在C#中动态创建绑定到对象列表的ASP.NET中继器

我有一个非常简单的对象：

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; }
    }
}

我有一个DocumentType对象的列表：List< DocumentType> documentTypes = getDocuments();

我正在一个自定义控件上尝试在其中动态创建一个转发器并将其动态绑定到我的对象列表.这是我的代码：

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);
}

标题和分隔符效果很好.我不知道如何将项目模板绑定到当前项目以使其显示.我知道我现在所拥有的已经完全崩溃了,但是我已经尝试了好几种变体而没有运气.

在此先感谢您的帮助或在正确方向上的指示！

解决方法:

您遇到的问题是您假设RepeaterItem包含数据.它不是.它包含有关如何显示单个项目的信息.您需要使用该索引来返回数据源.我不确定是否有更好的方法,但是下面是如何使它工作的…

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();

标签：repeater,asp-net,c
来源： https://codeday.me/bug/20191208/2091841.html