綁定到一個對象列表

Question

我有一個非常簡單的對象C＃創建ASP.NET直放站動態：

public class DocumentType 
{ 
    private int id; 
    private string name; 

    public int ID 
    { 
     get { return this.id; } 
     set { this.id = value; } 
    } 

    public string Name 
    { 
     get { return this.name; } 
     set { this.name = value; } 
    } 
} 

我有DocumentType對象的列表：List<DocumentType> documentTypes = getDocuments();

我m工作在一個自定義控件，我試圖動態創建一箇中繼器，並動態綁定到我的對象列表。這是我的代碼：

private Repeater docList; 
docList = new Repeater(); 
docList.DataSource = documentTypes; 
docList.DataBind(); 

foreach (RepeaterItem repeatItem in docList.Items) 
{ 
    // if condition to add HeaderTemplate Dynamically only Once 
    if (repeatItem.ItemIndex == 0) 
    { 
     RepeaterItem headerItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Header); 
     HtmlGenericControl hTag = new HtmlGenericControl("h4"); 
     hTag.InnerHtml = "Header"; 
     repeatItem.Controls.Add(hTag); 
    } 

    // Add ItemTemplate DataItems Dynamically 

    RepeaterItem repeaterItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Item); 
    Label lbl = new Label(); 

    // This part is completely broken! 
    lbl.Text = string.Format("Content: {0} {1} <br />", (DocumentType)repeaterItem.DataItem).ID, repeaterItem.NamingContainer); 
    repeatItem.Controls.Add(lbl); 

    // Add SeparatorTemplate Dynamically 
    repeaterItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Separator); 
    LiteralControl ltrlHR = new LiteralControl(); 
    ltrlHR.Text = "<hr />"; 
    repeatItem.Controls.Add(ltrlHR); 
} 

標題和分隔符很好。我無法弄清楚如何將項目模板綁定到當前項目以使其顯示。我知道我現在在那裏有什麼完全破碎，但我已經嘗試了幾個變化，沒有運氣。

預先感謝任何幫助或指引在正確的方向！

Answer 1

您遇到的問題是您假定RepeaterItem包含數據。它不是。它包含有關如何顯示單個項目的信息。您需要使用該索引重新獲取數據源。我不確定是否有更好的方法，但下面是我如何得到它的工作...

List<DocumentType> documentTypes = new List<DocumentType>(); 
documentTypes.Add(new DocumentType(){ ID=1, Name="Bob"}); 
documentTypes.Add(new DocumentType() { ID = 2, Name = "Tom" }); 
documentTypes.Add(new DocumentType() { ID = 3, Name = "Chick" }); 
Repeater docList = new Repeater(); 
docList.DataSource = documentTypes; 
docList.DataBind(); 

foreach (RepeaterItem repeatItem in docList.Items) 
{ 
    int index = repeatItem.ItemIndex; 
    DocumentType docType = ((IList<DocumentType>)docList.DataSource)[index]; 
    // if condition to add HeaderTemplate Dynamically only Once 
    if (index == 0) 
    { 
     HtmlGenericControl hTag = new HtmlGenericControl("h4"); 
     hTag.InnerHtml = "Header"; 
     repeatItem.Controls.Add(hTag); 
    } 

    // Add ItemTemplate DataItems Dynamically 

    RepeaterItem repeaterItem = new RepeaterItem(repeatItem.ItemIndex, ListItemType.Item); 
    Label lbl = new Label(); 

    // This part is completely broken! 
    lbl.Text = string.Format("Content: {0} {1} <br />", docType.ID, repeaterItem.NamingContainer); 
    repeatItem.Controls.Add(lbl); 

    // Add SeparatorTemplate Dynamically 
    LiteralControl ltrlHR = new LiteralControl(); 
    ltrlHR.Text = "<hr />"; 
    repeatItem.Controls.Add(ltrlHR); 
} 

StringBuilder sb = new StringBuilder(); 
docList.RenderControl(new HtmlTextWriter(new StringWriter(sb))); 
Text = sb.ToString();