Asp.Net Web控件（四）（可分页的Repeater）

这是一个自带分页的继承Repeater的控件，支持url分页，支持回发分页。

先上效果。

设计时html代码：

>

设计时效果：

运行出来的效果如下：

生成的html也非常简洁：

后台代码：

protected void Page_Load(object sender, EventArgs e)
{
    PageRepeater1.FromSection = DbSession.Default.From<Products>().OrderBy(Products._.ProductID.Asc);
    PageRepeater1.DataBind();
}

代码也很简单，不过这里是使用url分页，才是这种写法，如果使用回发分页就不是这样写啦。当然使用需要配合Hxj.Data组件。

如何具体使用在下一节将详细讲述。

这里还是继续讲述控件的编写。

[DefaultEvent("PageChanged")]
[ToolboxData("<{0}:PageRepeater runat=server></{0}:PageRepeater>")]
public class PageRepeater : Repeater, IPostBackEventHandler, IPostBackDataHandler

为了方便直接继承与Repeater。

控件之所以能主动分页并且只取相应的页码数据，这里就是使用了Hxj.Data的分页。

private FromSection _fromSection;

/// <summary>
///  如果是sql2000或者access数据库一定要设置排序字段
/// </summary>
[Category("Behavior"), Browsable(false)]
[Description("FromSection")]
public FromSection FromSection
{
    get
    {
        return _fromSection;
    }
    set
    {
        _fromSection = value;
    }
}

这里设置需要的FromSection。

然后重写了DataBind方法，如下：

/// <summary>
/// 重写DataBind
/// </summary>
public override void DataBind()
{

    if (null != _fromSection)
    {
        this.RecordCount = _fromSection.Count();

        this.DataSource = _fromSection.Page(PageSize, CurrentPageIndex).ToDataTable();
    }

    base.DataBind();
}

看这里的就知道了，并不是一定要设置FromSection，只需要设置RecordCount 和 DataSource 也是可以达到分页的效果。

下面的代码就是如何实现分页代码的输出：

if (!string.IsNullOrEmpty(pager.PageCssClass))
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, PageCssClass);
}
else
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, "pagedefault");
}
if (!string.IsNullOrEmpty(PageStyle))
{
    writer.AddAttribute(HtmlTextWriterAttribute.Style, PageStyle);
}
writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, PageAlign.ToString());
writer.AddAttribute(HtmlTextWriterAttribute.Id, UniqueID + "div");
writer.RenderBeginTag(HtmlTextWriterTag.Div);

writer.Write(string.Concat("第", CurrentPageIndex.ToString(), "/", PageCount.ToString(), "页，每页", PageSize.ToString(), "条，共", RecordCount.ToString(), "条  &nbsp;&nbsp;&nbsp;&nbsp;"));

if (CurrentPageIndex > 1)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(1));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
}
else
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");
    writer.RenderBeginTag(HtmlTextWriterTag.Span);
}
writer.Write("<<");
writer.RenderEndTag();


if (CurrentPageIndex > 1)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(CurrentPageIndex - 1));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
}
else
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");
    writer.RenderBeginTag(HtmlTextWriterTag.Span); 
}
writer.Write("<");
writer.RenderEndTag();

int totalIndex = PageCount / 10;
int tempIndex = (CurrentPageIndex - 1) / 10;
int startNumberIndex = tempIndex * 10 + 1;
int endNumberIndex = startNumberIndex + 10;

if (CurrentPageIndex > 10)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(startNumberIndex - 1));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
    writer.Write("...");
    writer.RenderEndTag();
}


for (int i = startNumberIndex; i < endNumberIndex; i++)
{
    if (i > PageCount)
        break;

    if (i == CurrentPageIndex)
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Class, "current");
        writer.RenderBeginTag(HtmlTextWriterTag.Span);
    }
    else
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(i));
        writer.RenderBeginTag(HtmlTextWriterTag.A);
    }

    writer.Write(i.ToString());
    writer.RenderEndTag();
}


if (PageCount > 10 && tempIndex < totalIndex)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(endNumberIndex));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
    writer.Write("...");
    writer.RenderEndTag();
}


if (CurrentPageIndex < PageCount)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(CurrentPageIndex + 1));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
}
else
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");
    writer.RenderBeginTag(HtmlTextWriterTag.Span);
}

writer.Write(">");
writer.RenderEndTag();


if (CurrentPageIndex < PageCount)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Href, getHrefstring(PageCount));
    writer.RenderBeginTag(HtmlTextWriterTag.A);
}
else
{
    writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");
    writer.RenderBeginTag(HtmlTextWriterTag.Span);
}

writer.Write(">>");
writer.RenderEndTag();


if (PageIndexBox == PageIndexBoxType.TextBox)
{
    writer.AddAttribute(HtmlTextWriterAttribute.Id, UniqueID + "_input");
    writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID + "_input");
    writer.AddAttribute("onkeydown", string.Concat("pr_keydown(event,'", UniqueID, "_btn');"));
    writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
    writer.AddStyleAttribute(HtmlTextWriterStyle.Width, "30px");
    writer.AddAttribute(HtmlTextWriterAttribute.Value, CurrentPageIndex.ToString());
    writer.RenderBeginTag(HtmlTextWriterTag.Input);
    writer.RenderEndTag();

    writer.AddAttribute(HtmlTextWriterAttribute.Id, UniqueID + "_btn");
    writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID + "_btn");
    writer.AddAttribute(HtmlTextWriterAttribute.Type, "button");
    writer.AddAttribute(HtmlTextWriterAttribute.Value, "Go");
    if (UrlPaging)
        writer.AddAttribute(HtmlTextWriterAttribute.Onclick, string.Concat("if(pr_checkInput('", UniqueID, "_input',", PageCount.ToString(), ")){pr_goToPage('", UniqueID, "_input');}"));
    else
        writer.AddAttribute(HtmlTextWriterAttribute.Onclick, string.Concat("if(pr_checkInput('", UniqueID, "_input',", PageCount.ToString(), ")){", Page.ClientScript.GetPostBackClientHyperlink(control, ""), ";}"));
    writer.RenderBeginTag(HtmlTextWriterTag.Input);
    writer.RenderEndTag();
}
else if (PageIndexBox == PageIndexBoxType.DropDownList)
{
    writer.Write(" 转到第");
    writer.AddAttribute(HtmlTextWriterAttribute.Id, UniqueID + "_input");
    writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID + "_input");
    if (UrlPaging)
        writer.AddAttribute("onchange", string.Concat("pr_goToPage('", UniqueID, "_input')"));
    else
        writer.AddAttribute("onchange", Page.ClientScript.GetPostBackClientHyperlink(control, ""));
    writer.RenderBeginTag(HtmlTextWriterTag.Select);
    for (int i = 1; i <= PageCount; i++)
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Value, i.ToString());
        if (i == CurrentPageIndex)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Selected, "true");
        }
        writer.RenderBeginTag(HtmlTextWriterTag.Option);
        writer.Write(i.ToString());
        writer.RenderEndTag();
    }
    writer.RenderEndTag();
    writer.Write("页");
}

writer.RenderEndTag();

好长的一段，看着都有一点晕，呵呵。

其他代码也就不贴啦，下一节将讲述如何使用该控件。

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