Repeater Content Limits?
Aug 16, 2011
I have a requirement that the user wishes to be able to scroll through as many as 4000 records in a dataset on the screen. The average number is around 500 records in the dataset, and there are 12 columns of data in each record. I am using a repeater to do the binding of the data, no problem.
Around 500 the system performance is fine. The actual data binding is taking about 2 seconds and the screen painting is taking about 10 seconds depedning on the time of day (other internet usage within the company bogging down the pipeline).
However, when I try to do 2300 records, the performance is abysmal. The binding time is acceptable, but the screen painting is SO slow. Essentially a 11mb web page is generated.This seems like an awful lot of data to me for a web page.
1) Is this normal to have a web page served up that is that big? We're talking text, not photos.
2) Is there a limit on the number of records that a repeater can work with? Obviously I can throw as many records as I want, so I am looking at a practical limit vs an actual limit.
3) I notice when I throw a drop-down into the repeater, the time lag is even greater. Is this because of the need to render the drop down?
I have tried to convince the user that they should use paging instead, but they are insisting on using scrolling. I get why scrolling would be good, but I am concerned that the performance is hideous above a certain threshold and I don;t think I can make it render the page without throwing a significant network speed upgarde and dedicated line for the website.
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[Code]....
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[Code]....
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Edit: I have a working solution already - I would just like to know why my original attempt didn't work. My original attempt is the code below.
I'm using the approach I found here:[URL] 306154 to implement a nested Repeater. Each parent item has one or more children items (the point of having the nested Repeater) with a dropdown horizontally aligned to each child item. In an effort to re-use the nested part of the Repeater I wanted to develop that piece as a user control but couldn't get it to work. I am wondering if it is even possible and if so how?
Here is my user control apsx:
<asp:Repeater ID="NestedRepeater" runat="server">
....
<ItemTemplate>
<tr class="text" id="RepeaterItemRow" runat="server">
<td>
<%#DataBinder.Eval(Container.DataItem, "Name") %>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
</ItemTemplate>
And here is my code behind for the user control. I noticed when I debugged NestedDataSource was null even though in the parent page load the data is there:
public DataSet NestedDataSource
{
get;
set;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
NestedRepeater.DataSource = NestedDataSource;
NestedRepeater.DataBind();
}
}
In the parent Repeater in the `<ItemTemplate> I have:
<asp:RepUC ID="NestRep" runat="server" NestedDataSource='<%#((DataRowView)Container.DataItem).Row.GetChildRows("nestedrel") %>'>
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protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BuildWBS();
}
}
private void BuildPage()
{
DataSet ds = new DataSet();
ds = DataAccessLayer.GetData("System");
ds.Relations.Add("nestedrel", ds.Tables[0].Columns["Id"], ds.Tables[1].Columns["ParentId"]);
ParentRepeater.DataSource = ds;
ParentRepeater.DataBind();
}
The page loads but nothing relating to the repeater appears on the screen. So, can you see anything wrong with what I have? Is the way I tried doing this even possible?
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protected void btn1_Click(object sender, EventArgs e)
{
foreach (RepeaterItem item in rptWord.Items)
{
DropDownList ddl1 = (System.Web.UI.WebControls.DropDownList)rptWord.FindControl("ddlWord");
}
}
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public void myFunction(object sender, RepeaterItemEventArgs e)
{
foreach (RepeaterItem item in rptWord.Items)
{
DropDownList la = (System.Web.UI.WebControls.DropDownList)e.Item.FindControl("ddlWord");
}
}
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