How to get row count of ObjectDataSource

问题

Hello you all

How can i get row count of ObjectDataSouce ?

I use ObjectDataSource and DataList . I want show some thing to the user for example in a label when there are certain row returned by ObjectDataSource . One of situation is when there is no record .

Thank you .

回答1:

I was looking for the same answer... Another solution I ended up using is the following: This is found on a .vb file behind an .aspx page. It handles the "selected" event of the datasource.

Protected Sub ObjectDataSource1_Selected(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs) Handles ObjectDataSource1.Selected
    ' Select data for rowcount
    Dim dt As DataTable = e.ReturnValue
    ' Set row count label
    Me.lblCount.Text = dt.Rows.Count.ToString
End Sub

回答2:

The ObjectDataSource does not have a direct way to get the total row count. One of the reasons for this is that if all you want is the total row count then you don't need the data source at all! To get the row count just talk to your Business Logic Layer (BLL) and get the total rows:

MyBLL bll = new MyBLL();
int customerRowCount = bll.Customers.GetRowCount();

The ObjectDataSource does have a SelectCountMethod that can be used when data bound controls such as the GridView need to access the total row count. However, this is only used while also performing a Select operation. That is, there is no way to only get the row count. The row count is only used so that the data bound control can display a pager control - it is not used for anything else.

回答3:

Found this here:

bool bGetSelectCount;
protected void ObjectDataSource1_Selected(object sender, ObjectDataSourceStatusEventArgs e)
{
    if (bGetSelectCount)
        TextBox1.Text = e.ReturnValue.ToString(); 
}

protected void ObjectDataSource1_Selecting(object sender, ObjectDataSourceSelectingEventArgs e)
{
    bGetSelectCount = e.ExecutingSelectCount;
}

回答4:

You can achieve this very simply using a pager template e.g.

       <asp:DataPager PagedControlID="PagedControlId" PageSize="20" QueryStringField="QueryStringName" ID="InfoPager" runat="server">
           <Fields>
               <asp:TemplatePagerField>
                   <PagerTemplate>
                        Showing results 
                        <%=InfoPager.StartRowIndex + 1 %> 
                        to 
                        <%= (new []{(InfoPager.StartRowIndex + InfoPager.PageSize),InfoPager.TotalRowCount})
                                      .OrderBy(x => x)
                                      .First()%> 
                        of 
                        <%=InfoPager.TotalRowCount %>
                   </PagerTemplate>
               </asp:TemplatePagerField>
           </Fields>
       </asp:DataPager>

This will produce the text "Results x to y of z" including a check for the last page.

Cheers,

回答5:

Protected Sub objItemsList_Selected(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs) Handles objItemsList.Selected
    lblMessage.Text = DirectCast(e.ReturnValue, DataTable).Rows.Count & " record(s) found"
End Sub

回答6:

In my case the ObjectDatasource is a dataset, so I get row number in objectdatasource_selected event like this

e.ReturnValue.tables(0).rows.count.ToString

回答7:

Protected Sub myODS_Selected(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs) Handles myODS.Selected
    Dim s As String = e.ReturnValue.ToString
    Dim rows As Integer
    Int32.TryParse(s, rows)

    'rows variable now holds the total number of results, not just what's displayed on the current gridview page
End Sub

来源：https://stackoverflow.com/questions/1896896/how-to-get-row-count-of-objectdatasource

标签

objectdatasource

rowcount