object sender, RepeaterItemEventArgs args) 
    { 
     if (args.Item.ItemType == ListItemType.Item || args.Item.ItemType == ListItemType.AlternatingItem) 
     { 
      Repeater childRepeater = (Repeater)args.Item.FindControl("ChildRepeater"); 
      Repeater parentRepeater = (Repeater)args.Item.FindControl("ParentRepeater");  
      childRepeater.DataSource = YourMethod(parentRepeater.ID); 
      childRepeater.DataBind(); 
     } 
    } 

Answer 2

<asp:Repeater ID="ParentRepeater" runat="server"  
    OnItemDataBound="ParentRepeater_ItemDataBound"> 
    <ItemTemplate> 
     <strong>Parent</strong> 
     <asp:Label runat="server" ID="FirstNameLabel" 
     Text='<%# Eval("FirstName") %>' /> 
     <asp:Label runat="server" ID="LastNameLabel" 
     Text='<%# Eval("LastName") %>' /> 
     <br/> 
     <!-- Repeated data --> 
     <asp:Repeater ID="ChildRepeater" runat="server"> 
      <ItemTemplate> 
       <!-- Nested repeated data --> 
       <strong>Children</strong> 
       <asp:Label runat="server" ID="FirstNameLabel" 
       Text='<%# Eval("FirstName") %>' /> 
       <asp:Label runat="server" ID="LastNameLabel" 
       Text='<%# Eval("LastName") %>' /><br/> 
      </ItemTemplate> 
     </asp:Repeater> 
     <hr/> 
    </ItemTemplate> 
</asp:Repeater> 

public class User 
{ 
    public int UserId { get; set; } 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 

    public List<User> Children; 

    public User() 
    { 
     Children = new List<User>(); 
    } 
} 

protected void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
     var users = new List<User> 
     { 
      new User 
      { 
       UserId = 1, 
       FirstName = "Jon", 
       LastName = "Doe", 
       Children = new List<User> {new User { 
        UserId = 3, FirstName = "Marry", LastName = "Doe"}} 
      }, 
      new User 
      { 
       UserId = 2, 
       FirstName = "Eric", 
       LastName = "Newton", 
       Children = new List<User> {new User { 
        UserId = 3, FirstName = "Nick", LastName = "Newton"}} 
      } 
     }; 

     ParentRepeater.DataSource = users; 
     ParentRepeater.DataBind(); 
    } 
} 

protected void ParentRepeater_ItemDataBound(object sender, 
    RepeaterItemEventArgs args) 
{ 
    if (args.Item.ItemType == ListItemType.Item || 
     args.Item.ItemType == ListItemType.AlternatingItem) 
    { 
     var user = args.Item.DataItem as User; 
     var childRepeater = (Repeater) args.Item.FindControl("ChildRepeater"); 

     // You can get parent id like this - 
     // int parentUserId = user.UserId; 

     childRepeater.DataSource = user.Children; 
     childRepeater.DataBind(); 
    } 
}